Question

为什么我的UITapGestureRecognizer没有触发UIAlertAction的功能？当我为iOS Simulator构建并运行我的应用时，我的图片将无法识别触发警报的点按。

任何建议将不胜感激。谢谢，斯威夫特朋友们！

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    let rect = CGRect(x:20,y:20,width:150,height:100)
    let imageView = UIImageView(frame:rect)

    let image = UIImage(named:"image.png")
    imageView.image = image

   // imageView.isUserInteractionEnabled = true
    self.view.addSubview(imageView)
    let guesture = UITapGestureRecognizer(target: self,action:
        #selector(ViewController.singleTap))
    imageView.addGestureRecognizer(guesture)
}


func singleTap()
{
    let alertView = UIAlertController(title: "Heading", message: "Message!", preferredStyle: .Alert)

    let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
    alertView.addAction(defaultAction)

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

}

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

}

Answer 1

在代码中取消注释此行

// imageView.isUserInteractionEnabled = true。

可能会奏效。另外添加

image.multipleTouchEnabled = YES;
tap.numberOfTapsRequired = 1;

无法响应图像视图上的点按

1 个答案: