A category on UIScrollView for detecting when content has scrolled to top or bottom.

UIScrollView+Extensions.h

//
//  UIScrollView+Extensions.h
//
//

@interface UIScrollView (Extensions)

/// Returns true if the content has been scrolled all the way to the top (by pulling the content up).
- (BOOL)isScrolledToTop;

/// Returns true if the content has been scrolled all the way to the bottom (by pulling the content down).
- (BOOL)isScrolledToBottom;

@end

UIScrollView+Extensions.m

//
//  UIScrollView+Extensions.m
//
//

#import "UIScrollView+Extensions.h"

@implementation UIScrollView (Extensions)


- (BOOL)isScrolledToTop {
    return (self.contentOffset.y <= [self verticalOffsetToTop]);
}

- (BOOL)isScrolledToBottom {
    return (self.contentOffset.y >= [self verticalOffsetToBottom]);
}


#pragma mark - Utils

- (CGFloat)verticalOffsetToTop {
    CGFloat verticalOffsetTop = self.contentInset.top;
    return -verticalOffsetTop;
}

- (CGFloat)verticalOffsetToBottom {
    CGFloat verticalOffsetBottom = (self.contentSize.height + self.contentInset.bottom - self.bounds.size.height);
    return verticalOffsetBottom;
}

@end