SwiftUI-如何脉动图像不透明度? [英] SwiftUI - how to pulsate image opacity?
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问题描述
我在SwiftUI中有一个图片,希望永久脉动"(每秒来一次).
I have an Image in SwiftUI that I would like to "pulsate" (come & go every second or so) forever.
我尝试了很多事情,但似乎无法达到我想要的效果.我尝试过的一件事是下面的代码(似乎什么都不做!:)).
I tried a number of things but I can't seem to get the effect I want. One of the things I tried is the code below (which seems to do nothing! :) ).
Image(systemName: "dot.radiowaves.left.and.right" )
.foregroundColor(.blue)
.transition(.opacity)
.animation(Animation.easeInOut(duration: 1)
.repeatForever(autoreverses: true))
有什么想法吗?
推荐答案
这里是一种方法.使用Xcode 11.4/iOS 13.4进行了测试
Here is an approach. Tested with Xcode 11.4 / iOS 13.4
struct DemoImagePulsate: View {
@State private var value = 1.0
var body: some View {
Image(systemName: "dot.radiowaves.left.and.right" )
.foregroundColor(.blue)
.opacity(value)
.animation(Animation.easeInOut(duration: 1).repeatForever(autoreverses: true))
.onAppear { self.value = 0.3 }
}
}
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