Question

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    int scrollCount = 0;

    scrollin.text = [NSMutableString stringWithFormat:@"didScroll - %i",scrollCount];

    scrollCount++;
}

Always getting didScroll – 0;
Shouldn’t it inc. as this method gets called when every scroll ends

Answer 1

The scrollCount will be initialized each time the method is called, which means it will always be 0, and therefore display 0. If you want the scrollCount to live forever in your function, you should make it static. You could do something like this:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    static int scrollCount = 0;
    scrollin.text = [NSMutableString stringWithFormat:@"didScroll - %i",scrollCount];
    scrollCount++;
}

This way, the scrollCount will only be initialized once, and it will increment each time the method gets called.

The other way, is to keep track of the scrollCount in some sort of class variable, but that’s bad practice in my opinion, if you will only use it inside a method.