iPhone – Add multiple buttons to the view to the view, call the same method, determine which button it is

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self < br /> action:@selector(buttonClicked:)
forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Button x" forState:UIControlStateNormal];
button.frame = CGRectMake(100.0, 100.0, 120.0, 50.0);
[view addSubview:button];

for( int i = 0; i <5; i++) {
 UIButton* aButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
 [ aButton setTag:i];
 [aButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
 [aView addSubview:aButton];
}

// then ...

- (void)buttonClicked:(UIButton*)button
{
 NSLog(@"Button %ld clicked.", (long int )[button tag]);
}

I want to programmatically add multiple UIButtons to the view-unknown number of buttons at compile time.

I can make one or more UIButtons like this (in a loop, but shortened for simplicity):

UIButton *button = [ UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self 
 action:@selector(buttonClicked:)
forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Button x" forState :UICon trolStateNormal];
button.frame = CGRectMake(100.0, 100.0, 120.0, 50.0);
[view addSubview:button];

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How do I create a basic UIButton programmatically?

But how to determine in buttonClicked: which button was clicked? If possible, I want to pass label data to identify the button.

You can keep a reference to the actual button object in an important location (such as an array) , Or set the button’s tag to something useful (such as an offset in some other data array). For example (use a label, because this usually must be useful):

for( int i = 0; i <5; i++) {
 UIButton* aButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
 [aButton setTag:i];
 [aButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
 [aView addSubview:aButton];
}

// then ...
 
- (void)buttonClicked:(UIButton*)button
{
 NSLog(@"Button %ld clicked.", (long int)[button tag]);
}