CGImageRef内存泄漏 [英] CGImageRef Memory leak

问题描述

使用此自定义方法返回CGImageRef时发生内存泄漏.我无法正确释放"cgImage"，因为我必须将其返回.我该怎么办?

I'm having a memory leak when using this custom method which returns a CGImageRef. I can't release "cgImage" properly because I have to return it. What chould I do ?

- (CGImageRef)rectRoundedImageRef:(CGRect)rect radius:(int)radius
{
    CGSize contextSize = CGSizeMake(rect.size.width, rect.size.height);     
    CGFloat imageScale = (CGFloat)1.0;
    CGFloat width = contextSize.width;
    CGFloat height = contextSize.height;        
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(NULL, width * imageScale, height * imageScale, 8, 0, colorSpace, kCGImageAlphaPremultipliedLast);
    // Draw ...
    // Get your image
    CGImageRef cgImage = CGBitmapContextCreateImage(context);       
    CGColorSpaceRelease(colorSpace);
    CGContextRelease(context);
    //CGImageRelease(cgImage); //If I release cgImage the app crashes.
    return cgImage;     
}

推荐答案

cgImage由您的方法拥有，您需要将其返回并赋予调用方责任，以通过CFRelease释放它.

cgImage is owned by your method, you need to return it and give responsibility to the caller to release it through CFRelease.

您还可以返回包装在UIImage实例中的CGImage，如下所示:

You can also return the CGImage wrapped inside a UIImage instance, like this:

UIImage *image = [UIImage imageWithCGImage:cgImage];
CFRelease(cgImage); //cgImage is retained by the UIImage above
return image;

这篇关于CGImageRef内存泄漏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！