Using a UIScrollView and UIViews to call an action when a view appears

Question

I have a long UIScrollView with multiple UIViews in it. How do I grab an action/event (i.e. call a method) when the bottom of the scrollview is reached?

Answer 1

you need to check scrollview delegate method and also set its delegate to listen its delegate methods.

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    float currentEndPoint = scrollView.contentOffset.y + scrollView.frame.size.height;
    if (currentEndPoint >= scrollView.contentSize.height) {
        // end point reached
    }
}

Answer 2

You can check it by, setting up UIScrollViewDelegate for you UIScrollView

- (void)viewDidLoad {
    [super viewDidLoad];
    [scrollview setDelegate:self];
    [scrollview setContentSize:CGSizeMake(scrollview.frame.size.width, 900)];
}

#pragma mark - Scrollview Delegate 
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
    if (scrollView.contentOffset.y+scrollView.frame.size.height==scrollView.contentSize.height) {
        NSLog(@"You are at bottom with contnet goes up :%f",scrollView.contentOffset.y);
    }
}

Hope this help you.