BottomSheetViewController.m

- (void)setupGestureEvent {
    UIPanGestureRecognizer *gesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
    [self.view addGestureRecognizer:gesture];
    [self roundViews];
}

- (void)roundViews {
    self.view.layer.cornerRadius = 10;
    self.view.clipsToBounds = YES;
}

- (void)panGesture:(UIPanGestureRecognizer *)recognizer {
    [self moveViewWithGesture:recognizer];

    if (recognizer.state != UIGestureRecognizerStateEnded) {
        return;
    }
    
    //TODO: implement gesture function
}