从xml文件中获取数据的有效和简单的方法

Question

我知道有几种方法可以使用NSXMLParser, RaptureXML, TouchXML等来解析xml文件的数据，但是当我使用NSXMLParser方法时，它似乎是一个漫长的过程，因为我们必须声明字符串，数组等。我有一个xml文件，大约有7个类别，也有3个级别，我的xml文件是以下格式，它被复制到我的项目的支持文件文件夹。请你看一眼，以便理解。

我有大约21个标签，我需要从每个类别中获取数据，这意味着我需要声明大约21个数组，单独的字符串等，如果我没有错!

我试图从一个类别中获取数据，动物一级。但是我观察到数组中没有数据，我不知道如何从这里继续:

-(void)parseAndFetchWords
{
    self.animalsWordsArray = [NSMutableArray array];
    NSString *xmlFilePath = [[NSBundle bundleForClass:[self class]] pathForResource:@"strings" ofType:@"xml"];
    NSURL *xmlLocationURL = [NSURL URLWithString:xmlFilePath];
    self.parser = [[NSXMLParser alloc] initWithContentsOfURL:xmlLocationURL];
    [parser setDelegate:self];
    [parser setShouldProcessNamespaces:NO];
    [parser setShouldReportNamespacePrefixes:NO];
    [parser setShouldResolveExternalEntities:NO];
    [parser parse];
}
#pragma mark - Parser Delegate
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    currentElement = nil;
    currentElement = [elementName copy];
    if ([elementName isEqualToString:@"animalLevelOne"])
    {
        self.animalName = [NSMutableString string];
        self.animalHint = [NSMutableString string];
    }
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    string = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    string = [string stringByTrimmingCharactersInSet:[NSCharacterSet controlCharacterSet]];
    if ([currentElement isEqualToString:@"animalLevelOne"])
    {
        [animalName appendString:string];
    }
    else if ([currentElement isEqualToString:@"animalLevelOne"])
    {
        [animalHint appendString:string];
    }
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if ([elementName isEqualToString:@"animalLevelOne"])
    {
        NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
        [dictionary setObject:animalName forKey:@"animalName"];
        [dictionary setObject:animalHint forKey:@"animalHint"];
        //And finally
        [self.animalsWordsArray addObject:dictionary];
    }
}

可以有人建议一个更好的和简单的方法来获取数据从xml，可能没有解析，如转换xml到plist文件或字典等，通过代码优化也可以实现

Answer 1

我发现了一个很酷的解决方案，如何解析xml文件没有任何麻烦。

取一个模型类并将其命名为带有头文件和主文件的XMLParser，在模型类中声明所有必要的变量和方法，在我的情况下说它是:

@property(strong,nonatomic) NSMutableString *currentElementValue;
@property(strong,nonatomic) wordJumblesAppDelegate *appDelegate;
@property(strong,nonatomic) NSMutableArray *objects;
//Method for parsing....
-(XMLParser *)initXMLParser;

请理解currentElementValue是整个xml文件的每个标签的值，appDelegate对象被声明为将所有解析过的数据存储在委托类中声明的字典中。对象只是一个数组，用于存储每个标签的所有值。

现在让我们继续执行

-(XMLParser *)initXMLParser
{
    self = [super init];
    self.appDelegate = (gameAppDelegate *)[[UIApplication sharedApplication]delegate];
    return self;
}

实现解析器委托方法:

//Start parsing the xml file using did start element
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDictionary
{
    if([elementName isEqualToString:@"resources"])
    {
        appDelegate.categoryWords = [NSMutableDictionary dictionary];
    }
    else if([elementName isEqualToString:@"string-array"])
    {
        self.objects = [NSMutableArray array];
        if (objects)
        {
            [appDelegate.categoryWords setObject:objects forKey:[attributeDictionary objectForKey:@"name"]];
        }
    }
}
//Search for characters in each tag and assign the value to our currentElementValue
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    if(!currentElementValue)
    {
        self.currentElementValue = [[NSMutableString alloc] initWithString:string];
    }
    else
    {
        [currentElementValue appendString:string];
    }
}
//Finally add the currentElementValue to our objects array
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if([elementName isEqualToString:@"resources"])
        return;
    if([elementName isEqualToString:@"string-array"])
    {
    }
    else
    {
        [objects  addObject:currentElementValue];
    }
    self.currentElementValue = nil;
}

请注意，我们将对象数组存储在应用程序委托文件中声明的类别词字典中，以便我们可以使用字典访问项目中需要的xml文件的所有值。

最后在didfinish启动方法中在应用程序启动期间执行必要的解析，即:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
    NSString *xmlFilePath = [[NSBundle mainBundle]pathForResource:@"categoryWords" ofType:@"xml"];
    NSURL *url = [NSURL fileURLWithPath:xmlFilePath];
    NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:url];
    //Initialize the delegate.
    XMLParser *parser = [[XMLParser alloc] initXMLParser];
    //Set delegate
    [xmlParser setDelegate:(id)parser];
    //Start parsing the XML file.
    BOOL success = [xmlParser parse];
    if(success)
);
    else
        NSLog(@"Error Error Error!!!");
return YES;
}

从categoryWords字典

检索数据的示例代码

NSArray *allCategories = [applicationDelegate.categoryWords allKeys];
for (NSString *category in allCategories)
{
   if ([category isEqualToString:@"animalLevelOne"])
   {
      NSArray *animalsEasyData = [NSArray arrayWithObject:[applicationDelegate.categoryWords objectForKey:category]];
      for (NSArray *animalsEasy in animalsEasyData)
      {
         for (NSString *animal in animalsEasy)
         {
            NSArray *trimmedAnimalsEasyData = [animal componentsSeparatedByString:@"@"];
            [self.animalsEasyWords addObject:[trimmedAnimalsEasyData objectAtIndex:0]];
            [self.animalsEasyHints addObject:[trimmedAnimalsEasyData objectAtIndex:1]];
         }
      }
   }
}

希望这能帮助到一些人，谢谢，快乐的编码:)

Answer 2

请尝试此代码将doctionary存储在.plist

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *docFilePath = [documentsDirstringByAppendingPathComponent:@"UserSettings.plist"];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithCapacity:0];
// add the data to dict here
[dict setObject:allMsgs forKey:@"allMsgsKey"];
// save the data as plist`enter code here`
[dict writeToFile:docFilePath atomically:YES];
[dict release];