pull to dismiss

gistfile1.txt

#pragma mark - UITableViewDelegate delegate

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (scrollView.contentOffset.y < -160.0f){
        dispatch_once(&pullToDismissLock, ^{
            
            CGRect destFrame = self.notificationsTableView.frame;
            destFrame.origin.y = destFrame.size.height;
            
            [UIView animateWithDuration:0.4f delay:0.0f options:UIViewAnimationOptionCurveEaseOut animations:^{
                self.notificationsTableView.frame = destFrame;
                self.notificationsTableView.alpha = 0.0f;
                
            } completion:^(BOOL finished) {
                if ([self.delegate respondsToSelector:@selector(notificationsViewController:shouldDismissView:)]){
                    [self.delegate notificationsViewController:self shouldDismissView:YES];
                }
            }];
            
            double delayInSeconds = 1.2;
            dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
            dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
                dispatch_async(dispatch_get_main_queue(), ^{
                    pullToDismissLock = 0;
                });
            });
            
        });
    }
}