erg.m

@interface SSPullToRefreshView ()
@property (nonatomic, weak, readwrite) UIScrollView *scrollView;
@end

@implementation SSPullToRefreshView

@synthesize scrollView = _scrollView;

- (void)setScrollView:(UIScrollView *)scrollView {
	void *context = (__bridge void *)self;
	[self.scrollView removeObserver:self forKeyPath:@"contentOffset" context:context];
	
	_scrollView = scrollView;
	_defaultContentInset = self.scrollView.contentInset;
	[self.scrollView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew context:context];
}

- (void)dealloc {
	self.scrollView = nil;
}


- (void)removeFromSuperview {
	// _scrollView is nil already when this is called so removing the KVO doesn't do anything
	self.scrollView = nil;
	[super removeFromSuperview];
}

@end