iOS Components and Frameworks: Understanding the Advanced Features of the iOS SDK

Tap Recognizer in Action

The code to set up the tap gesture recognizer is in the viewDidLoad method in the sample app’s view controller.

Now, all that is left to do is something interesting after a tap is received—let’s just present a UIAlertView, as follows:

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 (void)myGestureViewTapped:(UIGestureRecognizer *)tapGestureRecognizer{    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Tap      Received"    message:@"Received tap in myGestureView"    delegate:nil    cancelButtonTitle:@"OK Thanks"    otherButtonTitles:nil];    [alert show];    [alert release];}

Run the project and tap the view. An alert view will be presented, as shown in Figure 22.2.

Figure 22.2 Single tap received.

Try tapping around the outside ...