objective-c - 应用程序崩溃并显示 "Unable to restore previously selected frame"消息

Question

我不明白为什么该代码会导致应用崩溃。

AppDelegate.h

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    self.rootViewController = [[[RootViewController alloc]init]autorelease];

    [self.window setRootViewController:self.rootViewController];


    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

这是RootViewController.m代码

-(void)loadView
{
    UIView *view = [[UIView alloc]initWithFrame:CGRectMake(10, 10, 10, 10)];
    [view setBackgroundColor:[UIColor lightGrayColor]];
    [self.view addSubview:view];
    [view release];
}

我在调试器中收到该消息

Unable to restore previously selected frame.

Answer 1

loadView 应该设置 View 。当 self.view 为 nil 时调用。现在您正在调用 [self.view addSubview:view]; UIKit 调用 loadView，这会创建无限递归。您应该在此处执行 self.view = view;。