ios开发之属性字符串NSAttributeString与NSString相互转换包含图片

分享几个常用的 属性字符串NSAtrributeString 和 NSString 普通字符串的 转换方法:

 

 

一:把普通的字符串,替换为包含图片的属性字符串

plist 文件,图片 格式见下图:

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+(NSMutableAttributedString *)stringToAttributeString:(NSString *)text {     //先把普通的字符串text转化生成Attributed类型的字符串     NSMutableAttributedString * attStr = [[NSMutableAttributedString alloc]initWithString:text];           NSString * zhengze = @\[[a-zA-Z0-9\u4e00-\u9fa5]+\]; //正则表达式 ,例如  [呵呵] 这种形式的通配符           NSError * error;

1	<span style="font-family:"> NSRegularExpression * re = [NSRegularExpression regularExpressionWithPattern:zhengze options:NSRegularExpressionCaseInsensitive error:&error];//正则表达式</span>

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if (!re)     {         NSLog(@%@,[error localizedDescription]);//打印错误     }           NSArray * arr = [re matchesInString:text options:0 range:NSMakeRange(0, text.length)];//遍历字符串,获得所有的匹配字符串           NSBundle *bundle = [NSBundle mainBundle];     NSString * path = [bundle pathForResource:@emotions ofType:@plist];  //plist文件,制作一个 数组,包含文字,表情图片名称     NSArray * face = [[NSArray alloc]initWithContentsOfFile:path];  //获取 所有的数组           //如果有多个表情图，必须从后往前替换，因为替换后Range就不准确了     for (int j =(int) arr.count - 1; j >= 0; j--) {         //NSTextCheckingResult里面包含range         NSTextCheckingResult * result = arr[j];                   for (int i = 0; i < face.count; i++) {             if ([[text substringWithRange:result.range] isEqualToString:face[i][@chs]])//从数组中的字典中取元素             {                 NSString * imageName = [NSString stringWithString:face[i][@png]];                                   NSTextAttachment * textAttachment = [[NSTextAttachment alloc]init];//添加附件,图片                                   textAttachment.image = [UIImage imageNamed:imageName];                                   NSAttributedString * imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];                                   [attStr replaceCharactersInRange:result.range withAttributedString:imageStr];//替换未图片附件                                   break;             }         }     }     return attStr; }

二:获取属性字符串的size大小:

注:对包含文字和图片的属性字符串,需要根据实际情况,调节其大小

 

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+(CGSize)getAttributedTextSize:(NSString *)text {     //先把普通的字符串text转化生成Attributed类型的字符串     NSMutableAttributedString * attStr = [[NSMutableAttributedString alloc]initWithString:text];           NSString * zhengze = @\[[a-zA-Z0-9\u4e00-\u9fa5]+\];           NSError * error;           NSRegularExpression * re = [NSRegularExpression regularExpressionWithPattern:zhengze options:NSRegularExpressionCaseInsensitive error:&error];     if (!re)     {         NSLog(@正则表达式匹配错误%@,[error localizedDescription]);     }           NSArray * arr = [re matchesInString:text options:0 range:NSMakeRange(0, text.length)];                 if (!arr.count)//说明字符串中没有表情通配符,是普通的文本,则计算文本size     {         NSDictionary *dic=@{NSFontAttributeName: [UIFont systemFontOfSize:14]};                             CGSize size1=[text boundingRectWithSize:CGSizeMake(160, 1000) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;                   if (size1.height<=60)         {             size1.height=60;         }                   else         {             size1.height+=15;         }                                       return size1;     }           NSBundle *bundle = [NSBundle mainBundle];     NSString * path = [bundle pathForResource:@emotions ofType:@plist];     NSArray * face = [[NSArray alloc]initWithContentsOfFile:path];           //如果有多个表情图，必须从后往前替换，因为替换后Range就不准确了     for (int j =(int) arr.count - 1; j >= 0; j--) {         //NSTextCheckingResult里面包含range         NSTextCheckingResult * result = arr[j];                   for (int i = 0; i < face.count; i++) {             if ([[text substringWithRange:result.range] isEqualToString:face[i][@chs]])             {                 NSString * imageName = [NSString stringWithString:face[i][@png]];                                   NSTextAttachment * textAttachment = [[NSTextAttachment alloc]init];                                   textAttachment.image = [UIImage imageNamed:imageName];                                   NSAttributedString * imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];                                   [attStr replaceCharactersInRange:result.range withAttributedString:imageStr];                                   break;             }         }     }           CGSize size2=[attStr boundingRectWithSize:CGSizeMake(180, 1000) options:NSStringDrawingUsesLineFragmentOrigin context:nil].size;           size2.height+=40;  //表情文字增加高度                       return size2;//返回属性字符串的尺寸 }

三: 属性字符串转为普通字符串, 关键点: 图片的二进制比对(可以放入到一个 子线程去做)

 

图片二进制比对,获得图片名称:

 

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//不能直接得到串的名字? -(NSString *)stringFromImage:(UIImage *)image {     NSArray *face=[self getAllImagePaths];           NSData * imageD = UIImagePNGRepresentation(image);           NSString * imageName;           for (int i=0; i<face.count; bundle="[NSBundle" data="UIImagePNGRepresentation(image);" emotions="" face="[[NSArray" getallimagepaths="" if="" image="[UIImage" imaged="" imagename="face[i][@chs];" nsarray="" nsbundle="" nsdata="" nsstring="" path="[bundle" pre="" return="" uiimage="">属性字符串转换为普通字符串:<p> </p><p>假设为TextView,label,button同理</p><p> </p><pre class="brush:java;">//把带有图片的属性字符串转成普通的字符串 -(NSString *)textString {     NSAttributedString * att = self.attributedText;           NSMutableAttributedString * resutlAtt = [[NSMutableAttributedString alloc]initWithAttributedString:att];                 __weak __block UITextView * copy_self = self;     //枚举出所有的附件字符串     [att enumerateAttributesInRange:NSMakeRange(0, att.length) options:NSAttributedStringEnumerationReverse usingBlock:^(NSDictionary *attrs, NSRange range, BOOL *stop) {         //key-NSAttachment         //NSTextAttachment value类型         NSTextAttachment * textAtt = attrs[@NSAttachment];//从字典中取得那一个图片         if (textAtt)         {             UIImage * image = textAtt.image;             NSString * text = [copy_self stringFromImage:image];             [resutlAtt replaceCharactersInRange:range withString:text];                       }                         }];                 return resutlAtt.string; } </pre> <br> <p> </p> <p> </p> <p> </p> </face.count;>