Question

我对Core Text相当新鲜。我有两个属性字符串，只有一个区别，在第二个例子中，第一个字符设置为Verdana-Italic 22。

第一个没有问题 CTFramesetterCreateWithAttributedString（（CFAttributedStringRef）attributedText）; 但第二个用EXC_BAD_ACCESS崩溃了。

我知道为什么第二个崩溃的原因是为第一个角色添加斜体verdana？

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

的Nik

Answer 1

在这里仔细阅读了几个答案之后，我注意到我使用的是UIFont而不是CTFont。将您的UIFont转换为CTFont，如下所示：

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

然后将它添加到您的NSAttributedString中，就像这样

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

瞧，它不会再崩溃，而且显示就像我想要的那样。： - ）

干杯

的Nik

Answer 2

如果使用不正确，

Niklassaers' answer可能会在ARC下泄漏，如下所示：

Instruments http://goo.gl/xrxwdb

添加属性后，请务必：

CFRelease(italicFont);

为什么在设置斜体字体时CTFramesetterCreateWithAttributedString会崩溃？

2 个答案: