屏幕边缘手势识别UIGestureRecognizer
屏幕边缘手势的父类是平移手势，而其他六个手势的父类是UIGestureRecognizer
屏幕边缘手势的视图必需紧帖屏幕的某个边缘
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)
创建屏幕边缘手势
let screen = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(screenAction))
设置支持的边缘
sscreen.edges = .left
把屏幕边缘手势添加到gestureView上
gestureView.addGestureRecognizer(screen)
实现轻扫手势关联方法screenAction
//MARK:- 屏幕边缘手势关联方法
func screenAction(sender:UIScreenEdgePanGestureRecognizer){
sender.view?.backgroundColor = self.backRandomColor()
}
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
}
