iphone/ipad：究竟如何使用NSAttributedString？

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

你应该看看 AliSoftware’s OHAttributedLabel.它是一个UILabel的子类，绘制一个NSAttributedString，并提供了方便的方法来设置NSAttributedString从UIKit类的属性。

从repo中提供的示例：

#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UILabel的attributedText属性呈现属性字符串。