項(xiàng)目中需求首行頂格,其余行縮進(jìn),剛開始想用兩個(gè)label實(shí)現(xiàn),過(guò)于麻煩,查了一下NSMutableParagraphStyle相關(guān)的屬性,輕輕松松搞定

具體實(shí)現(xiàn):
CGSize size = [model.name boundingRectWithSize:CGSizeMake(MAXFLOAT, 20) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14]} context:nil].size; NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; paragraphStyle.headIndent = size.width;//整體縮進(jìn)(首行除外) NSDictionary *attributes = @{ NSFontAttributeName:[UIFont systemFontOfSize:14], NSParagraphStyleAttributeName:paragraphStyle, }; _chatMsgLaebl.attributedText = [[NSAttributedString alloc] initWithString: self.chatMsgLaebl.text attributes:attributes];備注:// NSFontAttributeName 設(shè)置字體屬性,默認(rèn)值:字體:Helvetica(Neue) 字號(hào):12 // NSForegroundColorAttributeNam 設(shè)置字體顏色,取值為 UIColor對(duì)象,默認(rèn)值為黑色 // NSBackgroundColorAttributeName 設(shè)置字體所在區(qū)域背景顏色,取值為 UIColor對(duì)象,默認(rèn)值為nil, 透明色 // NSLigatureAttributeName 設(shè)置連體屬性,取值為NSNumber 對(duì)象(整數(shù)),0 表示沒有連體字符,1 表示使用默認(rèn)的連體字符 // NSKernAttributeName 設(shè)定字符間距,取值為 NSNumber 對(duì)象(整數(shù)),正值間距加寬,負(fù)值間距變窄 // NSStrikethroughStyleAttributeName 設(shè)置刪除線,取值為 NSNumber 對(duì)象(整數(shù)) // NSStrikethroughColorAttributeName 設(shè)置刪除線顏色,取值為 UIColor 對(duì)象,默認(rèn)值為黑色 // NSUnderlineStyleAttributeName 設(shè)置下劃線,取值為 NSNumber 對(duì)象(整數(shù)),枚舉常量 NSUnderlineStyle中的值,與刪除線類似 // NSUnderlineColorAttributeName 設(shè)置下劃線顏色,取值為 UIColor 對(duì)象,默認(rèn)值為黑色 // NSStrokeWidthAttributeName 設(shè)置筆畫寬度,取值為 NSNumber 對(duì)象(整數(shù)),負(fù)值填充效果,正值中空效果 // NSStrokeColorAttributeName 填充部分顏色,不是字體顏色,取值為 UIColor 對(duì)象 // NSShadowAttributeName 設(shè)置陰影屬性,取值為 NSShadow 對(duì)象 // NSTextEffectAttributeName 設(shè)置文本特殊效果,取值為 NSString 對(duì)象,目前只有圖版印刷效果可用: // NSBaselineOffsetAttributeName 設(shè)置基線偏移值,取值為 NSNumber (float),正值上偏,負(fù)值下偏 // NSObliquenessAttributeName 設(shè)置字形傾斜度,取值為 NSNumber (float),正值右傾,負(fù)值左傾 // NSExpansionAttributeName 設(shè)置文本橫向拉伸屬性,取值為 NSNumber (float),正值橫向拉伸文本,負(fù)值橫向壓縮文本 // NSWritingDirectionAttributeName 設(shè)置文字書寫方向,從左向右書寫或者從右向左書寫 // NSVerticalGlyphFormAttributeName 設(shè)置文字排版方向,取值為 NSNumber 對(duì)象(整數(shù)),0 表示橫排文本,1 表示豎排文本 // NSLinkAttributeName 設(shè)置鏈接屬性,點(diǎn)擊后調(diào)用瀏覽器打開指定URL地址 // NSAttachmentAttributeName 設(shè)置文本附件,取值為NSTextAttachment對(duì)象,常用于文字圖片混排 // NSParagraphStyleAttributeName 設(shè)置文本段落排版格式,取值為 NSParagraphStyle 對(duì)象 // NSParagraphStyleAttributeName 段落的風(fēng)格(設(shè)置首行,行間距,對(duì)齊方式什么的)看自己需要什么屬性,寫什么 NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; paragraphStyle.lineSpacing = 10;// 字體的行間距 paragraphStyle.firstLineHeadIndent = 20.0f;//首行縮進(jìn) paragraphStyle.alignment = NSTextAlignmentJustified;//(兩端對(duì)齊的)文本對(duì)齊方式:(左,中,右,兩端對(duì)齊,自然) paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;//結(jié)尾部分的內(nèi)容以……方式省略 ( "...wxyz" ,"abcd..." ,"ab...yz") paragraphStyle.headIndent = 20;//整體縮進(jìn)(首行除外) paragraphStyle.tailIndent = 20;// paragraphStyle.minimumLineHeight = 10;//最低行高 paragraphStyle.maximumLineHeight = 20;//最大行高 paragraphStyle.paragraphSpacing = 15;//段與段之間的間距 paragraphStyle.paragraphSpacingBefore = 22.0f;//段首行空白空間/* Distance between the bottom of the PRevious paragraph (or the end of its paragraphSpacing, if any) and the top of this paragraph. */ paragraphStyle.baseWritingDirection = NSWritingDirectionLeftToRight;//從左到右的書寫方向(一共??三種) paragraphStyle.lineHeightMultiple = 15;/* Natural line height is multiplied by this factor (if positive) before being constrained by minimum and maximum line height. */ paragraphStyle.hyphenationFactor = 1;//連字屬性 在iOS,唯一支持的值分別為0和1
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