在实际的应用开发中经常需要使用到富文本，这里总结经常使用到的富文本属性方便学习与记忆
NSFontAttributeName：指定字体大小，默认是12point；UIFont
代码实例:
NSMutableAttributedString *originString = [[NSMutableAttributedString alloc] initWithString:@"默认字体样式\n" attributes:nil]; //增加NSFontAttributeName属性设置字体大小为18 NSAttributedString *fontAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSFontAttributeName样式的字体\n" attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:18]}]; [originString appendAttributedString:fontAttributeStr];NSForegroundColorAttributeName:指定字体颜色，默认是黑色；UIColor
代码实例：
//增加NSForegroundColorAttributeName属性设置字体颜色为红色 NSAttributedString *textColorAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSForegroundColorAttributeName样式的字体\n" attributes:@{NSForegroundColorAttributeName:[UIColor redColor]}]; [originString appendAttributedString:textColorAttributeStr];NSBackgroundColorAttributeName：指定字体背景颜色；UIColor
代码实例：
NSAttributedString *backColorAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSBackgroundColorAttributeName样式的字体\n" attributes:@{NSBackgroundColorAttributeName:[UIColor redColor]}]; [originString appendAttributedString:backColorAttributeStr];NSLigatureAttributeName：连体字符设置，没用过暂时；NSNumber
NSKernAttributeName：设置字体间距；NSNumber
代码实例：
NSAttributedString *textSpaceAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSKernAttributeName样式的字体\n" attributes:@{NSKernAttributeName:@3}]; [originString appendAttributedString:textSpaceAttributeStr];NSStrikethroughStyleAttributeName：设置删除线样式，其取值如下：NSNumber
| 取值 | 对应样式 |
|---|---|
| NSUnderlineStyleNone | 不设置删除线 |
| NSUnderlineStyleSingle | 一条较细的删除线 |
| NSUnderlineStyleThick | 一条较粗的删除线 |
| NSUnderlineStyleDouble | 两条较细的删除线 |
| NSUnderlineStyleDouble | 两条较细的删除线 |
代码实例：
NSAttributedString *deleteAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSStrikethroughStyleAttributeName样式的字体\n" attributes:@{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleThick),NSStrikethroughColorAttributeName:[UIColor redColor]}]; [originString appendAttributedString:deleteAttributeStr];
- NSStrikethroughColorAttributeName：设置删除线的颜色；UIColor
- NSUnderlineStyleAttributeName ** 和 NSUnderlineColorAttributeName：设置下划线和下划线的颜色；NSNumber** && UIColor下划线样式取值与NSStrikethroughStyleAttributeName使用相同的枚举；
- NSStrokeWidthAttributeName 和 NSStrokeColorAttributeName ：字体描边以及描边颜色的设置；NSNumber && UIColor
代码实例：
//设置字体描边以及描边颜色 NSAttributedString *strokeAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSStrokeWidthAttributeName样式的字体\n" attributes:@{NSStrokeWidthAttributeName:@1,NSStrokeColorAttributeName:[UIColor redColor],NSFontAttributeName:[UIFont systemFontOfSize:18 weight:UIFontWeightBold]}]; [originString appendAttributedString:strokeAttributeStr]; - NSShadowAttributeName：设置文字阴影； NSShadow
代码实例：
//设置文字阴影，使用NSShadow NSShadow *shadow = [[NSShadow alloc] init]; shadow.shadowBlurRadius = 3.0f; //模糊 shadow.shadowColor = [UIColor redColor];//颜色 shadow.shadowOffset = CGSizeMake(1, 5); NSAttributedString *shadowAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSShadowAttributeName样式的字体\n" attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:18],NSShadowAttributeName:shadow}]; [originString appendAttributedString:shadowAttributeStr]; - NSBaselineOffsetAttributeName：设置文字基于准线上下偏移，其值为正数时上移，反之下移 NSNumber
代码实例：
//设置文字偏移 NSAttributedString *baselineOffsetAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSBaselineOffsetAttributeName样式的字体\n" attributes:@{NSBaselineOffsetAttributeName:@5}]; //方便对比加入正常的字符串 [originString appendAttributedString:[[NSAttributedString alloc] initWithString:@"没有设置偏移的" attributes:nil]]; [originString appendAttributedString:baselineOffsetAttributeStr]; - NSWritingDirectionAttributeName：设置文字书写方向 NSArray of NSNumber
代码实例：
//设置文字书写方向：NSWritingDirectionAttributeName NSAttributedString *directionAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSWritingDirectionAttributeName样式的字体\n" attributes:@{NSWritingDirectionAttributeName:@[@3]}]; [originString appendAttributedString:directionAttributeStr]; - NSLinkAttributeName：设置点击文字的跳转链接，需要使用UITextView并实现其代理方法shouldInteractWithURL NSURL or NSString
代码实例：
//设置点击跳转链接：NSLinkAttributeName NSAttributedString *linkAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSLinkAttributeName样式的字体\n" attributes:@{NSLinkAttributeName:@"https://www.baidu.com"}]; [originString appendAttributedString:linkAttributeStr]; - NSTextAttachment：文本附件，常被用来实现图文混排 NSTextAttachment
代码实例：
//图文混排 NSTextAttachment *attachment = [[NSTextAttachment alloc] init]; attachment.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://upload.jianshu.io/users/upload_avatars/2115199/148387f72be4.jpg?imageMogr/thumbnail/240x240/quality/100"]]]; attachment.bounds = CGRectMake(0, 0, 30, 30); NSAttributedString *attachmentImg = [NSAttributedString attributedStringWithAttachment:attachment]; NSAttributedString *attachmentAttributeStr = [[NSAttributedString alloc] initWithString:@"带有NSTextAttachment样式的字体\n" attributes:nil]; [originString appendAttributedString:attachmentImg]; [originString appendAttributedString:attachmentAttributeStr];
以上所有样式的效果图如下：
