(NSCFType set) - iOS 6中无法识别的选择器

Question

我正在使用伟大的TTTAttributedLabel(https://github.com/mattt/TTTAttributedLabel)在iOS 5下工作正常.但是在iOS 6下,我收到错误:

-[__NSCFType set]: unrecognized selector sent to instance 0x200020e0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-  [__NSCFType set]: unrecognized selector sent to instance 0x200020e0'

稍微研究了这个问题后,似乎将设置的消息发送到已经发布的对象.使用调试器,我已经po'd 0x200020e0,它似乎是CTFontRef.

po 0x200020e0
(int) $0 = 536879328 CTFont <name: .HelveticaNeueUI-Bold, size: 20.000000, matrix: 0x0>
CTFontDescriptor <attributes: <CFBasicHash 0x20001900 [0x3c2a4100]>{type = mutable dict, count = 1,
entries =>
1 : <CFString 0x3be2a768 [0x3c2a4100]>{contents = "NSFontNameAttribute"} = <CFString 0x3c292c14 [0x3c2a4100]>{contents = ".HelveticaNeueUI-Bold"}

}

这让我直接找到了设置TTTAttributedLabel的代码:

 [label setText:text afterInheritingLabelAttributesAndConfiguringWithBlock:^ NSMutableAttributedString *(NSMutableAttributedString *mutableAttributedString) {
    NSRange boldRange = [[mutableAttributedString string] rangeOfString:title options:NSCaseInsensitiveSearch];
    NSRange strikeRange = [[mutableAttributedString string] rangeOfString:@"sit amet" options:NSCaseInsensitiveSearch];


    UIFont *boldSystemFont = [UIFont boldSystemFontOfSize:20];

    CTFontRef font = CTFontCreateWithName((__bridge CFStringRef)boldSystemFont.fontName, boldSystemFont.pointSize, NULL);

    if (font) {
        [mutableAttributedString addAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)font range:boldRange];
        [mutableAttributedString addAttribute:(NSString*)kCTForegroundColorAttributeName value:(__bridge id)font range:boldRange];
        CFRelease(font);
    }

    return mutableAttributedString;
}];

如在此处的示例用法:

https://github.com/mattt/TTTAttributedLabel

该代码不是ARCified所以我添加了桥接转换(见上文).我已经尝试过保留所有地方,但这似乎并没有解决CTFontRef过早发布的问题(似乎是)(我认为 - 欢迎其他建议).

关于如何解决这个问题的任何想法以及为什么这只会在iOS 6模拟器下出现？提前致谢.

Answer 1

取代:

CTFontRef font = CTFontCreateWithName((__bridge CFStringRef)boldSystemFont.fontName, boldSystemFont.pointSize, NULL);

有:

UIFont *font = [UIFont fontWithName:boldSystemFont.fontName size:boldSystemFont.pointSize];

修复了iOS6中的问题.未在iOS 5上测试过.

Answer 2

最终这只是一个愚蠢的错误——

[mutableAttributedString addAttribute:(NSString*)kCTForegroundColorAttributeName value:(__bridge id)font range:boldRange];

应该读过：

[mutableAttributedString addAttribute:(NSString*)kCTForegroundColorAttributeName value:(id)[UIColor blueColor].CGColor range:boldRange];