iOS11&IPhoneX适配(2)

1、iOS11 scrollview 显示时会有滚动效果

消除的方法：
if ([self.tableView respondsToSelector:@selector(setContentInsetAdjustmentBehavior:)]) {
    if (@available(iOS 11.0, *)) {
        self.tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    } else {
        // Fallback on earlier versions
    }
}