Question

在使用NSAttributedString中的日文文本绘制到上下文后，是否有人遇到过Ucode在UIGraphicsEndPDFContext（）失败？幸运的是，当我第一次用日语测试我的代码时，我的iPhone处于脱机状态且运行正常。但是，很久以后，当我在模拟器中运行相同的代码时，它失败了，我花了很多时间来尝试调试它。当硬连线到Mac时，尝试从iPhone或iPad上的Xcode运行它时也会失败。似乎试图以这种方式从日语中运行Xcode就是问题所在。 Mac被设置为英语。

以下是我用于绘图的方法。它紧密地基于Erica Sadun在她的书“iOS 5 Developer's Cookbook”中发表的例子，这对我来说是一本很好的阅读。它位于UIGraphicsBeginPDFContextToData（）和UIGraphicsBeginPDFPageWithInfo（）序列之后，并且在UIGraphicsEndPDFContext（）调用之前，所有这些都在英语中正常工作。我不一定需要解决这个问题。我只是想提醒别人，以便他们可以避免我花两天时间试图解决这个问题。

- (void)drawText:(NSAttributedString *)textToDraw inFrame:(CGRect)frameRect bkgColor:(UIColor *)backgroundColor {

CFAttributedStringRef currentText = (__bridge CFAttributedStringRef)(textToDraw);
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(currentText);

// Draw background when a color is set
if (backgroundColor) {
    [backgroundColor set];
    CGRect backgroundFrame = CGRectMake(frameRect.origin.x, frameRect.origin.y -backgroundOffset, frameRect.size.width, frameRect.size.height -3);
    //CGRect backgroundFrame = CGRectMake(frameRect.origin.x, frameRect.origin.y -2, frameRect.size.width, frameRect.size.height -3);
    CGContextFillRect( UIGraphicsGetCurrentContext(), backgroundFrame);
    [[UIColor whiteColor] set];
}

CGMutablePathRef framePath = CGPathCreateMutable();
CGPathAddRect(framePath, NULL, frameRect);

// Get the frame that will do the rendering.
CFRange currentRange = CFRangeMake(0, 0);
CTFrameRef frameRef = CTFramesetterCreateFrame(framesetter, currentRange, framePath, NULL);
CGPathRelease(framePath);

// Get the graphics context.
CGContextRef currentContext = UIGraphicsGetCurrentContext();

// Put the text matrix into a known state so no old scaling factors are left in place.
CGContextSetTextMatrix(currentContext, CGAffineTransformIdentity);

int adjust = frameRect.origin.y * 2 + frameRect.size.height;

// Core Text draws from the bottom-left corner up, so flip
// the current transform prior to drawing.
CGContextTranslateCTM(currentContext, 0, adjust);
CGContextScaleCTM(currentContext, 1.0, -1.0);

// Draw the frame.
CTFrameDraw(frameRef, currentContext);

CGContextScaleCTM(currentContext, 1.0, -1.0);
CGContextTranslateCTM(currentContext, 0, (-1)*adjust);

CFRelease(frameRef);
CFRelease(framesetter);
backgroundColor = nil;

}

UIGraphicsEndPDFContext（）;与日语NSAttributedText失败

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