Articles

Learn how to do that using the Swift Algorithms module and without it.

Learn what Safe area insets are and how to utilize it.

Learn how to have custom logic for a navigation view back button.

We can create a view controller that represents a SwiftUI view by subclassing a UIHostingController. Let's learn how to do it.

Let's learn how easy it is to pop or dismiss a view from a NavigationStack, a new navigation view in iOS 16.

Learn how to use SwiftUI view as a UIViewController in a UIKit project that uses a Storyboard.

Having both background and border in SwiftUI isn't straightforward. Let's learn how to do it.

If you create a new SwiftUI project, you will no longer see Info.plist file. Let's learn about this change.

The guard-case is a syntax to allow us to precondition check for one specific enum case.

Learn how to use a SwiftUI view as a UIView in a UIKit project.

Learn how to hide a navigation bar in SwiftUI.

Learn the difference between a launch screen and a splash screen in iOS.

Learn how to disable a SwiftUI button.

Learn how to store an array in UserDefaults.

We can use SwiftUI view in UIKit by wrapping it in UIViewController. Let's learn how to do it.

The onMove modifier enables item reordering on every row. Let's learn how to disable this on particular rows.

Learn how to test for unwrapped optional values in a switch statement.

Learn how to change the background color of a SwiftUI Button.

Learn how to turn ["John", "Alice", "Bob"] into "John, Alice, Bob".

The onDelete modifier enables item deletion on every row. Let's learn how to disable this on particular rows.

Learn four different ways to initialize final variables in Dart.

Learn how to control the size of a button in SwiftUI.

Learn two ways to check if an array contains a given element.

Learn how to Remove unused imports and Sort import packages by their name.

Learn how to remove the bottom separator in any List view.

There are two kinds of properties in Swift, Stored, and computed. Let's learn the difference.

Learn how to make Swift Enum become Identifiable.

#available and @available are features related to the availability of APIs. They are tools that mean to use together. Let's learn the difference and when to use them.

Learn how to enable/disable the reorder ability in SwiftUI List.

There might be several reasons that cause this error. I will share the solution that works for me.

Learn what it is and how it affects a button.

If you need a string that spans several lines, Swift has a multiline string literal that you can use.

Learn how to change a status bar text color in SwiftUI.

Learn how to enable/disable the delete ability in SwiftUI List.

Learn how to match a single case of an enum with an if-case syntax.

In this article, I will show you all 5 button styles you can use with SwiftUI Button in iOS.

There might be several reasons that cause this error. I will share the solution that works for me.

Learn how to create a list from a collection of data.

Learn how to style some parts of SwiftUI Text view.

Two common reasons make the preferredStatusBarStyle not getting called.

Learn how to colorize a list section separator.

Some list style has section separators. Let's learn how to remove them.

Learn how to allow multiple row selection in SwiftUI List.

SwiftUI made it incredibly easy to create a button compared to how we do it in UIKit. Let's learn how to do it.

Learn how to make all subviews in HStack have an equal height.

A list view doesn't support horizontal scrolling, but we can fake it using ScrollView and LazyHStack. Let's learn how to do it.

When you use a custom font in your iOS app, the font name that you use to initialize UIFont or Font isn't the file name.

Learn how to add list row selection in SwiftUI List.

Learn how to change a status bar text color in UIKit app.

It is very common to populate a list view from an array of data. Let's learn how to do it in SwiftUI.

SwiftUI has many ways to dismiss a modal view based on how you structure your view and the minimum iOS version you support.

Learn how to use a custom font in your SwiftUI app.

Even though ForEach and List have similar syntax, they serve different purposes. Let's learn about their differences.

Is it OK to manually initialize @StateObject? Let's find out.

Learn how to initialize a state variable and discuss whether you should do it or not.

Learn how to colorize a list row separator.

By default, if an iOS app gets a notification while the app is in the Foreground, the notification banner won't show up. Since iOS 10, you can change this behavior. Let's learn how to do it.

A curated list of websites which you can find a free font for your iOS app.

In iOS 15, we can remove a List row separator. Let's learn how to do it.

You can use ForEach inside a List view in SwiftUI, but when should we use it? Let's learn in which cases we should use ForEach.

In iOS 16, SwiftUI finally got a new modifier to disable scrolling in ScrolView and List.

