【发布时间】：2012-01-18 22:05:20
【问题描述】：
我创建了一个从普通字符串生成属性字符串的方法。下面的attrString 值不为空且内容正确。
在运行我的应用程序时，第二行以EXC_BAD_ACCESS 失败。知道为什么吗？
__bridge_retained 调用是 iOS 5 要求 afaik。我也试过__bridge，但是没有效果，问题依旧。
NSMutableAttributedString *attrString = (NSMutableAttributedString*)[textLayer attributedString];
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge_retained CFMutableAttributedStringRef)attrString);
更新
如果我这样做：
NSMutableAttributedString *attrString = (NSMutableAttributedString*)[textLayer attributedString];
NSLog(@"%@", attrString);
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFMutableAttributedStringRef)attrString);
那么NSLog 行将无法编译； Xcode 给出警告和错误声明"Incompatible pointer types passing 'char[3]' to parameter of type 'NSString *'"。
所以我尝试了这个：
NSLog([attrString description]);
这给出了以下输出（出于隐私考虑，我已将字符串内容替换为<snipped>）：
2012-01-19 06:49:11.307 WritePath[2475:707] <Snipped>
{
CTForegroundColor = "<CGColor 0x281530> [<CGColorSpace 0x22d1a0> (kCGColorSpaceDeviceRGB)] ( 0 0 0 1 )";
NSFont = "<CGFont (0x28f850): ArialMT>";
NSParagraphStyle = "CTParagraphStyle:\nwriting direction = -1, alignment = 3, line break mode = 0, 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 0x287b50 [0x3f229630]>{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)}";
}
【问题讨论】：
-
您应该在此处使用
__bridge以避免内存泄漏。如果你NSLog("%@", attrString)，输出是什么？将输出粘贴到您的问题中。 -
@rob 感谢您的回复 - 我已经按照您的要求完成了，见上文。
-
对不起，我应该说
NSLog(@"%@", attrString)。但是你做的没问题。 -
您是否尝试过使用更简单的属性字符串？例如。
NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:@"hello"]?或者 Core Foundation 版本：CFAttributedStringRef attrString = CFAttributedStringCreate(NULL, CFSTR("hello"), NULL).
标签： ios string attributes exc-bad-access