以編程方式覆蓋loadView並設置rootViewController，沒有Storyboard

Question

我試圖以編程方式創建並設置View作爲根View。我沒有使用Storyboard或ARC。

我試圖設置一個UIWebView作爲我的ViewController's根View，這是我無法做到的。當我運行下面的代碼時，我看到一個空白屏幕的NavigationBar。我試着設置一個常規的UIView作爲根View，並將其背景色設置爲藍色，這會加載，所以問題似乎是特定於UIWebView。 我真的很感激，如果有人能指出我做錯了什麼。謝謝！

這裏是我的loadView代碼：

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

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

    self.view = webView; 
} 

這裏是我的application:didFinishLaunchingWithOptions:代碼：

- (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視圖以查看其他一切都是你賦予self.view ... 不見了 嘗試

[self.view addSubview: webView]  

這是代碼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，我告訴你錯在先你實際上分配到查看