Xcode 8 beta 6: main.swift won't compile

Question

We have a custom UIApplication object, so our main.swift was

import Foundation
import UIKit

UIApplicationMain(Process.argc, Process.unsafeArgv, NSStringFrom         


        

Answer 1

It seems Process has been renamed to CommandLine in beta 6.

CommandLine

But the type of CommandLine.unsafeArgv is mismatching the second argument of UIApplication, so you may need to write something like this:

CommandLine.unsafeArgv.withMemoryRebound(to: UnsafeMutablePointer.self, capacity: Int(CommandLine.argc)) {argv in
    _ = UIApplicationMain(CommandLine.argc, argv, NSStringFromClass(MobileUIApplication.self), NSStringFromClass(AppDelegate.self))
}

(UPDATE)This mismatching should be considered as a bug. Generally, you'd better send a bug report when you find "this-should-not-be" things, like the third parameter in beta 5. I hope this "bug" will be fixed soon.

---

If you just want to designate your custom UIApplication class, why don't you use Info.plist?

NSPrincipalClass | String | $(PRODUCT_MODULE_NAME).MobileUIApplication

(Shown as "Principal class" in non-Raw Keys/Values view.)

With this in your Info.plist, you can use your MobileUIApplication with normal way using @UIApplicationMain.

(ADDITION) Header doc of UIApplicationMain:

// If nil is specified for principalClassName, the value for NSPrincipalClass from the Info.plist is used. If there is no
// NSPrincipalClass key specified, the UIApplication class is used. The delegate class will be instantiated using init.