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) …我使用下面的代码生成PDF但是导致内存泄漏可以有人帮忙吗？代码如下.
- (void)drawText:(NSString*)textToDraw inFrame:(CGRect)frameRect {
NSMutableAttributedString *string = [[[NSMutableAttributedString alloc]
initWithString:textToDraw] autorelease];
// make a few words bold
CTFontRef helveticaBold = CTFontCreateWithName(CFSTR("Helvetica-Bold"), 8.0, NULL);
[string addAttribute:(id)kCTFontAttributeName
value:(id)helveticaBold
range:NSMakeRange(0, [string length])];
// add some color.
if (_flag == 1) {
[string addAttribute:(id)kCTForegroundColorAttributeName
value:(id)[UIColor whiteColor].CGColor
range:NSMakeRange(0, [string length])];
} else {
[string addAttribute:(id)kCTForegroundColorAttributeName
value:(id)[UIColor blackColor].CGColor
range:NSMakeRange(0, [string length])];
}
// layout master
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)string);
CGMutablePathRef framePath = CGPathCreateMutable();
CGPathAddRect(framePath, NULL, frameRect);
// Get the frame that will do the rendering. …我有一个包含字体样式和sumbolic特征的CTFont.
我想创建一个新样式的新字体,它继承了第一个字体的符号特征.我怎样才能做到这一点？
CTFontRef newFontWithoutTraits = CTFontCreateWithName((CFString)newFontName, CTFontGetSize(font), NULL);
CTFontRef newFont = CTFontCreateCopyWithSymbolicTraits(newFontWithoutTraits, CTFontGetSize(font), NULL, 0, CTFontGetSymbolicTraits(font));
新字体在这里为null我不知道应该传递给4th参数CTFontCreateCopyWithSymbolicTraits.
创建CTFont时,我收到以下警告.
CoreText性能注释:客户端请求"ArialRoundedMTBold"使用名称的PostScript名称字体"Arial Rounded MT Bold".
// Creating Font
CTFontRef fontWithoutTrait = CTFontCreateWithName((__bridge CFStringRef)(name), size, NULL);
// Font names I use to create a font
[UIFont familyNames];
如果我删除从[UIFont familyNames]获取的任何字体名称中的所有空格,它是否是核心文本的预期字体名称是否安全？