Question

I would like tone able to cut these lines down:

[button0 addGestureRecognizer:longPress];
[button1 addGestureRecognizer:longPress];
[button2 addGestureRecognizer:longPress];
[button3 addGestureRecognizer:longPress];
[button4 addGestureRecognizer:longPress];
[button5 addGestureRecognizer:longPress];
[button6 addGestureRecognizer:longPress];
[button7 addGestureRecognizer:longPress];
[button8 addGestureRecognizer:longPress];
[button9 addGestureRecognizer:longPress];

etc.. all the way to 36!!

Possibly with a loop? But i’m not sure how to do this.

Thanks,
Regards.

Answer 1

You can assign a tag to each button and loop through the buttons using the method viewWithTag.

for (int i = 0; i < 36; i++) {
    UIButton *button = [self.view viewWithTag:i];
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
    [button addGestureRecognizer:longPress];
}

The following screenshot shows where to assign the tag for each button in Interface Builder.

If you have setup IBOutlets for the buttons, you can obtain them using valueForKey: and without the tag:

for (int i = 0; i < 36; i++) {
    NSString *key = [NSString stringWithFormat:@"button%d", i];
    UIButton *button = [self valueForKey:key];
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
    [button addGestureRecognizer:longPress];
}