objective-c - Why won't this code allocate a subView?

Question

This is my code where I'm trying to create a subView... I'm using XCode4 with StoryBoards. The app is crashing on the 2nd line where it is allocating subView with EXC_BAD_ACCESS. vFrame has valid content. What is wrong with this? (I'm using XCode4 with Storyboards, btw).

- (void)viewDidLoad
{
    [super viewDidLoad];

    CGRect vFrame = CGRectMake(60,100,200,200);
    subView = [[UIView alloc] initWithFrame:vFrame];
    subView.backgroundColor = [UIColor redColor];
    [self.view addSubview: subView];
}

UPDATE: definition for subView:

@interface PreferencesViewController : UIViewController  {

    UIView *subView;
}

@property (nonatomic, retain)  UIView *subView;

@end

Answer 1

尝试将您的子视图实例化代码移动到您的主视图的方法 viewWillAppear 中。这保证一切都已初始化。

Answer 2

这真的应该工作。您的视图控制器 (PreferencesViewController) 是否正确分配和初始化？你@synthesize 你的子视图了吗？

虽然没关系，但您可以尝试对 CGRect 使用浮点数（在每个末尾添加 .0）。

Answer 3

问题是 UIViewController 被 farkled...不知道如何，但是一旦它被替换，它就像一个冠军！谢谢大家的回复...