错误的接收器类型'CGImageRef'（又名'CGImage *'）

问题描述：

我是一名iOS初学者，并且正在关注How can I manipulate the pixel values in a CGImageRef in Xcode以学习更改CGImages。我改变了一些代码，以便图像中的中间像素应该被涂成红色，而不是交换每个像素的蓝色和红色缓冲区。错误的接收器类型'CGImageRef'（又名'CGImage *'）

但现在我得到的 “坏接收器类型 'CGImageRef'（又名 'CGImage *'）” 的错误在此函数

manipulated = [imageRef colorMiddle];

发送消息：

- (void)renderColorFrame:(CMSampleBufferRef)sampleBuffer 
    { 

CVImageBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); 
CVPixelBufferLockBaseAddress(pixelBuffer, 0); 

size_t cols = CVPixelBufferGetWidth(pixelBuffer); 
size_t rows = CVPixelBufferGetHeight(pixelBuffer); 

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 

unsigned char *ptr = (unsigned char *) CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 0); 

NSData *data = [[NSData alloc] initWithBytes:ptr length:rows*cols*4]; 
CVPixelBufferUnlockBaseAddress(pixelBuffer, 0); 

CGBitmapInfo bitmapInfo; 
bitmapInfo = (CGBitmapInfo)kCGImageAlphaNoneSkipFirst; 
bitmapInfo |= kCGBitmapByteOrder32Little; 

CGDataProviderRef provider = CGDataProviderCreateWithCFData((CFDataRef)data); 

CGImageRef imageRef = CGImageCreate(cols, 
            rows, 
            8, 
            8 * 4, 
            cols*4, 
            colorSpace, 
            bitmapInfo, 
            provider, 
            NULL, 
            false, 
            kCGRenderingIntentDefault); 



//hier image ref verarbeiten!! 
manipulated = [imageRef colorMiddle]; //here 

leftImage = CGImageCreateWithImageInRect(imageRef, CGRectMake(0, 0, self.view.frame.size.width * 6/7, self.view.frame.size.height)); 

rightImage = CGImageCreateWithImageInRect(imageRef, CGRectMake(self.view.frame.size.width/7, 0, self.view.frame.size.width * 6/7, self.view.frame.size.height)); 

    //left image 
_colorImageViewL.image = [[UIImage alloc] initWithCGImage:leftImage/*imageRef*/]; 

    //right image 
_colorImageViewR.image = [[UIImage alloc]initWithCGImage:rightImage/*imageRef*/]; 

//Full 
// _colorImageViewFull.image = [[UIImage alloc]initWithCGImage:imageRef]; 


CGImageRelease(imageRef); 
CGImageRelease(leftImage); 
CGImageRelease(rightImage); 
CGDataProviderRelease(provider); 
CGColorSpaceRelease(colorSpace); 

}

我不不明白为什么我在这里得到这个错误，因为消息应该与匹配参数一起发送：

 @interface ViewController() <AVCaptureVideoDataOutputSampleBufferDelegate> { 

     STSensorController *_sensorController; 

     AVCaptureSession *_avCaptureSession; 
     AVCaptureDevice *_videoDevice; 

     UIImageView *_depthImageView; 
     //UIImageView *_depthImageView2; 
     //UIImageView *_normalsImageView; 

     //Left 
     UIImageView *_colorImageViewL; 

     //right 
     UIImageView *_colorImageViewR; 

     //Full 
     //UIImageView *_colorImageViewFull; 

     uint16_t *_linearizeBuffer; 
     uint8_t *_coloredDepthBuffer; 
     uint8_t *_normalsBuffer; 

     STNormalEstimator *_normalsEstimator; 

     UILabel* _statusLabel; 

     GLKMatrix4 _projection; 

     CGImageRef leftImage; 
     CGImageRef rightImage; 
     CGImageRef manipulated; 




     AppStatus _appStatus; 

    } 

    - (BOOL)connectAndStartStreaming; 
    - (void)renderDepthFrame:(STDepthFrame*)depthFrame; 
    - (void)renderNormalsFrame:(STDepthFrame*)normalsFrame; 
    - (void)renderColorFrame:(CMSampleBufferRef)sampleBuffer; 
    - (void)setupColorCamera; 
    - (void)startColorCamera; 
    - (void)stopColorCamera; 
    - (CGImageRef)colorMiddle:(CGImageRef)image; //here 

@end

有没有人知道什么导致错误，以及如何解决这个问题？我只是想不出任何事情，因为所有使用CGImageRefs的地方都行得通，而且据我所知，这应该是正确的做法。

请仔细看看这个问题的不好看，因为我仍然需要学习如何格式化正确的一切。

在此先感谢！

答

你行：

manipulated = [imageRef colorMiddle];

需要是：

manipulated = [self colorMiddle:imageRef];

colorMiddle:是您ViewController类中的方法。

错误的接收器类型'CGImageRef'（又名'CGImage *'）

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