存储在CGImageRef中的对象的潜在泄漏

Question

在Xcode Analyze下运行我的代码我偶然发现了以下块

- (UIImage *)imageWithFilter:(CIFilter *)filter
{
    CIContext *ctx = [CIContext contextWithOptions:nil];
    CGImageRef imageRef = [ctx createCGImage:filter.outputImage fromRect:CGRectMake(0, 0, self.size.width, self.size.height)];
    return [UIImage imageWithCGImage:imageRef];
}

Xcode抱怨潜在的内存泄漏:

到底是怎么回事？我该怎么做呢？

Answer 1

以下看起来像一个修复程序,仍然不确定这是否是保留引用处理此方法的最佳方法？

- (UIImage *)imageWithFilter:(CIFilter *)filter
{
    CIContext *ctx = [CIContext contextWithOptions:nil];
    CGImageRef imageRef = [ctx createCGImage:filter.outputImage fromRect:CGRectMake(0, 0, self.size.width, self.size.height)];
    UIImage *image = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);
    return image;
}