Question

我有一个ImageView，当用户按下图像视图将消息显示为警报时，我想要它。我应该使用什么方法？你能举个例子吗？

提前致谢..

Answer 1

添加UITapGestureRecognizer：

imageView.userInteractionEnabled = YES;
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] 
    initWithTarget:self action:@selector(handleTap:)];
[imageView addGestureRecognizer:tapRecognizer];
[tapRecognizer release];

然后你的回调......

- (void)handleTap:(UITapGestureRecognizer *)tapGestureRecognizer
{
  //show your alert...
}

Answer 2

使用触摸事件方法执行任务

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{

    UITouch *touch = [[event allTouches] anyObject];

    CGPoint location= [touch locationInView:self.view];

    if(CGRectContainsPoint(urImageView.frame, location)) {
        //AlertView COde
    }
}

Answer 3

如果您不打算将UIImageView子类化为覆盖触摸事件方法 - 或者在ViewController中实现触摸方法并检查框架，则触摸位于图像视图框架中 - 可以（并且这可能更容易）UITapGestureRecognizer添加UIImageView 。

See here in the documentation了解更多详情

UITapGestureRecognizer* tapGR = [[UITapGestureRecognizer alloc]
    initWithTarget:self action:@selector(tapOnImage:)];
[yourImageView addGestureRecognizer:tapGR];
[tagGR release];

然后根据需要实施-(void)tapOnImage:(UIGestureRecognizer*)tapGR方法

Answer 4

UITapGestureRecognizer *singleTapOne = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
    singleTapOne.numberOfTouchesRequired = 1; singleTapOne.numberOfTapsRequired = 1; singleTapOne.delegate = self;
[self.view addGestureRecognizer:singleTapOne]; [singleTapOne release];


- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer

Answer 5

首先，启用属性

yourImgView.setUserInteractionEnabled = TRUE;

然后在viewDidLoad上应用以下代码;

UITapGestureRecognizer *tapOnImg = [[UITapGestureRecognizer alloc] initWithTarget:self  action:@selector(handleTapOnImgView:)];
tapOnImg.numberOfTapsRequired = 1; tapOnImg.delegate = self;
[yourImgView addGestureRecognizer:tapOnImg];

Answer 6

使用触摸委托方法并在那里找到您的图片视图，

Answer 7

如果您使用imageview的类覆盖UITapGestureRecognizer，则可以覆盖UIResponder，而不是使用touchesBegan：

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
      UITouch *touch = [touches anyObject];
      if ([touch view] == YOUR_IMAGE_VIEW) {
          // User clicked on the image, display the dialog.
          UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Image Clicked"     message:@"You clicked an image." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
          [alert show];
          [alert release];
      }
}

您必须确保图片视图userInteractionEnabled为YES。

触摸UIImageView时显示UIAlert

7 个答案: