英文:
How to make UIView.animate function to be sync?
问题
我在按钮点击时在我的ViewController中调用animateScan()作为同步函数。因此，在这个函数之后，我调用另一个函数来呈现另一个ViewController。在animateScan()中，我有一个2.5秒的动画，但根据我理解，UIView.animate是异步函数，所以当我调用它时，我只是设置了动画，而animateScan()在不等待这2.5秒的情况下结束了。所以我的问题是，我是否可以以某种方式强制animateScan()函数等待这2.5秒的动画？我能使UIView.animate成为同步的吗？
P.S. 我不想在UIView.animate中使用完成闭包。
英文:
So I have some function with animation:
func animateScan() {
topConstraint.constant = frame.height
UIView.animate(withDuration: 2.5) {
self.superview?.layoutIfNeeded()
}
}
I call animateScan() in my ViewController on button tap as a sync functions. So after this function I call another function to present another ViewController. In animateScan() I have animation with 2.5 duration, but UIView.animate, as I understand Is async function, so when I call it I just setup animation, and animateScan() finishes without waiting this 2.5sec.
So my question is, can I somehow force animateScan() function to wait this 2.5 animation? Can I make UIVIew.animate to be synchronous?
P.S. I don't want to use completion closure in UIview.animate.
答案1
得分: 0
你不应该将动画设为同步，因为等待其完成会暂停主线程，这是一个非常糟糕的想法。你应该使用完成处理程序。这就是它们存在的原因。
英文:
You should not make the animation synchronous as waiting for its completion would suspend the main thread and that is a very bad idea. You should use the completion handlers. That's why they exist.
答案2
得分: 0
你可以将你的方法包装成一个 async 方法：
func animateScan() async {
await withCheckedContinuation { continuation in
// ... 其他代码 ...
UIView.animate(withDuration: 2.5) {
// ... 其他代码 ...
} completion: { _ in
continuation.resume()
}
}
}
现在，当你在一个 async 上下文中使用 await 调用 animateScan() 时，你的代码会在等待完成之前神奇地暂停并恢复。
英文:
You can wrap your method up as an async method:
func animateScan() async {
await withCheckedContinuation { continuation in
// ... whatever ...
UIView.animate(withDuration: 2.5) {
// ... whatever ...
} completion: { _ in
continuation.resume()
}
}
}
Now when you call animateScan() by saying await in an async context, your code will magically pause and wait for completion before resuming.
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