什么是“需要一个swizzler，使RGB8可以阅读”关于该核心图像给iOS9？

首先，我想了一个解决scheme，但这不是一个好的方法，我会在最后一个。

当我处理在iOS9filter我得到了“需要一个swizzler，使RGB8可以读取”的错误信息，并通过这种方法返回的图像是全黑的

[self.context createCGImage:self.outputImage fromRect:[self.outputImage extent]];

在这里

  - (UIImage *)fliterImage:(UIImage *)input flitername:(NSString *)name { NSString * fliter_name = name; self.context = [CIContext contextWithOptions:nil]; UIImage *image; if ([fliter_name isEqualToString:@"OriginImage"]){ image = input; }else { self.ciImage = [[CIImage alloc] initWithImage:input]; self.filter = [CIFilter filterWithName:fliter_name keysAndValues:kCIInputImageKey,self.ciImage, nil]; [self.filter setDefaults]; self.outputImage = [self.filter outputImage]; // here give the error message self.cgimage = [self.context createCGImage:self.outputImage fromRect:[self.outputImage extent]]; UIImage *image1 = [UIImage imageWithCGImage:self.cgimage]; CGImageRelease(self.cgimage); self.context = [CIContext contextWithOptions:nil]; // // self.filter=[CIFilter filterWithName:@"CIColorControls"]; // _imageView.image=image; // //[self.filter setValue:[CIImage imageWithCGImage:image.CGImage] forKey:@"inputImage"]; image = image1; } return image; } 

这个婴儿车的input是由我的导演编写的这个方法创build的

 -(UIImage *)UIImageFromBmp:(uint8_t**)pixels withPlanesCount:(uint32_t)planeCount { uint8_t *rgb = malloc(sizeof(uint8_t)*1920*1080*3); int step = 1920 * 3; // CSU: YUV420 has 2 kinds of data structure // planeCount==3 --> |yyyyyyyy| // |yyyyyyyy| // |uuuu| // |vvvv| // planeCount==2 --> |yyyyyyyy| // |yyyyyyyy| // |uvuvuvuv| if (planeCount == 3) { for (int rows=0; rows<1080; rows++) { for (int cols=0; cols<1920; cols++) { int y = pixels[0][rows*1920 + cols]; int u = pixels[1][(rows>>1)*960 + (cols>>1)]; int v = pixels[2][(rows>>1)*960 + (cols>>1)]; int r = (int)((y&0xff) + 1.402*((v&0xff)-128)); int g = (int)((y&0xff) - 0.34414*((u&0xff)-128) - 0.71414*((v&0xff)-128)); int b = (int)((y&0xff) + 1.772*((u&0xff)-128)); rgb[rows*step + cols*3 + 0] = MAX(MIN(r, 255), 0); rgb[rows*step + cols*3 + 1] = MAX(MIN(g, 255), 0); rgb[rows*step + cols*3 + 2] = MAX(MIN(b, 255), 0); } } } else if(planeCount == 2) { for (int rows=0; rows<1080; rows++) { for (int cols=0; cols<1920; cols++) { int y = pixels[0][rows*1920 + cols]; int u = pixels[1][(rows>>1)*1920 + ((cols>>1)<<1)]; int v = pixels[1][(rows>>1)*1920 + ((cols>>1)<<1)+1]; int r = (int)((y&0xff) + 1.402*((v&0xff)-128)); int g = (int)((y&0xff) - 0.34414*((u&0xff)-128) - 0.71414*((v&0xff)-128)); int b = (int)((y&0xff) + 1.772*((u&0xff)-128)); rgb[rows*step + cols*3 + 0] = MAX(MIN(r, 255), 0); rgb[rows*step + cols*3 + 1] = MAX(MIN(g, 255), 0); rgb[rows*step + cols*3 + 2] = MAX(MIN(b, 255), 0); } } } else { // CSU: should not happen assert(0); } NSData *data = [NSData dataWithBytes:rgb length:step*1080]; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data); // CSU: Creating CGImage from raw data CGImageRef imageRef = CGImageCreate(1920, //width 1080, //height 8, //bits per component 8 * 3, //bits per pixel step, //bytesPerRow colorSpace, //colorspace kCGImageAlphaNone|kCGBitmapByteOrderDefault,// bitmap info provider, //CGDataProviderRef NULL, //decode false, //should interpolate kCGRenderingIntentDefault //intent ); // CSU: Getting UIImage from CGImage UIImage *finalImage = [UIImage imageWithCGImage:imageRef]; CGImageRelease(imageRef); CGDataProviderRelease(provider); CGColorSpaceRelease(colorSpace); free(rgb); return finalImage; } 

我谷歌它需要一个swizzler，使RGB8可以阅读 ，并意识到它可能是图像格式的原因这个问题。 所以我打电话[self clipImageWithScaleWithsize:_scaledImage.size input:_sourceImage]; 在传递给它之前处理图像

[self.context createCGImage:self.outputImage fromRect:[self.outputImage extent]]; 与此（大小只是图像大小）

 - (UIImage *)clipImageWithScaleWithsize:(CGSize)asize input:(UIImage *)input { UIImage *newimage; UIImage *image = input; if (nil == image) { newimage = nil; } else{ CGSize oldsize = image.size; CGRect rect; if (asize.width/asize.height > oldsize.width/oldsize.height) { rect.size.width = asize.width; rect.size.height = asize.width*oldsize.height/oldsize.width; rect.origin.x = 0; rect.origin.y = (asize.height - rect.size.height)/2; } else{ rect.size.width = asize.height*oldsize.width/oldsize.height; rect.size.height = asize.height; rect.origin.x = (asize.width - rect.size.width)/2; rect.origin.y = 0; } UIGraphicsBeginImageContext(asize); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextClipToRect(context, CGRectMake(0, 0, asize.width, asize.height)); CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]); UIRectFill(CGRectMake(0, 0, asize.width, asize.height));//clear background [image drawInRect:rect]; newimage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); } return newimage; } 

它确实解决了这个问题，但我仍然感到困惑，我不认为这是一个好方法。 什么是“需要一个swizzler，以便RGB8可以读取”真的意味着，为什么我的解决scheme工作？