Learn how to add and remove a badge on List rows.

By default, the selected tab bar item will use the iOS default blue color. Let's learn how to change this in SwiftUI.

Learn how to upload a dSYM file to Firebase with Fastlane.

An accent color is a simple and unified way to theming your app. This article will teach you how to set a global accent color for your app.

Dynamic Type automatically scales a font size according to Accessibility settings. In iOS 14, we also have a way to scale numeric values like padding and margin.

You can no longer download dSYM from the App Store Connect.

Let's learn the easiest way to create a list in SwiftUI.

Most of those styles use uppercase text for the section header. In this article, we will learn how to opt-out of this behavior.

In iOS 16, we can adjust a List row separator insets with the new alignment, listRowSeparatorLeading.

Learn how to filter out nil values from a Swift array.

In iOS 16, SwiftUI got a way to change the bottom tab bar background color with the new modifier, toolbarBackground.

Learn how to add and remove a badge on Tab Bars.

In this article, I will show you all 6 list styles you can use with SwiftUI List view in iOS.

SwiftUI has many ways to dismiss a sheet view based on how you structure your view and the minimum iOS version you support.

Learn how to make your custom font scale automatically like the system one.

You can easily add keyboard shortcuts to Mac, iPhone, and iPad with the keyboardShortcut modifier.

In Xcode 14.1, SwiftUI finally got new APIs to set the font width.

There are many ways to create a rounded corners button in SwiftUI. Let's learn how to do it.

Learn how to use UIView as a SwiftUI view.

There are many ways to create a rounded corners button in UIKit based on the minimum iOS version you want to support. Let's learn how to do it.

Learn different ways to check if a string is a number.

Learn how to simulate the viewDidLoad() behavior in SwiftUI using the onAppear modifier.

When creating an app, there is a time when you want to create a repetitive view or a collection of views from an array of data. We can do that in SwiftUI with ForEach.

Swift has many ways to retrieve an index of an array, but it might not be obvious. Let's learn how to do it.

zIndex is a modifier that controls the display order of overlapping views in SwiftUI. Let's learn how it works.

Learn how to make whitespace characters visible in the Xcode editor and why we need them.

SwiftUI made it incredibly easy to create a list or table view compared to how we do it in UIKit. Let's learn how to use it.

Learn how to use UIViewController as a SwiftUI view.

Learn how to add navigation bar buttons in SwiftUI.

In iOS 16, Apple introduces three new width styles to the SF font family. Let's see what they look like and how to use them.

Learn how to convert UIKit UIFont to SwiftUI Font.

SwiftUI got many beautiful built-in button styles. One problem you might get is it isn't obvious how to control the size of it. Let's learn how to do it.

There are many ways to loop in Swift. In this post, I will show you how I do when I want to loop for a specific number of times.

In iOS 16, SwiftUI got a new tool, AnyLayout, that makes it possible to transition between layouts while maintaining the identity of the views.

Learn how to uppercase to only the first letter of a word and sentence.

iOS 16 brings a new view to SwiftUI, Gauge. Let's see what it is and how to use it.

Let's learn how to read/write enum with associated value to UserDefaults.

If you have a layout that the built-in layout like VStack and HStack can't serve, you can create a custom one in iOS 16. Let's learn how to do it.

Enumeration is a type that I think is perfect for representing options for users, but we can't save it directly to UserDefaults. Let's learn how to read/write enum to UserDefaults.

Making SwiftUI views responsive usually involves a lot of GeometryReaders and if-else. In iOS 16, SwiftUI got a new view that makes it easier. Let's learn how to do it.

When you read SwiftUI tutorials, you might stumble on the fixedSize() modifier. Let's see what it is and why we need it.

A navigation bar is an essential part of iOS apps. It is a part where we usually apply color to match our branding. In iOS 16, we can customize a navigation bar purely in SwiftUI.

A tip to prevent error and improve readability when dealing with numbers.

Sometimes I forget to create a new branch for a new feature and commit changes directly to the develop branch. Let's learn one way to correct this mistake in git.

Variable Color is a new feature of SF Symbols that allows you to change the appearance of a symbol based on a percentage value. Let's learn what it is and how to use it.

In iOS, we have dedicated built-in ways to dismiss the keyboard in scrollable content. Let's learn how to set that in SwiftUI.

