iOS： 富文本AttributedString的详解

AttributedString可以分为NSAttributedString和NSMutableAttributedString两种，在使用中通过把AttributedString赋值给控件的attributedText属性来添加文字样式。具有该属性的控件有UILabel、UITextField和UITextView。

首先，初始化：

NSString *string = @"这是一个富文本字符串";NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];

然后，根据API中属性顺序依次详细说明：

No.1 字体

[attributedString addAttribute:NSFontAttributeName                         value:[UIFont systemFontOfSize:30.0f]                         range:NSMakeRange(4, 3)];

No.2 段落

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];//行间距paragraphStyle.lineSpacing = 5.f;//段落间距paragraphStyle.paragraphSpacing = 5.f;//段落缩进像素paragraphStyle.firstLineHeadIndent = 25.f;//整体缩进像素paragraphStyle.headIndent = 10.f;//对齐方式paragraphStyle.alignment = NSTextAlignmentLeft;//段落[其他属性参照NSMutableParagraphStyle][attributedString addAttribute:NSParagraphStyleAttributeName                         value:paragraphStyle                         range:NSMakeRange(0, attributedString.length)];

No.3 前景色

[attributedString addAttribute:NSForegroundColorAttributeName                         value:[[UIColor redColor]                         range:NSMakeRange(4, 3)];

No.4 背景色

[attributedString addAttribute:NSBackgroundColorAttributeName                         value:[UIColor redColor]                         range:NSMakeRange(4, 3)];

No.5 连字符

string = @"flash player";attributedString = [[NSMutableAttributedString alloc] initWithString:string];[attributedString addAttribute:NSLigatureAttributeName                         value:@1                         range:NSMakeRange(0, 5)];[attributedString addAttribute:NSFontAttributeName                         value:[UIFont fontWithName:@"futura" size:30]                         range:NSMakeRange(0, 5)];

No.6 文字间距

[attributedString addAttribute:NSKernAttributeName                         value:@10                                           range:NSMakeRange(3, 4)];

No.7 删除线

[attributedString addAttribute:NSStrikethroughStyleAttributeName                         value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle)                         range:NSMakeRange(4, 3)];[attributedString addAttribute:NSBaselineOffsetAttributeName                         value:@1                         range:NSMakeRange(4, 3)];[attributedString addAttribute:NSStrikethroughColorAttributeName                         value:[UIColor redColor]                         range:NSMakeRange(4, 3)];

No.8 下划线

//下划线[attributedString addAttribute:NSUnderlineStyleAttributeName                         value:@(NSUnderlineStyleSingle)                         range:NSMakeRange(4, 3)];//下划线颜色[attributedString addAttribute:NSUnderlineColorAttributeName                         value:[UIColor redColor]                         range:NSMakeRange(4, 3)];

No.9 空心字

//描边颜色需和描边宽度一起使用[attributedString addAttribute:NSStrokeColorAttributeName                         value:[UIColor redColor]                         range:NSMakeRange(4, 3)];[attributedString addAttribute:NSStrokeWidthAttributeName                         value:@1.5                         range:NSMakeRange(4, 3)];                  

No.10 阴影

NSShadow *shadow = [[NSShadow alloc] init];  shadow.shadowOffset = CGSizeMake(0, 1);  shadow.shadowBlurRadius = 2; shadow.shadowColor = [UIColor greenColor];   [attributedString addAttribute:NSShadowAttributeName                         value:shadow                         range:NSMakeRange(4, 3)];    

No.11 图文混排

NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];textAttachment.image = [UIImage imageNamed:@"emotion_0"];textAttachment.bounds = CGRectMake(0, -6, 30, 30);  NSAttributedString *attachmentAttrStr = [NSAttributedString attributedStringWithAttachment:textAttachment];[attributedString insertAttributedString:attachmentAttrStr atIndex:7];

No.12 链接

attributedString = [[NSMutableAttributedString alloc] initWithString:@"这是一个网址：https://github.com/dexianyinjiu"];[attributedString addAttribute:NSLinkAttributeName                         value:@"https://github.com/dexianyinjiu"                         range:NSMakeRange(7, attributedString.length-7)];

No.13 基线偏移

[attributedString addAttribute:NSBaselineOffsetAttributeName                         value:@(10.f)                         range:NSMakeRange(4, 3)];

No.14 倾斜

[attributedString addAttribute:NSObliquenessAttributeName                         value:@(0.5f)                         range:NSMakeRange(4, 3)];

No.15 拉伸/压缩

[attributedString addAttribute:NSExpansionAttributeName                         value:@(0.5f)                         range:NSMakeRange(4, 3)];

No.16 书写方向

[attributedString addAttribute:NSWritingDirectionAttributeName                         value:@[@(NSWritingDirectionRightToLeft | NSWritingDirectionOverride)]                         range:NSMakeRange(0, attributedString.length)];

No.17 横/竖向排版

//0：横向排版 其他：竖向排版  [attributedString addAttribute:NSVerticalGlyphFormAttributeName                         value:@1                            range:NSMakeRange(0, attributedString.length)];