104

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

但是怎么用NSAttributedString？我搜索了很多时间，没有提取线索。

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

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

有没有这样简单的方法？

NSAttributedString *str;
.....
UILabel *label;
label.attributedString = str;
4

9 回答 9

155

从 iOS 6.0 开始，您可以这样做：

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"Hello. That is a test attributed string."];
[str addAttribute:NSBackgroundColorAttributeName value:[UIColor yellowColor] range:NSMakeRange(3,5)];
[str addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(10,7)];
[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"HelveticaNeue-Bold" size:20.0] range:NSMakeRange(20, 10)];
label.attributedText = str;
于 2012-07-02T09:50:00.307 回答
81

你应该看看AliSoftware 的 OHAttributedLabel。它是 UILabel 的子类，它绘制一个 NSAttributedString 并且还提供了方便的方法来从 UIKit 类中设置 NSAttributedString 的属性。

从 repo 中提供的示例中：

#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的属性文本属性呈现属性字符串。

于 2010-10-06T02:12:00.980 回答
15

您应该尝试TTTAttributedLabel。它是 UILabel 的直接替代品，可与 NSAttributedString 一起使用，并且对于 UITableViewCells 来说足够高效。

于 2011-05-09T19:14:08.597 回答
6

Answer for UILabel attributed text alignment on iOS 6: Use NSMutableAttributedString and add NSMutableParagraphStyle to the attribute. Something like this:

NSString *str = @"Hello World!";
NSRange strRange = NSMakeRange(0, str.length);
NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:str];

NSMutableParagraphStyle *paragrahStyle = [[NSMutableParagraphStyle alloc] init];
[paragrahStyle setAlignment:NSTextAlignmentCenter];
[attributedStr addAttribute:NSParagraphStyleAttributeName value:paragrahStyle range:strRange];

myUILabel.attributedText = attributedStr;
于 2013-01-15T17:30:08.943 回答
6

有没有简单的方法比如

NSAttributedString *str;

UILabel *标签；

标签.attributedString = str;

几乎。只需使用 CATextLayer。它有一个string可以设置为 NSAttributedString 的属性。

编辑（2012 年 11 月）：当然，这一切在 iOS 6 中都发生了变化。在 iOS 6 中，您可以完全按照 OP 的要求执行操作 - 将属性字符串直接分配给标签的attributedText.

于 2010-12-12T16:41:41.800 回答
6

我认为给出一个解析（简化的）HTML 字符串的示例以创建 NSAttributedString 会很有用。

它并不完整——它只处理 <b> 和 <i> 标签，对于初学者来说，并且不会为任何错误处理而烦恼——但希望它也是如何开始使用 NSXMLParserDelegate 的有用示例......


@interface ExampleHTMLStringToAttributedString : NSObject<NSXMLParserDelegate>

+(NSAttributedString*) getAttributedStringForHTMLText:(NSString*)htmlText WithFontSize:(CGFloat)fontSize;

@end

@interface ExampleHTMLStringToAttributedString()
@property NSString *mpString;
@property NSMutableAttributedString *mpAttributedString;

@property CGFloat mfFontSize;
@property NSMutableString *appendThisString;
@property BOOL mbIsBold;
@property BOOL mbIsItalic;
@end

@implementation ExampleHTMLStringToAttributedString
@synthesize mpString;
@synthesize mfFontSize;
@synthesize mpAttributedString;
@synthesize appendThisString;
@synthesize mbIsBold;
@synthesize mbIsItalic;

+(NSAttributedString*) getAttributedStringForHTMLText:(NSString*)htmlText WithFontSize:(CGFloat)fontSize {

    ExampleHTMLStringToAttributedString *me = [[ExampleHTMLStringToAttributedString alloc] initWithString:htmlText];
    return [me getAttributedStringWithFontSize:fontSize];
}

- (id)initWithString:(NSString*)inString {
    self = [super init];
    if (self) {
        if ([inString hasPrefix:@""]) {
          mpString = inString;
        } else {
            mpString = [NSString stringWithFormat:@"%@", inString];
        }
        mpAttributedString = [NSMutableAttributedString new];
    }
    return self;
}

