I stumbled upon a weird behaviour for Button
s in SwiftUI in combination with a custom ButtonStyle
.
My target was to create a custom ButtonStyle
with some kind of 'push-back animation'. I used the following setup for this:
struct CustomButton<Content: View>: View {
private let content: () -> Content
init(content: @escaping () -> Content) {
self.content = content
}
var body: some View {
VStack {
Button(action: { ... }) {
content()
}
.buttonStyle(PushBackButtonStyle(pushBackScale: 0.9))
}
}
}
private struct PushBackButtonStyle: ButtonStyle {
let pushBackScale: CGFloat
func makeBody(configuration: Self.Configuration) -> some View {
configuration
.label
.scaleEffect(configuration.isPressed ? pushBackScale : 1.0)
}
}
// Preview
struct Playground_Previews: PreviewProvider {
static var previews: some View {
CustomButton {
VStack(spacing: 10) {
HStack {
Text("Button Text").background(Color.orange)
}
Divider()
HStack {
Text("Detail Text").background(Color.orange)
}
}
}
.background(Color.red)
}
}
When I now try to touch on this button outside of the Text
view, nothing will happen. No animation will be visible and the action block will not be called.
What I found out so far:
.buttonStyle(...)
it does work as expected (no custom animation of course).background(Color.red))
on the VStack
in the CustomButton
it does also work as expected in combination with the .buttonStyle(...)
The question now is if anybody have a better idea of how to properly work around this issue or how to fix it?
Just add hit testing content shape in your custom button style, like below
Tested with Xcode 11.4 / iOS 13.4
private struct PushBackButtonStyle: ButtonStyle {
let pushBackScale: CGFloat
func makeBody(configuration: Self.Configuration) -> some View {
configuration
.label
.contentShape(Rectangle()) // << fix !!
.scaleEffect(configuration.isPressed ? pushBackScale : 1.0)
}
}
Simply use a.frame and it should work. To make it easily testable I have rewritten it like this:
struct CustomButton: View {
var body: some View {
Button(action: { }) {
VStack(spacing: 10) {
HStack {
Text("Button Text").background(Color.orange)
.frame(minWidth: 0, maxWidth: .infinity)
.background(Color.orange)
}
Divider()
HStack {
Text("Detail Text").background(Color.orange)
.frame(minWidth: 0, maxWidth: .infinity)
.background(Color.orange)
}
}
}
.buttonStyle(PushBackButtonStyle(pushBackScale: 0.9))
}
}
private struct PushBackButtonStyle: ButtonStyle {
let pushBackScale: CGFloat
func makeBody(configuration: Self.Configuration) -> some View {
configuration
.label
.scaleEffect(configuration.isPressed ? pushBackScale : 1.0)
}
}
I hope I could help. :-)
@Edit With video.
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