以下图形代码标记为iOS ARC泄漏

Question

 (UIImage *) cropToSquare:(UIImage *)_image 
 {
if(_image.size.height < _image.size.width)
{
    CGRect drawRect = CGRectMake(0, 0, _image.size.height, _image.size.height); 
    UIGraphicsBeginImageContext(drawRect.size);
    CGContextRef currentContext = UIGraphicsGetCurrentContext();
    CGRect cropArea = CGRectMake (((_image.size.width - _image.size.height)/2), 0, _image.size.height, _image.size.height);
    CGContextTranslateCTM(currentContext, 0.0, _image.size.height);
    CGContextScaleCTM(currentContext, 1.0, -1.0);
    CGContextDrawImage(currentContext, drawRect, CGImageCreateWithImageInRect (_image.CGImage, cropArea));
    UIImage *cropped = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return cropped;
}
else
{
    return _image;
}

}

CGContextDrawImage（currentContext，drawRect，CGImageCreateWithImageInRect（_image.CGImage，cropArea））标记了100％的泄漏。

我自己需要做任何与CG相关的发布吗？

感谢

Answer 1

我相信ARC仅适用于Cocoa对象，它不适用于Core *框架。

要修复泄漏，您需要更改为以下内容：

CGImageRef myImage = CGImageCreateWithImageInRect (_image.CGImage, cropArea);
CGContextDrawImage(currentContext, drawRect, myImage);
CFImageRelease(myImage);

根据图像的大小，这可能是一个非常大的泄漏。