使用UIRotationGestureRecognizer时,会识别旋转,但会多次触发操作.这是我的代码：
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view,typically from a nib.
let rotation = UIRotationGestureRecognizer(target: self,action: #selector(ViewController.lol))
self.view.addGestureRecognizer(rotation)
}
func lol() {
print ("hi")
UIView.animateWithDuration(5.0,animations: {
let currTransform = self.view.transform
let newTransform = CGAffineTransformConcat(currTransform,CGAffineTransformMakeRotation(CGFloat(M_PI)))
self.view.transform = newTransform
})
}
解决方法
查看UIRotationGestureRecognizer的状态.
let rotation = UIRotationGestureRecognizer(target: self,action: #selector(ViewController.lol(_:)))
func lol(sender: UIRotationGestureRecognizer) {
print(sender.state)
我希望你刚收到Began和End州.