UILabel富文本 段落格式以及UILabel添加图片

之前文本整理有一点乱,这边重新整理一下,下面是效果图,一共两个UILabel,

富文本整理:

 /*NSForegroundColorAttributeName设置字体颜色,对象UIColor;
     NSParagraphStyleAttributeName设置段落格式,对象NSMutableParagraphStyle;
     NSFontAttributeName设置字体,对象UIFont;
     NSBackgroundColorAttributeName设置背景颜色,对象UIColor;
     NSKernAttributeName设置字符间距,对象NSNumber
     NSStrikethroughStyleAttributeName是指删除线样式 对象NSUnderlineStyle
     NSStrikethroughColorAttributeName删除线颜色,对象UIColor
     NSUnderlineStyleAttributeName设置下划线,参考删除线
     NSUnderlineColorAttributeName设置下划线颜色
     NSStrokeWidthAttributeName设置笔画宽度,对象NSNumber,负值填充效果,正值中空效果
     NSStrokeColorAttributeName当文字中空或者填充设置文字的描边颜色,对象UIColor;
     NSShadowAttributeName 设置阴影,NSShadow对象
     NSBaselineOffsetAttributeName设置基线偏移值,对象NSNumber (float),正值上偏,负值下偏
     NSObliquenessAttributeName设置字形倾斜度,对象NSNumber (float),正值右倾,负值左倾
     NSExpansionAttributeName 设置文本横向拉伸属性,对象NSNumber (float),正值横向拉伸文本,负值横向压缩文本
     NSVerticalGlyphFormAttributeName   设置文字排版方向,取值为 NSNumber 对象(整数),0 表示横排文本,1 表示竖排文本
     NSLinkAttributeName设置链接属性,点击后调用浏览器打开指定URL地址,对象NSString,NSUrl,这个只能UITextView可用UITextView的代理方法中shouldInteractWithURL返回true可用
      NSTextEffectAttributeName设置文本特殊效果,目前只有一个可用效果  NSTextEffectLetterpressStyle(凸版印刷效果
      设置连体属性,取值为NSNumber 对象(整数),0 表示没有连体字符,1 表示使用默认的连体字符//没有测出效果
     */

源码展示:

 NSString *text = @"池塘大桥下,游过一群鸭,快来快来数一数,二四六七八,嘎嘎嘎嘎,真呀真多呀,fly,数不清到底多少鸭";
    NSMutableParagraphStyle * paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    //行间距为
    [paragraphStyle setLineSpacing:8];
    NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:text attributes:@{NSForegroundColorAttributeName :  [UIColor blueColor], NSParagraphStyleAttributeName: paragraphStyle,  NSFontAttributeName:[UIFont boldSystemFontOfSize:18]}] ;

    //设置特殊字体文本格式
    NSRange range = [text rangeOfString:@"池塘大桥下"];
    [string addAttributes:@{NSForegroundColorAttributeName:[UIColor redColor],
                            NSFontAttributeName:[UIFont boldSystemFontOfSize:12],NSBackgroundColorAttributeName:[UIColor yellowColor],NSKernAttributeName:@(12),NSStrikethroughStyleAttributeName:@(NSUnderlineStyleDouble),NSStrikethroughColorAttributeName:[UIColor purpleColor]} range:range];//添加属性
    
    NSRange range1 = [text rangeOfString:@"游过"];
    [string addAttributes:@{NSStrokeWidthAttributeName:@(-2),NSStrokeColorAttributeName:[UIColor redColor]} range:range1];//添加属性
    
    
    NSRange range2 = [text rangeOfString:@"一群鸭"];
    NSShadow *shadow = [NSShadow new];
    [shadow setShadowColor:[UIColor redColor]];
    [shadow setShadowOffset:CGSizeMake(5.0f, 5.0f)];//设置x,y轴偏移量
    [shadow setShadowBlurRadius:1.0];//设置模糊度
    [string addAttributes:@{NSShadowAttributeName:shadow} range:range2];//添加属性

    NSRange range3 = [text rangeOfString:@"快来快来"];
    [string addAttributes:@{NSBaselineOffsetAttributeName:@(10)} range:range3];//添加属性
    
    NSRange range4 = [text rangeOfString:@"数一数"];
    [string addAttributes:@{NSObliquenessAttributeName:@(0.5)} range:range4];//添加属性
    NSRange range5 = [text rangeOfString:@"二四"];
    [string addAttributes:@{NSExpansionAttributeName:@(0.8)} range:range5];//添加属性
    NSRange range6 = [text rangeOfString:@"六七八"];
    [string addAttributes:@{NSExpansionAttributeName:@(-0.8)} range:range6];//添加属性
    
