iOS-利用NSAttributedString实现图文混排

来源：互联网发布：c语言定时器函数编辑：程序博客网时间：2024/05/18 10:04

UILabel 和 UITextView 都能添加 NSAttributedString 属性字符串,通过这一点,可以实现带有属性的文字和文字内包含图片的文本内容展示.

效果如下:
这里写图片描述

1-初始化可变属性字符串

    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]initWithString:textString];

2-设置全局字体属性(设置字体大小为14)

    [attributedString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:14] range:NSMakeRange(0, textString.length)];    [attributedString addAttribute:NSKernAttributeName value:@1 range:NSMakeRange(0, textString.length)];

上面两句代码可以简写为一句(为属性字符串同时添加多个属性)

    [attributedString addAttributes:@{NSFontAttributeName: [UIFont systemFontOfSize:14],NSKernAttributeName: @1} range:NSMakeRange(0, textString.length)];

3-修改标题文字属性

通过字符串获取范围

    [attributedString addAttributes:@{NSFontAttributeName: [UIFont systemFontOfSize:26],NSForegroundColorAttributeName: [UIColor blueColor]} range:[textString rangeOfString:@"360云盘服务转型公告"]];

4-获取一大段文字范围并修改属性

通过前后字符串获取大段字符的范围

    // 此方法可以通过string获得范围进行修改    NSRange startRange = [textString localizedStandardRangeOfString:@"我们即将采取以下措施："];    NSRange endRange = [textString localizedStandardRangeOfString:@"感谢您的一路相伴。"];    [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSUnionRange(startRange, endRange)];

5-为文本添加下划线

    // 设置文本下划线    NSRange startRange1 = [textString localizedStandardRangeOfString:@"因此，"];    NSRange endRange1 = [textString localizedStandardRangeOfString:@"之后转型企业云服务。"];    [attributedString addAttribute:NSUnderlineStyleAttributeName value:@1 range:NSUnionRange(startRange1, endRange1)];

6-为文本内文字添加描边

    // 设置文本的描边    [attributedString addAttribute:NSStrokeWidthAttributeName value:@2.0 range:[textString rangeOfString:@"存储传播非法文件、侵权盗版牟利、传播淫秽色情信息等违法犯罪行为"]];    [attributedString addAttribute:NSStrokeColorAttributeName value:[UIColor brownColor] range:[textString rangeOfString:@"存储传播非法文件、侵权盗版牟利、传播淫秽色情信息等违法犯罪行为"]];    [attributedString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:17] range:[textString rangeOfString:@"存储传播非法文件、侵权盗版牟利、传播淫秽色情信息等违法犯罪行为"]];

7-为文本添加图片附件

    // 插入图片附件    NSTextAttachment *imageAtta = [[NSTextAttachment alloc] init];    imageAtta.bounds = CGRectMake(0, 0, 375, 180);    imageAtta.image = [UIImage imageNamed:@"360"];    NSAttributedString *attach = [NSAttributedString attributedStringWithAttachment:imageAtta];    [attributedString insertAttributedString:attach atIndex:0];

8-为文本设置段落属性

    // 段落样式    NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc]init];    // 行间距    [style setLineSpacing:3];    // 段落间距    [style setParagraphSpacing:6];    // 首行缩进    [style setFirstLineHeadIndent:25];    [attributedString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(1, textString.length)];

9-添加网址链接

    // 网址链接    NSRange urlRange = [textString rangeOfString:@"yunpan.360.cn"];    [attributedString addAttribute:NSLinkAttributeName value:[NSURL URLWithString:@"http://yunpan.360.cn"] range:NSMakeRange(urlRange.location, 14)];    [attributedString addAttribute:NSBackgroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(urlRange.location, 14)];

10-通过UITextViewDelegate代理方法,监听URL和附件的点击

 #pragma mark ----------UITextViewDelegate----------- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange interaction:(UITextItemInteraction)interaction {    NSLog(@"%@",URL);    return YES;}- (BOOL)textView:(UITextView *)textView shouldInteractWithTextAttachment:(NSTextAttachment *)textAttachment inRange:(NSRange)characterRange interaction:(UITextItemInteraction)interaction {    NSLog(@"%@",textAttachment.image);    return YES;}

补充:常用属性字符串属性

    // 字体    NSFontAttributeName               // UIFont, default Helvetica(Neue) 12    // 段落    NSParagraphStyleAttributeName     // NSParagraphStyle, default defaultParagraphStyle    // 文字颜色    NSForegroundColorAttributeName    // UIColor, default blackColor    // 背景颜色    NSBackgroundColorAttributeName    // UIColor, default nil: no background    // 描边颜色    NSStrokeColorAttributeName        // UIColor, default nil: same as foreground color    // 描边宽度    NSStrokeWidthAttributeName        // NSNumber containing floating point value, default 0    // 阴影    NSShadowAttributeName             // NSShadow, default nil: no shadow    // 附件    NSAttachmentAttributeName         // NSTextAttachment, default nil    // 链接URL    NSLinkAttributeName               // NSURL (preferred) or NSString    // 基线偏移量    NSBaselineOffsetAttributeName     // NSNumber containing floating point value,default 0    // 下划线    NSUnderlineColorAttributeName      // UIColor, default nil: same as foreground color

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