- iOS15：TableView新属性sectionheadertoppadding

解释：该属性使Section Header多了间隙

解决：

 if(@available(iOS15.0, *)) {       tableView.sectionHeaderTopPadding = 0;    }

- iOS15：Tableview新属性isPrefetchingEnabled

解释：该属性默认开启，会将点击的cell放置在最上方

解决：

if (@available(iOS 15.0, *)) {        tableView.prefetchingEnabled = false;     }

- iOS15：兼容导航

解决：

if (@available(iOS 15.0, *)) {        UINavigationBarAppearance *appearance = [UINavigationBarAppearance new];        appearance.backgroundColor = [UIColor whiteColor];        appearance.titleTextAttributes = textAttributes;        appearance.shadowColor = [UIColor clearColor];     navigationBar.standardAppearance = appearance;        navigationBar.scrollEdgeAppearance = appearance;    }