Animation 不'；在AppDelegate中显示动画后不显示根viewcontroller

启动应用程序时，我正在尝试在AppDelegate中制作动画。（来自本教程：）

这是我的AppDelegate类：

import UIKit
import QuartzCore

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var mask: CALayer?
    var imageView: UIImageView?

    func application(application: UIApplication!, didFinishLaunchingWithOptions launchOptions: NSDictionary!) -> Bool {
        // Override point for customization after application launch.
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)

        let imageView = UIImageView(frame: self.window!.frame)
        imageView.image = UIImage(named: "Screen")
        self.window!.addSubview(imageView)
        self.mask = CALayer()
        self.mask!.contents = UIImage(named: "twitter logo mask")!.CGImage
        self.mask!.bounds = CGRect(x: 0, y: 0, width: 100, height: 100)
        self.mask!.anchorPoint = CGPoint(x: 0.5, y: 0.5)
        self.mask!.position = CGPoint(x: imageView.frame.size.width/2, y: imageView.frame.size.height/2)
        imageView.layer.mask = mask
        self.imageView = imageView

        animateMask()

        // Override point for customization after application launch.
        self.window!.backgroundColor = UIColor(red: 70/255, green: 154/255, blue: 233/255, alpha: 1)
        self.window!.makeKeyAndVisible()
        UIApplication.sharedApplication().statusBarHidden = true
        return true
    }

    func applicationWillResignActive(application: UIApplication!) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(application: UIApplication!) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(application: UIApplication!) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(application: UIApplication!) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(application: UIApplication!) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }

   func animateMask() {
        let keyFrameAnimation = CAKeyframeAnimation(keyPath: "bounds")
        keyFrameAnimation.delegate = self
        keyFrameAnimation.duration = 1
        keyFrameAnimation.beginTime = CACurrentMediaTime() + 1 //add delay of 1 second
        let initalBounds = NSValue(CGRect: mask!.bounds)
        let secondBounds = NSValue(CGRect: CGRect(x: 0, y: 0, width: 90, height: 90))
        let finalBounds = NSValue(CGRect: CGRect(x: 0, y: 0, width: 1500, height: 1500))
        keyFrameAnimation.values = [initalBounds, secondBounds, finalBounds]
        keyFrameAnimation.keyTimes = [0, 0.3, 1]
        keyFrameAnimation.timingFunctions = [CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut), CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)]
        self.mask!.addAnimation(keyFrameAnimation, forKey: "bounds")
    }

    override func animationDidStop(anim: CAAnimation!, finished flag: Bool) {
        self.imageView!.layer.mask = nil //remove mask when animation completes
    }


}

我假设这一行：

self.window！。makeKeyAndVisible（）

将此动画放在窗口顶部并向用户显示。但在此之后，附加到导航控制器的my root viewcontroller不会加载。我已尝试将此代码放入animationDidStop函数中：

override func animationDidStop(anim: CAAnimation!, finished flag: Bool) {
  self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
  let vc = ViewController(nibName: "ViewController", bundle: nil)
  self.window!.rootViewController = vc
  self.window!.makeKeyAndVisible()
}

但这给了我以下运行时错误：

2014-11-28 00:27:59.452 Test[3124:76510] Application windows are expected to have a root view controller at the end of application launch
2014-11-28 00:28:01.444 Test[3124:76510] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle </Users/MyComp/Library/Developer/CoreSimulator/Devices/0F42DE92-96A1-4D9B-A0D1-F1606FEEB2B4/data/Containers/Bundle/Application/ACAEFA85-9BE9-4C6C-8074-2692691FDA0C/Test.app> (loaded)' with name 'ViewController''
*** First throw call stack:
(
 0   CoreFoundation                      0x0000000108127f35 __exceptionPreprocess + 165
 1   libobjc.A.dylib                     0x0000000109ed9bb7 objc_exception_throw + 45
 2   CoreFoundation                      0x0000000108127e6d +[NSException raise:format(inlove) + 205
 3   UIKit                               0x0000000108ee68c3 -[UINib instantiateWithOwner:options(inlove) + 552
 4   UIKit                               0x0000000108d45f98 -[UIViewController _loadViewFromNibNamed:bundle(inlove) + 242
 5   UIKit                               0x0000000108d46588 -[UIViewController loadView] + 109
 6   UIKit                               0x0000000108d467f9 -[UIViewController loadViewIfRequired] + 75
 7   UIKit                               0x0000000108d46c8e -[UIViewController view] + 27
 8   UIKit                               0x0000000108c65ca9 -[UIWindow addRootViewControllerViewIfPossible] + 58
 9   UIKit                               0x0000000108c66041 -[UIWindow _setHidden:forced(inlove) + 247
 10  UIKit                               0x00000001166c57b0 -[UIWindowAccessibility _orderFrontWithoutMakingKey] + 68
 11  UIKit                               0x0000000108c7272c -[UIWindow makeKeyAndVisible] + 42
 12  Test                                0x0000000107b68ad1 _TFC4Test11AppDelegate16animationDidStopfS0_FTGSQCSo11CAAnimation_8finishedSb_T_ + 1297
 13  Test                                0x0000000107b68b67 _TToFC4Test11AppDelegate16animationDidStopfS0_FTGSQCSo11CAAnimation_8finishedSb_T_ + 71
 14  QuartzCore                          0x0000000108aa87ee _ZN2CA5Layer23run_animation_callbacksEPv + 308
 15  libdispatch.dylib                   0x000000010a6907f4 _dispatch_client_callout + 8
 16  libdispatch.dylib                   0x000000010a6798fb _dispatch_main_queue_callback_4CF + 949
 17  CoreFoundation                      0x000000010808ffe9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
 18  CoreFoundation                      0x0000000108052eeb __CFRunLoopRun + 2043
 19  CoreFoundation                      0x0000000108052486 CFRunLoopRunSpecific + 470
 20  GraphicsServices                    0x000000010c0f09f0 GSEventRunModal + 161
 21  UIKit                               0x0000000108c21420 UIApplicationMain + 1282
 22  Test                                0x0000000107b68efe top_level_code + 78
 23  Test                                0x0000000107b68f3a main + 42
 24  libdyld.dylib                       0x000000010a6c5145 start + 1
 25  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

