创建没有笔尖的视图控制器 [英] Creating a view controller without a nib

问题描述

在AppDelegate中，我想创建一个UIViewController子类并添加它的视图。 viw本身将在代码中指定 - 没有笔尖。

In AppDelegate, I want to create a UIViewController subclass and add it's view. The viw itself will be specified in code - there is no nib.

根据苹果文档，我应该使用

Based on the apple docs, I should use

initWithNibName:nil bundle:nil];

然后在控制器的loadView中添加我的子视图等。

and then in loadView of the controller, I add my subviews etc.

但是，下面的测试代码对我不起作用。我在Apple的 PageControl演示上对AppDelegate代码进行了建模，只是因为我的应用程序将实现类似的结构（特别是一个基本控制器来管理分页滚动视图，以及一组其他控制器来构建页面）。

However, the follwing test code below does not work for me. I modelled the AppDelegate code on Apple's PageControl demo, simply because my app will implement a similar structure (specifically a base controller to manage a paged scroll view, and an array of other controller's to build the pages).

但是我怀疑我的AppDelegate代码是问题，因为日志记录证明initWithNibName ::和loadView都会触发。下面的应用程序运行，但屏幕为空白。我希望带有标签的绿色视图。

But I suspect my AppDelegate code is the problem, since logging proves that initWithNibName:: and loadView both fire. The app as below runs, but the screen is blank. I am expecting a green view with a label.

AppDelegate

        - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
    {
        ScrollerController *controller = [[ScrollerController alloc] initWithNibName:nil bundle:nil];
        [self.window addSubview:controller.view];
        [self.window makeKeyAndVisible];
        return YES;
    }

ScrollerController （UIViewController子类）

ScrollerController (the UIViewController subclass)

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

- (void)loadView{
    CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];
    UIView *contentView = [[UIView alloc] initWithFrame:applicationFrame];
    contentView.backgroundColor = [UIColor greenColor];
    self.view = contentView;

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(40, 40, 100, 40)];
    [label setText:@"Label created in ScrollerController.loadView"];
    [self.view addSubview:label];
}

推荐答案

尝试使用：
self.window.rootViewController = controller;
而不是
[self.window addSubview：controller.view];

注意，你还应该 @synthesize window; 并创建它
self.window = [[[UIWindow alloc] initWithFrame：[[UIScreen mainScreen] bounds]] autorelease];

Note, that you should also @synthesize window; and create it self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

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