In iOS 16, we got a native way to present a bottom sheet in SwiftUI. Let's explore its behavior and limitation.

In iOS 16, we got a big improvement over lineLimit modifiers. Let's see what we can do with it.

In iOS 16, Apple allows users to grant or deny pasteboard reading permission before it happens. Let's see what that means to users.

In iOS 16, the URL got a whole pack of type properties that reference a different path within a user domain, e.g., URL.documentsDirectory.

In iOS 16, we finally got a native way to change the background color of a list view in SwiftUI.

Swift 5.7 introduced a new syntax for optional binding. Let's see what it is and how it can improve our code.

In SwiftUI, we have no direct way to change a status bar style. But we can indirectly control it through two view modifiers.

If your Apple account belongs to multiple teams, this can cause Fastlane confusion. Learn how to fix it.

In iOS 16, we have a new view to select multiple dates. Let's explore its capabilities.

In iOS 16, we can create a multiple text field with new initializers and a little help from the .lineLimit(_:) modifier.

In iOS 16, we can create a mac menu bar app without a need for AppKit. Let's learn how to do that.

iOS 16 add a new Grid view to SwiftUI. A Grid view arranges child views in rows and columns. This table-like structure makes a layout that is hard to do in vertical and horizontal stacks become easier.

Initialize instance variable is not as straightforward as you think. Let's learn how to do it.

iOS 16 add the ability to integrate a text field in an alert.

Small improvements that make a big difference in day-to-day coding.

An overview of what's new in SwiftUI.

Learn a dedicated modifier to change a list row background color in SwiftUI.

Learn the difference between a horizontal and vertical grid and everything you need to know to use them.

Dart has a special syntax for a constructor to initialize all instance variables. It is convenient but also confusing for a newcomer. Let's learn what it is and how to use it.

Learn three ways to declare parameters for a Dart function.

This article will share seven Xcode shortcuts that will help you on a large iOS project. The tricks you are about to learn will help you find and navigate to a file/class/symbol in your large and small project.

We can group related data in a SwiftUI list using Section view. We can also optionally add a header and footer to describe a particular section. Let's learn how to do that.

SwiftUI Divider has some limitations, but you can overcome that with modifiers. Let's explore its limitation and capability.

Learn how to set font size, design, weight, and color in SwiftUI.

In this tutorial, we will learn how to create a circular progress bar in SwiftUI using just three SwiftUI views.

There are two ways to set a font size for Text view in SwiftUI. Let's see what they are and how to set them.

At the beginning of a project, there are a lot of changes and uncertainty. You might want to start modularizing your code in the later phase, where the scope is clearer. Let's see how to prepare your single module project to support future modularizing.

The available attribute (@available) is another tool that helps you cope with API changes. Let's see how this is different from the availability condition (#available).

Learn how to make derived variables observable in GetX.

Every year Apple introduces new features to the system, and sometimes they have to deprecate some old APIs to make room for the new ones. Change is an inevitable thing in programming. Let's learn how to handle the changes.

Many things can go wrong when you write an asynchronous function in Dart. Let's learn how to use Future, async, and await properly.

Type placeholders allow us to write a type placeholder (_) in a place where type is expected. A compiler will automatically infer the type of that placeholder. But what is the benefit of it? Let's find out.

I couldn't initiate IntelliSense for a long time because I couldn't find any Keyboard shortcuts for "IntelliSense". If you are in the same situation, I have a solution for you.

We have no way to set the minimum lines of Text in SwiftUI, but you can have that with this bit of hack.

There might be several reasons that cause this error. I will share the solution that works for me.

A type alias declaration introduces a named alias of an existing type into your app. You can think of it as defining a nickname for an existing type. Let's learn the benefit and when to use them.

If you use Proxyman with a Flutter app, you might not see any traffic from your Flutter Project. Here is how to fix it.

Modular programming is a software design technique that breaks your project into a smaller maintainable module which promotes separation of concern and reusability. Let's see how easy it is to modularize an iOS app with Swift Package.

As your team and project grow, you might need to enforce some coding rules to make your code go the same direction. Luckily, adding custom lint rules in Flutter is very easy. Let's learn how to do it.

Learn how to use a launch argument to override UserDefaults value and test your apps.

Learn what launch configuration is and how to use it.

