swift - UITapGestureRecognizer 不起作用

Question

我想设置一个 UITapGestureRecognizer 以允许用户添加图像作为配置文件。我设置了代码，但是当我触摸图像时，什么也没有发生。代码如下:

@IBAction func selezionaFoto(sender: UITapGestureRecognizer) {

    fieldNome.resignFirstResponder()

    func selezionaLibreria(action : UIAlertAction!) {
        UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.Default, animated: true)
        CameraManager.sharedInstance.newImageFromLibraryForController(self, editing: false)
    }

    func scattaFoto(action : UIAlertAction!) {
        UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.Default, animated: true)
        var circle = UIImageView(frame: UIScreen.mainScreen().bounds)
        circle.image = UIImage(named: "overlay")
        CameraManager.sharedInstance.newImageShootForController(self, editing: false, overlay:circle)
    }

    var myActionSheet = UIAlertController(title: NSLocalizedString("ACTION_IMAGE_TITLE", comment: ""),
        message: NSLocalizedString("ACTION_IMAGE_TEXT", comment: ""),
        preferredStyle: UIAlertControllerStyle.ActionSheet)

    myActionSheet.addAction(UIAlertAction(title: NSLocalizedString("BUTTON_LIBRARY", comment: ""),
        style: UIAlertActionStyle.Default,
        handler: selezionaLibreria))

    myActionSheet.addAction(UIAlertAction(title: NSLocalizedString("BUTTON_SHOOT", comment: ""),
        style: UIAlertActionStyle.Default,
        handler: scattaFoto))

    myActionSheet.addAction(UIAlertAction(title: NSLocalizedString("BUTTON_CANCEL", comment: ""),
        style: UIAlertActionStyle.Cancel,
        handler: nil))

    self.presentViewController(myActionSheet, animated: true, completion: nil)

}


func textFieldShouldReturn(textField: UITextField) -> Bool {
    textField.resignFirstResponder() 
    return true
}

func incomingImage(image: UIImage) {
    UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.LightContent, animated: true)
    immagine.image = image
    immagineSelezionata = image
}

func cancelImageSelection() {
    UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.LightContent, animated: true)
}

Storyboard中的第一个元素是图像，然后是文本字段。

Answer 1

我最近遇到了同样的问题，我有复杂的 View 层次结构，并且手势没有响应操作的原因是一个 superView 设置为 isUserInteractionEnabled 为 false，正如您可能知道的，应用程序如何接收手势以及转到链中的响应者，就是这条链中的所有UIResponders都应该isUserInteractionEnabled = true，才能传递到最顶层的 View 。我假设您遇到了同样的情况，因此只需检查层次结构中的所有 View 即可。