CGContextDrawPDFPage泄漏100%

Question

我试着用CoreGraphics绘制一个pdf，一切正常，但在仪器上有一个100%的泄漏: CGContextDrawPDFPage(ctx，page2)；我用CGPDFDocumentRelease()释放；每次我使用CGPDFDocumentCreateWithURL()；有什么解决方案来释放: CGContextDrawPDFPage？

  - (void)drawRect:(CGRect)rect
        {
        if (state == 0) {
        CGContextRef ctx = UIGraphicsGetCurrentContext();
        CGContextSaveGState(ctx);
        [[UIColor whiteColor] set];
        CGContextFillRect(ctx, CGRectMake(0, 0, rect.size.width, rect.size.height));
        CGContextGetCTM(ctx);
        CGContextScaleCTM(ctx, 1, -1);
        CGContextTranslateCTM(ctx, 45, -rect.size.height);
        CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL(((CFURLRef)url));
        CGPDFPageRef page = CGPDFDocumentGetPage(pdf, currentPage);
        CGRect mediaRect = CGPDFPageGetBoxRect(page, kCGPDFCropBox);
        CGContextScaleCTM(ctx, (678) / mediaRect.size.width,
        (rect.size.height )  / (mediaRect.size.height));
        CGContextSetInterpolationQuality(ctx, kCGInterpolationHigh);
        CGContextSetRenderingIntent(ctx, kCGRenderingIntentDefault);
        CGContextDrawPDFPage(ctx, page);
        CGPDFDocumentRelease(pdf);
        CGContextRestoreGState(ctx);
        }
        else
        {
        CGContextRef ctx = UIGraphicsGetCurrentContext();
        CGContextSaveGState(ctx);
        [[UIColor whiteColor] set];
        CGContextFillRect(ctx, CGRectMake(0, 0, rect.size.width, rect.size.height));

        CGContextGetCTM(ctx);
        CGContextScaleCTM(ctx, 1, -1);

        CGContextTranslateCTM(ctx, 6, -rect.size.height);

        CGPDFDocumentRef pdf = CGPDFDocumentCreateWithURL(((CFURLRef)url));
        CGPDFPageRef page = CGPDFDocumentGetPage(pdf, currentPage);


        CGRect mediaRect = CGPDFPageGetBoxRect(page, kCGPDFCropBox);
        CGContextScaleCTM(ctx, (497) / mediaRect.size.width,
        (rect.size.height )  / (mediaRect.size.height));

        // draw it
        CGContextSetInterpolationQuality(ctx, kCGInterpolationHigh);
        CGContextSetRenderingIntent(ctx, kCGRenderingIntentDefault);
        CGContextDrawPDFPage(ctx, page);
        CGPDFDocumentRelease(pdf);
        CGContextRestoreGState(ctx);

        //

        CGContextSaveGState(ctx);

        CGContextGetCTM(ctx);
        CGContextScaleCTM(ctx, 1, -1);

        CGContextTranslateCTM(ctx, 506, -rect.size.height);

        CGPDFDocumentRef pdf2 = CGPDFDocumentCreateWithURL(((CFURLRef)url));
        CGPDFPageRef page2 = CGPDFDocumentGetPage(pdf2, (currentPage + 1));



        CGContextScaleCTM(ctx, (497) / mediaRect.size.width,
        (rect.size.height )  / (mediaRect.size.height));

        CGContextSetInterpolationQuality(ctx, kCGInterpolationHigh);
        CGContextSetRenderingIntent(ctx, kCGRenderingIntentDefault);
        //Leak 100%
        CGContextDrawPDFPage(ctx, page2);
        CGPDFDocumentRelease(pdf2);
        CGContextRestoreGState(ctx);
        }
    }

我也不知道为什么。有什么想法吗？这是我的应用程序中唯一的漏洞:(我看不出漏洞来自哪里:s

PS : state =0=纵向state =1=横向，所以我在横向绘制了2页。

Answer 1

看起来你没有释放你从CGPDFDocumentGetPage得到的CGPDFPageRef实例。

CGPDFPageRelease(page);

将其添加到适当位置的页面和page2中。