We have a custom UIApplication object, so our main.swift was
import Foundation
import UIKit
UIApplicationMain(Process.argc, Process.unsafeArgv, NSStringFromClass(MobileUIApplication), NSStringFromClass(AppDelegate))
and that didn't work in Xcode 8 beta 5 so we used this
//TODO Swift 3 workaround? https://forums.developer.apple.com/thread/46405
UIApplicationMain( Process.argc, UnsafeMutablePointer<UnsafeMutablePointer<CChar>>(Process.unsafeArgv), nil, NSStringFromClass(AppDelegate.self))
On Xcode 8 beta 6 we get Use of unresolved identifier 'Process'
What do we need to do in Xcode 8 beta 6/Swift 3 to define the UIApplicationMain?
I write it this way:
UIApplicationMain(
CommandLine.argc,
UnsafeMutableRawPointer(CommandLine.unsafeArgv)
.bindMemory(
to: UnsafeMutablePointer<Int8>.self,
capacity: Int(CommandLine.argc)),
nil,
NSStringFromClass(AppDelegate.self)
)
To change the UIApplication class, substitute NSStringFromClass(MobileUIApplication.self)
for nil
in that formulation.
However, if your only purpose here is to substitute a UIApplication subclass as the shared application instance, there's an easier way: in the Info.plist, add the "Principal class" key and set its value to the string name of your UIApplication subclass, and mark your declaration of that subclass with an @objc(...)
attribute giving it the same Objective-C name.
EDIT This problem is now solved in Swift 4.2. CommandLine.unsafeArgv
now has the correct signature, and one can call UIApplicationMain
easily:
UIApplicationMain(
CommandLine.argc, CommandLine.unsafeArgv,
nil, NSStringFromClass(AppDelegate.self)
)