Call a method from UIButton subclass #implementation - iphone

Question

I work on a project for iPhone iOS 4 with Xcode 4.
I have subclassed a UIButton so that it intercepts single and double tap.
This is the final part of #implementation of the UIButton subclass, two instance methods where the taps are "recorded";
- (void) handleTap: (UITapGestureRecognizer *) sender {
NSLog(#"single tap");
}
- (void) handleDoubleTap :(UITapGestureRecognizer *) sender {
NSLog(#"double tap");
}
A button instance is created in nib and all works OK: it intercepts single tap and double tap and output the NSLog.
Now the question: I have in my ViewController two methods (resetAllFields and populateAllFields) and I need that single tap execute resetAllFields and double tap execute populateAllFields.
How can I do? Where do I put the call?
Thank you.

Answer 1

If you want to handle the behavior in the ViewController the typical solution is to add a #protocol in your custom button class that defines methods for handling the single and double taps.
i.e. in your CustomButton.h
#protocol CustomButtonDelegate <NSObject>
- (void)button:(CustomButton *)button tappedWithCount:(int)count;
#end
You then have a delegate that implements this protocol in your custom button class and call those methods on the delegate when your taps are detected.
i.e. in your CustomButton.h
id <CustomButtonDelegate> _delegate;
in your methods in the implementation:
- (void) handleTap: (UITapGestureRecognizer *) sender {
NSLog(#"single tap");
[self.delegate button:self tappedWithCount:1];
}
- (void) handleDoubleTap :(UITapGestureRecognizer *) sender {
NSLog(#"double tap");
[self.delegate button:self tappedWithCount:2];
}
Your View Controller than implements the protocol methods and sets itself as the custom button's delegate.
ie. in your ViewControllers implementation
- (void)button:(CustomButton *)button tappedWithCount:(int)count {
if (count == 1) {
[self resetAllFields];
} else if (count == 2) {
[self populateAllFields];
}
}
Since you are using Interface Builder to set the custom button you can assign your view controller as a delegate in there or in the ViewDidLoad.