http://www.jianshu.com/p/9ffcdc0003e0
首先要創建一個帶有屬性的字符串NSMutableAttributedString
NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:@"這是一個富文本字符串"];
/* 其他幾種創建方法
- (instancetype)initWithString:(NSString *)str;
- (instancetype)initWithString:(NSString *)str attributes:(nullable NSDictionary<NSString *, id> *)attrs;
- (instancetype)initWithAttributedString:(NSAttributedString *)attrStr;
*/如何設置這個字符串的屬性
- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)range; // 每次設置一個屬性和它對應的值
- (void)addAttributes:(NSDictionary<NSString *, id> *)attrs range:(NSRange)range; // 一次可以設置多個屬性 屬性和屬性值以字典鍵值對形式進行設置
// range參數是設置要設置屬性的字符串範圍常用的屬性都有哪些
- 字體
[attrStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:30.0f] range:NSMakeRange(4, 3)];![]()
效果圖 - 顏色
[attrStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(4, 3)];![]()
效果圖[attrStr addAttribute:NSBackgroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(4, 3)];![]()
效果圖 - 空心字
[attrStr addAttribute:NSStrokeColorAttributeName value:[UIColor redColor] range:NSMakeRange(4, 3)]; // 設置描邊顏色 要和NSStrokeWidthAttributeName設置描邊寬度一起使用 [attrStr addAttribute:NSStrokeWidthAttributeName value:@1.5 range:NSMakeRange(4, 3)];![]()
效果圖 - 間距
[attrStr addAttribute:NSKernAttributeName value:@10 // NSNumber range:NSMakeRange(4, 3)];![]()
效果圖 - 傾斜
[attrStr addAttribute:NSObliquenessAttributeName value:@(0.5f) // 正值向右傾斜 負值向左傾斜 range:NSMakeRange(4, 3)];![]()
效果圖 - 拉伸、壓縮
[attrStr addAttribute:NSExpansionAttributeName value:@(0.5f) // 正值橫向拉伸 負值橫向壓縮 range:NSMakeRange(4, 3)];![]()
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效果圖 - 連體
NSMutableAttributedString * attrStr = [[NSMutableAttributedString alloc] initWithString:@"'flush' is a string！"]; [attrStr addAttribute:NSLigatureAttributeName value:@1 range:NSMakeRange(1, 5)]; [attrStr addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"futura" size:30] range:NSMakeRange(1, 5)];
效果圖（注意fl兩個字母的連接效果）
-
基線偏移量
[attrStr addAttribute:NSBaselineOffsetAttributeName value:@(10) // 正值上偏 負值下偏 range:NSMakeRange(4, 3)];![]()
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效果圖 -
陰影
NSShadow *shadow = [[NSShadow alloc] init]; // NSShadow只有3個屬性：陰影顏色，模糊半徑和偏移 shadow.shadowOffset = CGSizeMake(3, 3); // 陰影偏移（X方向偏移和Y方向偏移） shadow.shadowBlurRadius = 1.5; // 模糊半徑 shadow.shadowColor = [UIColor redColor]; // 陰影顏色[attrStr addAttribute:NSShadowAttributeName value:shadow range:NSMakeRange(4, 3)];![]()
效果圖 - 特殊效果
[attrStr addAttribute:NSTextEffectAttributeName value:NSTextEffectLetterpressStyle // NSString類型 目前只有NSTextEffectLetterpressStyle(凸版印刷效果)可用 range:NSMakeRange(4, 3)];![]()
效果圖 - 書寫方向
[attrStr addAttribute:NSWritingDirectionAttributeName value:@[@(NSWritingDirectionRightToLeft | NSWritingDirectionOverride)] range:NSMakeRange(0, attrStr.length)];![]()