-(NSAttributedString*) getAttributedStringWithFontSize:(CGFloat)fontSize {

    mfFontSize = fontSize;

    // Parse the XML
    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:[mpString dataUsingEncoding:NSUTF8StringEncoding]];
    parser.delegate = self;
    if (![parser parse]) {
        return nil;
    }

    return mpAttributedString;
}

-(void) appendTheAccumulatedText {
    UIFont *theFont = nil;

    if (mbIsBold && mbIsItalic) {
        // http://stackoverflow.com/questions/1384181/italic-bold-and-underlined-font-on-iphone
        theFont = [UIFont fontWithName:@"Helvetica-BoldOblique" size:mfFontSize];
    } else if (mbIsBold) {
       theFont = [UIFont boldSystemFontOfSize:mfFontSize];
    } else if (mbIsItalic) {
        theFont = [UIFont italicSystemFontOfSize:mfFontSize];
    } else {
        theFont = [UIFont systemFontOfSize:mfFontSize];
    }

    NSAttributedString *appendThisAttributedString =
    [[NSAttributedString alloc]
     initWithString:appendThisString
     attributes:@{NSFontAttributeName : theFont}];

    [mpAttributedString appendAttributedString:appendThisAttributedString];

    [appendThisString setString:@""];
}

#pragma NSXMLParserDelegate delegate

-(void)parserDidStartDocument:(NSXMLParser *)parser{
    appendThisString = [NSMutableString new];
    mbIsBold = NO;
    mbIsItalic = NO;
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {
    if ([elementName isEqualToString:@"body"]){
    } else if ([elementName isEqualToString:@"i"]) {
      [self appendTheAccumulatedText];
        mbIsItalic = YES;
    } else if ([elementName isEqualToString:@"b"]) {
      [self appendTheAccumulatedText];
        mbIsBold = YES;
    }
}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
    if ([elementName isEqualToString:@"body"]){
      [self appendTheAccumulatedText];
    } else if ([elementName isEqualToString:@"i"]) {
      [self appendTheAccumulatedText];
      mbIsItalic = NO;
    } else if ([elementName isEqualToString:@"b"]) {
        [self appendTheAccumulatedText];
        mbIsBold = NO;
    }
}

-(void)parserDidEndDocument:(NSXMLParser *)parser{
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
    [appendThisString appendString:string];
}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
}

@end

要使用，请执行以下操作：


  self.myTextView.attributedText = [ExampleHTMLStringToAttributedString getAttributedStringForHTMLText:@"this is <b>bold</b> text" WithFontSize:self.myTextView.pointSize];
于 2013-03-27T11:35:15.570 回答
5

从 iOS 6.0 开始，您可以这样做：另一个示例代码。 

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"This is my test code to test this label style is working or not on the text to show other user"];

[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,31)];
[str addAttribute:NSBackgroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(61,10)];

[str addAttribute:NSFontAttributeName value: [UIFont fontWithName:@"Helvetica-Bold" size:13.0] range:NSMakeRange(32, 28)];
[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Helvetica-Bold" size:13.0] range:NSMakeRange(65, 20)];

_textLabel.attributedText = str;
于 2013-09-03T09:09:20.273 回答
2

对于Swift使用这个，

它会使标题文本加粗，

var title = NSMutableAttributedString(string: "Title Text")

    title.addAttributes([NSFontAttributeName: UIFont(name: "AvenirNext-Bold", size: iCurrentFontSize)!], range: NSMakeRange(0, 4))

    label.attributedText = title
于 2015-03-27T13:08:31.940 回答
2

我知道这有点晚了，但这对其他人有用，

NSMutableAttributedString* attrStr = [[NSMutableAttributedString alloc] initWithString:@"string" attributes:@{NSForegroundColorAttributeName:[UIColor blackColor]}];

[self.label setAttributedText:newString];

将所需的属性添加到字典并将其作为属性参数传递

于 2015-11-30T13:44:54.133 回答