Objective-C NSImage，内存泄漏（任何建议）我正在使用 ARC

Question

我该如何修复这个内存泄漏？我有 NSBezierPath 的集合吗？我该如何修复这个内存泄漏？有什么建议吗？我正在使用ARC。

int main(int argc, const char * argv[])
{
    @autoreleasepool {

        // insert code here...
        for(int j=0;j<5000;j++){
            NSLog(@"Hello, World!");
            NSSize imageSize = NSMakeSize(512, 512);
            NSImage *image = [[NSImage alloc] initWithSize:imageSize];
            //draw a line:
            for(int i=0;i<1000;i++){
                [image lockFocus];
                float r1 = (float)(arc4random() % 500);
                float r2 = (float)(arc4random() % 500);
                float r3 = (float)(arc4random() % 500);
                float r4 = (float)(arc4random() % 500);
                [NSBezierPath strokeLineFromPoint:NSMakePoint(r1, r2) toPoint:NSMakePoint(r3, r4)];
            }
            //...

            NSBitmapImageRep *imageRep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:NSMakeRect(0, 0, imageSize.width, imageSize.height)];
            NSData *pngData = [imageRep representationUsingType:NSPNGFileType properties:nil];
            [image unlockFocus];

            NSString *jstring = [NSString stringWithFormat:@"%d", j];
            jstring = [jstring stringByAppendingString:@".png"];
            [pngData writeToFile:jstring atomically:YES];
        }
    }

    return 0;
}

Answer 1

修改后的答案，现在我知道你正在使用 ARC：

这可能不是您正在泄漏，而是您的自动释放池随着循环的每次迭代而变得越来越大，因为在循环完成之前自动释放池不会清空。

您需要做的是在循环内使用辅助自动释放池。这是代码的修订版本来说明这一点。

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        // insert code here...
        for(int j=0; j<5000; j++) {
            NSLog(@"Hello, World!");
            NSSize imageSize = NSMakeSize(512, 512);
            @autoreleasepool {
                NSImage *image = [[NSImage alloc] initWithSize:imageSize];
                //draw a line:
                NSData *pngData;
                for(int i=0;i<1000;i++){
                    [image lockFocus];
                    float r1 = (float)(arc4random() % 500);
                    float r2 = (float)(arc4random() % 500);
                    float r3 = (float)(arc4random() % 500);
                    float r4 = (float)(arc4random() % 500);
                    [NSBezierPath strokeLineFromPoint:NSMakePoint(r1, r2) toPoint:NSMakePoint(r3, r4)];
                    //...

                    NSBitmapImageRep *imageRep = [[NSBitmapImageRep alloc] initWithFocusedViewRect:NSMakeRect(0, 0, imageSize.width, imageSize.height)];
                    pngData = [imageRep representationUsingType:NSPNGFileType properties:nil];
                    [image unlockFocus];
                }

                NSString *jstring = [NSString stringWithFormat:@"%d", j];
                jstring = [jstring stringByAppendingString:@".png"];
                [pngData writeToFile:jstring atomically:YES];
            }
        }
    }

    return 0;
}

不过，您似乎确实还有另一个问题。您正在为文件构建完整路径吗？