有时会遇到重写 Main 函数来使用不同的 AppDelegate 或 UIApplication 子类的需求, 这里就来看在 Xcode 10 之后 Main 函数的写法.

直接上代码:

swift
import UIKit

let argv = UnsafeMutableRawPointer(CommandLine.unsafeArgv)
    .bindMemory(to: UnsafeMutablePointer<Int8>?.self,
                capacity: Int(CommandLine.argc))

_ = UIApplicationMain(
    CommandLine.argc,
    argv,
    NSStringFromClass(UIApplication.self),
    NSStringFromClass(AppDelegate.self)
)