CATransition不能正常工作的動畫UILabel

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我想使用CATransition製作一個動畫UILabel，當我觸摸屏幕時，它可以淡出原始文本並淡入新文本。這是我的代碼，我不知道爲什麼沒有動畫。請幫幫我。我使用Xcode 7.3。CATransition不能正常工作的動畫UILabel

var subtitle:UILabel! 
var winsize:CGSize! 

override func viewDidLoad() { 
    super.viewDidLoad() 

    let animation = CATransition() 
    animation.type = kCATransitionFade 
    animation.duration = 0.75 
    animation.fillMode = kCAFillModeBoth 
    animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut) 
    animation.delegate = self 

    self.subtitle = UILabel() 
    self.subtitle.text = "f" 
    self.subtitle.frame = CGRectMake(45, 30, 200, 50) 
    self.subtitle.font = UIFont.systemFontOfSize(25) 
    self.subtitle.textColor = UIColor.grayColor() 
    self.view.addSubview(self.subtitle) 
    self.subtitle.layer.addAnimation(animation, forKey: "animation") 
} 

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) { 

    self.subtitle.text="HighSchool" 
}

與@馬特的幫助，下面的代碼工作。

var subtitle:UILabel! 
var winsize:CGSize! 

override func viewDidLoad() { 
    super.viewDidLoad() 

    winsize = self.view.frame.size 

    self.subtitle = UILabel() 
    self.subtitle.text = "f" 
    self.subtitle.frame = CGRectMake(45, 30, 200, 50) 
    self.subtitle.font = UIFont.systemFontOfSize(25) 
    self.subtitle.textColor = UIColor.grayColor() 
    self.view.addSubview(self.subtitle) 

    UIView.transitionWithView(self.subtitle, duration: 0.5, options: UIViewAnimationOptions.TransitionCrossDissolve, animations: nil, completion: nil) 
} 


override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) { 
    self.subtitle.text="HighSchool" 
}

來源

2016-04-16 user2232335

您的幫助，先謝謝。我想要做的是製作一個UILabel，當我改變它的文本時，原始文本淡出並且新文本淡入，如http://stackoverflow.com/questions/3073520/animate-text-change中所示。 -in-uilabel – user2232335

那麼，你的代碼不會做那樣的事情。你只是說'self.subtitle.text =「HighSchool」'。這裏沒有淡入淡出的動畫。它不會掉出天空;你必須明確地寫入動畫。調用'transitionWithView：duration：options：animations：completion：'並更改文本。這是三行代碼，非常簡單。 – matt

它的工作原理！非常感謝！ – user2232335

像這樣：

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) { 
    let opts : UIViewAnimationOptions = .TransitionCrossDissolve 
    UIView.transitionWithView(self.subtitle, duration: 0.75, options: opts, animations: { 
     self.subtitle.text="HighSchool" 
    }, completion: nil) 
}

來源

2016-04-16 01:14:37 matt

CATransition不能正常工作的動畫UILabel

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