iOS11上废除了automaticallyAdjustsScrollViewInsets
if (@available(iOS 11.0, *)) {
self.mainView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
}else {
self.automaticallyAdjustsScrollViewInsets = NO;
}
iOS11上对滚动视图加入了self-sizeing，默认如果不去实现viewForHeaderInSection就不会调用heightForHeaderInSection
如果不实现上述方法，需要关闭自动估计高度
或者
self.mainView.estimatedRowHeight = 0;
self.mainView.estimatedSectionHeaderHeight = 0;
self.mainView.estimatedSectionFooterHeight = 0;
@https://blog.csdn.net/leonliu070602/article/details/78581278
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