在协议中使用UIView.animateWithDuration

Question

如何在Swift协议中使用UIView.animateWithDuration？当我尝试使用它，我总是得到：

暧昧参考成员 'animateWithDuration（_：延迟：选项：动画：完成:)'

我怎样才能获得参考的UIView（据我所知，animateWithDuration是静态方法）？

Answer 1

由于您无法在协议声明本身内提供任何实现，因此您应该在默认实现中引用UIView类。我希望这三个模板案例之一是你需要的：

import UIKit 

protocol SomeProtocol { 
    static func animateWithDuration(duration: NSTimeInterval, delay: NSTimeInterval, options: UIViewAnimationOptions, animations:() -> Void, completion: ((Bool) -> Void)?) 
    func animateWithDuration(duration: NSTimeInterval, delay: NSTimeInterval, options: UIViewAnimationOptions, animations:() -> Void, completion: ((Bool) -> Void)?) 
    func someCustomFuncForAnimate() 
} 

extension SomeProtocol { 
    static func animateWithDuration(duration: NSTimeInterval, delay: NSTimeInterval, options: UIViewAnimationOptions, animations:() -> Void, completion: ((Bool) -> Void)?) { 
     UIView.animateWithDuration(duration, delay: delay, options: options, animations: animations, completion: completion) 
    } 
    func animateWithDuration(duration: NSTimeInterval, delay: NSTimeInterval, options: UIViewAnimationOptions, animations:() -> Void, completion: ((Bool) -> Void)?) { 
     UIView.animateWithDuration(duration, delay: delay, options: options, animations: animations, completion: completion) 
    } 
    func someCustomFuncForAnimate() { 
     UIView.animateWithDuration(0.2, delay: 1, options: .TransitionCrossDissolve, animations: {/*...*/}, completion: nil) 
    } 
}