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我的应用程序在没有多任务支持的情况下运行良好。但是当我在 info.plist 中激活它时,每次我在 navigationController 上按一些东西并点击主页按钮时它都会崩溃,然后回到应用程序并再次使用 navigationController。错误消息对我也没有帮助。

当我只希望应用程序在后台什么都不做并返回时,我需要为我的应用程序中的多任务支持做些什么。

遗憾的是,自 Xcode 4.1 -_- 以来,仪器也无法正常工作。

控制台中的错误消息有时是:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CAContextImpl _isCached]: unrecognized selector sent to instance 0x5b783d0'

有时它是一个 EXC_BAD_...在我创建开关的视图中???但前提是我之前点击了主页按钮!如果我只推视图然后返回。单击主页按钮。点击应用程序符号。然后尝试再次推送相同的视图它崩溃。但是当我推送视图时,返回并推送视图,它可以工作。当我在 SpringBoard 中(单击主页按钮)时,它只会崩溃。

编辑:

//AppDelegate class

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

    [window makeKeyAndVisible];
    [self loadHauptmenu];

    return YES;
}

- (void) loadHauptmenu {
    NSLog(@"loading Hauptmenu");
    navigationController = [[UINavigationController alloc] init];

    HauptMenuViewController *hauptMenuController = [[HauptMenuViewController alloc] init];
    [navigationController pushViewController:hauptMenuController animated:NO];
//    [hauptMenuController release]; //tried this as error, but wasn't it

    [window addSubview:navigationController.view];
}



//Main Menu class

- (void) pushNewViewController:(UIViewController*)pushMe {
    NSLog(@"Der aktuelle navigationController ist: %@", self.navigationController);

    [self.navigationController pushViewController:pushMe animated:YES];
}

- (void) pushNewViewWithClassname:(NSString*)classname {
    UIViewController *viewControllerToPush = [[NSClassFromString(classname) alloc] init];
    [self pushNewViewController:viewControllerToPush];
    [viewControllerToPush release];
}


- (IBAction) pushEinstellungen:(id)sender {
    [self pushNewViewWithClassname:@"EinstellungenViewController"];
}


//view class, which gets pushed

- (id) init {
    self = [super init];
    if (self != nil) {
        self.title = @"Einstellungen";
        //self.view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 416)];
        self.view.backgroundColor = MEDILEARN_COLOR;

        self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 416) style:UITableViewStyleGrouped];
        self.tableView.delegate = self;
        self.tableView.dataSource = self;
        self.tableView.allowsSelection = NO;
        self.tableView.backgroundColor = [UIColor clearColor];
        [self.view addSubview:self.tableView];

        self.fragenSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(194, 8, 94, 28)]; //here is an EXC_BAD_...
        [self.fragenSwitch addTarget:self action:@selector(toggleEnabledForFragenSwitch:) forControlEvents:UIControlEventValueChanged];
        [self.fragenSwitch setOn:[[NSUserDefaults standardUserDefaults] boolForKey:@"randFragen"] animated:NO];

        self.antwortenSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(194, 8, 94, 28)];
        [self.antwortenSwitch addTarget:self action:@selector(toggleEnabledForAntwortenSwitch:) forControlEvents:UIControlEventValueChanged];
        [self.antwortenSwitch setOn:[[NSUserDefaults standardUserDefaults] boolForKey:@"randAntworten"] animated:NO];
    }
    return self;
}
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1 回答 1

2

根据您的描述,多任务处理似乎不是问题。这看起来像您的应用程序有错误。您应该尝试追踪并修复它。

默认情况下,您的应用在后台不执行任何操作。

于 2011-07-22T17:21:59.373 回答