Not every website got a search function. If you found an interesting site and want to explore more topics within that site, you can do it with the help of a search engine of your choice.

A transparent navigation bar is quite popular among the design community. It is just a matter of time before you have to do it. We will explore different ways to do that in this article.

In iOS, we can control a button enabled/disabled state by setting an isEnabled property. In Flutter, you won't find such attributes. Let's learn how to do it.

Find out where we can get information about the iOS version market share.

Reset push notification permission on macOS isn't as straightforward as how we do it on iOS. Let's see how to do it.

When you run a Flutter app for the first time, you probably notice a debug banner in the upper right of the screen. Learn what it is and how to remove it.

If you prefer to review pull requests with an editor but hate the clone or checkout process, you can enjoy the review process without the hassle with new github.dev web-based editor.

Learn how to apply gradient colors to a SwiftUI text view.

Learn how to parse ISO 8601 date with ISO8601DateFormatter.

Learn how to make notification permission dialog popup again like the first time you run the app.

A guideline on how to embrace a label in your custom view.

Learn how to make hexagon-shaped profile pictures in SwiftUI.

Align text within a container view in SwiftUI isn't a straightforward operation as you might think. Let's learn how to do it.

Each language has its own characteristic. Some are more verbose than others. Some have special characters that take up vertical spaces. Some even read and lay out from right to left. Let's see how to make sure your layout is ready for this.

Learn what we can customize when relying on automatic synthesizing Codable for enums with associated values.

A tip for creating multiple schemes to quickly run your app in different languages.

A label might seem trivial, but it plays an important role in SwiftUI. Let's learn about this simple view.

A look back at 2021.

Swift 5.5 extends the support for the automatic synthesis to enums with associated values. Learn what can be expected from the synthesis code.

Xcode has a feature to generate code coverage since version 7. Let's see how to enable it and what you can expect from this feature.

Learn different ways to color an UIImage in Swift.

Learn how to write custom XCTest assertions that match the behavior of the built-in ones.

When using an image in iOS, you have an opportunity to control how you want the image to be rendered. Most of the time, you don't need to care about this, but when images do not render the way you want, make sure you know how to customize them.

iOS introduces a new concept to SF Symbols, SymbolVariants. Let's see how this improves the way we interact with symbols.

Learn how to make a case insensitive enum.

If you are not ready to make your app support dark mode, you can opt-out of that. You can do disable it for an entire app or partially. Learn different ways to disable dark mode in iOS.

When you start a new project, you would see either of these attributes in an AppDelegate file. Let's find out its functionality.

By default, when you set an image to an UIButton, it will position on the leading edge of the text. Let's learn how to put it on the trailing edge instead.

Let's learn how to make a simple menu bar app in this article.

Initializing an NSViewController without nib isn't straightforward as UIViewController. Trying to do so would result in a runtime error. Let's learn how to do that.

There is no way to add a custom font for each language. Luckily, we can indirectly set that with fallback fonts. Let's learn how to do it.

Learn how to use local custom fonts that bundle with your application in WKWebView. It isn't hard, but not very obvious how to do it.

macOS is tightly coupled with storyboard and xib than iOS. To build your UI entirely in code, we have to do some initial setup.

Both Xcode and Simulator can simulate location, but they serve different purposes. The Simulator provided a quick and easy way to simulate location and movement. On the other hand, Xcode offers more customization. Let's learn the differences so you can pick the right tool for your needs.

In iOS, you can add and use a custom font to your app and use it like other assets. The process is not hard, but it might not be straightforward as adding an image. Let's learn how to do it.

When you convert HTML string to NSAttributedString, sometimes, you will get an extra unwanted bottom padding. Learn what is causing this and how to mitigate the problem.

We can use a frame modifier to make a view appear to be full width and height, but the result might not be what you expected.

In Swift 5.5, we can apply button style using leading dot syntax, .buttonStyle(.plain), instead of a full name of a concreate type, .buttonStyle(PlainButtonStyle()). Let's see how we can make our custom button style support this.

By learning about the key path, you open up yourself to an opportunity to improve your existing API or even create a new one that you don't aware you can do it.

Every switch statement has a default case. Every do-catch statement has a catch clause. Should every if statement has an else clause?

Learn the difference between all-new alert APIs in iOS 15.

?? is an operator that has one specific use case. Let's find out what it is.