2014-11-28 00:27:59.452测试[3124:76510]预计应用程序启动结束时，应用程序窗口将有一个根视图控制器
2014-11-28 00:28:01.444测试[3124:76510]***由于未捕获的异常“NSInternalInconsistenceException”而终止应用程序，原因：“无法在捆绑包中加载NIB:“NSBundle（loaded）”，名称为“ViewController”
***第一次抛出调用堆栈：
(
0 CoreFoundation 0x0000000108127f35例外预处理+165
1 libobjc.A.dylib 0x0000000109ed9bb7 objc_异常_抛出+45
2 CoreFoundation 0x0000000108127e6d+[N异常提升：格式（inlove）+205
3 UIKit 0x0000000108ee68c3-[UINib实例化所有者：选项（inlove）+552
4 UIKit 0x0000000108d45f98-[UIViewController\u LoadViewFromNIBname:bundle（inlove）+242
5 UIKit 0x0000000108d46588-[UIViewController loadView]+109
6 UIKit 0x0000000108d467f9-[UIViewController loadViewIfRequired]+75
7 UIKit 0x0000000108d46c8e-[UIViewController视图]+27
8 UIKit 0x0000000108c65ca9-[UIWindow AddRootViewControllerServiceWifPossible]+58
9 UIKit 0x0000000108c66041-[UIWindow\u setHidden:强制（inlove）+247
10 UIKit 0x00000001166c57b0-[UIWindowAccessibility\u OrderFront不带MakingKey]+68
11 UIKit 0x0000000108c7272c-[UIWindow makeKeyAndVisible]+42
12测试0x0000000107b68ad1 \u TFC4Test11AppDelegate16animationDidStopfS0 \u FTGSQCSo11CAAnimation \u 8完成测试+1297
13测试0x0000000107b68b67 TToFC4Test11AppDelegate16animationDidStopfS0 FTGSQCSo11CAAnimation完成
14 QuartzCore 0x0000000108aa87ee _ZN2CA5layer23运行_动画_callbacksEPv+308
15 libdispatch.dylib 0x000000010a6907f4调度客户端调用+8
16 libdispatch.dylib 0x000000010a6798fb_调度_主队列_回调_4CF+949
17 CoreFoundation 0x000000010808ffe9\uuuu CFRUNLOOP\u正在维护\u主\u调度\u队列\uuuu9
18 CoreFoundation 0x0000000108052eeb\uuuu CFRunLoopRun+2043
19 CoreFoundation 0x0000000108052486 CFRunLoopRunSpecific+470
20图形服务0x000000010c0f09f0 GSEventRunModal+161
21 UIKit 0x0000000108c21420 UIApplicationMain+1282
22测试0x0000000107b68efe顶层代码+78
23测试0x0000000107b68f3a干管+42
24 libdyld.dylib 0x000000010a6c5145启动+1
25°？0x0000000000000001 0x0+1
)
libc++abi.dylib:以NSException类型的未捕获异常终止
（lldb）

---

动画结束后如何显示我的根viewcontroller？

我在您的代码中发现了问题

将

self.window！.makeKeyAndVisible（）

从

didFinishLaunchingWithOptions

方法中删除。因为当时不需要它。当我们设置窗口的根视图控制器时，这一行是必需的，所以最好放在

animationDidStop

方法中

从您的代码中，我可以看到您使用了Xib文件来加载视图控制器。因此引发了异常，因为编译器无法为

ViewController

找到Xib

override func animationDidStop(anim: CAAnimation!, finished flag: Bool) {
        self.imageView!.layer.mask = nil //remove mask when animation completes

//********** IF YOU USE STORYBOARD ***********//
//        var mainStoryBoard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
//        var viewController = mainStoryBoard.instantiateViewControllerWithIdentifier("ViewController") as UIViewController

//********** IF YOU USE Xib/Nib ***********//
        var seconViewController = SeconViewController(nibName: "SeconViewController", bundle: NSBundle.mainBundle())

        self.window?.rootViewController = seconViewController
        self.window!.makeKeyAndVisible()
    }

这里我还为故事板编写了代码，如果您想在动画之后从故事板加载视图控制器。只需删除上面的注释部分，并将

viewController

指定为

rootViewController

我已经创建了这个演示。如果你不能理解它

---

你就是那个人！我今晚或明天会试试这个，并将你的答案标记为正确答案。非常感谢！我也有同样的问题，但出于某种奇怪的原因，我在视图控制器显示前不到一秒钟就看到了开始图片/动画。我有与你相同的代码。有人知道它的运行方式吗在打开新的根视图之前，是否将k设置为默认状态？