#import "ViewController.h"

import "Video.h"
@interface ViewController ()<NSXMLParserDelegate>
//存儲對象數組
@property (nonatomic, strong) NSMutableArray videos;
// 來回拼接
@property (nonatomic, strong) NSMutableString elementString;
// 當前視頻信息的對象
@property (nonatomic, strong) Video *video;
@end
@implementation ViewController

(void)viewDidLoad
{
  [super viewDidLoad];
// 加載數據方法
  [self loadData];
}


pragma mark - 加載數據

(void)loadData
{
  // data
  NSString  path = [[NSBundle mainBundle] pathForResource:@"video.xml" ofType:nil];
  NSData  data = [NSData dataWithContentsOfFile:path];
// 1>創建，傳遞data
  NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
// 2> 設置代理
  parser.delegate = self;
// 3> 開始解析
  [parser parse];//返回值，判斷是否解析成功
// 4> 解析完成之后的操作
}


pragma mark - XML解析代理方法
pragma mark 1. 開始

(void)parserDidStartDocument:(NSXMLParser *)parser
{
//    NSLog(@"開始解析文檔");
  // 準備工作
  // 1> dataList
  self.videos = [NSMutableArray array];
// 2> elementString
  self.elementString = [NSMutableString string];
}


pragma mark 2. 所有開始一個節點:<element>

(void)parser:(NSXMLParser )parser didStartElement:(NSString )elementName namespaceURI:(NSString )namespaceURI qualifiedName:(NSString )qName attributes:(NSDictionary *)attributeDict
{
  NSLog(@"開始節點:=====%@ %@", elementName, attributeDict);
  // 如果是<video>新建對象
  if ([elementName isEqualToString:@"video"]) {

  self.video = [[Video alloc] init];

}
// 每開始一個新節點之前都清空elementString
  // 避免上一次的結果被重復拼接,例如拼完名字是"abc",再拼長度就會變成"vda1234"
  [self.elementString setString:@""];
}


pragma mark 3. 查找內容,可能會重復多次

(void)parser:(NSXMLParser )parser foundCharacters:(NSString )string
{
  // 拼接字符串
  [self.elementString appendString:string];
}

pragma mark 4. 節點結束 </element>

(void)parser:(NSXMLParser )parser didEndElement:(NSString )elementName namespaceURI:(NSString )namespaceURI qualifiedName:(NSString )qName
{
//    NSLog(@"結束節點 %@", elementName);
  if ([elementName isEqualToString:@"name"])
  {
  self.video.name = self.elementString；

  }
  else if ([elementName isEqualToString:@"length"])
  {
  self.video.length = self.elementString;

  }
  //將對象添加到數組
  else if([elementName isEqualToString:@"video"])
  {
  [self.videos addObject:self.video];

  }

}
pragma mark 5. 文檔結束

(void)parserDidEndDocument:(NSXMLParser )parser
{
  for (Video  video in self.videos)
  {
   NSLog(@"%@---%@", video.name, video.length);

  }
}

pragma mark 6. 出錯處理

(void)parser:(NSXMLParser )parser parseErrorOccurred:(NSError )parseError
{
  NSLog(@"%@", parseError.localizedDescription);
} </pre>