@mian的等效代码

import UIKit

func main() {
    UIApplicationMain(
        CommandLine.argc,
        UnsafeMutableRawPointer(CommandLine.unsafeArgv)
            .bindMemory(
                to: UnsafeMutablePointer<Int8>.self,
                capacity: Int(CommandLine.argc)),
        nil,
        NSStringFromClass(AppDelegate.self)
    )
}

@available(iOS 13.0, *)
func sceneMain() {
    UIApplicationMain(
        CommandLine.argc,
        UnsafeMutableRawPointer(CommandLine.unsafeArgv)
            .bindMemory(
                to: UnsafeMutablePointer<Int8>.self,
                capacity: Int(CommandLine.argc)),
        nil,
        NSStringFromClass(AppDelegate.self)
    )
}