在實際的應用開發中經常需要使用到富文本，這里總結經常使用到的富文本屬性方便學習與記憶
NSFontAttributeName：指定字體大小，默認是12point；UIFont
代碼實例:
NSMutableAttributedString *originString = [[NSMutableAttributedString alloc] initWithString:@"默認字體樣式\n" attributes:nil]; //增加NSFontAttributeName屬性設置字體大小為18 NSAttributedString *fontAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSFontAttributeName樣式的字體\n" attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:18]}]; [originString appendAttributedString:fontAttributeStr];NSForegroundColorAttributeName:指定字體顏色，默認是黑色；UIColor
代碼實例：
//增加NSForegroundColorAttributeName屬性設置字體顏色為紅色 NSAttributedString *textColorAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSForegroundColorAttributeName樣式的字體\n" attributes:@{NSForegroundColorAttributeName:[UIColor redColor]}]; [originString appendAttributedString:textColorAttributeStr];NSBackgroundColorAttributeName：指定字體背景顏色；UIColor
代碼實例：
NSAttributedString *backColorAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSBackgroundColorAttributeName樣式的字體\n" attributes:@{NSBackgroundColorAttributeName:[UIColor redColor]}]; [originString appendAttributedString:backColorAttributeStr];NSLigatureAttributeName：連體字符設置，沒用過暫時；NSNumber
NSKernAttributeName：設置字體間距；NSNumber
代碼實例：
NSAttributedString *textSpaceAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSKernAttributeName樣式的字體\n" attributes:@{NSKernAttributeName:@3}]; [originString appendAttributedString:textSpaceAttributeStr];NSStrikethroughStyleAttributeName：設置刪除線樣式，其取值如下：NSNumber
| 取值 | 對應樣式 |
|---|---|
| NSUnderlineStyleNone | 不設置刪除線 |
| NSUnderlineStyleSingle | 一條較細的刪除線 |
| NSUnderlineStyleThick | 一條較粗的刪除線 |
| NSUnderlineStyleDouble | 兩條較細的刪除線 |
| NSUnderlineStyleDouble | 兩條較細的刪除線 |
代碼實例：
NSAttributedString *deleteAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSStrikethroughStyleAttributeName樣式的字體\n" attributes:@{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleThick),NSStrikethroughColorAttributeName:[UIColor redColor]}]; [originString appendAttributedString:deleteAttributeStr];
- NSStrikethroughColorAttributeName：設置刪除線的顏色；UIColor
- NSUnderlineStyleAttributeName ** 和 NSUnderlineColorAttributeName：設置下劃線和下劃線的顏色；NSNumber** && UIColor下劃線樣式取值與NSStrikethroughStyleAttributeName使用相同的枚舉；
-
NSStrokeWidthAttributeName 和 NSStrokeColorAttributeName ：字體描邊以及描邊顏色的設置；NSNumber && UIColor
代碼實例：
//設置字體描邊以及描邊顏色 NSAttributedString *strokeAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSStrokeWidthAttributeName樣式的字體\n" attributes:@{NSStrokeWidthAttributeName:@1,NSStrokeColorAttributeName:[UIColor redColor],NSFontAttributeName:[UIFont systemFontOfSize:18 weight:UIFontWeightBold]}]; [originString appendAttributedString:strokeAttributeStr]; -
NSShadowAttributeName：設置文字陰影； NSShadow
代碼實例：
//設置文字陰影，使用NSShadow NSShadow *shadow = [[NSShadow alloc] init]; shadow.shadowBlurRadius = 3.0f; //模糊 shadow.shadowColor = [UIColor redColor];//顏色 shadow.shadowOffset = CGSizeMake(1, 5); NSAttributedString *shadowAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSShadowAttributeName樣式的字體\n" attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:18],NSShadowAttributeName:shadow}]; [originString appendAttributedString:shadowAttributeStr]; -
NSBaselineOffsetAttributeName：設置文字基于準線上下偏移，其值為正數時上移，反之下移 NSNumber
代碼實例：
//設置文字偏移 NSAttributedString *baselineOffsetAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSBaselineOffsetAttributeName樣式的字體\n" attributes:@{NSBaselineOffsetAttributeName:@5}]; //方便對比加入正常的字符串 [originString appendAttributedString:[[NSAttributedString alloc] initWithString:@"沒有設置偏移的" attributes:nil]]; [originString appendAttributedString:baselineOffsetAttributeStr]; -
NSWritingDirectionAttributeName：設置文字書寫方向 NSArray of NSNumber
代碼實例：
//設置文字書寫方向：NSWritingDirectionAttributeName NSAttributedString *directionAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSWritingDirectionAttributeName樣式的字體\n" attributes:@{NSWritingDirectionAttributeName:@[@3]}]; [originString appendAttributedString:directionAttributeStr]; -
NSLinkAttributeName：設置點擊文字的跳轉鏈接，需要使用UITextView并實現其代理方法shouldInteractWithURL NSURL or NSString
代碼實例：
//設置點擊跳轉鏈接：NSLinkAttributeName NSAttributedString *linkAttributeStr = [[NSAttributedString alloc] initWithString:@"帶有NSLinkAttributeName樣式的字體\n" attributes:@{NSLinkAttributeName:@"https://www.baidu.com"}]; [originString appendAttributedString:linkAttributeStr]; -
NSTextAttachment：文本附件，常被用來實現圖文混排 NSTextAttachment
代碼實例：
//圖文混排 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:@"帶有NSTextAttachment樣式的字體\n" attributes:nil]; [originString appendAttributedString:attachmentImg]; [originString appendAttributedString:attachmentAttributeStr];
以上所有樣式的效果圖如下：
