[英]My view controller doesn't appeared on the screen
I choose Tabbed Application template. 我选择“选项卡式应用程序”模板。 Then I added CoolViewController, but it doesn't appeared on the screen.
然后我添加了CoolViewController,但它没有出现在屏幕上。 What is wrong?
怎么了?
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, nil];
self.window.rootViewController = self.tabBarController;
CoolViewController *coolVC = [[CoolViewController alloc] init];
coolVC.view.frame = CGRectMake(0, 0, 320, 200);
coolVC.view.backgroundColor = [UIColor blackColor];
[self.window addSubview:coolVC.view];
[self.window makeKeyAndVisible];
return YES;
}
@interface CoolViewController : UIViewController
@end
You should not add the CoolViewController to the window but instead to the UITabBarController
. 您不应将CoolViewController添加到窗口,而应添加到
UITabBarController
。
You should end up with something like this: (NOTE:I haven't tried it) 您应该以如下形式结束:(注意:我还没有尝试过)
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
UIViewController *viewController1 = [[FirstViewController alloc] initWithNibName:@"FirstViewController" bundle:nil];
UIViewController *viewController2 = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
self.tabBarController = [[UITabBarController alloc] init];
CoolViewController *coolVC = [[CoolViewController alloc] init];
coolVC.view.frame = CGRectMake(0, 0, 320, 200);
coolVC.view.backgroundColor = [UIColor blackColor];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2,coolVC, nil];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
return YES;
}
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