Question

According to image could you please advise me which function use to develop this feature?
i’m not sure, is it implement from UIPopover?
any idea, thank you.

source from Music.app iOS 5 beta 2

Answer 1

You can use a UIGestureRecognizer. Specifically, what you are looking for is a UILongPressGestureRecognizer

You should instantiate one and attach it to the view you would like to track the gesture on:

    UILongPressGestureRecognizer* gestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
    [view addGestureRecognizer:gestureRecognizer];

Then, in your handler method you would do the rest:

- (void)handleGesture:(UILongGestureRecognizer *)recognizer {

     if (recognizer.state == UIGestureRecognizerStateBegan) {    

     } else if (recognizer.state == UIGestureRecognizerStateEnded) {

     }
 }

EDIT: for the popover implementation, have a look at WEPopover