How to change SwiftUI Button Size

There are two ways we can control a button size.

1. Using .controlSize modifier
2. Manually customize the label

How to change a button size using .controlSize modifier

You can change the size of a SwiftUI Button by using controlSize(_:).

There are four sizes to choose from

1. mini
2. small
3. regular (This is default size)
4. large

Here is an example of a large bordered prominent style button.

Button("Large Button") {
            
}
.buttonStyle(.borderedProminent)
.controlSize(.large)

The control size can affect many aspects of a button. As you can see in the following example, it can affect padding, text size, and corner radius.

You might see that there is no noticeable different between the mini and small control sizes. ControlSize just convey our intention, but it is up to SwiftUI to decide how it looks depending on the context.

The following example is the different control sizes on macOS. As you can see, the mini size is smaller than small on this platform.

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How to change a button size manually

Using controlSize is a quick and easy way to control the size of a button.

But as you see, you are giving up control to SwiftUI. If you want more control over the size you have to do it in a button label.

I usually use padding and frame to control the size of a button. But you can use anything you can think of. The label size determines the button size.

Here is an example where we control button sizes using .padding and .frame.

VStack {
    Button {
        
    } label: {
        Text("Custom Button")
            .padding(.horizontal, 20)
            .padding(.vertical, 8)
            .foregroundColor(.white)
            .background(.pink)
            .cornerRadius(8)
    }    
    
    Button {
        
    } label: {
        Text("Custom Button")
            .padding(.horizontal, 8)
            .frame(height: 44)
            .foregroundColor(.white)
            .background(.pink)
            .cornerRadius(8)
    }    
}

Caveat

Normally, button size and tappable area are determined by the button content, but that is not entirely true.

Some button styles might decide to override that. One example is the .bordered button style on macOS.

If you run the code in the previous section on macOS, this is what you will get.

As you see, the button's height is overridden by the .bordered button style (The default style for macOS).

To fix this, you have to opt out of the problematic style. You can create your own style or use .plain button style.

VStack {
    Button {
        
    } label: {
        Text("Custom Button")
            .padding(.horizontal, 20)
            .padding(.vertical, 8)
            .foregroundColor(.white)
            .background(.pink)
            .cornerRadius(8)
    }
    .buttonStyle(.plain)
    
    Button {
        
    } label: {
        Text("Custom Button")
            .padding(.horizontal, 8)
            .frame(height: 44)
            .foregroundColor(.white)
            .background(.pink)
            .cornerRadius(8)
    }
    .buttonStyle(.plain)
}