iOS 15系統導航欄適配

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iOS 15的系統導航欄背景默認靜止時隱藏，得頁面能滑動且有內容經過導航欄區域才會顯示...

 

解決方法

iOS 15后，需要手動設置UINavigationBar的scrollEdgeAppearance和standardAppearance屬性才行。

// 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 }

從效果上看的出：

• scrollEdgeAppearance：是處於頂部時的背景
• standardAppearance：是滑動后的背景

更多的自定義效果都可以在對應的UINavigationBarAppearance實例里面設置其屬性。

如果想統一樣式，scrollEdgeAppearance和standardAppearance都設置同一個appearance即可（不設置任何屬性則是默認的毛玻璃效果）：

// 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 }