SOLVED: Animations - Strange Behavior when Calling Animations in ContentView – 100 Days of SwiftUI

@iosPit

Dec '21

I'm working through this example that Paul posted:

struct ContentView: View {
    let letters = Array("Hello SwiftUI")
    @State private var enabled = false
    @State private var dragAmount = CGSize.zero

    var body: some View {
        HStack(spacing: 0) {
            ForEach(0..<letters.count) { num in
                Text(String(letters[num]))
                    .padding(5)
                    .font(.title)
                    .background(enabled ? .blue : .red)
                    .offset(dragAmount)
                    .animation(.default.delay(Double(num) / 20), value: dragAmount))
            }
        }
        .gesture(
            DragGesture()
                .onChanged { dragAmount = $0.translation }
                .onEnded { _ in
                    dragAmount = .zero
                    enabled.toggle()
                }
        )
    }
}

This is supposed to create a snake-like animation with the characters in the string.

I wrote this code in a separate Swift View called "SnakeTextAnimation", but when I try to instantiate this struct within ContentView with SnakeTextAnimation(), it doesn't produce the expected resut. It changes colors, but it doesn't move.

Why does this only work in ContentView, but not when I call it from another view?

Xcode Project: https://github.com/iosPit/CodeSnippets -> Animations Folder

2

@NigelGee HWS+

Dec '21

You missing .offset(dragAmount)

struct SnakeTextAnimation: View {
    let snakeText = Array("Snake Text Animation")
    @State private var isEnabled = false
    @State private var dragAmount = CGSize.zero

    var body: some View {
        HStack(spacing: 0) {
            ForEach(0..<snakeText.count) { num in
                Text(String(snakeText[num]))
                    .padding(1)
                    .font(.title)
                    .background(isEnabled ? .blue : .red)
                    .offset(dragAmount)
                    .animation(.default.delay(Double(num)/20), value: dragAmount)
            }
        }
        .gesture(
            DragGesture()
                .onChanged { dragAmount = $0.translation }
                .onEnded { _ in
                    dragAmount = .zero
                    isEnabled.toggle()
                }
        )
    }
}

Works fine then

2

@iosPit

Dec '21

Thank you, Appreciate the help !:D

2

@iosPit

Dec '21

@Obelix, I think Nigel went into my Github repository to figure out what I was missing. The code I pasted is from the article.

I thought I had written the code in the article correctly into my XCode, but I missed the .offset(dragAmount)

-Pit

2

SOLVED: Animations - Strange Behavior when Calling Animations in ContentView

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