iphone/ipad:究竟如何使用 NSAttributedString? [英] iphone/ipad: How exactly use NSAttributedString?

问题描述

是的，很多人都在谈论 iPhone/iPad 中的富文本，很多人都知道 NSAttributedString.

Yes, many people are saying about Rich Text in iPhone/iPad and many knows about NSAttributedString.

但是如何使用NSAttributedString?我搜索了很多时间，没有提取线索.

But how to use NSAttributedString? I searched for much time, no extract clues for this.

我知道如何设置NSAttributedString，那么我应该怎么做才能在iPhone/iPad上显示富文本的文本?

I know how to set up a NSAttributedString, then what should I do to display a text on iPhone/iPad with rich text?

官方文档说它应该与CoreText.Framework一起使用，这是什么意思?

The official docs says it should be used with CoreText.Framework, what does that mean?

有没有这样简单的方法?

Is there any simple way like this?

NSAttributedString *str;
.....
UILabel *label;
label.attributedString = str;

推荐答案

你应该看看 AliSoftware 的 OHAttributedLabel.它是 UILabel 的一个子类，它绘制了一个 NSAttributedString 并且还提供了从 UIKit 类中设置 NSAttributedString 属性的便捷方法.

You should take a look at AliSoftware's OHAttributedLabel. It is a subclass of UILabel that draws an NSAttributedString and also provides convenience methods for setting the attributes of an NSAttributedString from UIKit classes.

来自 repo 中提供的示例:

From the sample provided in the repo:

#import "NSAttributedString+Attributes.h"
#import "OHAttributedLabel.h"

/**(1)** Build the NSAttributedString *******/
NSMutableAttributedString* attrStr = [NSMutableAttributedString attributedStringWithString:@"Hello World!"];
// for those calls we don't specify a range so it affects the whole string
[attrStr setFont:[UIFont systemFontOfSize:12]];
[attrStr setTextColor:[UIColor grayColor]];
// now we only change the color of "Hello"
[attrStr setTextColor:[UIColor redColor] range:NSMakeRange(0,5)];


/**(2)** Affect the NSAttributedString to the OHAttributedLabel *******/
myAttributedLabel.attributedText = attrStr;
// Use the "Justified" alignment
myAttributedLabel.textAlignment = UITextAlignmentJustify;
// "Hello World!" will be displayed in the label, justified, "Hello" in red and " World!" in gray.

注意:在 iOS 6+ 中，您可以使用 attributedText UILabel 的属性.

Note: In iOS 6+ you can render attributed strings using the attributedText property of UILabel.

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