監(jiān)聽tableVIew的偏移量

1、添加監(jiān)聽

[self.tableView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew context: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];

獲取子控件的Frame

1、section的frame

- (CGRect)rectForSection:(NSInteger)section;

說(shuō)明：包括了header、 footer和其所有cell

2、cell的frame

- (CGRect)rectForRowAtIndexPath:(NSIndexPath *)indexPath;

3、獲取header的frame

- (CGRect)rectForHeaderInSection:(NSInteger)section;

4、獲取footer的frame

- (CGRect)rectForFooterInSection:(NSInteger)section;