2

我对核心文本相当陌生。我有两个属性字符串，它们只有一个区别，在第二个示例中，第一个字符设置为 Verdana-Italic 大小 22。

第一个通过 CTFramesetterCreateWithAttributedString((CFAttributedStringRef) attributesText); 没有问题 但第二个 noe 因 EXC_BAD_ACCESS 而崩溃。

知道为什么当我所做的只是将斜体 verdana 添加到第一个字符时第二个崩溃吗？

pCO{
    CTForegroundColor = "<CGColor 0x8664bb0> [<CGColorSpace 0x816eef0> (kCGColorSpaceDeviceGray)] ( 0 1 )";
    NSFont = "CTFont <name: Verdana, size: 22.000000, matrix: 0x0>\nCTFontDescriptor <attributes: <CFBasicHash 0x835a240 [0x13fab48]>{type = mutable dict, count = 1,\nentries =>\n\t1 : <CFString 0x278c40 [0x13fab48]>{contents = \"NSFontNameAttribute\"} = <CFString 0x86566e0 [0x13fab48]>{contents = \"Verdana\"}\n}\n>";
    NSParagraphStyle = "CTParagraphStyle:\nwriting direction = -1, alignment = 2, line break mode = 4, default tab interval = 0\nfirst line head indent = 0, head indent = 0, tail indent = 0\nline height multiple = 0, maximum line height = 0, minimum line height = 0\nline spacing adjustment = 0, paragraph spacing = 0, paragraph spacing before = 0\ntabs:\n<CFArray 0x8659590 [0x13fab48]>{type = immutable, count = 12, values = (\n\t0 : CTTextTab: location = 28, alignment = 0, options = (none)\n\n\t1 : CTTextTab: location = 56, alignment = 0, options = (none)\n\n\t2 : CTTextTab: location = 84, alignment = 0, options = (none)\n\n\t3 : CTTextTab: location = 112, alignment = 0, options = (none)\n\n\t4 : CTTextTab: location = 140, alignment = 0, options = (none)\n\n\t5 : CTTextTab: location = 168, alignment = 0, options = (none)\n\n\t6 : CTTextTab: location = 196, alignment = 0, options = (none)\n\n\t7 : CTTextTab: location = 224, alignment = 0, options = (none)\n\n\t8 : CTTextTab: location = 252, alignment = 0, options = (none)\n\n\t9 : CTTextTab: location = 280, alignment = 0, options = (none)\n\n\t10 : CTTextTab: location = 308, alignment = 0, options = (none)\n\n\t11 : CTTextTab: location = 336, alignment = 0, options = (none)\n\n)}";
}2{
    NSSuperScript = "-1";
}

和

p{
    NSFont = "<UICFFont: 0x8484240> font-family: \"Verdana\"; font-weight: normal; font-style: italic; font-size: 22px";
}CO{
    CTForegroundColor = "<CGColor 0x847e820> [<CGColorSpace 0x8426810> (kCGColorSpaceDeviceGray)] ( 0 1 )";
    NSFont = "CTFont <name: Verdana, size: 22.000000, matrix: 0x0>\nCTFontDescriptor <attributes: <CFBasicHash 0x832ecb0 [0x13fab48]>{type = mutable dict, count = 1,\nentries =>\n\t1 : <CFString 0x278c40 [0x13fab48]>{contents = \"NSFontNameAttribute\"} = <CFString 0x847ccb0 [0x13fab48]>{contents = \"Verdana\"}\n}\n>";
    NSParagraphStyle = "CTParagraphStyle:\nwriting direction = -1, alignment = 2, line break mode = 4, default tab interval = 0\nfirst line head indent = 0, head indent = 0, tail indent = 0\nline height multiple = 0, maximum line height = 0, minimum line height = 0\nline spacing adjustment = 0, paragraph spacing = 0, paragraph spacing before = 0\ntabs:\n<CFArray 0x847ee20 [0x13fab48]>{type = immutable, count = 12, values = (\n\t0 : CTTextTab: location = 28, alignment = 0, options = (none)\n\n\t1 : CTTextTab: location = 56, alignment = 0, options = (none)\n\n\t2 : CTTextTab: location = 84, alignment = 0, options = (none)\n\n\t3 : CTTextTab: location = 112, alignment = 0, options = (none)\n\n\t4 : CTTextTab: location = 140, alignment = 0, options = (none)\n\n\t5 : CTTextTab: location = 168, alignment = 0, options = (none)\n\n\t6 : CTTextTab: location = 196, alignment = 0, options = (none)\n\n\t7 : CTTextTab: location = 224, alignment = 0, options = (none)\n\n\t8 : CTTextTab: location = 252, alignment = 0, options = (none)\n\n\t9 : CTTextTab: location = 280, alignment = 0, options = (none)\n\n\t10 : CTTextTab: location = 308, alignment = 0, options = (none)\n\n\t11 : CTTextTab: location = 336, alignment = 0, options = (none)\n\n)}";
}2{
    NSSuperScript = "-1";
}

干杯

尼克

4

2 回答 2

7

在这里仔细阅读了一些答案后，我注意到我使用了 UIFont 而不是 CTFont。像这样将您的 UIFont 转换为 CTFont：

CTFontRef CTFontCreateFromUIFont(UIFont *font)
{
    CTFontRef ctFont = CTFontCreateWithName((__bridge CFStringRef)font.fontName, 
                                            font.pointSize, 
                                            NULL);
    return ctFont;
}

然后像这样将它添加到您的 NSAttributedString

CTFontRef italicFont = CTFontCreateFromUIFont(italicUIFont);
[aStr addAttribute:(NSString*)kCTFontAttributeName value:(__bridge id)italicFont range:NSMakeRange(0,5)];

瞧，它不会再崩溃了，并且会像我想要的那样显示。:-)

干杯

尼克

于 2012-05-30T19:20:33.343 回答
1

如果使用不正确， Niklassaers 的答案可能会在 ARC 下泄漏，如下所示：

仪器 http://goo.gl/xrxwdb

所以添加属性后，一定要：

CFRelease(italicFont);
于 2013-11-07T12:19:32.470 回答