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How to create a tappable button

Paul Hudson    @twostraws   

Fully updated for Xcode 11.2

SwiftUI’s button is similar to UIButton, except it’s more flexible in terms of what content it shows and it uses a closure for its action rather than the old target/action system.

To create a button you would start with code like this:

Button(action: {
    // your action here
}) {
    Text("Button title")
}

For example, you might make a button that shows or hides some detail text when it’s tapped:

struct ContentView: View {
    @State private var showDetails = false

    var body: some View {
        VStack {
            Button(action: {
                self.showDetails.toggle()
            }) {
                Text("Show details")
            }

            if showDetails {
                Text("You should follow me on Twitter: @twostraws")
                    .font(.largeTitle)
            }
        }
    }
}

Tip: The classic thing to do when you’re learning a framework is to scatter print() calls around so you can see when things happen. If you want to try that with your button action, you should first right-click on the play button in the preview canvas and choose “Debug Preview” so that your print() calls work.

The title inside the button can be any kind of view, so you can create an image button like this:

Button(action: {
    self.showDetails.toggle()
}) {
    Image("example-image")
}

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