iPhone - Catching an uiimageview touch events from a custom cell

i would like to build a custom table view cell and put in him a imageview and when the user click the imageview to popup a view on the viewcontroller-and the view will kn开发者_StackOverflow中文版ow which cell the image was pressed.

thx

Use UITapGestureRecognizer gesture to detect touches on any view inherited from UIView.

Use as below.....

Add Tap gesture UITapGestureRecognizer to myImageView view (type of UIImageView).

UITapGestureRecognizer *myTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gestureTapEvent:)];
myImageView.userInteractionEnabled = YES;
[myImageView addGestureRecognizer:myTapGesture];
[myTapGesture release];    

Implement gestureTapEvent: method to receive the touch event.

-(void)gestureTapEvent:(UITapGestureRecognizer *)gesture 
{

}

UPDATED:

you could access view with you attached the gesture using view property of UIGestureRecognizer .

@property(nonatomic, readonly) UIView *view;

So your gestureTapEvent: method should be like as below .

-(void)gestureTapEvent:(UITapGestureRecognizer *)gesture 
{
     UIImageView* myImageView = (UIImageView*)gesture.view ;
}

You have multiple possibilities for that:

• Use UIGestureRecognizer to add a UITapGestureRecognizer on your imageView (I would recommend this solution)
• Subclass UIImageView to override touchesBegan:withEvent: methods, etc.
• Add a UIButton (of type Custom, to avoid the frame of the button to be drawn) over your UIImageView

Example:

UITapGestureRecognizer *gestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageViewClicked:)];
[cell.yourImageView addGestureRecognizer:gestureRecognizer];
[gestureRecognizer release];

[EDIT]

Then when you implement your imageViewClicked method, you can get the tapped ImageView using the view property of the GestureRecognizer. Starting from that, you can for example:

• use the tag of your imageView (if you affected it in your tableView:cellForRowAtIndexPath: method) to retrieve the tag and do whatever you want with it (depending on what you affected it to, for example you may have set imageView.tag = indexPath.row in tableView:cellForRowAtIndexPath: and get that indexPath row back then)
• Go thru the superviews of the imageView up to the UITableViewCell, then ask for its indexPath to get it back and do whatever you want with it.

Example:

-(void)imageViewClicked:(UITapGestureRecognizer*)gestRecognizer
{
    UIImageView* iv = (UIImageView*)gestRecognizer.view;
    NSInteger tag = iv.tag; // then do what you want with this

    // or get the cell by going up thru the superviews until you find it
    UIView* cellView = iv;
    while(cellView && ![cellView isKindOfClass:[UITableViewCell class]])
        cellView = cellView.superview; // go up until you find a cell

    // Then get its indexPath
    UITableViewCell* cell = (UITableViewCell*)cellView;
    NSIndexPath* indexPath = [self.tableView indexPathForCell:cell];
}

Instead of UIImageView you can take custom UIButton and assign same image to button and you will get touchupInside event of that button. Just assign button.tag = indexpath.row so you can get which cell's Button pressed.

-(IBAction)ButtonPressed:(id)sender{
     UIButton *btnSelected = sender;
     switch(btnSelected.tag){
       case: 0
       ///Cell 0's Button Pressed. 
       break;
       ......
       ......
}

Hope this help.

To add a touch event to a UIImageView use the following format in your .m

UITapGestureRecognizer *newTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(newTapMethod)];

[_imageButtonName setUserInteractionEnabled:YES];

[_imageButtonName addGestureRecognizer:newTap];

then create the newTapMethod (or what ever you name it)

-(void)newTapMethod{
//...
}

hope that helps.