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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。
Swift: print () vs println () vs NSLog () - Stack Overflow Back in Swift 1 x, print did not add newline characters at the end of the printed string, whereas println did But nowadays, print always adds the newline character at the end of the string, and if you don't want it to do that, supply a terminator parameter of "" NSLog: NSLog adds a timestamp and identifier to the output, whereas print will not
How do I concatenate strings in Swift? - Stack Overflow How to concatenate string in Swift? In Objective-C we do like NSString *string = @"Swift"; NSString *resultStr = [string stringByAppendingString:@" is a new Programming Language"]; or NSString *
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