for...in...  循环  处理一组按钮的选中状态变动

- (void)buttonAction:(UIButton *)button { [_indexView removeFromSuperview];  //下面线条移除 [_tabScrollView setContentOffset:CGPointMake(button.tag * _pageWidth, 0) animated:_transitionAnimated];

//下面两句话更改所有按钮的状态    for (UIButton *tempButton in _tabButtonArray) {        if (button.tag != tempButton.tag) {            [tempButton setSelected:NO];        }    }     [button setSelected:YES]; if(button.selected)    {
               _indexView.frame = CGRectMake(0, tabButton.frame.size.height - 2, tabButton.frame.size.width, 2);            [tabButton addSubview:_indexView];     }

}