UIPickerView, detect “rolling wheel” start and stop?

Question

I just discovered that if I do the following:

1. Click the button that animates a UIPickerView into my view
2. Quickly start the wheel rolling

Answer 1

You can use a SwipeGestureRecognizer on the picker. I assume this is not a perfect solution at all.

- (void)viewDidLoad
{
    [super viewDidLoad];

    _pickerSwipeGestureRecognizer.delegate = self;
    [_pickerSwipeGestureRecognizer setDirection:(UISwipeGestureRecognizerDirectionDown | UISwipeGestureRecognizerDirectionUp)];
}

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
    if([gestureRecognizer isEqual:_pickerSwipeGestureRecognizer]){
        NSLog(@"start");
    }
}

- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    NSLog(@"end");
}