第14月第17天 automaticallyAdjustsScrollViewInsets contentInsetAdjustmentBehavior

1.

automaticallyAdjustsScrollViewInsets

self.edgesForExtendedLayout = UIRectEdgeNone;

 

    if ([self respondsToSelector:@selector(automaticallyAdjustsScrollViewInsets)]){

        self.automaticallyAdjustsScrollViewInsets = NO;

    }

 

 

//如果还是有20px偏移，只能在以下方法设置了
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (_viewModel.pageType == 2) {
        //等级
        _tableView.contentOffset = CGPointMake(0, 0);
        return;
    }

    if (_tableView.contentOffset.y < 0) {
        _tableView.contentOffset = CGPointMake(0, 0);
    }

 ios11

    self.automaticallyAdjustsScrollViewInsets = NO;
    if ([_tableView respondsToSelector:@selector(setContentInsetAdjustmentBehavior:)]) {
        if (@available(iOS 11.0, *)) {
            _tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
        } else {
            // Fallback on earlier versions
        }
    }

 http://www.jianshu.com/p/8440a3d181c9

http://www.jianshu.com/p/75fd23bb5286