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iphone - UINavigationController 错误导致我的应用程序崩溃

转载 作者:行者123 更新时间:2023-11-28 23:13:48 25 4
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我正在尝试我的第一个 UINavigationController 应用程序,但它现在崩溃了。如果我注释掉以 navController 开头的行,我不会崩溃,但如果应用程序当然也不起作用。

(注:我的环境是IOS 4.2和Xcode 3.2)

(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

WpglViewController *firstViewController = [[WpglViewController alloc] init];

navController = [[UINavigationController alloc] initWithRootViewController:firstViewController];

[firstViewController release];

[window addSubview:navController.view];

[self.window makeKeyAndVisible];

return YES;
}

这里是崩溃信息。有人能指出我正确的方向吗?谢谢您的帮助。

2011-09-04 07:59:49.309 wpgl[7302:207] -[WpglViewController title]: unrecognized selector sent to instance 0x4b134c0
2011-09-04 07:59:49.313 wpgl[7302:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[WpglViewController title]: unrecognized selector sent to instance 0x4b134c0'
*** Call stack at first throw:

(
0 CoreFoundation 0x00ecdbe9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00cc25c2 objc_exception_throw + 47
2 CoreFoundation 0x00ecf6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x00e3f366 ___forwarding___ + 966
4 CoreFoundation 0x00e3ef22 _CF_forwarding_prep_0 + 50
5 UIKit 0x00375781 -[UINavigationController pushViewController:transition:forceImmediate:] + 743
6 UIKit 0x0036e4a0 -[UINavigationController pushViewController:animated:] + 62
7 UIKit 0x00370d98 -[UINavigationController initWithRootViewController:] + 78
8 wpgl 0x00001df9 -[wpglAppDelegate application:didFinishLaunchingWithOptions:] + 146
9 UIKit 0x002b81fa -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163
10 UIKit 0x002ba55e -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 439
11 UIKit 0x002c4db2 -[UIApplication handleEvent:withNewEvent:] + 1533
12 UIKit 0x002bd202 -[UIApplication sendEvent:] + 71
13 UIKit 0x002c2732 _UIApplicationHandleEvent + 7576
14 GraphicsServices 0x016e4a36 PurpleEventCallback + 1550
15 CoreFoundation 0x00eaf064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
16 CoreFoundation 0x00e0f6f7 __CFRunLoopDoSource1 + 215
17 CoreFoundation 0x00e0c983 __CFRunLoopRun + 979
18 CoreFoundation 0x00e0c240 CFRunLoopRunSpecific + 208
19 CoreFoundation 0x00e0c161 CFRunLoopRunInMode + 97
20 UIKit 0x002b9fa8 -[UIApplication _run] + 636
21 UIKit 0x002c642e UIApplicationMain + 1160
22 wpgl 0x00001d44 main + 102
23 wpgl 0x00001cd5 start + 53
)
terminate called after throwing an instance of 'NSException'

在我的 WpglViewController.h 文件中,我声明了以下内容:

@interface WpglViewController : NSObject <UIApplicationDelegate>

{
UILabel *servingsLabel;
UILabel *quantityLabel;
UINavigationController *navigationController;
}

@property (nonatomic, retain) IBOutlet UILabel *servingsLabel;
@property (nonatomic, retain) IBOutlet UILabel *quantityLabel;
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) UINavigationController *navigationController;

@end

在我的 WpglViewController 中,我声明了以下内容:

#import "WpglViewController.h"

@implementation WpglViewController

@synthesize servingsLabel;
@synthesize quantityLabel;
@synthesize navigationController;

最佳答案

WpglViewController 需要是 UIViewController 的子类。

异常表明 WpglViewController 没有响应它在 UIViewController 中期望的标题方法。

关于iphone - UINavigationController 错误导致我的应用程序崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7299157/

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