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如何系统地自学 Swift 语言并学会 iOS 开发？ - 知乎 Swift 允许全局编写 Swift 代码，实际上 clang 会自动将代码包进一个模拟 C 的函数中。 Swift 也能够指定入口点，比如 @UIApplicationMain 或 @NSApplicationMain，UIKit 启动后生命周期管理是 AppDelegate 和 SceneDelegate，《 Understanding the iOS 13 Scene Delegate 》这篇有详细介绍。
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ios - How to create a delay in Swift? - Stack Overflow there are possibilities to use gcd for periodic tasks which are described in this article from the apple developer documentation but i would recommend using a NSTimer for that this answer shows how to do exactly that in swift