SwiftUI:动画文本颜色-前景色()

问题描述

我一直在尝试对UI的各个部分进行动画处理，但是似乎您无法为SwiftUI Text的frontantColor设置动画?我想在状态改变时平稳地切换某些文本的颜色.如果我为文本"周围的视图设置背景颜色动画，则此方法很好，但是前景色不起作用.有没有人有幸为这样的变化做动画?不确定这是Xcode beta错误还是预期的功能...

I've been trying to work on animating various parts of the UI, but it seems as though you can't animate a SwiftUI Text's foregroundColor? I want to switch the color of some text smoothly when a state changes. This works fine if I animate the background color of the Text's surrounding view, but foreground color does not work. Has anyone had any luck animating a change like this? Unsure if this is an Xcode beta bug or it's intended functionality...

Text(highlightedText)
    .foregroundColor(color.wrappedValue)
    .animation(.easeInOut)

// Error: Cannot convert value of type 'Text' to closure result type '_'

推荐答案

有一个更简单的方法，该方法借鉴了Apple的动画视图和过渡"教程代码. HikeGraph中的GraphCapsule实例化证明了这一点.

There is a much easier way, borrowing from Apple's "Animating Views and Transitions" tutorial code. The instantiation of GraphCapsule in HikeGraph demonstrates this.

foregroundColor不能动画，而colorMultiply可以动画.将前景色设置为白色，然后使用colorMultiply设置所需的实际颜色.要从红色动画为蓝色:

While foregroundColor cannot be animated, colorMultiply can. Set the foreground color to white and use colorMultiply to set the actual color you want. To animate from red to blue:

struct AnimateDemo: View {
    @State private var color = Color.red

    var body: some View {
        Text("Animate Me!")
            .foregroundColor(Color.white)
            .colorMultiply(self.color)
            .onTapGesture {
                withAnimation(.easeInOut(duration: 1)) {
                    self.color = Color.blue
                }
        }
    }
}

struct AnimateDemo_Previews: PreviewProvider {
    static var previews: some View {
        AnimateDemo()
    }
}

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