在協議中使用UIView.animateWithDuration

Question

如何在Swift協議中使用UIView.animateWithDuration？當我嘗試使用它，我總是得到：

曖昧參考成員 'animateWithDuration（_：延遲：選項：動畫：完成:)'

我怎樣才能獲得參考的UIView（據我所知，animateWithDuration是靜態方法）？

Answer 1

由於您無法在協議聲明本身內提供任何實現，因此您應該在默認實現中引用UIView類。我希望這三個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) 
    } 
}