In iOS 15, we finally have native UI for a bottom sheet. Let's explore its behavior and limitation.

There are many ways we can satisfy a closure argument. Some of them do not even look like closure. Let's learn all of them in this article.

Learn how to create an outline button style.

The thing you should know before using the convertFromSnakeCase decoding strategy.

It might not be obvious that we can create a custom environment value, but we can do that. The steps to create one are not as straightforward as we usually do, but it isn't hard if you know how to do it.

Trying to reference two methods with the same name and parameters will cause an ambiguous compile error. Learn how to resolve it.

If you have ever worked with an app with multiple alerts, please beware that the system can present only the latest or outermost one. Let's see how we can mitigate this.

Learn how to show an alert (UIAlertController) in SwiftUI.

Learn how to add a print() in a SwiftUI view.

Learn how to create macOS pop-up buttons in SwiftUI.

It is tempting to just catch all a throwing error in a single catch clause and call it a day, but not all errors are created equals, and you should treat it as such.

Learn how to make UIScrollView, UITableView, and UICollectionView ignore safe area insets and put their content behind that navigation bar.

Did you know that you have an option to enable spell checking in Xcode?

Learn a workaround to specify a type for your generic functions.

Once the sidebar is collapsed, there is no way to get it back. Learn how to mitigate the situation.

Learn how to change button configuration, e.g., title and color, based on the internal and external changes.

In UISearchController, we can set search bar hiding behavior with hidesSearchBarWhenScrolling property. But how to control this behavior isn't obvious in SwiftUI. Learn how to control search bar hiding behavior in SwiftUI.

Working on your MacBook without an external monitor can be troublesome due to the small screen size. I will show you 4 Xcode shortcuts that might mitigate the situation.

The idea that you can use one codebase for multiple platforms and cut development time by half is tempting, but what do you trade for this time saved?

SwiftUI finally got native search support in iOS 15. We can add search functionality to any navigation view with the new searchable modifier. Let's explore its capability and limitation.

Learn how to import .cer and p12 to Fastlane match without nuke or creating a new one.

We have a new way to format data into a localized string in iOS 15. Why do we need another formatter? How does it differ from the old one? Let's find out.

Learn how to create, export, and import certificate without any third-party tools.

Asking for sensitive data like location is hard. Learn how Apple makes it easier with the new Location Button.

New in iOS 15, SwiftUI has finally support preview in landscape orientation. Let's find out how to do it.

Each Xcode version comes with a specific Swift toolchain. If you want to prepare your app for a new feature and make it work with CI, you want to make your tools, e.g., Fastlane and xcodebuild know about the new toolchain. Let's see how we can switch between different Swift toolchains with command-line tools.

The first part in the series "What's new in UIKit button". An introduction to a new button configuration, a struct that is shaping and styling your button. You no longer need to subclass UIButton ever again with button configuration.

Each Xcode version comes with a specific Swift toolchain, but you don't have to wait for a new Xcode version to try the new Swift features. Let's see how we can switch between different Swift toolchains in Xcode.

SwiftUI got a native way to add UIRefreshControl in iOS 15. Let's find out how to add it in the list view and even your custom view.

Learn different ways to change status bar text color in Flutter.

Learn different ways to change the back button color in Flutter.

Learn how to make a transparent app bar in Flutter.

Learn an easy way to read the information in Info.plist.

Learn how to create a separate environment for your app with the help of Configuration and Scheme. Create a different app and variables for each environment on the same codebase.

We can make a simple bevel effect using two inner shadows. SwiftUI has a built-in way to add a drop shadow with the shadow modifier. But if you want to add an inner shadow effect, you need to be a bit creative.

As the name implies, a property wrapper is a new type that wraps a property to add additional logic. Let's see what it capable of and the benefit it provided.

Leaning tips and tricks about the tool will help you down the road. Today, I will show you 4 Xcode shortcuts that I find helpful when dealing with SwiftUI.

Setting background color in SwiftUI is not as straightforward as UIKit. Let's learn how to do it.

Learn how to fit an image view to any container.

In UIKit, we have various ways to control an image's position and behavior in UIImageView with a help contentMode property. In SwiftUI, we only have fit and fill content mode. Let's see how we can replicate the rest.

Learn how hard or easy it is to add a background view in SwiftUI.

