几句代码完美适配 iOS11

在Appdelegate.m中的didFinishLaunchingWithOptions 方法中添加如下代码，就全局搞定了！

if (@available(ios 11.0,*))
 {
        UIScrollView.appearance.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
        UITableView.appearance.estimatedRowHeight = 0;
        UITableView.appearance.estimatedSectionFooterHeight = 0;
        UITableView.appearance.estimatedSectionHeaderHeight = 0;
 [UITableView appearance].contentInsetAdjustmentBehavior = UIScreenOverscanCompensationNone;
 }