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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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See Array Literals in "The Swift Programming Language" Notice that both string literals and the string constant can be used to initialize the array However, since the array type is known the integer constant testStrLength cannot be used in the array initializer
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8 Swift’s nil is not the same as nil in Objective-C In Objective-C, nil is a pointer to a non-existent object In Swift, nil is not a pointer—it is the absence of a value of a certain type Optionals of any type can be set to nil, not just object types NULL has no equivalent in Swift nil is also called nil in Swift Nil has no equivalent
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I want to pause my app at a certain in point In other words, I want my app to execute the code, but then at a certain point, pause for 4 seconds, and then continue on with the rest of the code Ho
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I need to read and write data to from a text file, but I haven't been able to figure out how I found this sample code in the Swift's iBook, but I still don't know how to write or read data import
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