SwiftUI doesn't have a built-in way to preview for a device in landscape orientation at the moment, but we can simulate that with a few modifiers.

Find out what is the SwiftUI way of styling portions of text.

Learn thirteen ways to position and resize UIImage in UIImageView.

@StateObject is an essential property wrapper in SwiftUI, but I found the way to initialize them is not obvious.

A brief summary of init and scaffold commands.

Learn how to use aspect fit and aspect fill content mode to fit your image to its bounds.

Learn how the scaffold command helps you to bootstrap new components or features such as a new VIPER module or a new framework for your new feature.

Show and hide transition animation in ZStack can be glitchy. Learn how to fix it with a simple trick.

Learn how to use, and limitations of tuist init, a command that bootstrap a new project.

The template is a way to group repetitive code structure into a reusable component. You will learn how to create them in this article.

Apple announced the App Store Connect API back in WWDC18. It provides an official way to interact with App Store Connect, and Fastlane already supports this. With a recent 2FA enforcement from Apple, it is time for you to adopt it.

There might be several reasons that cause this error. I will share one that just happened to me.

Learn how tuple can help you in sorting.

Learn the way to create the UISegmentedControl equivalent in SwiftUI.

We will see how hard (or easy) it is to add a new unit testing bundle target to your Xcode project with Tuist.

In iOS, if you want to delete the app's UserDefaults, you can simply delete the app. But that is not the case for macOS and Catalyst app.

Learn how to use Picker, a UIPickerView equivalent for SwiftUI.

An easy question that you might overlook. Learn this simple fact together in this article.

Xcode 12.5 brings many great updates and features. One of them is the ability to record a video of the app directly from the Simulator app.

Part 4 in the series "Building Lists and Navigation in SwiftUI". We will explore a NavigationView, UINavigationController equivalent in SwiftUI.

A brief introduction to Tuist, a command-line tool that helps you generate Xcode projects.

Learn how to fit image view to any container by changing Content Hugging Priority and Content Resistance Priority.

Learn how to sort an array of objects with multiple criteria.

Part 3 in the series "Building Lists and Navigation in SwiftUI". We will explore a List, UITableView equivalent in SwiftUI.

Learn how to overload existing operators such as +, -, *, / or create a custom one (such as .^.).

Part 2 in the series "Building Lists and Navigation in SwiftUI". We will explore a ScrollView, UIScrollView equivalent in SwiftUI.

Learn how SwiftUI shares application settings and preference values across the app.

Part 1 in the series "Building Lists and Navigation in SwiftUI". We visit the first building block of any list view, content, and how to create them.

Learn how to check if a string contains another string, numbers, uppercased/lowercased string, or special characters.

String comparison is an essential operation for day to day job. Swift provides a few variations for this. We will visit them in this article.

How to create and use TextField in SwiftUI.

SF symbols are icon sets that Apple design to work with their system font. Learn how to change its color and how to show them in multicolor style.

There might be several reasons that cause this error. Here are the solutions that fix it for me.

Learn to convert a string "123" to an integer 123.

A look back at 2020.

Learn a proper way to sort an array of strings in each circumstance.

Learn how to format a Float and Double string.

Learn how to use this expensive DateFormatter.

Learn different ways of using for loop for each scenario.

There might be several reasons that cause this error. I will share one solution that fixes the one that happened to me the most.

If you are working on iOS for long enough, there is a chance that you might have known that DateFormatter is expensive, but what is costly about DateFormatter? Let's find out in this article.

Learn a few ways to do it and things you should know when using them.

Learn how to add padding to your stack view's content.

Learn a lesser-known API to create a custom UIStackView spacing without nested them together.

Font is an essential part of an app. A good selection of font would make your app stand out from the crowd. But whatever fonts you choose, you have to make sure it doesn't lose its core function, readability. You might feel reluctant to use a custom font in the past because you might lose the benefit of dynamic type goodness that Apple provides with their system font. Since iOS 11, this is no longer the case. You can easily use your custom font dynamic type.

It is a hidden gem in Xcode that can save up your coding time. Learn what it is, how to use it, and some use cases.

There are a few variations when dealing with counting days. You need to ask yourself some questions beforehand.

Date and time might be among your list of the hardest things in programming (It is for me). Today, I'm going to talk about a basic concept of a Date and its companion DateComponents.

