为用于 UITabBarController 的 ViewController 实现 loadView 时 setBackgroundColor 崩溃

Question

我有一个视图控制器，它在 appDelegate.m 中用作 tabBarController （下面的代码片段）

 self.window=[[UIWindow alloc ]initWithFrame:[[UIScreen mainScreen]bounds]];
   UITabBarController *baseTab=[[UITabBarController alloc] init];
   self.feedViewController=[[FeedViewController alloc] init];
self.favViewController=[[FavViewController alloc] init];
    [baseTab.tabBar setTintColor:[UIColor yellowColor] ];
    [baseTab setViewControllers:@[self.feedViewController,self.favViewController]animated:YES];

feedViewController 中的代码贴在下面，当我删除 loadView[= 时，应用 crash 已解决 24=] 来自下面的实现

-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self=[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if(self)
    {
        [self setTitle:@"Feed"];


    }
    return  self;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [self.view setBackgroundColor:[UIColor blueColor]];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)loadView
{
}

请帮助我理解为什么会这样。

Answer 1

在加载视图中调用超级方法

-(void)loadView { [super loadView]; }

希望对你有所帮助，祝你好运