iOS，監(jiān)聽tableVIew的偏移量

1. 添加監(jiān)聽

[self.tableView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNewcontext:nil];

2.監(jiān)聽的處理

• (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context

{

if ([keyPath isEqualToString:@"contentOffset"])

{

    CGPoint offset = [change[NSKeyValueChangeNewKey] CGPointValue];

}

}

3.移除監(jiān)聽

[self.tableView removeObserver:self forKeyPath:@"contentOffset" context:nil];