Swift3中的UIView动画

Question

我试图将UIImageView移动到顶部，底部，左侧和右侧。动画应该四次四次。中心图像向上移动，然后移到左侧位置和右侧位置。我怎样才能使用UIAnimation Swift 3来实现这一点？

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如何使用动画将图像移动到顶部，左侧，右侧和底部？

Answer 1

UIView.animate(withDuration: 1, delay:0, animations: { 
     //top 
     self.tempVW.frame.origin.y = self.tempVW.frame.origin.y - 100 
    }, completion: {completion in 
     UIView.animate(withDuration: 1, delay:0, animations: { 
      //left 
      self.tempVW.frame.origin.x = self.tempVW.frame.origin.x - 100 

     }, completion: {completion in 
      UIView.animate(withDuration: 1, delay:0, animations: { 
       //bottom 
       self.tempVW.frame.origin.y = self.tempVW.frame.origin.y + 100 

      }, completion: {completion in 
       UIView.animate(withDuration: 1, delay:0, animations: {      //right 
        self.tempVW.frame.origin.x = self.tempVW.frame.origin.x + 100 
       }, completion: {completion in 


       }) 
      }) 
     }) 

    }) 

Answer 2

UIView.animate(withDuration: 1, delay:0, animations: { 
     //top 
     self.imageView.frame.origin.y = self.imageView.frame.origin.y - 100 
    }, completion: {completion in 
     UIView.animate(withDuration: 1, delay:0, animations: { 
      //bottom 
      self.imageView.frame.origin.y = self.imageView.frame.origin.y + 100 
     }, completion: {completion in 
      UIView.animate(withDuration: 1, delay:0, animations: { 
       //left 
       self.imageView.frame.origin.x = self.imageView.frame.origin.x - 100 

      }, completion: {completion in 
       UIView.animate(withDuration: 1, delay:0, animations: { 

       }, completion: {completion in 
        //right 
        self.imageView.frame.origin.x = self.imageView.frame.origin.x + 100 
       }) 
      }) 
     }) 

    }) 

Answer 3

您应该使用关键帧动画这一点，因为它允许你指定的动画顺序。以下是一个基本示例：

let animationDuration = 2.0 
let position: CGFloat = 50.0 
let viewToAnimate = UIImageView() 

UIView.animateKeyframes(withDuration: animationDuration, delay: 0.0, options: .calculationModeLinear, animations: { 
    UIView.addKeyframe(withRelativeStartTime: 0, relativeDuration: 1/3, animations: { 
     viewToAnimate.frame.origin.y = viewToAnimate.frame.origin.y + position 
    }) 
    UIView.addKeyframe(withRelativeStartTime: 1/4, relativeDuration: 1/4, animations: { 
     viewToAnimate.frame.origin.y = viewToAnimate.frame.origin.y - (position * 2) 
    }) 
    UIView.addKeyframe(withRelativeStartTime: 2/4, relativeDuration: 1/4, animations: { 
     viewToAnimate.frame.origin.x = viewToAnimate.frame.origin.x - position 
    }) 
    UIView.addKeyframe(withRelativeStartTime: 3/4, relativeDuration: 1/4, animations: { 
     viewToAnimate.frame.origin.x = viewToAnimate.frame.origin.x + (position * 2) 
    }) 
}, completion: { completed in 

})