效果圖//NSWritingDirectionAttributeName 設置文字書寫方向，取值爲以下組合 // iOS9.0以前 //@[@(NSWritingDirectionLeftToRight | NSTextWritingDirectionEmbedding)] //@[@(NSWritingDirectionLeftToRight | NSTextWritingDirectionOverride)] //@[@(NSWritingDirectionRightToLeft | NSTextWritingDirectionEmbedding)] //@[@(NSWritingDirectionRightToLeft | NSTextWritingDirectionOverride)] // iOS9.0以後 //@[@(NSWritingDirectionLeftToRight | NSWritingDirectionEmbedding)] //@[@(NSWritingDirectionLeftToRight | NSWritingDirectionOverride)] //@[@(NSWritingDirectionRightToLeft | NSWritingDirectionEmbedding)] //@[@(NSWritingDirectionRightToLeft | NSWritingDirectionOverride)] // NSWritingDirectionOverride 和 NSWritingDirectionEmbedding 是指定Unicode雙向定義的格式控制算法（具體的沒太搞清楚） - 橫、豎排版
[attrStr addAttribute:NSVerticalGlyphFormAttributeName value:@0 // 0橫向排版 1豎向排版 iOS中除了0以外都未定義，所以都爲橫向排版 range:NSMakeRange(0, attrStr.length)]; -
下劃線
[attrStr addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:NSMakeRange(4, 3)];![]()
效果圖[attrStr addAttribute:NSUnderlineColorAttributeName value:[UIColor redColor] range:NSMakeRange(4, 3)];![]()
效果圖typedef NS_ENUM(NSInteger, NSUnderlineStyle) { NSUnderlineStyleNone = 0x00, NSUnderlineStyleSingle = 0x01, NSUnderlineStyleThick NS_ENUM_AVAILABLE(10_0, 7_0) = 0x02, NSUnderlineStyleDouble NS_ENUM_AVAILABLE(10_0, 7_0) = 0x09, NSUnderlinePatternSolid NS_ENUM_AVAILABLE(10_0, 7_0) = 0x0000, NSUnderlinePatternDot NS_ENUM_AVAILABLE(10_0, 7_0) = 0x0100, NSUnderlinePatternDash NS_ENUM_AVAILABLE(10_0, 7_0) = 0x0200, NSUnderlinePatternDashDot NS_ENUM_AVAILABLE(10_0, 7_0) = 0x0300, NSUnderlinePatternDashDotDot NS_ENUM_AVAILABLE(10_0, 7_0) = 0x0400, NSUnderlineByWord NS_ENUM_AVAILABLE(10_0, 7_0) = 0x8000 } NS_ENUM_AVAILABLE(10_0, 6_0); -
刪除線
[attrStr addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:NSMakeRange(4, 3)];![]()
效果圖[attrStr addAttribute:NSStrikethroughColorAttributeName value:[UIColor redColor] range:NSMakeRange(4, 3)];![]()
效果圖 - 網址
NSMutableAttributedString * attrStr = [[NSMutableAttributedString alloc] initWithString:@"這是一個網址http://www.jianshu.com/users/37f2920f6848字符串！"]; [attrStr addAttribute:NSLinkAttributeName value:@"http://www.jianshu.com/users/37f2920f6848" range:NSMakeRange(6, attrStr.length -6 -4)]; // label顯示出來的連接是點擊不了的 textView的是可以的 有響應的回調函數shouldInteractWithURL![]()
效果圖 - 圖文混排
NSMutableAttributedString * attrStr = [[NSMutableAttributedString alloc] initWithString:@"這是一個富文本字符串！"]; // 創建一個文字附件對象 NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init]; textAttachment.image = [UIImage imageNamed:@"11.png"]; //設置圖片源 textAttachment.bounds = CGRectMake(0, -6, 30, 30); //設置圖片位置和大小 // 將文字附件轉換成屬性字符串 NSAttributedString *attachmentAttrStr = [NSAttributedString attributedStringWithAttachment:textAttachment]; // 將轉換成屬性字符串插入到目標字符串 [attrStr insertAttributedString:attachmentAttrStr atIndex:8];![]()
效果圖 - 段落
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; // 行間距 paragraphStyle.lineSpacing = 15.f; // 段落間距 paragraphStyle.paragraphSpacing = 30.f; // 段落縮進像素 paragraphStyle.firstLineHeadIndent = 40.f; // 整體縮進像素 paragraphStyle.headIndent = 15.f; // 對齊方式 paragraphStyle.alignment = NSTextAlignmentLeft; // 其他屬性請自行查閱NSMutableParagraphStyle頭文件NSMutableAttributedString * attrStr = [[NSMutableAttributedString alloc] initWithString:@"這是一個富文本字符串。\n這是一個富文本字符串？\n這是一個富文本字符串！"]; [attrStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, attrStr.length)];![]()
效果圖
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