方法基本
//3.创建模型对象
for ele in tweetNodes {

        let model = TweetModel()
        
        model.id = ele.elementsForName("id").last?.stringValue()
        model.portrait = ele.elementsForName("portrait").last?.stringValue()
        model.author = ele.elementsForName("author").last?.stringValue()
        
        model.authorid = ele.elementsForName("authorid").last?.stringValue()
        model.body = ele.elementsForName("body").last?.stringValue()
        model.attach = ele.elementsForName("attach").last?.stringValue()
        
        model.appclient = ele.elementsForName("appclient").last?.stringValue()
        model.commentCount = ele.elementsForName("commentCount").last?.stringValue()
        model.pubDate = ele.elementsForName("pubDate").last?.stringValue()
        
        model.imgSmall = ele.elementsForName("imgSmall").last?.stringValue()
        model.imgBig = ele.elementsForName("imgBig").last?.stringValue()
        model.likeCount = ele.elementsForName("likeCount").last?.stringValue()
        
        model.isLike = ele.elementsForName("isLike").last?.stringValue()
        model.likeList = ele.elementsForName("likeList").last?.stringValue()
        
        //id portrait author authorid body attach  appclient commentCount  pubDate imgSmall imgBig likeCount isLike likeList

        
       
        self.dataArray.addObject(model)
        
    }

2，方法 好用

func parseModel(element: GDataXMLElement, nameArray: Array<String>) -> TweetModel {

    let model = TweetModel()
    
    for name in nameArray {
        
        let value = element.elementsForName(name).last!.stringValue()
        //构造setter方法
        //id -> setId:
        //name -> setName:
        
        let index = name.startIndex.successor()
        let setterName = String(format: "set%@%@:", name.substringToIndex(index).capitalizedString, name.substringFromIndex(index))
        print(setterName)
        
        //字符串转换成方法
        let sel = NSSelectorFromString(setterName)
        
        model.performSelector(sel, withObject: value)
        
    }
    
    return model
}

//upper 调用

    for ele in tweetNodes {
        
        
        
        
        let nameArray = ["id", "portrait", "author", "authorid", "body", "attach",  "appclient", "commentCount",  "pubDate", "imgSmall", "imgBig", "likeCount", "isLike", "likeList"]
        let model = self.parseModel(ele, nameArray: nameArray)
        
        self.dataArray.addObject(model)
        
    }

3， 方 法 ＋

func parseModel(element: GDataXMLElement, nameArray: Array<String>, className: String) -> NSObject {

    //创建对象
    //Class
    let cls = NSClassFromString(className) as! NSObject.Type
    let model = cls.init()

    
    for name in nameArray {
        
        let value = element.elementsForName(name).last!.stringValue()
        //构造setter方法
        //id -> setId:
        //name -> setName:
        
        let index = name.startIndex.successor()
        let setterName = String(format: "set%@%@:", name.substringToIndex(index).capitalizedString, name.substringFromIndex(index))
        //print(setterName)
        
        //字符串转换成方法
        let sel = NSSelectorFromString(setterName)
        
        model.performSelector(sel, withObject: value)
        
    }
    
    return model
}

//upper 调用

    for ele in tweetNodes {
        
        
        
        
        let nameArray = ["id", "portrait", "author", "authorid", "body", "attach",  "appclient", "commentCount",  "pubDate", "imgSmall", "imgBig", "likeCount", "isLike", "likeList"]
        let model = self.parseModel(ele, nameArray: nameArray, className: "_3_TestOSChina.TweetModel")
        
        self.dataArray.addObject(model)
        
    }