Question

我正在尝试使用新视图切换当前加载的视图。

我有3个xib文件和3组ViewControllerFiles。

RootViewController正确加载，并正确加载HomeViewController。

当前错误的行是

[self.rootViewController.view insertSubview:gameController.view atIndex:1];

**error: request for member 'view' in something not a structure or a union**

如果有人能指出我正确的方向那将是伟大的。我理解如何从根控制器切换视图，但我想从子视图交换/添加视图。如果这有意义吗？

这是根控制器头和实现：

#import <UIKit/UIKit.h>

@class HomeViewController;
@class GameViewController;

@interface RootViewController : UIViewController {
    HomeViewController *homeViewController;
    GameViewController *gameViewController;
}

@property (retain, nonatomic) HomeViewController *homeViewController;
@property (retain, nonatomic) GameViewController *gameViewController;

- (IBAction)showHome:(id)sender;
- (IBAction)showGame:(id)sender;

@end

实施档案：

#import "RootViewController.h"
#import "HomeViewController.h"
#import "GameViewController.h"

@implementation RootViewController

@synthesize homeViewController;
@synthesize gameViewController;

- (void)viewDidLoad {
    homeViewController.rootViewController = self;

    HomeViewController *homeController = [[HomeViewController alloc]    initWithNibName:@"HomeView" bundle:nil];
    self.homeViewController = homeController;   
    [self.view insertSubview:homeController.view atIndex:0];    
    [homeController release];   

    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];    

    if (self.homeViewController.view.superview == nil) {
        self.homeViewController = nil;
    } else {
        self.gameViewController = nil;
}

- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

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

@end

以下是正确加载的主视图文件：

#import <UIKit/UIKit.h>

@class RootViewController;

@interface HomeViewController : UIViewController {  
//GameViewController *gameViewController;
    RootViewController *rootViewController;
}

//@property (retain, nonatomic) GameViewController *gameViewController;
@property (nonatomic, assign) RootViewController *rootViewController;

- (IBAction)showGame:(id)sender;

@end

实施档案：

#import "HomeViewController.h"
#import "RootViewController.h"

@implementation HomeViewController;

@synthesize rootViewController;

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {   
[super viewDidLoad];
}
- (IBAction)showGame:(id)sender{
    GameViewController *gameController = [[GameViewController alloc] initWithNibName:@"GameView" bundle:nil];
    self.rootViewController = gameController;
    [self.rootViewController.view insertSubview:gameController.view atIndex:1];
    [gameController release];   
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];    
    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

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

@end

Answer 1

我对你的评论感到困惑。以下是其他代码段：

- (IBAction)showGame:(id)sender { 
    GameViewController *gameController = [[GameViewController alloc] initWithNibName:@"GameView" bundle:nil]; 
    self.rootViewController = gameController; 
    [self.rootViewController.view insertSubview:gameController.view atIndex:1];         
    [gameController release]; 
}

所以你要将HomeViewController的rootViewController设置为等于gameController。然后你将gameController视图插入到rootViewController的视图中。但是，gameController是rootViewController。我认为你在这里有一个逻辑错误。

Answer 2

幸运的是这很容易解决 - 你忘了包含GameViewController头文件。因此，它不知道GameViewController实例的view属性是什么。

Answer 3

我认为这是你的问题：

- (void)viewDidLoad {

homeViewController.rootViewController = self;

HomeViewController *homeController = [[HomeViewController alloc]  initWithNibName:@"HomeView" bundle:nil];
self.homeViewController = homeController;

在初始化rootViewController之前，您已将homeViewController分配给homeViewController。那时`self.homeViewController'只是空的内存。

对于Iphone如何从当前加载的视图引用根视图控制器，因此可以替换/切换视图

3 个答案: