UIScrollView初始位置变化的问题

苹果爸爸iOS11废弃了UIViewController的automaticallyAdjustsScrollViewInsets属性导致

处理方案：
统一在appDelegate的didFinishLaunchingWithOptions的最开始增加：

    Swift： if#available(iOS 11.0, *) {UIScrollView.appearance().contentInsetAdjustmentBehavior=.never}


    OC：    if (@available(iOS 11.0, *)) {UIScrollView.appearance.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;}