Question

我创建了模糊图像，如下所示：

//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];

我已经发布了CGImageRef，但仍然在

处获得内存泄漏

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

我也提到了所有其他相关问题并实现了所提供的答案仍然会导致内存泄漏

使用@autoreleasepool {}并尝试将object设置为nil

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

之前

CGImageRelease(cgimg);

仍显示内存泄漏，说明如下。 ARC已打开，ios版本为6.1和7

负责任的图书馆是：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问题？

感谢您的帮助。

Answer 1

所有Core框架都使用C语言，而不是Objective-C。你必须手动进行内存管理，除非将一些（免费桥接）引用的所有权从Core转移到Objective-C对象，否则ARC将无法帮助你。你真的应该阅读Apple documentation来了解你需要做什么。

简而言之，设置对nil的引用（在C中应为NULL）会留下悬空指针和内存泄漏。

Answer 2

问题在于持续调用

[CIContext contextWithOptions:nil]

我建议您在班级中创建CIContext的属性：

@property (retain, nonatomic) CIContext *context;

并且仅在上下文为零时实例化

if( self.context == nil ) {
    self.context = [CIContext contextWithOptions:nil];
}

CoreImage的内存泄漏

2 个答案: