Objective c 从UIImageView获取UIImage

目前我正在开发一款基于摄像头的应用程序。我在UIImageView中添加了摄像头图像，以便于操作。现在我想增加一些核心成像的效果。我能从视图中得到一个图像吗

这就是我添加效果的方式，但它仅适用于图像

NSString *filePath =
[[NSBundle mainBundle] pathForResource:@"IpadIcon" ofType:@"png"];
NSURL *fileNameAndPath = [NSURL fileURLWithPath:filePath];

CIImage *beginImage =
[CIImage imageWithContentsOfURL:fileNameAndPath];
CIContext *context = [CIContext contextWithOptions:nil];

CIFilter *filter = [CIFilter filterWithName:@"CISepiaTone" keysAndValues: kCIInputImageKey, beginImage, @"inputIntensity", [NSNumber numberWithFloat:0.8], nil];
CIImage *outputImage = [filter outputImage];

CGImageRef cgimg =
[context createCGImage:outputImage fromRect:[outputImage extent]];
UIImage *newImg = [UIImage imageWithCGImage:cgimg];

[captureImage setImage:newImg];

获取图像

- (void) capImage { //method to capture image from AVCaptureSession video feed
    AVCaptureConnection *videoConnection = nil;
    for (AVCaptureConnection *connection in stillImageOutput.connections) {

        for (AVCaptureInputPort *port in [connection inputPorts]) {

            if ([[port mediaType] isEqual:AVMediaTypeVideo] ) {
                videoConnection = connection;
                break;
            }
        }

        if (videoConnection) {
            break;
        }
    }


    [stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) {

        if (imageSampleBuffer != NULL) {
            NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
            [self processImage:[UIImage imageWithData:imageData]];
        }
    }];
}

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使用UIImageView的

image

属性获取图像：

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UIImage*theImage=imageView.image
您能更具体地说明您遇到的问题吗？UIImageView中有一张图片。现在我需要把它拿出来。可能吗？
UIImage*theImage=imageView.image？我现在觉得自己很愚蠢。你能把它写在纸上吗？这样我就可以给你评分了