Question

我收到内存警告3次然后应用程序崩溃。

我有一个滑块需要将模糊值更改为UIImageView图像。我尝试使用dispatch_async并使用imageView.image = nil清理图像内存;但问题没有解决。

来自uislider的代码调用：

dispatch_async(dispatch_get_main_queue(), ^(void)
      {
       imageView.image =nil;
       imageView.image  = [self blurImage:originalImage withValue:value];
      });




-(UIImage *)blurImage:(UIImage *)theImage withValue:(nullable id)value
{
  CIFilter *gaussianBlurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
  [gaussianBlurFilter setDefaults];
  CIImage *inputImage = [CIImage imageWithCGImage:[theImage CGImage]];
  [gaussianBlurFilter setValue:inputImage forKey:kCIInputImageKey];
  [gaussianBlurFilter setValue:value forKey:kCIInputRadiusKey];

  CIImage *outputImage = [gaussianBlurFilter outputImage];
  CIContext *context   = [CIContext contextWithOptions:nil];
  CGImageRef cgimg     = [context createCGImage:outputImage fromRect:[inputImage extent]];
  UIImage *image       = [UIImage imageWithCGImage:cgimg];

  return image;
}

Answer 1

其中一个假设是你没有发布CIImageRef cgimg。这可能会增加内存。

-(UIImage *)blurImage:(UIImage *)theImage withValue:(nullable id)value
{
  CIFilter *gaussianBlurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
  [gaussianBlurFilter setDefaults];
  CIImage *inputImage = [CIImage imageWithCGImage:[theImage CGImage]];
  [gaussianBlurFilter setValue:inputImage forKey:kCIInputImageKey];
  [gaussianBlurFilter setValue:value forKey:kCIInputRadiusKey];

  CIImage *outputImage = [gaussianBlurFilter outputImage];
  CIContext *context   = [CIContext contextWithOptions:nil];
  CGImageRef cgimg     = [context createCGImage:outputImage fromRect:[inputImage extent]];
  UIImage *image       = [UIImage imageWithCGImage:cgimg];
  //Release the core image reference
  CGImageRelease(cgimg)
  return image;
}

收到内存警告目标c

1 个答案: