Swift-- UIViewController中使用到的willRotate父类方法

//UIViewController的willRotate父类方法使用

//以前工作中没有遇到这个需求，所以一直没了解这个父类的方法，用到后其实很简单
//在你的项目中可能会遇到翻转设备使其竖屏出现新的view,横屏对应的view都Hide		
override func willRotate(to toInterfaceOrientation: UIInterfaceOrientation,duration: TimeInterval) {
    
    
print("willRotate 旋转了")
        
        if toInterfaceOrientation.isLandscape{
    
    
            print("isLandscape")
            for v in self.view.subviews{
    
    
                if v.tag == 10{
    
    
                    v.removeFromSuperview()
                }else{
    
    
                    v.isHidden = false
                }
            }
        }else if toInterfaceOrientation.isPortrait {
    
    
            print("isPortrait")
            for v in self.view.subviews{
    
    
                v.isHidden = true
            }
            
            UIView.animate(withDuration: duration, animations: {
    
    
                let v = UIView()
                v.tag = 10
                v.frame = CGRect(x: 10, y: 10, width: UIScreen.main.bounds.width - 20, height: UIScreen.main.bounds.height - 20)
                self.view.addSubview(v)
                v.backgroundColor = UIColor.blue
            })

        }
}
----就这样实现了横竖屏view的切换，在多嘴一句：
       if UIDevice.current.orientation.isPortrait{
    
    
           print("UIDevice.current.orientation.isPortrait 鸡鸡--------")
       } else {
    
    
           print("UIDevice.current.orientation.isLandscape 鸡鸡-----")
       }
可判断横竖屏