Objective c 将XML导入自定义对象？

我从web查询中返回了一些XML，其中多个参数封装在一个标记中，如下所示：

<game>
    <name>First game title</name>
    <id>12345</id>
    <desc>A game..</desc>
</game>
<game>
    <name>Second game title</name>
    <id>67890</id>
    <desc>Another game..</desc>
</game>

---

}

首先让自己成为一名游戏职业。我们将把XML解析成游戏对象

游戏。h喜欢这样：

@interface Game : NSObject

@property (nonatomic, retain) NSString *name;
@property (nonatomic, retain) NSNumber *gameID;
@property (nonatomic, retain) NSString *gameDescription;

@end

现在，在您正在解析XML的类中（在本例中为ViewController），创建一个NSMutableArray属性以在解析游戏对象时存储它们，创建新游戏对象时使用的游戏属性，一个NSString属性以在XML中存储我们正在解析的当前元素，以及一个用于我们正在使用的NSXMLParser实例的属性。还要确保它符合NSXMLParserDelegate协议

因此，标题ViewController.h：

@interface ViewController : UIViewController <NSXMLParserDelegate>

@property (nonatomic, retain) NSString *currentElement;
@property (nonatomic, retain) NSMutableArray *games;
@property (nonatomic, retain) Game *gameBeingParsed;
@property (nonatomic, retain) NSXMLParser *xmlParser;

@end

@界面ViewController:UIViewController
@属性（非原子，保留）NSString*currentElement；
@属性（非原子，保留）NSMutableArray*游戏；
@属性（非原子，保留）Game*gameBeingParsed；
@属性（非原子，保留）NSXMLParser*xmlParser；
@结束

现在在实现ViewController.m中，我们解析XML：

#import "ViewController.h"

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Make an NSMutableArray to put the parsed Game objects in
    self.games = [NSMutableArray array];

    // Get the XML data to parse
    // We need it in an NSdata object
    NSString *xmlString = @"<?xml version=\"1.0\" encoding=\"utf-8\"?><xml><game><name>First game title</name><id>12345</id><desc>A game..</desc></game><game><name>Second game title</name><id>67890</id><desc>Another game..</desc></game></xml>";
    NSData *xmlData = [xmlString dataUsingEncoding:NSStringEncodingConversionAllowLossy];

    // Set up an NSXMLParser to use
    // Set the delegate and start parsing!
    self.xmlParser = [[[NSXMLParser alloc] initWithData:xmlData] autorelease];
    _xmlParser.delegate = self;
    [_xmlParser parse];


}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict {

    // If we have a <game> tag then we are starting to parse a new Game object
    if ([elementName isEqualToString:@"game"]) {
        self.gameBeingParsed = [[[Game alloc] init] autorelease];
    }

    // If not then we need to keep track of the element name so we know which property to set on the Game object
    else {
        self.currentElement = elementName;
    }

}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {

    // If we have a closing </game> tag we are done parsing a Game so add it to the array
    if ([elementName isEqualToString:@"game"]) {
        [_games addObject:_gameBeingParsed];
    }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    // Work out which element we have the characters for
    // Then set the property of the Game object
    if ([_currentElement isEqualToString:@"name"]){
        _gameBeingParsed.name = string;
    }
    if ([_currentElement isEqualToString:@"id"]){
        _gameBeingParsed.gameID = [NSNumber numberWithInt:[string intValue]];
    }
    if ([_currentElement isEqualToString:@"name"]){
        _gameBeingParsed.gameDescription = string;
    }
}

- (void)parserDidEndDocument:(NSXMLParser *)parser{

    // We are done parsing XML
    NSLog(@"Parsed %d Games", _games.count);
    for (Game *game in _games) {
        NSLog(@"%@ : %@ : %@", game.name, game.gameID, game.gameDescription);
    }
}

