gistfile1.m

 originTextArray=[NSMutableArray arrayWithCapacity:0];
    transTextArray=[NSMutableArray arrayWithCapacity:0];
    
    NSString *rex=@"<[^>]*?>([^<]*)";
    NSArray *r=[self.item.summary arrayOfCaptureComponentsMatchedByRegex:rex];
    
    BOOL judge=YES;
    for(NSArray *tmp in r){
        NSString *content=[tmp objectAtIndex:1];
        //过滤连续标签中间的空内容
        if(content.length>0){
            //judge为YES，判断为原文
            if(judge){
                [originTextArray addObject:content];
                judge=NO;
            }else {
                [transTextArray addObject:content];
                judge=YES;
            }
        }
    }
    //
    NSMutableString *tmp=[NSMutableString string];
    //下面的if语句防止当原文和翻译段落不相等程序出现崩溃
    if(originTextArray.count>=transTextArray.count){
        for(int i=0;i<originTextArray.count;i++){
            [tmp appendString:[originTextArray objectAtIndex:i]];
            //换行符
            [tmp appendString:@"\n\n"];
            if(transTextArray.count>=i){
                [tmp appendString:[transTextArray objectAtIndex:i]];
                [tmp appendString:@"\n\n"];
            }
        }
    }
    _textView.text=tmp;