iPhone - 应用程序总是以空白屏幕启动？
我无法让我的 iPhone 应用程序在启动时显示任何内容。 知道这里出了什么问题吗？
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
HomeViewController *t = [[HomeViewController alloc] init];
[self.window addSubview:t.view];
[self.window makeKeyAndVisible];
// I tried the following in case the problem is my
//view controller but nothing shows up at all
UISegmentedControl *t = [[UISegmentedControl alloc] init];
[self.window addSubview:t];
[self.window makeKeyAndVisible];
}
I can't get my iPhone app to display any of the content on startup.
Any idea what's wrong here?
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
HomeViewController *t = [[HomeViewController alloc] init];
[self.window addSubview:t.view];
[self.window makeKeyAndVisible];
// I tried the following in case the problem is my
//view controller but nothing shows up at all
UISegmentedControl *t = [[UISegmentedControl alloc] init];
[self.window addSubview:t];
[self.window makeKeyAndVisible];
}
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除非您的视图控制器实现了
loadView，否则您应该使用initWithNibName:bundle:从 NIB 文件加载视图。分段控件应使用
initWithItems:进行初始化。您还应该为控件分配一个框架。Unless your view controller implements
loadView, you should load the view from a NIB file withinitWithNibName:bundle:.A segmented control should be initialized with
initWithItems:. You should also assign a frame to the control.