Swift动画WithDuration语法是什么? [英] Whats the Swift animate WithDuration syntax?

问题描述

我正在将一个较旧的应用程序移植到Xcode 7 beta，但动画出现错误:

I'm porting an older app over to Xcode 7 beta and I'm getting an error on my animations:

无法使用类型为参数的列表调用'animateWithDuration' '((Double，delay:Double，options:nil，animations(()-> _， 完成:无)'

Cannot invoke 'animateWithDuration' with an argument list of type '(Double, delay: Double, options: nil, animations: () -> _, completion: nil)'

代码如下:

 UIView.animateWithDuration(0.5, delay: 0.3, options: nil, animations: {
      self.username.center.x += self.view.bounds.width
    }, completion: nil)

这在Xcode 6中有效，所以我假设这是Swift中的更新.所以我的问题是:

This works in Xcode 6 so I'm assuming this is an update in Swift. So my question is:

animateWithDuration的Swift 3语法是什么?

推荐答案

Swift 3/4语法

以下是Swift 3语法的更新:

Swift 3/4 Syntax

Here's an update with the Swift 3 Syntax:

UIView.animate(withDuration: 0.5, delay: 0.3, options: [.repeat, .curveEaseOut, .autoreverse], animations: {
    self.username.center.x += self.view.bounds.width
}, completion: nil)

如果您需要添加完成处理程序，只需添加一个闭包，如下所示:

If you need to add a completion handler just add a closure like so:

UIView.animate(withDuration: 0.5, delay: 0.3, options: [.repeat, .curveEaseOut, .autoreverse], animations: {
    // animation stuff      
}, completion: { _ in
    // do stuff once animation is complete
})

---

旧答案:

事实证明，这是一个非常简单的修复程序，只需将options: nil更改为options: [].

It turns out it's a very simple fix, just change options: nil to options: [].

Swift 2.2语法:

UIView.animateWithDuration(0.5, delay: 0.3, options: [], animations: {
      self.username.center.x += self.view.bounds.width
    }, completion: nil)

发生了什么变化?

Swift 2摆脱了C样式逗号分隔的选项列表，而支持选项集(请参阅:

What changed?

Swift 2 got rid of the C-Style comma-delimited list of options in favor of option sets (see: OptionSetType). In my original question, I passed in nil for my options, which was valid prior to Swift 2. With the updated syntax, we now see an empty option list as an empty set: [].

带有某些选项的animateWithDuration示例如下:

An example of animateWithDuration with some options would be this:

 UIView.animateWithDuration(0.5, delay: 0.3, options: [.Repeat, .CurveEaseOut, .Autoreverse], animations: {
      self.username.center.x += self.view.bounds.width
    }, completion: nil)

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