Question

I’m trying to trim the following code down to a single method. At present, eight identical methods are used to process a tap on eight UIButton instances. Ideally, I’d just like to pass the UIButton as an argument into the @selector so I can avoid needing eight identical methods. I’m struggling with the syntax of passing an argument to a selector. I’d want a handleTap: onButton: method, if possible. At present, there are eight methods (handleTap1 through handleTap8) which do an identical operation, on buttons 1 through 8.

UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(handleTap1:)];
UITapGestureRecognizer *tap2 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(handleTap2:)];
UITapGestureRecognizer *tap3 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(handleTap3:)];
UITapGestureRecognizer *tap4 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(handleTap4:)];
UITapGestureRecognizer *tap5 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(handleTap5:)];
UITapGestureRecognizer *tap6 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(handleTap6:)];
UITapGestureRecognizer *tap7 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(handleTap7:)];
UITapGestureRecognizer *tap8 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(handleTap8:)];
[let1Button addGestureRecognizer: tap1];
[let2Button addGestureRecognizer: tap2];
[let3Button addGestureRecognizer: tap3];
[let4Button addGestureRecognizer: tap4];
[let5Button addGestureRecognizer: tap5];
[let6Button addGestureRecognizer: tap6];
[let7Button addGestureRecognizer: tap7];
[let8Button addGestureRecognizer: tap8];

Here’s an example of one of the methods, obviously I’d like to replace let1Button with a passed-in argument to represent any button.

- (void) handleTap1: (UITapGestureRecognizer *) recognizer
{
    [_box setText: [_box.text stringByAppendingString: [let1Button titleForState: UIControlStateNormal]]];
    [let1Button setUserInteractionEnabled:NO];
    [let1Button setTitleColor: [UIColor blackColor] forState: UIControlStateNormal];

}

Answer 1

UIView(UIButton is a subclass of UIView) has a property view. It is the view the gesture recognizer is attached to

UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget: self action: @selector(handleTap:)];
[let1Button addGestureRecognizer: tap1];

- (void) handleTap: (UITapGestureRecognizer *) recognizer
{
    UIButton *button = (UIButton *)recognizer.view;
    [_box setText: [_box.text stringByAppendingString: [UIButton titleForState: UIControlStateNormal]]];
    [UIButton  setUserInteractionEnabled:NO];
    [UIButton setTitleColor: [UIColor blackColor] forState: UIControlStateNormal];

}