Question

我有以下代码：

NSString *name = @"some text goes in here";

        CFStringRef string =  (__bridge CFStringRef) self.highlightItem_.comment;
        CFMutableAttributedStringRef comment = CFAttributedStringCreateMutable(kCFAllocatorDefault, 0);
        CFAttributedStringReplaceString (comment ,CFRangeMake(0, 0), string);

        CGColorRef blue =[UIColor colorWithRed:128/255.f green:203/255.f blue:255/255.f alpha:1.0].CGColor;
        CGColorRef gray =[UIColor colorWithWhite:153/255.f alpha:1.0].CGColor;

        CFAttributedStringSetAttribute(comment, CFRangeMake(0, [name length]),kCTForegroundColorAttributeName, blue);
        CFAttributedStringSetAttribute(comment, CFRangeMake([name length],  [self.highlightItem_.comment length] - [name length]),kCTForegroundColorAttributeName, gray);

        CTFontRef nameFont = CTFontCreateWithName((__bridge CFStringRef)kProximaNovaBold, 15.0f, nil);
        CFAttributedStringSetAttribute(comment,CFRangeMake(0, [name length]),kCTFontAttributeName,nameFont);

        CTFontRef commentFont = CTFontCreateWithName((__bridge CFStringRef)kProximaNova, 15.0f, nil);
        CFAttributedStringSetAttribute(comment, CFRangeMake([name length],  [self.highlightItem_.comment length] - [name length]),kCTFontAttributeName,commentFont);

        CGContextSaveGState(context);
        CGRect captionFrame = CGRectMake(0, 0, rect.size.width - 80, commentHeight);
        CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(comment);
        CGMutablePathRef captionFramePath = CGPathCreateMutable();
        CGPathAddRect(captionFramePath, NULL, captionFrame);

        CTFrameRef mainCaptionFrame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), captionFramePath, NULL);

        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextSetTextMatrix(context, CGAffineTransformIdentity);
        CGContextTranslateCTM(context, 70, self.imageHeight_ + commentHeight + 20);
        CGContextScaleCTM(context, 1.0, -1.0);

        CTFrameDraw(mainCaptionFrame, context);
        CGContextRestoreGState(context);

        CFRelease(framesetter);
        CGPathRelease(captionFramePath);

我不确定为什么当我在模拟器上运行它时它一切正常，但是当我在设备上运行它时，它崩溃了：

CFAttributedStringSetAttribute(comment, CFRangeMake(0, [name length]),kCTForegroundColorAttributeName, blue);

任何想法为什么？

Answer 1

所以问题是我没有保留我的CGColor。如果我把CGColorRetain然后它工作

Answer 2

应该不是

CFMutableAttributedStringRef comment = CFAttributedStringCreateMutable(kCFAllocatorDefault, 0);
CFAttributedStringReplaceString (comment ,CFRangeMake(0, 0), string);

读

CFMutableAttributedStringRef comment = CFAttributedStringCreateMutable(
    kCFAllocatorDefault, 
    CFAttributedStringGetLength(string));
CFAttributedStringReplaceString(comment,
    CFRangeMake(0, CFAttributedStringGetLength(string)), 
    string);

在设备上运行时CFMutableAttributedString崩溃（EXC_BAD_ACCESS）

2 个答案: