iOS 15系统导航栏适配

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iOS 15的系统导航栏背景默认静止时隐藏，得页面能滑动且有内容经过导航栏区域才会显示...

 

解决方法

iOS 15后，需要手动设置UINavigationBar的scrollEdgeAppearance和standardAppearance属性才行。

// OC

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    if (@available(iOS 15.0, *)) { UINavigationBar *navigationBar = [UINavigationBar appearance]; UINavigationBarAppearance *scrollEdgeAppearance = [[UINavigationBarAppearance alloc] init]; scrollEdgeAppearance.backgroundColor = UIColor.redColor; navigationBar.scrollEdgeAppearance = scrollEdgeAppearance; UINavigationBarAppearance *standardAppearance = [[UINavigationBarAppearance alloc] init]; standardAppearance.backgroundColor = UIColor.greenColor; navigationBar.standardAppearance = standardAppearance; } return YES; }

// Swift

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    if #available(iOS 15.0, *) { let navigationBar = UINavigationBar.appearance() navigationBar.scrollEdgeAppearance = { let appearance = UINavigationBarAppearance() appearance.backgroundColor = .red return appearance }() navigationBar.standardAppearance = { let appearance = UINavigationBarAppearance() appearance.backgroundColor = .green return appearance }() } return true }

从效果上看的出：

• scrollEdgeAppearance：是处于顶部时的背景
• standardAppearance：是滑动后的背景

更多的自定义效果都可以在对应的UINavigationBarAppearance实例里面设置其属性。

如果想统一样式，scrollEdgeAppearance和standardAppearance都设置同一个appearance即可（不设置任何属性则是默认的毛玻璃效果）：

// OC

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    if (@available(iOS 15.0, *)) { UINavigationBar *navigationBar = [UINavigationBar appearance]; UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc] init]; navigationBar.scrollEdgeAppearance = appearance; navigationBar.standardAppearance = appearance; } return YES; }

// Swift

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    if #available(iOS 15.0, *) { let navigationBar = UINavigationBar.appearance() let appearance = UINavigationBarAppearance() navigationBar.scrollEdgeAppearance = appearance navigationBar.standardAppearance = appearance } return true }