UITapGestureRecognizer

john love · 01-20-2012, 09:59 AM

Taking the lead from Apple's ScrollSuite component, TapToZoom, the call to:

Code:

    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                         initWithTarget:self
                                         action:@selector(handleDoubleTap:)];
   // ...

   [myView addGestureRecognizer:doubleTap];

should be in UIViewController's -loadView.

However, Apple's example had only one UIView controlled by UIViewController ... and I have many sub-views. So, I placed the above UITapGestureRecognizer call in my -viewDidLoad as such

Code:

    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                         initWithTarget:self
                                         action:@selector(handleDoubleTap:)];
   // ...

   [self.view addGestureRecognizer:doubleTap];

Okay, the Console states this call happens; but the Console also states that the call to the selector, handleDoubleTap:, never happens (using the IPad Simulator).

Does anyone have an idea here??

mer10 · 01-20-2012, 10:24 AM

Quote:

Originally Posted by john love

Taking the lead from Apple's ScrollSuite component, TapToZoom, the call to:

Code:

    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                         initWithTarget:self
                                         action:@selector(handleDoubleTap:)];
   // ...

   [myView addGestureRecognizer:doubleTap];

should be in UIViewController's -loadView.

However, Apple's example had only one UIView controlled by UIViewController ... and I have many sub-views. So, I placed the above UITapGestureRecognizer call in my -viewDidLoad as such

Code:

    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                         initWithTarget:self
                                         action:@selector(handleDoubleTap:)];
   // ...

   [self.view addGestureRecognizer:doubleTap];

Okay, the Console states this call happens; but the Console also states that the call to the selector, handleDoubleTap:, never happens (using the IPad Simulator).

Does anyone have an idea here??

Try making the viewcontroller the delegate (UIGestureRecognizerDelegate).

Duncan C · 01-20-2012, 01:29 PM

Quote:

Originally Posted by john love

Taking the lead from Apple's ScrollSuite component, TapToZoom, the call to:

Code:

    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                         initWithTarget:self
                                         action:@selector(handleDoubleTap:)];
   // ...

   [myView addGestureRecognizer:doubleTap];

should be in UIViewController's -loadView.

However, Apple's example had only one UIView controlled by UIViewController ... and I have many sub-views. So, I placed the above UITapGestureRecognizer call in my -viewDidLoad as such

Code:

    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc]
                                         initWithTarget:self
                                         action:@selector(handleDoubleTap:)];
   // ...

   [self.view addGestureRecognizer:doubleTap];

Okay, the Console states this call happens; but the Console also states that the call to the selector, handleDoubleTap:, never happens (using the IPad Simulator).

Does anyone have an idea here??

Your code is is going to add the tap gesture recognizer to the view controller's content view. Taps will happen anywhere in your view controller that isn't covered by an object that handles tap events.

What do you mean that the console "sates that this call happens." What console message?

Does your view controller have a handleDoubleTap: method (that takes a parameter)? Have you added a log statement to your handleDoubleTap method?