#导入“ViewController.h”
@实现视图控制器
-（无效）viewDidLoad
{
[超级视图下载]；
//制作一个NSMutableArray，将解析后的游戏对象放入其中
self.games=[NSMutableArray]；
//获取要解析的XML数据
//我们需要在NSdata对象中使用它
NSString*xmlString=@“第一个游戏标题12345A游戏..第二个游戏标题67890另一个游戏..”；
NSData*xmlData=[xmlString dataUsingEncoding:nsstringencodingconversionlowlossy]；
//设置要使用的NSXMLParser
//设置委托并开始解析！
self.xmlParser=[[NSXMLParser alloc]initWithData:xmlData]autorelease]；
_xmlParser.delegate=self；
[_xmlparserparse]；
}
-（void）parser:（NSXMLParser*）parser didStartElement:（NSString*）elementName namespaceURI:（NSString*）namespaceURI qualifiedName:（NSString*）qualifiedName属性：（NSDictionary*）attributeDict{
//如果我们有一个标签，那么我们开始解析一个新的游戏对象
if（[elementName IsequalString:@“game”]）{
self.gameBeingParsed=[[[Game alloc]init]autorelease]；
}
//如果没有，那么我们需要跟踪元素名称，以便知道在游戏对象上设置哪个属性
否则{
self.currentElement=elementName；
}
}
-（void）parser:（NSXMLParser*）parser didEndElement:（NSString*）elementName namespaceURI:（NSString*）namespaceURI qualifiedName:（NSString*）qName{
//如果我们有一个结束标记，我们就完成了对游戏的解析，所以将它添加到数组中
if（[elementName IsequalString:@“game”]）{
[\u games addObject:\u gamesbeingparsed]；
}
}
-（void）解析器：（NSXMLParser*）解析器查找字符：（NSString*）字符串
{
//找出我们有哪些元素的字符
//然后设置游戏对象的属性
if（[\u currentElement IsequalString:@“name”]）{
_gameBeingParsed.name=字符串；
}
if（[\u currentElement IsequalString:@“id”]）{
_gameBeingParsed.gameID=[NSNumber numberWithInt:[string intValue]]；
}
if（[\u currentElement IsequalString:@“name”]）{
_gameBeingParsed.gameDescription=字符串；
}
}
-（void）parserDidEndDocument:（NSXMLParser*）解析器{
//我们已经完成了XML解析
NSLog（@“已解析%d个游戏”，_Games.count）；
用于（游戏*游戏中的游戏）{
NSLog（@“%@:%@:%@”、game.name、game.gameID、game.gameDescription）；
}
}

---

解析完成后，我们在parserDidEndDocument中得到一个回调：此时，将填充_games属性，以创建游戏实例。

我的解释有意义吗？我意识到我基本上只是为了回应而转储了一堆代码，所以我也尝试添加一些解释。

#import "ViewController.h"

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Make an NSMutableArray to put the parsed Game objects in
    self.games = [NSMutableArray array];

    // Get the XML data to parse
    // We need it in an NSdata object
    NSString *xmlString = @"<?xml version=\"1.0\" encoding=\"utf-8\"?><xml><game><name>First game title</name><id>12345</id><desc>A game..</desc></game><game><name>Second game title</name><id>67890</id><desc>Another game..</desc></game></xml>";
    NSData *xmlData = [xmlString dataUsingEncoding:NSStringEncodingConversionAllowLossy];

    // Set up an NSXMLParser to use
    // Set the delegate and start parsing!
    self.xmlParser = [[[NSXMLParser alloc] initWithData:xmlData] autorelease];
    _xmlParser.delegate = self;
    [_xmlParser parse];


}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict {

    // If we have a <game> tag then we are starting to parse a new Game object
    if ([elementName isEqualToString:@"game"]) {
        self.gameBeingParsed = [[[Game alloc] init] autorelease];
    }

    // If not then we need to keep track of the element name so we know which property to set on the Game object
    else {
        self.currentElement = elementName;
    }

}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {

    // If we have a closing </game> tag we are done parsing a Game so add it to the array
    if ([elementName isEqualToString:@"game"]) {
        [_games addObject:_gameBeingParsed];
    }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    // Work out which element we have the characters for
    // Then set the property of the Game object
    if ([_currentElement isEqualToString:@"name"]){
        _gameBeingParsed.name = string;
    }
    if ([_currentElement isEqualToString:@"id"]){
        _gameBeingParsed.gameID = [NSNumber numberWithInt:[string intValue]];
    }
    if ([_currentElement isEqualToString:@"name"]){
        _gameBeingParsed.gameDescription = string;
    }
}

- (void)parserDidEndDocument:(NSXMLParser *)parser{

    // We are done parsing XML
    NSLog(@"Parsed %d Games", _games.count);
    for (Game *game in _games) {
        NSLog(@"%@ : %@ : %@", game.name, game.gameID, game.gameDescription);
    }
}