Question

我想制作多视图应用程序。我的目标是当程序启动时加载第一个视图控制器，然后按下按钮加载新的标签栏控制器并关闭第一个控制器。我尝试自己，我做了第四步，但当加载标签栏控制器时，它只显示没有任何标签的小标签，旧的控制器不会消失。

这就是我所做的：

SwitchAppelegate

-- Header file --
#import <UIKit/UIKit.h>

@class SwitchClass;

@interface SwitchAppDelegate : NSObject <UIApplicationDelegate> {
    SwitchClass *switchClass;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet SwitchClass *switchClass;

@property (nonatomic, retain, readonly) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, retain, readonly) NSManagedObjectModel *managedObjectModel;
@property (nonatomic, retain, readonly) NSPersistentStoreCoordinator *persistentStoreCoordinator;

- (void)saveContext;
- (NSURL *)applicationDocumentsDirectory;

@end

-- Implementation file --
#import "SwitchAppDelegate.h"

@implementation SwitchAppDelegate


@synthesize window=_window;

@synthesize managedObjectContext=__managedObjectContext;

@synthesize managedObjectModel=__managedObjectModel;

@synthesize persistentStoreCoordinator=__persistentStoreCoordinator;

@synthesize switchClass;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    [self.window addSubview:[switchClass view]];

    [self.window makeKeyAndVisible];
    return YES;
}

SwitchClass

-- Header file --

#import <UIKit/UIKit.h>
@class BlueClass;

@interface SwitchClass : UIViewController {
    BlueClass *blueClass;
}

@property (nonatomic, retain) IBOutlet BlueClass *blueClass;

@end

-- Implementation file --

#import "SwitchClass.h"
#import "BlueClass.h"

@implementation SwitchClass

@synthesize blueClass;

-(void) viewDidLoad {
    BlueClass *blue = [[BlueClass alloc] initWithNibName:@"BlueClass" bundle:nil];
    self.blueClass = blue;

    [self.view insertSubview:blue.view atIndex:0];
    [blue release];

    [super viewDidLoad];
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)dealloc
{
    [blueClass release];
    [super dealloc];
}

BlueClass

-- Header file --

@class RedClass;

@interface BlueClass : UIViewController {
    RedClass *redClass;
}

@property (nonatomic, retain) IBOutlet RedClass *redClass;

-(IBAction) switch: (id) sender;

@end

-- Implementation file --

#import "BlueClass.h"
#import "RedClass.h"

@implementation BlueClass

@synthesize redClass;

-(IBAction) switch: (id) sender {
    RedClass *blue = [[RedClass alloc] initWithNibName:@"RedClass" bundle:nil];
    self.redClass = blue;
//    self.window.rootViewController = self.tabBarController;
    [self.view addSubview:blue.view];
    [blue release];

    [super viewDidLoad];
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)dealloc
{
    [redClass release];
    [super dealloc];
}

RedClass

-- Header file --

#import <UIKit/UIKit.h>

@interface RedClass : UITabBarController {

}

@end

-- Implementation file --

#import "RedClass.h"

@implementation RedClass


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)dealloc
{   
    [super dealloc];
}

Answer 1

首先，在appDelegate中添加了SwitchClass的视图。但SwitchClass是一个UIViewController类而不是UIView。所以你应该把你的SwitchClass添加为rootController，如下所示：

self.window.rootViewController = self.switchClass;

如果我是你，我会使用XCode提供的标签栏模板。它会自动为您完成。

多视图应用问题

1 个答案: