ios – 在Swift中以编程方式添加UIGestureRecognizer到子视图

2020年01月16日作者：佚名

我目前有一个子视图,它创建并添加到ViewDidLoad()中的UIView中.我正在尝试使用UIGestureRecognizers来检测点击并取消隐藏特定按钮.我目前的代码：

override func viewDidLoad() {
    super.viewDidLoad()
    architectView = CustomClass(frame: self.view.bounds)
    self.view.addSubview(architectView)        
    let gestureRecognizer = UITapGestureRecognizer(target: self,action: "handleTap:")
    gestureRecognizer.delegate = self
    architectView.addGestureRecognizer(gestureRecognizer)
}

func handleTap(gestureRecognizer: UIGestureRecognizer) {
    let alert = UIAlertController(title: "Alert",message: "Message",preferredStyle: UIAlertControllerStyle.Alert)
    alert.addAction(UIAlertAction(title: "Click",style: UIAlertActionStyle.Default,handler: nil))
    self.presentViewController(alert,animated: true,completion: nil)
}

handleTap()函数是一个简单的测试,用于查看是否正在识别抽头.按下时,此代码不会触发UIAlert？我错过了什么？

解决方法

我在这里测试了你的代码,它确实有效.但是,我认为您可能缺少将UIGestureRecognizerDelegate协议添加到View Controller.见下文：

class ViewController: UIViewController,UIGestureRecognizerDelegate {

    var architectView = UIView()

    override func viewDidLoad() {
        super.viewDidLoad()
        architectView = UIView(frame: self.view.bounds)
        self.view.addSubview(architectView)
        let gestureRecognizer = UITapGestureRecognizer(target: self,action: "handleTap:")
        gestureRecognizer.delegate = self
        architectView.addGestureRecognizer(gestureRecognizer)
    }

    func handleTap(gestureRecognizer: UIGestureRecognizer) {
        let alert = UIAlertController(title: "Alert",preferredStyle: UIAlertControllerStyle.Alert)
        alert.addAction(UIAlertAction(title: "Click",handler: nil))
        self.presentViewController(alert,completion: nil)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

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