README.md

Sheet content doesn't stay centered when programmatically changing detent

Basic Information

Which platform is most relevant for your report?

iOS

Which technology does your report involve?

SwiftUI

What type of feedback are you reporting?

Incorrect/Unexpected Behavior

What build does the issue occur on?

iOS 17.4 Seed 3 (21E5200d)

Where does the issue occur?

On device

Description

• Run the given code.
• Drag the sheet up and down, and notice the button always stays centered.
• Now toggle the selected detent, and notice the button jumps and is no longer always centered.
• I would expect the behavior whether dragging or programmatically setting the selected detent to be the same.

Evidence

Visual

Demo	Workaround
	Unknown

Code

AppleFeedback/FB13705183/demo.swift

Lines 1 to 26 in 965cefe

	import SwiftUI
	struct ContentView: View {
	@State private var presented = true
	@State private var detent: PresentationDetent = .large
	var body: some View {
	Button("Present") {
	presented = true
	}
	.sheet(isPresented: $presented) {
	Button("Toggle detent") {
	if detent == .large {
	detent = .medium
	} else {
	detent = .large
	}
	}
	.presentationDetents([.medium, .large], selection: $detent)
	}
	}
	}
	#Preview {
	ContentView()
	}