如何在iOS中的NSAttributedString中设置属性？

问题描述

我想在iOS中设置NSAttributedString的臭名昭着的NSFontAttributeName属性，但它似乎不工作：

1. 首先，没有为iOS定义的NS常量。


2. 我在某处读到了，我可以通过传递
   的CoreText常量。好...但仍然，属性
   期望一个NSFont和我卡住UIFont或CTFontRef，
   似乎无效：

这不起作用：

  CTFontRef ctFont = CTFontCreateWithName（（CFStringRef）[UIFont boldSystemFontOfSize：16] .fontName，[UIFont boldSystemFontOfSize：16] .pointSize，NULL）; 
 [myAttString addAttribute：（NSString *）kCTFontNameAttribute 
 value：（id）ctFont 
 range：NSMakeRange（0，myAttString.length-1）]; 
  

这不工作：

  [myAttString addAttribute：（NSString *）kCTFontNameAttribute 
 value：[UIFont boldSystemFontOfSize：16] 
 range：NSMakeRange（0，myAttString.length-1）]; 
  

有没有要做这项工作？

基本上，结果是我应该使用的字典键的字符串常量是kCTFontAttributeName

p>

这整件事都是一个表演...

I'm trying to set the infamous NSFontAttributeName property of an NSAttributedString in iOS but it just doesn't seem to work:

1. first off, none of the NS constants seem defined for iOS
2. I read somewhere that I could instead work around it by passingthe CoreText consts instead. Fine... but still, The attributeexpects an NSFont and I'm stuck with UIFont or CTFontRef, neither ofwhich seems to work:

this doesn't work:

CTFontRef ctFont = CTFontCreateWithName((CFStringRef)[UIFont boldSystemFontOfSize:16].fontName, [UIFont boldSystemFontOfSize:16].pointSize, NULL);
[myAttString addAttribute:(NSString*)kCTFontNameAttribute
                          value:(id)ctFont
                          range:NSMakeRange(0, myAttString.length-1)];

this doesn't work:

[myAttString addAttribute:(NSString*)kCTFontNameAttribute
                          value:[UIFont boldSystemFontOfSize:16]
                          range:NSMakeRange(0, myAttString.length-1)];

Is there anyway to make this work?

解决方案

I found it!

basically, turns out the string constant for the dictionary key I should been using is kCTFontAttributeName

This whole thing is a show...

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