旋转手势识别UIRotationGestureRecognizer
以下创建手势将会添加到gestureView上
//将view的背景颜色设置为白色
self.view.backgroundColor = UIColor.white
//创建一个UIView
let gestureView = UIView(frame: CGRect(x: 0, y: 100, width:
308, height: 308))
gestureView.backgroundColor = UIColor.green
self.view.addSubview(gestureView)
创建旋转手势
let rotation = UIRotationGestureRecognizer(target: self, action: #selector(rotationAction))
把旋转手势添加到gestureView上
gestureView.addGestureRecognizer(rotation)
实现旋转手势关联方法rotationAction
//MARK:- 旋转手势关联方法
func rotationAction(sender:UIRotationGestureRecognizer){
//sender.rotation手势旋转的弧度
sender.view?.transform = (sender.view?.transform.rotated(by: sender.rotation))!
//将上次的弧度置为1
sender.rotation = 0
}
定义一个backRandomColor方法用来随机变换背景颜色
func backRandomColor()->UIColor {
//产生0～1的随机数
let redView = Float(arc4random_uniform(256))/255.0
let greenView = Float(arc4random_uniform(256))/255.0
let blueView = Float(arc4random_uniform(256))/255.0
//产生随机颜色
let color = UIColor(red: CGFloat(redView), green: CGFloat(greenView), blue: CGFloat(blueView), alpha: 1.0)
return color
}
