ios – UIRotationGestureRecognizer多次激活Swift

发布时间：2020-12-14 17:35:35 所属栏目：百科来源：网络整理

导读：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 = UIRotationGestureRecogniz

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.

（编辑：李大同）

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