ios - CoreImage 的内存泄漏

Question

我创建了如下模糊图像:

//Blur the UIImage
CIImage *imageToBlur = [CIImage imageWithCGImage:viewImage.CGImage];
CIFilter *gaussianBlurFilter = [CIFilter filterWithName: @"CIGaussianBlur"];
[gaussianBlurFilter setValue:imageToBlur forKey: @"inputImage"];
[gaussianBlurFilter setValue:[NSNumber numberWithFloat: 2] forKey: @"inputRadius"];
CIImage *resultImage = [gaussianBlurFilter valueForKey: @"outputImage"];
CIImage *finalImage = [resultImage imageByCroppingToRect:CGRectMake(0, 10, self.view.bounds.size.width, self.view.bounds.size.height)];

//create UIImage from filtered image
UIImage *blurrredImage = [[UIImage alloc] initWithCIImage:finalImage];

CIFilter *colorMatrixFilter = [CIFilter filterWithName:@"CIColorMatrix"];
[colorMatrixFilter setDefaults];
[colorMatrixFilter setValue:finalImage forKey:kCIInputImageKey];
[colorMatrixFilter setValue:[CIVector vectorWithX:0.25 Y:0 Z:0 W:0] forKey:@"inputRVector"];
[colorMatrixFilter setValue:[CIVector vectorWithX:0 Y:0.35 Z:0 W:0] forKey:@"inputGVector"];
[colorMatrixFilter setValue:[CIVector vectorWithX:0 Y:0 Z:0.4 W:0] forKey:@"inputBVector"];
[colorMatrixFilter setValue:[CIVector vectorWithX:0 Y:0 Z:0 W:1] forKey:@"inputAVector"];

// Get the output image recipe
CIImage *outputImage = [colorMatrixFilter outputImage];

// Create the context and instruct CoreImage to draw the output image recipe into a CGImage
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]];
blurrredImage = [UIImage imageWithCGImage:cgimg];


CGImageRelease(cgimg);

//Place the UIImage in a UIImageView
UIImageView *newView = [[UIImageView alloc] initWithFrame:self.view.bounds];
newView.image = blurrredImage;

//insert blur UIImageView below transparent view inside the blur image container
[blurContainerView insertSubview:newView belowSubview:transparentView];

我已经释放了 CGImageRef，但仍然在

处发生内存泄漏

CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]];

我还提到了所有其他相关问题，并实现了提供的答案仍然出现内存泄漏

使用@autoreleasepool { } 并尝试将对象设置为nil

context = nil;
outputImage = nil;
gaussianBlurFilter = nil;
viewImage = nil;

之前

CGImageRelease(cgimg);

仍然显示内存泄漏，描述如下。 ARC开启，ios版本为6.1和7

负责的图书馆是:CoreImage 负责的调用者是:CI::GLESContext::program_for_name(__CFString const*)

有人可以建议我如何解决这个内存泄漏吗？

提前感谢您的帮助。

Answer 1

所有核心框架都使用 C 语言，而不是 Objective-C。您必须手动进行内存管理，并且 ARC 不会在那里帮助您很多，除非将某些(免费桥接)引用的所有权从 Core 转移到 Objective-C 对象。你真的应该阅读 Apple documentation了解您需要做什么。

不过，简而言之，设置对 nil 的引用(在 C 语言中应该是 NULL)会给您带来悬空指针和内存泄漏。