NSMutableAttributedString可变属性字符串的用法

适用于：当你想对一个字符串中的某几个字符更改颜色，字体。。。

　　　NSString *string = @"今日营养配餐提供热量1800千卡，需要饮食之外额外补充钙10mg，铁20mg，锌9.5mg，叶酸200μgDFE，维生素D 10ug，维生素B1 1.2mg，维生素B2 1.2mg。";

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

        NSRange range = [string rangeOfString:@"今日营养配餐"];

        [attributedString addAttribute:NSForegroundColorAttributeName value:JYEColor(72, 75, 91) range:range];

        [attributedString addAttribute:NSFontAttributeName value:[self jyeFontWithName:@"PingFangSC-Medium" size:13] range:range];

        hotLabel.attributedText = attributedString;

使用场景：处理 属性字符串 文字居中

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

            paragrapStyle.alignment = NSTextAlignmentCenter;//文字居中属性

　　　　NSString * shareCountStr = [NSString stringWithFormat:@"———已有%@人分享———",self.dishAdviceShareCountString];

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

            NSRange range = [shareCountStr rangeOfString:self.dishAdviceShareCountString];//人数 做颜色处理

            [attributedString addAttribute:NSForegroundColorAttributeName value:JYEColor(255, 48, 99) range:range];

            [attributedString addAttribute:NSFontAttributeName value:[JYEToolModel jyeFontWithName:@"PingFangSC-Regular" size:12] range:range];

            [attributedString addAttribute:NSParagraphStyleAttributeName value:paragrapStyle range:range];

            shareNumLabel.attributedText = attributedString;