littleWhale 
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NSString *newNameStr = nil;
    if(originStr.length > 1){
        NSMutableString *mStr = [[NSMutableString alloc] init];
        if(_range.location > 0){
            //在中间或者在末尾插入@,取出之前的，再取出之后的。
            NSString *beforeStr = [originStr substringWithRange:NSMakeRange(0, _range.location)];
            [mStr appendString:beforeStr];
            BOOL bCenterInsertFlag = NO;
            BOOL bNeedInsertAtFlag = YES;
            if(_range.location + 1 < originStr.length){
                bCenterInsertFlag = YES;

                //中间插入.判断前一个是否@
                NSString *lastChar = [beforeStr substringFromIndex:beforeStr.length-1];
                if([lastChar isEqualToString:@"@"]){
                    bNeedInsertAtFlag = NO;
                }

                if(beforeStr.length > 2 && beforeStr.length-2 > 0){
                    NSString *lastTwoChar = [beforeStr substringFromIndex:beforeStr.length-2];
                    if([lastTwoChar isEqualToString:@"@@"]){
                        [mStr replaceOccurrencesOfString:@"@@" withString:@"@" options:nil range:NSMakeRange(0, mStr.length)];
                    }
                }

            }else{
                //末尾插入.判断前一个是否@
                NSString *lastChar = [beforeStr substringFromIndex:beforeStr.length-1];
                if([lastChar isEqualToString:@"@"]){
                    bNeedInsertAtFlag = NO;
                }
            }

            if(bNeedInsertAtFlag){
                [mStr appendString:@"@"];
            }
            [mStr appendString:nameStr];
            if(bCenterInsertFlag){ //如果在文字中间插入,拿到@之后的字符串
                NSString *afterStr = [originStr substringFromIndex:_range.location+1];
                [mStr appendString:afterStr];
            }
        }else{
            //首字母为@符号，截取之后的.
            [mStr appendString:@"@"];
            [mStr appendString:nameStr];
            NSString *afterStr = [originStr substringFromIndex:1];
            [mStr appendString:afterStr];
        }
        newNameStr = mStr;
    }else{
        newNameStr = [NSString stringWithFormat:@"%@%@",mutableStr,nameStr];
    }

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