ios - 在 View Controller 中传递 UIImage 和 Display

Question

嗨，我将图像保存在名为 CaptureManager 的 NSObject 中。在 .h 我设置 UIImage 属性：

@property (nonatomic,strong) UIImage *captureImage;

然后在 .m 中设置图像

       - (void) captureStillImage
{
    AVCaptureConnection *stillImageConnection = [[self stillImageOutput] connectionWithMediaType:AVMediaTypeVideo];

    [[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:stillImageConnection
                                                         completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {

                                                             if (imageDataSampleBuffer != NULL) {
                                                                 NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];

                                                                 captureImage = [[UIImage alloc] initWithData:imageData];

                                                                 [[NSNotificationCenter defaultCenter] postNotificationName: @"photoTaken" object:nil userInfo:nil];
                                                             }

                                                             if ([[self delegate] respondsToSelector:@selector(captureManagerStillImageCaptured:)]) {
                                                                 [[self delegate] captureManagerStillImageCaptured:self];
                                                             }
                                                         }];
}

现在在我的 ViewController 中，我试图像这样显示该图像：

CaptureManager *captureManager = [[CaptureManager alloc] init];

    UIImage *captureBackgroundImage = captureManager.captureImage;

    UIImageView *captureImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
    [captureImageView setImage:captureBackgroundImage];
    [self.view addSubview:captureImageView];
    [self.view bringSubviewToFront:captureImageView];

我做的一切正确吗？问题是我设置了 captureImage 吗？可能是在 captureStillImage 方法中，完成处理程序搞砸了？屏幕上什么也没有显示。任何帮助将非常感激！