'animate(withDuration:delay:options:animations:)‘用法不明确

Question

我已经升级到最新发布的Xcode8，而这个

let mediumInterval: TimeInterval = 0.6
UIView.animate(withDuration: mediumInterval) {
  print("test")
}

给了我错误Ambiguous use of 'animate(withDuration:delay:options:animations:)'我真的看不出这里有什么模棱两可的……UIView中声明的所有animate函数都是

open class func animate(withDuration duration: TimeInterval, delay: TimeInterval, options: UIViewAnimationOptions = [], animations: @escaping () -> Swift.Void, completion: (@escaping (Bool) -> Swift.Void)? = nil)

open class func animate(withDuration duration: TimeInterval, animations: @escaping () -> Swift.Void, completion: (@escaping (Bool) -> Swift.Void)? = nil)

open class func animate(withDuration duration: TimeInterval, animations: @escaping () -> Swift.Void)

open class func animate(withDuration duration: TimeInterval, delay: TimeInterval, usingSpringWithDamping dampingRatio: CGFloat, initialSpringVelocity velocity: CGFloat, options: UIViewAnimationOptions = [], animations: @escaping () -> Swift.Void, completion: (@escaping (Bool) -> Swift.Void)? = nil)

让xcode编译===的===解决方案

UIView.animate(withDuration: mediumInterval, animation: {
  print("test")
}, completion: nil)

将会编译，

UIView.animate(withDuration: mediumInterval, animation: {
  print("test")
})

都会像以前一样失败。我还是不明白到底是怎么回事。

Answer 1

看起来我一直在使用的PromiseKit有一个UIView扩展，它定义了一个冲突版本的动画(https://github.com/PromiseKit/UIKit/blob/master/Sources/UIView%2BPromise.swift)

XCode无法向我展示这两个相互冲突的版本是从哪里来的，所以我花了一段时间才明白。我已经报告了这个问题。

Answer 2

我也犯了同样的错误，因为我忘了在动画中加一个"s“。所以也许：

UIView.animate(withDuration: mediumInterval, animation: {
  print("test")
})

不会因此而编译。