Learn the meaning of @escaping, so you know what to do when you see it or when you need to write one.

Print debugging is the simplest form of debugging technique, but it possesses some drawbacks. Let's see how we can make it better by using Xcode breakpoints.

Equatable and Hashable are two essential protocols in the Swift world. Let's learn an old Swift feature that you might forget.

NSUserDefaults is a go-to database for saving users' preferences. Learn how to populate it with your default values.

Learn how to lets users save an image outside of your app’s sandbox.

Three language features around Swift enumeration that you might not aware of.

Learn how to write unit tests for delegate/protocol methods.

SwiftUI provides an easy way to convert to render any view into a placeholder style by redacting its content.

SwiftUI's UIPanGestureRecognizer equivalent.

In the past, the way I test a custom URL scheme is to go to Safari and open up any of my custom URLs. If you are still doing that, there is a better alternative.

Fastlane Match saves us a lot of time managing certificates and provisioning profiles, but there is one thing that we have to do it manually. That is a renewal expired certificate. Luckily, we have to do it once a year. Let's learn how to do it.

In iOS 14, we have a new way to put images along with texts.

Learn how to create protocols that constrain their conforming types to a given class.

Apple adds a new way to control where the back button will pick up its title. Let's see how this make thing a lot easier going forward.

We finally get SVG supported and the best thing is it is backward compatible with some limitations.

In iOS 14, long-press on the back button will bring up a history stack. Learn what you should consider with this new behavior.

SKOverlay is a new tool from Apple for doing apps cross-promotion.

In iOS 14, we finally have a way to set a toolbar for a view in a navigation view.

Learn how to set a navigation bar title view in SwiftUI.

This modifier can interpolate position and size between two views. This is one of the most exciting features for me. Let's see what is capable of in this beta.

The most popular question since the introduction of SwiftUI. Here is my thought after WWDC20.

A new way to create a reusable view.

How to create a reusable toggle style in SwiftUI.

A view controller is one component where memory leak usually takes place since it holds many pieces together. One of the easiest ways to detect them is to see if a view controller is not being deallocated. Let's see how Xcode breakpoint can help you find a leak.

I can't tell it is a stupid or genius algorithm, but it sure got a beauty in it.

Explore how delay and repeatForever affect an animation.

Learn the proper way of getting user information.

To set a custom image for the back button, we need to set an image to both backIndicatorImage and backIndicatorTransitionMaskImage, but what does backIndicatorTransitionMaskImage really mean?

Learn how to change a UINavigationBar back button indicator.

Learn how UIStackView can help to make your UI adapt to size change.

Learn how to set shadow spread and blur from a Sketch design.

Learn how to get a suffix from a Swift string.

When working with an unstable, legacy, or third party API, you might get a malformed object in an array. Learn how to decode a JSON array with corrupted data in Codable safely.

Learn to round specific corners, e.g., top-left and top-right.

Learn different ways to control the status bar style.

Learn how to get a prefix from a Swift string.

Learn how to check your app version strings are higher or lower.

Learn different ways to split a string into an array of substrings.

The default appearance of UIButton is a single line text, but it also supports a multi-line text with some minor tweak.

Learn different ways to define Auto Layout constraints programmatically.

A tip to declare a custom initializer without losing a memberwise initializer.

Struct is one of the basic building blocks in your app. Today I'm going to share some tips about memberwise Initializers.

When you work with an API, there would be a time when your backend wants to control a text style, and HTML is the most common format for the job. Do you know that WKWebView is not the only way to present HTML string? Learn how to render it in UILabel and UITextView.

There are a lot of hacky ways to modify or remove a back button title. This tip will show you how to do it properly.

Testing is a process we do along with our development. Knowing shortcuts would help you save some time, which will add up in the long run.

We will talk about accentColor, a tintColor equivalent in SwiftUI.

Introduce you to one of an essential part of iOS theming. What is tintColor and its benefit.

How to create a reusable button style in SwiftUI.

Introduction of SF Symbols, learn the basics, and how to use them.

Create a reusable boilerplate snippet that you can use in the project.

If you are still declaring class-only protocols by inheriting them from class, you might need to revise your knowledge.

Neumorphism or Neomorphism is a new design trend of UI recently. We are going to see how to implement this in SwiftUI.

