未找到 UIApplicationLaunchOptionsKey

Question

UIApplicationDelegate 方法 - application(_:didFinishLaunchingWithOptions:) 显示 Swift 4.2 (Xcode 10) 的错误。

UIApplicationLaunchOptionsKey not found

Swift 4.2 中 UIApplicationLaunchOptionsKey 的替换是什么？

Answer 1

Xcode 会修复它，但 UIApplicationLaunchOptionsKey 被嵌套类型 UIApplication.LaunchOptionsKey.

取代

Answer 2

应该是UIApplication.LaunchOptionsKey，请找下面的apple documentation

Answer 3

'UIApplicationLaunchOptionsKey' has been renamed to 'UIApplication.LaunchOptionsKey'. Replace 'UIApplicationLaunchOptionsKey' with 'UIApplication.LaunchOptionsKey'.

点击错误提示，将显示解决方案：

Answer 4

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

}

Answer 5

我已经尝试了下面的代码片段并为我工作。

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

}

只需在 launchOptions 中提供 UIApplication。 希望它也对你有用。 :)