如何等待加载ViewController，直到appdelegate函数申请完成

var isRequestCompleted = false

override func viewDidLoad() {
    super.viewDidLoad()
    
    // 循环等待申请完成
    while !((UIApplication.shared.delegate as? AppDelegate)?.isRequestCompleted ?? false) {
        RunLoop.current.run(mode: .default, before: Date.distantFuture)
    }
    
    // 申请完成后执行相应操作
    // ...
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // 进行申请操作
    // ...
    
    // 申请完成后设置标记
    isRequestCompleted = true
    
    return true
}