利用NSAttributedString实现图文混排

Posted 2020-10-05 黄增松的技术博客

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.

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效果如下: 
 

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

 

转自：http://blog.csdn.net/Mazy_ma/article/details/52920596