SwiftUI changes in Xcode 11 Beta 5

SwiftUI iOS beta

New beta 5 just released iOS & iPadOS 13 Beta 5, here are some highlight changes for SwiftUI, you can check the rest here.

TabbedView is deprecated #

TabbedView is now named TabView.

Text now has a default line limit of nil so that it wraps by default. #

The StaticMember protocol is deprecated #

This change affects all presentation style of SwiftUI views.

.textFieldStyle(.plain) to .textFieldStyle(PlainTextFieldStyle())
.pickerStyle(.wheel) to .pickerStyle(WheelPickerStyle())

Environment value isPresented deprecated #

isPresented is change to presentationMode. This EnvironmentValues get injected into a presented view, so you can use this value to dismiss the modal.

struct PresentationLinkExample : View {
@State var show = false

var detail: ModalView {
return ModalView()
}

var body: some View {
VStack {
Button("Present") {
self.show = true
}
}
.sheet(isPresented: $show, content: { ModalView() })
}
}

struct ModalView : View {
@Environment(\.presentationMode) var presentationMode

var body: some View {
VStack {
Text("Modal")
Button("Close") {
self.presentationMode.value.dismiss()
}
}
}
}

SegmentedControl is deprecated #

SegmentedControl now become just one PickerStyle of Picker.

@State var mapChoioce = 0
var settings = ["Map", "Transit", "Satellite"]

var body: some View {
Picker("Options", selection: $mapChoioce) {
ForEach(0 ..< settings.count) { index in
Text(self.settings[index])
.tag(index)
}

}.pickerStyle(SegmentedPickerStyle())
}

Its animation also changed.

Beta 4
SegmentedControl in Beta 4

Beta 5
SegmentedControl in Beta 5

ObjectBinding/BindableObject are deprecated #

@ObjectBinding is become @ObservedObject.

BindableObject protocol is become ObservableObject and willChange become objectWillChange.

final class FooData: BindableObject  {
let willChange = PassthroughSubject<Void, Never>()

var show = false {
willSet {
willChange.send()
}
}
}

struct BindingExample: View {
@ObjectBinding var foo: FooData

var body: some View {
Text("Hello \(foo.show.description)")
}
}

Become

final class FooData: ObservableObject  {
let objectWillChange = PassthroughSubject<Void, Never>()

var show = false {
willSet {
objectWillChange.send()
}
}
}

struct BindingExample: View {
@ObservedObject var foo: FooData

var body: some View {
Text("Hello \(foo.show.description)")
}
}

There is also new magic in property wrapper @Published where it automatically synthesize the objectWillChange publisher and call it on willSet.

So we can make it shorter with this.

final class FooData: ObservableObject  {
@Published var show = false
}

struct BindingExample: View {
@ObservedObject var foo: FooData

var body: some View {
Text("Hello \(foo.show.description)")
}
}

Core Data and Combine integration improvements #

  • NSManagedObject now conforms to ObservableObject.
  • The new @FetchRequest property wrapper can drive views from the results of a fetch request.
  • managedObjectContext is now included in the environment.

References #

You can check out my compiled cheat sheet at fuckingswiftui.com or goshdarnswiftui.com if you want more work-friendly.


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