    /**
     没有测出具体的区别
      NSWritingDirectionAttributeName    设置文字书写方向,从左向右书写或者从右向左书写
     @[@(NSWritingDirectionLeftToRight | NSWritingDirectionEmbedding)]
     @[@(NSWritingDirectionLeftToRight | NSWritingDirectionOverride)]
     @[@(NSWritingDirectionRightToLeft | NSWritingDirectionEmbedding)]
     @[@(NSWritingDirectionRightToLeft | NSWritingDirectionOverride)]
     */

    [string addAttributes:@{NSWritingDirectionAttributeName:@[@(NSWritingDirectionRightToLeft | NSWritingDirectionEmbedding)]} range:NSMakeRange(0, text.length)];//添加属性
    
    [string addAttributes:@{NSVerticalGlyphFormAttributeName:@1} range:NSMakeRange(0, text.length)];//添加属性
    
    NSRange range8 = [text rangeOfString:@"嘎嘎嘎嘎"];
    NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
    [string addAttributes:@{NSLinkAttributeName:url} range:range8];//添加属性
    NSRange range9 = [text rangeOfString:@"真呀真多呀"];
    [string addAttributes:@{NSTextEffectAttributeName:NSTextEffectLetterpressStyle} range:range9];//添加属性
    NSRange range10 = [text rangeOfString:@"fly"];
    [string addAttributes:@{NSLigatureAttributeName:@0} range:range10];//添加属性
    
    self.label.attributedText = string;

NSMutableParagraphStyle用法整理:

    NSTextAttachment *attachment = [[NSTextAttachment alloc] init];

    //使用一张图片作为Attachment数据

    attachment.image = [UIImage imageNamed:@"chepaihao"];

    //这里bounds的x值并不会产生影响

    attachment.bounds = CGRectMake(5,  (self.label1.font.lineHeight - self.label1.font.pointSize) / 2, 20, 10);

    

    NSMutableParagraphStyle * paragraphStyle1 = [[NSMutableParagraphStyle alloc] init];

    [paragraphStyle1 setLineSpacing:20];

    //首行缩进

    [paragraphStyle1 setFirstLineHeadIndent:20];

    [paragraphStyle1 setLineBreakMode:NSLineBreakByTruncatingMiddle];

    //两端对齐的)文本对齐方式

        paragraphStyle1.minimumLineHeight = 10;//最低行高

        paragraphStyle1.maximumLineHeight = 20;//最大行高

        paragraphStyle1.paragraphSpacing = 45;//段与段之间的间距

//    paragraphStyle1.paragraphSpacingBefore = 1000;//段首行空白空间

        paragraphStyle1.baseWritingDirection = NSWritingDirectionLeftToRight;//从左到右的书写方向(一共➡️三种)

//        paragraphStyle1.lineHeightMultiple = -100;没有测出效果

    //    paragraphStyle1.hyphenationFactor = 1;//连字属性 在iOS,唯一支持的值分别为0和1

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:@"你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人" attributes:@{NSParagraphStyleAttributeName: paragraphStyle1}];

        [attributedString appendAttributedString:[NSAttributedString attributedStringWithAttachment:attachment]];

        [attributedString appendAttributedString:[NSAttributedString attributedStringWithAttachment:attachment]];

        [attributedString appendAttributedString:[[NSMutableAttributedString alloc] initWithString:@"
你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人,你是一个好人" attributes:@{NSParagraphStyleAttributeName: paragraphStyle1}]];

        [attributedString appendAttributedString:[NSAttributedString attributedStringWithAttachment:attachment]];

    self.label1.backgroundColor = [UIColor redColor];

    //    self.label1.textAlignment = NSTextAlignmentCenter;

    self.label1.attributedText = attributedString;

    //    self.label1.lineBreakMode = NSLineBreakByCharWrapping;

获取富文本的高度和普通label的高度一样:

CGSize attSize = [string boundingRectWithSize:CGSizeMake(width, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading context:nil].size;

注意事项:我们设置NSMutableParagraphStyle的lineSpacing可能和我们想象的不大一样,间距会比我们想象的高一点点,如果我们设置10个像素,就需要这么设置,减去系统自带的间距

paragraphStyle.lineSpacing 10 - (label.font.lineHeight - label.font.pointSize);

原文地址:https://www.cnblogs.com/hualuoshuijia/p/5732619.html