UIActionSheet执行action

我创建了UIActionSheet，怎么样实现按钮执行删除。

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (event.subtype == UIEventSubtypeMotionShake )
    {
        // Handle shake notification
    UIActionSheet *shakeActionSheet = [[UIActionSheet alloc] initWithTitle:nil
                                                                  delegate:self
                                                         cancelButtonTitle:@"Cancel"
                                                    destructiveButtonTitle:@"Delete"
                                                         otherButtonTitles:nil];

    [shakeActionSheet showInView:self];
    }

    if ([super respondsToSelector:@selector(motionEnded:withEvent:)])
        [super motionEnded:motion withEvent:event];
}