Swift Package Manager is getting better every day. It is a matter of time before everyone supports it. When the time comes, make sure you know how to say goodbye to this old friend.

When I want to keep some information or configuration out of a code base and don't want something fancy, I usually save it as Property List file. Let's see how to do it.

Modify AppDelegate or SceneDelegate to support a non-storyboard approach.

A guide to creating an activity-ring-like circular progress bar in SwiftUI. An in-depth tutorial of what I think when making a custom view. At the end of this article, you will be able to create the Activity ring used in the Activity app on Apple Watch.

A new and easier way to test Apple push notification on iOS simulator.

SwiftUI has built-in ways to apply gradient color to its view. We are going to explore all three types of gradients provided, LinearGradient, RadialGradient, and AngularGradient.

Most complex custom views can be made by composing many basic shapes together. Today we will learn basic operations that we can do with them. It may seem trivial, but knowing these basics will benefit you in the future.

How to define intrinsic content size in SwiftUI

Part forth in a series Sign in with Apple. Use Sign in with Apple JS to let users set up accounts and sign in to your website and apps on other platforms.

How to print object (po) in a debugger (lldb) without escape special characters.

Part 3 in a series Sign in with Apple. In this part, we will see how backend can use the token to sign up/sign in users.

How to make .insetGrouped UITableView style in SwiftUI List

Learn about this Swift attribute and its purpose.

Part 2 in a series Sign in with Apple. In this part, we will talk about the anonymous email address. How to make it work and its limitation.

Explore how to animate changes in SwiftUI.

Part 1 in a series Sign in with Apple. In the first part, we will focus on the app part. What we need to do to add Sign in with Apple option in our app.

A guide to decode a gibberish crash report to a human readable format.

How to write documentation comments in your Swift code.

No more manual if let and guard let in your tests.

If this is just a comment for you, this article might benefit you.

How to cache Pods, Ruby gem, and Carthage in your iOS project.

A cheat sheet that tells you what colors to use to support dark mode. This is a guide for those who want to adopt dark mode, but too lazy to figure out which color to use.

How to setup ci for iOS projects with Github Actions.

Learn how you should write a code that shows your true intention.

Things you should know about color when adopting dark mode.

Learn how to do all of this without any external tools.

Revisit of navigation bar appearance — this time with a UISearchController. If you have a search bar in your navigation bar, you might need to recheck when you build your app against iOS13.

The last part in a series on understanding data in SwiftUI. See all tools SwiftUI provided to declare different types of data and dependency. Learn when and how to use @State, @Binding, ObservableObject, @ObservedObject, @EnvironmentObject, and @Environment.

Part 2 in a series on understanding data in SwiftUI. We will talk about the key that makes principles in part 1 possible in SwiftUI. And how this resulting in a reduction of the complexity of UI development.

Part 1 in a series on understanding data in SwiftUI. In the first part, we will try to understand the importance of data and how they play an essential role in SwiftUI.

Make sure your refresh control working on iOS 13.

Required modifications to make your newly created project work in iOS 12 or lower.

Apple brings a lot of appearance changes in iOS13, and the navigation bar is one of them. Cover everything you should know once you build your app against iOS13 (Xcode11).

A long-awaited feature has finally come to iOS. Join it or not is your choice to make. This article will guide you through it.

In iOS13, the modal presentation gets a new look and dismissal gesture. This article will talk about what you can do with these new welcoming changes.

Learn how to create a custom subclass of UIHostingController and its benefit.

Learn a crucial concept in SwiftUI, view modifier, and a guide of how to create your custom modifier.

Highlight changes for SwiftUI in beta 5

Using SwiftUI as UIView and UIViewController

Highlight changes for SwiftUI in beta 4

Say goodbye to optional properties in your view controllers. In iOS13, you can inject those properties at a time of view controller creation.

WWDC session shows us a way to create UISplitViewController with NavigationView in SwiftUI. It finally works in Xcode 11 Beta 3.

Highlight changes for SwiftUI in beta 3

Using UIView and UIViewController in SwiftUI

SF Symbols contain over 1,500 icons. It would be hard if you don't know the existence of SF Symbols App.

Where is UIViewController in SwiftUI?

iOS flow controller

Swift Codable

Can it replace JSON encode/decode lib out there?

A missing Objective-C piece