以编程方式覆盖loadView并设置rootViewController，没有Storyboard

Question

我试图以编程方式创建并设置View作为根View。我没有使用Storyboard或ARC。

我试图设置一个UIWebView作为我的ViewController's根View，这是我无法做到的。当我运行下面的代码时，我看到一个空白屏幕的NavigationBar。我试着设置一个常规的UIView作为根View，并将其背景色设置为蓝色，这会加载，所以问题似乎是特定于UIWebView。 我真的很感激，如果有人能指出我做错了什么。谢谢！

这里是我的loadView代码：

// in GmailOAuthViewController.m 
- (void)loadView { 

    CGRect frame = [[UIScreen mainScreen] bounds]; 
    UIWebView *webView = [[[UIWebView alloc] initWithFrame:frame] autorelease]; 

    self.view = webView; 
} 

这里是我的application:didFinishLaunchingWithOptions:代码：

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

    CGRect frame = [[UIScreen mainScreen] bounds]; 
    UIViewController *viewController = [[GmailOAuthViewController alloc] init]; 
    self.navigationController = [[UINavigationController alloc] initWithRootViewController:viewController]; 

    self.window = [[UIWindow alloc] initWithFrame:frame]; 
    self.window.backgroundColor = [UIColor whiteColor]; 
    self.window.rootViewController = self.navigationController; 
    [self.window makeKeyAndVisible]; 

    return YES; 
} 

Answer 1

如果分配web视图以查看其他一切都是你赋予self.view ... 不见了 尝试

[self.view addSubview: webView]  

这是代码我只是想和它的作品

CGRect frame = [[UIScreen mainScreen] bounds]; 
    UIViewController *viewController = [[ViewController alloc] init]; 
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:viewController]; 

    self.window = [[UIWindow alloc] initWithFrame:frame]; 
    self.window.backgroundColor = [UIColor whiteColor]; 
    self.window.rootViewController = navigationController; 
    [self.window makeKeyAndVisible]; 

在ViewController.m

-(void)viewDidAppear:(BOOL)animated{ 
    CGRect frame = self.view.bounds; 
    UIWebView *webView = [[UIWebView alloc] initWithFrame:frame] ; 
    webView.delegate = self; 
    self.view = webView; 

    NSString *thePath = [[NSBundle mainBundle] pathForResource:@"ViewControllerCatalog" ofType:@"pdf"]; 
    if (thePath) { 
     NSData *pdfData = [NSData dataWithContentsOfFile:thePath]; 
     [(UIWebView *)self.view loadData:pdfData MIMEType:@"application/pdf" 
         textEncodingName:@"utf-8" baseURL:nil]; 
    } 

} 

我很抱歉，我告诉你错在先你实际上分配到查看