使用GDataXML解析XML数据

手动添加GDataXML方法(不使用pod的情况)
步骤：

1.png 2.png 3.png 4.png

核心代码：

#import "ViewController.h"
#import "GDataXMLNode.h"
#import "CDRelativeModel.h"
#import "CDDetailViewController.h"

@interface ViewController () <UITableViewDataSource , UITableViewDelegate>

@property (weak, nonatomic) IBOutlet UITableView *myTableView;

@end

@implementation ViewController{
    NSMutableArray<CDRelativeModel *> *_dataArray;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.automaticallyAdjustsScrollViewInsets = NO;
    
    //(黑客技)隐藏没有数据的单元格
    _myTableView.tableFooterView = [[UIView alloc] init];
    
    [self loadDataModel];
}

-(void) loadDataModel{
    _dataArray = [NSMutableArray array];
    //通过URL加载系统联网 - 基于http(s)联网系统
    NSURL *url = [NSURL URLWithString:@"http://www.oschina.net/action/api/news_detail?id=77788"];
    
    //创建POST请求
    //可变请求NSMutableURLRequest
    NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
    
    //修改请求命令
    //req.HTTPMethod = @"POST";
    //设置请求头参数
    //[req setValue:@"参数" forHTTPHeaderField:@"参数名"];
    
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *task = [session dataTaskWithRequest:req completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        //NSLog(@"%@",data);
        //解析XML
        //1.SAX - 占内存少，事件驱动式解析 - 苹果原生
        //2.DOM - 将整个文档作为一个对象加载到内存中，支持XPath查询语法，支持对节点的编辑操作 - 第三方
        
        //options:预留参数，暂时没有任何作用
        //error:错误对象
        NSError *domError = nil;
        GDataXMLDocument *dom = [[GDataXMLDocument alloc] initWithData:data options:0 error:&domError];
        if (!error){
            // "//relative":文档所有relative节点
            // "/relative":只从根节点中找relative节点
            NSArray *nodesArray = [dom nodesForXPath:@"//relative" error:nil];
            [nodesArray enumerateObjectsUsingBlock:^(GDataXMLNode *_Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
                CDRelativeModel *model = [[CDRelativeModel alloc] init];
                GDataXMLNode *rtitle = obj.children[0];
                model.title = rtitle.stringValue;
                GDataXMLNode *rurl = obj.children[1];
                model.urlStr = rurl.stringValue;
                
                [_dataArray addObject:model];
                //刷新界面
                dispatch_async(dispatch_get_main_queue(), ^{
                    [_myTableView reloadData];
                });
            }];
        }
    }];
    
    //启动任务
    [task resume];
    
    //默认GET请求
//    [session downloadTaskWithURL:url completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
//        
//    }];
    
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return _dataArray.count;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    CDRelativeModel *model = _dataArray[indexPath.row];
    cell.textLabel.text = model.title;
    return cell;
}

//使用StoryBoard连线方式跳转界面 -- 传值方法
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    //上个界面
    //segue.sourceViewController
    //要跳转的界面
    //segue.destinationViewController
    
    CDDetailViewController *detailVC = segue.destinationViewController;
    detailVC.urlStr = _dataArray[_myTableView.indexPathForSelectedRow.row].urlStr;
}

@end