在 AppDelegate 中动画后不显示根视图控制器
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【中文标题】在 AppDelegate 中动画后不显示根视图控制器【英文标题】：Doesn't show root viewcontroller after animation in AppDelegate 【发布时间】：2014-11-27 23:30:13 【问题描述】：我正在尝试在启动应用程序时在 AppDelegate 中制作动画。 （来自本教程：http://iosdevtips.co/post/88481653818/twitter-ios-app-bird-zoom-animation）
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
我假设这行：self.window!.makeKeyAndVisible() 将此动画放在窗口顶部并显示给用户。但是在此之后，连接到我的导航控制器的根视图控制器不会加载。我试图把这段代码放在 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)
如何在动画后显示我的根视图控制器？
【问题讨论】：
【参考方案1】：我在您的代码中发现了问题。
从didFinishLaunchingWithOptions 方法中删除self.window!.makeKeyAndVisible()。因为当时不需要。当我们设置窗口的根视图控制器时需要此行，所以最好放在animationDidStop方法中。
从您的代码中，我可以看到您使用 Xib 文件来加载视图控制器。因此引发异常，因为编译器无法找到 ViewController 的 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()
如果您想在此动画之后从情节提要加载视图控制器，我还为情节提要编写了代码。只需删除上面的评论部分并将viewController 分配为rootViewController。
我为此创建了演示。如果你无法弄清楚。
Sample Demo
【讨论】：
你就是男人！我将在今晚或明天尝试一下，并将您的答案标记为正确答案。非常非常感谢！ 我有同样的问题，但由于一些奇怪的原因，在显示视图控制器之前，我看到开始图片/动画的时间少于一秒。我有和你一样的代码.. 有没有人知道如何在打开新的根视图之前回到默认状态？以上是关于在 AppDelegate 中动画后不显示根视图控制器的主要内容，如果未能解决你的问题，请参考以下文章
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