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如何将幻灯片动画添加到uiview高度常数?

uiswipegesturerecognizer swift

0

WoShiNiBaBa · 技术社区 · 8 年前

@IBAction func swipeUp(_ sender: UISwipeGestureRecognizer) {
        if(upperView.isHidden == false){
            upperView.isHidden = true
            self.heightUpperView.constant = 0
            self.view.layoutIfNeeded()
        }
        else{
            self.heightUpperView.constant  = 372
            upperView.isHidden = false
            self.view.layoutIfNeeded()
        }
    }

提前感谢您的帮助。

2 回复 | 直到 8 年前

1

3

Community Mohan Dere 5 年前

swift 3.0

你可以试试下面的一个。

@IBAction func swipeUp(_ sender: UISwipeGestureRecognizer) {
        if(upperView.isHidden == false) { 
          upperView.isHidden = true
          heightUpperView.constant = 0
        }
        else{
          upperView.isHidden = false 
          heightUpperView.constant  = 372
        }
        UIView.animate(withDuration: 0.8) { 
          self.view.layoutIfNeeded()
        }
}

2

1

Vladislav Kovalyov 8 年前

self.view.layoutIfNeeded() UIView.animateWith... 。下面是一个代码示例:

@IBAction func swipeUp(_ sender: UISwipeGestureRecognizer) 
{
     // Set new constants first
     if(upperView.isHidden == false)
     {
          upperView.isHidden = true
          self.heightUpperView.constant = 0
     }
     else
     {
          self.heightUpperView.constant  = 372
          upperView.isHidden = false
     }

     // This line will animate all your constraint changes
     UIView.animate(withDuration: 0.3) 
     {
          self.view.layoutIfNeeded()
     }
}