如何在iOS中的NSAttributedString中设置属性？ [英] how to set attributes in NSAttributedString in iOS?

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 passing the CoreText consts instead. Fine... but still, The attribute expects an NSFont and I'm stuck with UIFont or CTFontRef, neither of which 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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