从SKScene演示UIViewController
我试图从SKScene提出一个UIViewController，但是，应用程序崩溃，这里是我的代码：
1-：
UIViewController *vc = self.view.window.rootViewController; helpVC = [[HelpViewController alloc]initWithNibName:@"HelpViewController" bundle:nil]; [vc presentViewController: helpVC animated: YES completion:nil]; 2-
helpVC = [[HelpViewController alloc]initWithNibName:@"HelpViewController" bundle:nil]; SKScene *sks = (SKScene*)helpVC; [self.view presentScene:sks];
在这两种方式我的应用程序崩溃，感谢您的任何帮助
由于：
2014-02-08 16:38:29.119 BrickRacer[13883:70b] -[UIView presentScene:]: unrecognized selector sent to instance 0x10bb7ea50 2014-02-08 16:38:29.122 BrickRacer[13883:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView presentScene:]: unrecognized selector sent to instance 0x10bb7ea50' *** First throw call stack: ( 0 CoreFoundation 0x0000000101fe8795 __exceptionPreprocess + 165 1 libobjc.A.dylib 0x0000000101d4b991 objc_exception_throw + 43 2 CoreFoundation 0x0000000102079bad -[NSObject(NSObject) doesNotRecognizeSelector:] + 205 3 CoreFoundation 0x0000000101fda09d ___forwarding___ + 973 4 CoreFoundation 0x0000000101fd9c48 _CF_forwarding_prep_0 + 120 5 BrickRacer 0x000000010000bb6d -[ViewController viewDidLoad] + 317 6 BrickRacer 0x000000010000b996 -[HelpViewController viewDidLoad] + 54 7 UIKit 0x0000000100971fe4 -[UIViewController loadViewIfRequired] + 562 8 UIKit 0x00000001009721bd -[UIViewController view] + 29 9 UIKit 0x000000010097f03f -[UIViewController viewControllerForRotation] + 54 10 UIKit 0x0000000100977f5f -[UIViewController _visibleView] + 87 11 UIKit 0x0000000100bb7f89 -[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:animation:] + 4550 12 UIKit 0x000000010097c579 -[UIViewController presentViewController:withTransition:completion:] + 4769 13 BrickRacer 0x000000010001c6a9 -[Menu help] + 521 14 BrickRacer 0x000000010001c43a -[Menu touchesBegan:withEvent:] + 554 15 SpriteKit 0x00000001017d8712 -[SKView touchesBegan:withEvent:] + 611 16 UIKit 0x00000001008bba84 -[UIWindow _sendTouchesForEvent:] + 300 17 UIKit 0x00000001008bc633 -[UIWindow sendEvent:] + 988 18 UIKit 0x0000000100895fa2 -[UIApplication sendEvent:] + 211 19 UIKit 0x0000000100883d7f _UIApplicationHandleEventQueue + 9549 20 CoreFoundation 0x0000000101f77ec1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 21 CoreFoundation 0x0000000101f77792 __CFRunLoopDoSources0 + 242 22 CoreFoundation 0x0000000101f9361f __CFRunLoopRun + 767 23 CoreFoundation 0x0000000101f92f33 CFRunLoopRunSpecific + 467 24 GraphicsServices 0x0000000102abe3a0 GSEventRunModal + 161 25 UIKit 0x0000000100886043 UIApplicationMain + 1010 26 BrickRacer 0x000000010000ea93 main + 115 27 libdyld.dylib 0x0000000104ab15fd start + 1 28 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)
不要试图从SKScene直接展示UIViewController ，这打破了MVC模式。 SKScene是View一部分， View不应该对ViewController SKScene了解。
相反，您可以使用NSNotificationCenter通知SKScene的UIViewController它应该提供另一个UIViewController ：
在SKScene的UIViewController ：
- (void)awakeFromNib { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(goToGameOverViewController:) name:@"GoToGameOverViewController" object:nil]; }
。
-(void)goToGameOverViewController:(NSNotification *) notification { // Perform a segue or present ViewController directly //[self performSegueWithIdentifier:@"GameOverSegue" sender:self]; HelpViewController *helpVC = [[HelpViewController alloc]initWithNibName:@"HelpViewController" bundle:nil]; [self presentViewController:helpVC animated: YES completion:nil]; }
。
- (void) dealloc { // If you don't remove yourself as an observer, the Notification Center // will continue to try and send notification objects to the deallocated // object. [[NSNotificationCenter defaultCenter] removeObserver:self]; }
在SKScene ：
- (void)gameOver { [[NSNotificationCenter defaultCenter] postNotificationName:@"GoToGameOverViewController" object:self]; }
你的问题是双重的：
-
将
UIViewController投射到SKScene。
SKScene *sks = (SKScene*)helpVC;
应该在其他场景中进行投射：例如，基元之间，UI基础和CF类之间，或者子类和超类之间（但不应以相反的方式完成）。
长话短说 – 不是在这种情况下（这些类没有共同之处） -
你问你的观点来呈现一个场景 ，而是传递一个viewController ：
[self.view presentScene:sks];
那么，这里发生了什么？
presentScene:认为他们得到一个SKScene对象，因此发送一些消息给sks。 一个消息，sks不明白…崩溃。
如何解决这个问题？
抓住您的呈现视图控制器。
无论是在全球范围内，或只是从应用程序委托抓住你的根视图控制器：
UIViewController *rootVC = [UIApplication sharedApplication].keyWindow.rootViewController; [rootVC presentViewController:yourPresentedVC animated:YES completion:nil];
如果你使用标签栏/导航控制器，你应该抓住他们提供的VC。
尝试
UIViewController *vc = [[UIApplication sharedApplication] keyWindow].rootViewController; helpVC = [[HelpViewController alloc]initWithNibName:@"HelpViewController" bundle:nil]; [vc presentViewController: helpVC animated: YES completion:nil];