How to detect changes on UIPickerView ?

Question

I want to detect changes of UIPickerView value.

If UIPickerView respond to addTarget i used a code like this:

-(void) valueChange:(id)sender {
change = YES;

} 

UIPickerView *questionPicker = [[UIPickerView alloc] init]; 
[questionPicker addTarget:self action:@selector(valueChange:) forControlEvents:UIControlEventValueChanged];

How can i do same things but in a correct way ? Thanks

Answer 1

If you look at the UIPickerViewDelegate it has:

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

Simply set your picker views delegate and implement this.

Answer 2

UIPickerViewDelegate has pickerView:didSelectRow:inComponent: