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Rich Text，很多人都知道 NSAttributedString 。

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

但如何使用 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 ，然后我该怎么办才能在iPhone / iPad上用富文本显示文字？

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?

有这样简单的方法吗？

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

推荐答案

你应该看看 AliSoftware的OHAttributedLabel 。它是UILabel的子类，它绘制了一个NSAttributedString，并提供了从UIKit类设置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： / p>

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< a href =https://developer.apple.com/library/ios/documentation/uikit/reference/UILabel_Class/Reference/UILabel.html#//apple_ref/occ/instp/UILabel/attributedText\"rel =noreferrer> UILabel的attributesText 属性。

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

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