iOS UITabBarController问题

Question

刚开始iOS开发时，我得到了在选项卡1（第二个选项卡）中使用TableViewController创建UITabBarController时的崩溃。

这里是我的代码 - AppDelegate.m：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
diseases = [NSMutableArray arrayWithCapacity:5]; 
     Disease *disease1 = [[Disease alloc] init]; 
     Disease *disease2 = [[Disease alloc] init]; 
     Disease *disease3 = [[Disease alloc] init]; 
     Disease *disease4 = [[Disease alloc] init]; 
     Disease *disease5 = [[Disease alloc] init]; 

     disease1.name = @"disease1"; 
     disease2.name = @"disease2"; 
     disease3.name = @"disease3"; 
     disease4.name = @"disease4"; 
     disease5.name = @"disease5"; 

     [diseases addObject:disease1]; 
     [diseases addObject:disease2]; 
     [diseases addObject:disease3]; 
     [diseases addObject:disease4]; 
     [diseases addObject:disease5]; 


UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController; 

UINavigationController *navigationController = 
[[tabBarController viewControllers] objectAtIndex:0]; 

FirstViewController *firstViewController = [[FirstViewController alloc] initWithNibName:@"NormalBiopsy" bundle:nil]; 
firstViewController = [[tabBarController viewControllers] objectAtIndex:0]; 

DiseaseTableViewController *diseaseTableViewController = [[DiseaseTableViewController alloc] initWithNibName:@"DiseaseTableViewController" bundle:nil]; 
diseaseTableViewController = [[tabBarController viewControllers] objectAtIndex:1]; 

SecondViewController *secondViewController = [[SecondViewController alloc] 
               initWithNibName:@"TestYourSelf" bundle:nil]; 
secondViewController = [[tabBarController viewControllers] objectAtIndex:2]; 

ThirdViewController *thirdViewController = [[ThirdViewController alloc] initWithNibName:@"About" bundle:nil]; 
thirdViewController = [[tabBarController viewControllers] objectAtIndex:3]; 

// Override point for customization after application launch. 
return YES; 
} 

这导致与在DiseaseTableViewController的TableView中空白表的UITabBarController - 因为填充任何数据。 但是，如果我做

diseaseTableViewController.diseases = diseases; 

应用程序崩溃与：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-    [UINavigationController setDiseases:]: unrecognized selector sent to instance 

于是，我就添加diseaseTableViewController到navigationController：

diseaseTableViewController = [[navigationController viewControllers] objectAtIndex:1]; 

导致：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[FirstViewController viewControllers]: unrecognized selector sent to instance 

我尝试在该类实现中填充DiseaseTableViewController而不是AppDelegate，但在UI中再次以空白表格结束。

任何想法？

Answer 1

我解决了这个由离开原来的AppDelegate为是，而在viewDidLoad中填充DiseaseController.diseases的数据（）有点像什么@Zhang提到

Answer 2

嗯，不知道我是否正确理解你的问题，但基本上从我的理解你想创建一个带有标签栏界面的应用程序，每个标签都可以有自己的导航？

你可能想是这样的应用程序结构：

AppDelegate 
| 
| 
|___ UITabBarController 
    | 
    |__ UINavigationController1 
    | | 
    | |__ DiseaseController1 
    | 
    | 
    | 
    |__ UINavigationController2 
    | | 
    | |__ DiseaseController2 
    | 
    | 
    | 
    |__ UINavigationController3 
    | | 
    | |__ DiseaseController3 
    | 
    | 
    | 
    | 
    |__ UINavigationController4 
    | | 
    | |__ DiseaseController4 
    | 
    | 
    | 
    | 
    |__ UINavigationController5 
     | 
     |__ DiseaseController5 

所以下面这个结构，你会：

1. 创建和设置您的UITabBarController，你根本控制器为AppDelegate中
2. 创建您的UINavigationController将它们设置为您的UITabBarController的每个选项卡
3. 将匹配的DiseaseViewController添加到ea你的UINavigationController的

当你处理表时，你需要记住设置表的数据源和委托。那么，哪曾DiseaseViewController您在创建表

，你需要做的是这样的：

myTable.source = self; 
myTable.delegate = self; 

凡自指DiseaseViewController您创建的表中如

// psuedocode 
@class Disease1 
{ 
    UITableView myTable; 
} 

@property (nonatomic, retain) UITableView myTable; 

@end 

// implementation code 
@implementation Disease1 

-(void)viewDidLoad() 
{ 
    . . . 
    myTable.source = self; 
    myTable.delegate = self; 
    . . . 
} 

@end