UIButton scale on touch?

Question

Can someone tell me how I can scale an UIButton on touch? The button should scale up like 10%.

Thanks in advance!

Answer 1

Call

button.transform = CGAffineTransformMakeScale(1.1,1.1);

In button pressed handler.

Or if you want to scale with animation:

[UIView beginAnimations:@"ScaleButton" context:NULL];
[UIView setAnimationDuration: 0.5f];
button.transform = CGAffineTransformMakeScale(1.1,1.1);
[UIView commitAnimations];

Answer 2

To complete the answer, the button scaling (and resetting) can be placed into methods like so:

// Scale up on button press
- (void) buttonPress:(UIButton*)button {
    button.transform = CGAffineTransformMakeScale(1.1, 1.1);
    // Do something else
}

// Scale down on button release
- (void) buttonRelease:(UIButton*)button {
    button.transform = CGAffineTransformMakeScale(1.0, 1.0);
    // Do something else
}

And connected with the button's events like so:

[btn addTarget:self action:@selector(buttonPress:) forControlEvents:UIControlEventTouchDown];
[btn addTarget:self action:@selector(buttonRelease:) forControlEvents:UIControlEventTouchUpInside];
[btn addTarget:self action:@selector(buttonRelease:) forControlEvents:UIControlEventTouchUpOutside];

NOTE1: Setting the CGAffineTransformMakeScale values to 1.0 does not keep them at their altered values (i.e., it does not multiply 1.1 by 1.0), but rather sets it back to the object's original scale.

NOTE2: Don't forget the colon : in the selector, as it allows the passing of the sender as a parameter to the receiving method. In this case, our methods receive a UIButton and would be declared as such in the interface (.h file).