Question

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self setWindow:[[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease]];

    // Override point for customization after application launch.
    //self.window.backgroundColor = [UIColor whiteColor];

    // Create First view
    FirstViewController *firstViewCTL = [[FirstViewController alloc] init];

    // Create UINavigationController
    UINavigationController *navCTL = [[UINavigationController alloc] init];
    [[navCTL navigationBar] setBarStyle:UIBarStyleBlack];
    [navCTL pushViewController:firstViewCTL animated:NO];
    [firstViewCTL release];

    [[self window] addSubview:navCTL.view];
    [navCTL release];
    [[self window] makeKeyAndVisible];
    return YES;
}

据我所知，添加subview（addSubview :)会保留视图。但是为什么我现在无法释放拥有已保留视图的导航控制器（navCTL）

Answer 1

-addSubview:保留视图，而不是视图控制器。

您可以使用UIWindow的{{1}}属性（iOS 4及更高版本）来保留视图控制器，还可以保存您自己将视图添加为子视图。

rootViewController

为什么我无法释放我添加到窗口的视图的导航控制器

1 个答案: