Question

我将现有项目的应用程序委托修改为默认为标准应用程序委托，并使其在启动后将自定义视图控制器的视图添加到场景中：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    SplashScreenController *controller = [[SplashScreenController alloc] init];
    [self.window addSubview:controller.view];
    return YES;
}

我不明白的是，为什么我的观点不显示？加载后屏幕始终为perma-black，因为我确实可以看到视图确实加载了：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    NSLog(@"View did load.");
}

Answer 1

我很难理解你要做的事情，但看起来你的意思是设置你的窗口的根视图控制器。试试这个：

SplashScreenController *controller = [[SplashScreenController alloc] initWithNibName:@"theNibName" bundle:nil];            
[self.window setRootViewController:controller];

Answer 2

我明白了。我没有在视图控制器中分配窗口，也没有使窗口键和可见。代码应该在委托中如下：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    SplashScreenController *controller = [[SplashScreenController alloc] init];
    [self.window addSubview:controller.view];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

为什么我的UIView不会加载？

2 个答案: