iOS13以后适配

1、UITableView
在appdelegate方法didFinishLaunchingWithOptions添加代码：

if (@available(iOS 15.0,*))
    {
        [UITableView appearance].sectionHeaderTopPadding = 0;
    }

2、UINavigation
在BaseVC中添加：

if (@available(iOS 13.0,*))
    {
        UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init];
        appearance.backgroundColor = [UIColor whiteColor];
        appearance.shadowColor = [UIColor whiteColor];
        appearance.titleTextAttributes = @{NSForegroundColorAttributeName:[UIColor jk_colorWithHexString:@"#333333"],
                                           NSFontAttributeName:[UIFont fontWithName:@"PingFangSC-Medium" size:18]};
        self.navigationController.navigationBar.standardAppearance = appearance;
        self.navigationController.navigationBar.scrollEdgeAppearance = appearance;
    }
    else
    {
        self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName:[UIColor jk_colorWithHexString:@"#333333"],
                                                   NSFontAttributeName:[UIFont fontWithName:@"PingFangSC-Medium" size:18]};
        [self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
        self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
        self.navigationController.navigationBar.barTintColor = [UIColor whiteColor];
    }

3、UITabBar

if (@available(iOS 15.0,*))
    {
        UITabBarAppearance *appearance = [[UITabBarAppearance alloc] init];
        appearance.shadowColor = [UIColor clearColor];
        appearance.backgroundColor = [UIColor whiteColor];
        [UITabBar appearance].scrollEdgeAppearance = appearance;
        [UITabBar appearance].standardAppearance = appearance;
    }