The app delegate must implement the window property if it wants to use a main storyboard file

问题:

I'm programmatically implement a list view controller. When I try to run the project, I got error:

2012-11-07 22:46:34.719 myTableViewControl[12021:c07] The app delegate must implement the         window property if it wants to use a main storyboard file. 2012-11-07 22:46:34.722 myTableViewControl[12021:c07] -[AppDelegate setWindow:]:     unrecognized selector sent to instance 0x7674e70 2012-11-07 22:46:34.723 myTableViewControl[12021:c07] *** Terminating app due to uncaught     exception 'NSInvalidArgumentException', reason: '-[AppDelegate setWindow:]: unrecognized     selector sent to instance 0x7674e70' *** First throw call stack: (0x1c8e012 0x10cbe7e 0x1d194bd 0x10df7ea 0x1c7dcf9 0x1c7d94e 0x1d60 0x107b7 0x10da7     0x11fab 0x23315 0x2424b 0x15cf8 0x1be9df9 0x1be9ad0 0x1c03bf5 0x1c03962 0x1c34bb6 0x1c33f44     0x1c33e1b 0x117da 0x1365c 0x1bd2 0x1b05) libc++abi.dylib: terminate called throwing an exception (lldb)  

When I run the code, it hang on the main.m and shows that

"thread1: signal SIGABRT"

@autoreleasepool {return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 

my code is as following: AppDelegate.h

// //  AppDelegate.h //  myTableViewControl // //  Created by Max on 12-11-5. //  Copyright (c) 2012年 Max. All rights reserved. //  #import <UIKit/UIKit.h>  @interface AppDelegate : UIResponder <UIApplicationDelegate>  @property (strong, nonatomic) UINavigationController *navigationController;   @end 

AppDelegate.m

// //  AppDelegate.m //  myTableViewControl // //  Created by Max on 12-11-5. //  Copyright (c) 2012年 Max. All rights reserved. //      #import "AppDelegate.h"     #import "firstViewController.h"   @implementation AppDelegate @synthesize navigationController;   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:    (NSDictionary *)launchOptions {     // create the base window     UIWindow *window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];     window.backgroundColor = [UIColor greenColor];     self.window = window;      [window release];      // this is the home page from the user's perspective      FirstViewController *fvc = [[FirstViewController alloc] init];      UINavigationController *nc = [[UINavigationController alloc]initWithRootViewController:fvc];     self.navigationController = nc;      [fvc release];     [nc release];      // show them     [self.window addSubview: nc.view];     [self.window makeKeyAndVisible];      return YES; }  @end 

FirstViewController is list view controller.

回答1:

You are creating your window as a local variable and then trying to access it as if it were a property by using self.window. Make it a property.

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