CODEWITHSUNDEEP
iphoneobjective-c
yosifz8
yosifz8

Reputation: 561

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 know which cell the image was pressed.

thx

Upvotes: 3

Views: 6074

Answers (4)

Jhaliya - Praveen Sharma
Jhaliya - Praveen Sharma

Reputation: 31722

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 ;
}

Upvotes: 11

Yup.
Yup.

Reputation: 1893

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.

Upvotes: 0

AliSoftware
AliSoftware

Reputation: 32681

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];
}

Upvotes: 2

Deeps
Deeps

Reputation: 4577

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.

Upvotes: 0

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