Objective c iPhone-忽略视图问题

我正在看一些使用ARKIT的增强现实示例。我试图在相机视图的顶部添加一个按钮来关闭它，所以它会转到上一个屏幕。当我尝试关闭视图时，摄影机将关闭并在摄影机快门关闭动画处冻结/停止。（在这一点上，我仍然可以看到按钮，如果我再次按下它，应用程序就会崩溃）

当前设置如下所示：主菜单视图->ARViewController->增强现实控制器。也许有人能告诉我哪里出了问题？或者如果有更简单的方法强制关闭所有视图并显示主菜单

下面是一些代码：

主菜单

if([ARKit deviceSupportsAR])
{
    ARViewController *viewController = [[ARViewController alloc] initWithDataSource:self];
    viewController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
    [self presentModalViewController:viewController animated:YES];
    [viewController release];
}

ARViewController

.h
AugmentedRealityController  *agController;

.m
 - (void)loadView {
self.agController = [[AugmentedRealityController alloc] initWithViewController:self];}

- (void)viewDidAppear:(BOOL)animated 
{
  [agController displayAR];
}

- (void) scanButtonPressed {       //action when button is pressed
    [agController hideAR];     //dismiss camera
    [self dismissModalViewControllerAnimated:YES]; //dismiss current view
}

增强现实控制器

- (void) hideAR {
    [[self locationManager] stopUpdatingHeading];
    [[self locationManager] stopUpdatingLocation];

    [[self accelerometerManager] release];

    [rootViewController dismissModalViewControllerAnimated:YES];
}

// This is needed to start showing the Camera of the Augemented Reality Toolkit.
-(void) displayAR {     
    [rootViewController presentModalViewController:[self cameraController] animated:NO];
    [displayView setFrame:[[[self cameraController] view] bounds]];
}

---

（项目的原始源代码）

不确定它是否能解决您的问题，但您应该尝试只使用DismissModalViewController一次，并且也可以使用

[self dismissModalViewControllerAnimated:YES]; 

希望这将有助于