Swift: beginAnimations(_:context:) was deprecated in iOS 13.0: Use the block-based animation API instead

用 Xcode 14.2 升级一个 Swift 项目时有编译警告️⚠提示 beginAnimations() 在 iOS 13.0 后已经不推荐使用，应该用 block-based animation 代替。

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UIView.beginAnimations(nil, context: nil) // 'beginAnimations(_:context:)' was deprecated in iOS 13.0: Use the block-based animation API instead
UIView.setAnimationDuration(0.5) // 'setAnimationDuration' was deprecated in iOS 13.0: Use the block-based animation API instead
UIView.commitAnimations() // 'commitAnimations()' was deprecated in iOS 13.0: Use the block-based animation API instead 

currentOverlay = overlay
currentOverlayTarget = overlayTarget
currentLoadingText = loadingText

修改为使用 Block-based animation 的代码：

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UIView.animate(withDuration: 0.5) {
    currentOverlay = overlay
    currentOverlayTarget = overlayTarget
    currentLoadingText = loadingText
}

如果用 Objective-C 则修改如下：

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[UIView animateWithDuration: 0.5
                 animations: ^{
    currentOverlay = overlay;
    currentOverlayTarget = overlayTarget;
    currentLoadingText = loadingText;
}];