UI --- Xcode7 模拟器运行时崩溃解决方法

在 AppDelagate.m 文件的第一个方法中添加以下代码:

UIViewController *viewVC = [[UIViewController alloc] init];
viewVC.view.hidden = YES;
self.window.rootViewController = viewVC;
[viewVC release];

整个方法如下:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
UIViewController *viewVC = [[UIViewController alloc] init];
viewVC.view.hidden = YES;
self.window.rootViewController = viewVC;
//从这里开始添加自己的代码
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}

注意:

由于此时创建了一个 UIViewController 对象, 所以在获得 window 视图的所有子视图中, 索引值为0的是, UIViewController 对象.