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I'm working on a photo Collage application. I want to perform an action on image view so any one can help me to solve my problem. when i pick image from photo library and shown on image view after when double click on image view i want to push or present a new view to crop this image .....so anyone tell me what i do to solve my problem...

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8 回答 8

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使用自定义类型的 UIButton 并将图像放入其中。你完成了。

于 2012-06-14T09:53:26.407 回答
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为 ImageView 添加手势

UITapGestureRecognizer *sg=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(HandleEvent)];
    sg.numberOfTapsRequired=2;
    [BottomBar addGestureRecognizer:sg];
    [sg release];

并在这里完成您的任务：

-(void)HandleEvent
{

// your task
}

谢谢

于 2012-06-14T10:00:40.880 回答
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You should use a UIButton instead of an UIImageView. You can set its style to custom and then asign it an image. UIButton provides all the methods for double tap already built in.

于 2012-06-14T09:52:36.017 回答
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如果你使用 UIImageView 类，首先设置 setUserInteractionEnabled:YES 。然后将 UITapGestureRecognizer 事件设置为图像视图。

于 2015-01-21T05:55:29.380 回答
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制作一个按钮，并清除它的颜色。在按钮的背面，放置您的图像视图，以便您的图像视图似乎可见而按钮不可见。现在将事件附加到按钮。

于 2012-06-14T09:53:14.283 回答
0

尝试这个 

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
 CGPoint locationPoint = [[touches anyObject] locationInView:self.view];
    CGPoint viewPoint = [imageView convertPoint:locationPoint fromView:self.view];
    if ([imageView pointInside:viewPoint withEvent:event]) {
       //do something
    }
}
于 2015-01-21T06:12:46.587 回答
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如果您使用的是 UIImageView，请确保使用setUserInteractionEnabled:YES. 然后你需要在 touchesBegan,ended, (canceled) 中检查你的触摸。

于 2012-06-14T09:55:49.370 回答
0

您已设置好使用 UIImageView，您必须继承 UIImageView 并覆盖您想要拦截的触摸方法。例如：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
   // Call super to make sure you don't lose any functionality
   [super touchesBegan:touches withEvent:event];

   // Perform the actions you want to perform with the tap.
}

使用 UIButtons 作为 UIImageViews 的替代品是一个好主意，您只需将连接从每个按钮拖到视图控制器中的插座并处理操作即可。您可以像当前使用 UIImageViews 一样在按钮上设置背景图像。将您的按钮类型设置为自定义，您会很好

于 2012-06-14T09:56:39.437 回答