Triggering onAppear Once or Capturing Button Click Events in DestinationVideo Demo

Question

Created Feb ’25

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In the DestinationVideo demo, the onAppear in UpNextView is triggered again when it is closed, but I only want it to be triggered once. How can I achieve this?

Alternatively, I would like to capture the button click events in the player menu, as shown in the screenshot below.

WX20250210-170526@2x.png

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Answer 1

darkpaw OP

Feb ’25

I use this for making something happen only once. Put it into an Extensions.swift file or something like that:

 extension View {
	func onFirstAppear(perform: @escaping () -> Void) -> some View {
		modifier(OnFirstAppear(perform: perform))
	}
}
 
 
private struct OnFirstAppear: ViewModifier {
	let perform: () -> Void
 
	@State private var firstTime = true
 
	func body(content: Content) -> some View {
		content.onAppear {
			if firstTime {
				firstTime = false
				perform()
			}
		}
	}
}

And you use it like you would use .onAppear, i.e.:

 .onFirstAppear {
  // Do something once
}

0

	extension View {
	func onFirstAppear(perform: @escaping () -> Void) -> some View {
	modifier(OnFirstAppear(perform: perform))
	}
	}


	private struct OnFirstAppear: ViewModifier {
	let perform: () -> Void

	@State private var firstTime = true

	func body(content: Content) -> some View {
	content.onAppear {
	if firstTime {
	firstTime = false
	perform()
	}
	}
	}
	}