使用未声明的类型'UIApplicationLaunchOptionsKey'

Question

最近将一个项目转换为Swift 2.2并运行以前不存在的问题。我试过寻找一种解决方法，但没有发现任何类似的帖子。

使用未声明的类型'UIApplicationLaunchOptionsKey'。

我无法分辨AppDelegate.swift中此代码的错误：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    //UIToolbar.appearance().tintColor = UIColor.clearColor()

    return true
}

Answer 1

尝试将方法签名更改为

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
    return true
}

签名在swift 3

中修改为func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool

Answer 2

在Swift 3中，方法更改为：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
return true

}