ios - 使用 CoreGraphics 创建多页 PDF 文件在控制台上显示错误

Question

我在创建多页 PDF 时遇到问题。我正在使用 NSMutableData 来存储 PDF 数据。当我使用以下代码绘制新页面时

CGContextSetRGBFillColor(context, 0.0, 0.0, 0.0, 1.0);
**    Error Line   **

UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 595, 841), 零);

[self drawPageAtIndex:self.numberOfPages+1 inRect:CGRectMake(0, 0, pageWidth, pageHeight)];
[self drawBorder];//draws Border to the page

它在控制台上显示以下错误

<Error>: replacing +/-infinity with -2147483648.
<Error>: replacing +/-infinity with 2147483647.
<Error>: replacing +/-infinity with -2147483648.
<Error>: replacing +/-infinity with 2147483647.
<Error>: replacing +/-infinity with -2147483648.
<Error>: replacing +/-infinity with 2147483647.
<Error>: replacing +/-infinity with -2147483648.
<Error>: replacing +/-infinity with 2147483647.

请有人帮我解决这个错误。

Here is the link which i reffered previously for the same error

它说核心图形日志的值变得令人困惑，但我没有得到错误的解决方案谢谢。

Answer 1

我可以重现错误并显然修复它。自 2013 年以来，我在 App Store 上有一个应用程序。该应用程序创建了一些 PDF 文件，并且该错误在 iOS 10 中首次显示。

我追踪到了这个片段

    NSString* pgStr = [some text];            UIFont* theFont = [some font];    NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle defaultParagraphStyle] mutableCopy];    paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;    paragraphStyle.alignment = NSTextAlignmentCenter;    NSDictionary * attributes = @{NSFontAttributeName:theFont, NSParagraphStyleAttributeName:paragraphStyle                                          };    // ERROR            [pgStr drawInRect:[some frame] withAttributes:attributes];

要修复它，请在段落样式中引入行高:

    paragraphStyle.minimumLineHeight = theFont.pointSize;    paragraphStyle.maximumLineHeight = theFont.pointSize;