Add a multiple buttons to a view programmatically, call the same method, determine which button it was

You could either keep a reference to the actual button object somewhere that mattered (like an array) or set the button’s tag to something useful (like an offset in some other data array). For example (using the tag, since this is generally must 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]);
}