Objective c 以编程方式从XIB-vs-加载覆盖视图，以与UIImagePickerController一起使用

我目前正在为iPhone制作一个摄像头应用程序，我有一个奇怪的现象，我想不出来。我希望你能帮助我理解

在重新创建要传递给UIImagePickerController的覆盖视图时，我已经成功地以编程方式创建了该视图。我所不能做的是在IB中创建带/不带控制器的视图，加载它并成功地将其传递给覆盖指针。如果我通过IB进行操作，则视图不会不透明，并且会完全遮挡相机的视图。我不明白为什么

我在想，当从XIB加载时，可能会指定正常的

视图
指针，因此会覆盖摄影机的视图，但我有一个示例，其中在控制器类中，视图和覆盖视图设置为相等。也许加载顺序正在覆盖指针

我们将不胜感激。。。亲切的问候

这个很好用

    - (void)applicationDidFinishLaunching:(UIApplication *)application {

    // dislodge the MainView from the MainViewController
    //
    MainViewController *aController = [[MainViewController alloc] init]; //WithNibName:@"MainView" bundle:nil];

    aController.sourceType= UIImagePickerControllerSourceTypeCamera;
    aController.delegate= aController;

    aController.showsCameraControls= NO;

    // Programmatically load the MainView from the Nib and assign it as the OverlayView instead
    //
    NSArray* nibViews= [[NSBundle mainBundle] loadNibNamed:@"MainView" owner:aController options:nil];
    UIView* uiView= [nibViews objectAtIndex:0];
    uiView.opaque= NO;
    uiView.backgroundColor= [UIColor clearColor];
    aController.cameraOverlayView= uiView;

    self.mainViewController = aController;
    [aController release];

    mainViewController.view.frame = [UIScreen mainScreen].applicationFrame;

    [window addSubview:[mainViewController view]];
    [window makeKeyAndVisible]; 
}

这不

- (void)applicationDidFinishLaunching:(UIApplication *)application {

    // dislodge the MainView from the MainViewController
    //
    MainViewController *aController = [[MainViewController alloc] initWithNibName:@"MainView" bundle:nil];

    aController.sourceType= UIImagePickerControllerSourceTypeCamera;
    aController.delegate= aController;

    aController.showsCameraControls= NO;
    aController.cameraOverlayView= aController.view;

    self.mainViewController = aController;
    [aController release];

    mainViewController.view.frame = [UIScreen mainScreen].applicationFrame;

    [window addSubview:[mainViewController view]];
    [window makeKeyAndVisible];
}