将对象添加到NSMutableArray时，从XML文件解析时，顺序似乎很奇怪

I am parsing an XML file for two elements: "title" and "noType". Once these are parsed, I am adding them to an object called aMaster, an instance of my own Master class that contains NSString variables.

我正在解析两个元素的XML文件:“title”和“noType”。解析完这些后,我将它们添加到一个名为aMaster的对象中,该对象是我自己的Master类的一个实例,它包含NSString变量。

I am then adding these instances to an NSMutableArray on a singleton, in order to call them elsewhere in the program. The problem is that when I call them, they don't seem to be on the same NSMutableArray index... each index contains either the title OR the noType element, when it should be both... can anyone see what I may be doing wrong? Below is the code for the parser. Thanks so much!!

然后我将这些实例添加到单例上的NSMutableArray,以便在程序的其他地方调用它们。问题是,当我调用它们时,它们似乎不在同一个NSMutableArray索引上...每个索引都包含标题或noType元素,当它应该是两者时......任何人都可以看到我可能是什么做错了?下面是解析器的代码。非常感谢!!

#import "XMLParser.h"
#import "Values.h"
#import "Listing.h"
#import "Master.h"

@implementation XMLParser

@synthesize sharedSingleton, aMaster;

- (XMLParser *) initXMLParser {

    [super init];
    sharedSingleton = [Values sharedValues];
    aMaster = [[Master init] alloc];
    return self;
}

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

    aMaster = [[Master alloc] init];

        //Extract the attribute here.

    if ([elementName isEqualToString:@"intro"]) {
        aMaster.intro = [attributeDict objectForKey:@"enabled"];
    } else if ([elementName isEqualToString:@"item"]) {
        aMaster.item_type = [attributeDict objectForKey:@"type"];
        //NSLog(@"Did find item with type %@", [attributeDict objectForKey:@"type"]);

        //NSLog(@"Reading id value :%@", aMaster.item_type);
    } else {
        //NSLog(@"No known elements");
    }

    //NSLog(@"Processing Element: %@", elementName);    //HERE
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { 

    if(!currentElementValue) 
        currentElementValue = [[NSMutableString alloc] initWithString:string];
    else {
        [currentElementValue appendString:string];//[tempString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];
        CFStringTrimWhitespace((CFMutableStringRef)currentElementValue);
    }
}

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

    if ([elementName isEqualToString:@"item"]) {
        [sharedSingleton.master addObject:aMaster];
        NSLog(@"Added %@ and %@ to the shared singleton", aMaster.title, aMaster.noType);  //Only having one at a time added... don't know why
        [aMaster release];

        aMaster = nil;

    } else if ([elementName isEqualToString:@"title"]) {
        [aMaster setValue:currentElementValue forKey:@"title"];
    } else if ([elementName isEqualToString:@"noType"]) {
        [aMaster setValue:currentElementValue forKey:@"noType"]; 
        //NSLog(@"%@ should load into the singleton", aMaster.noType);
    }
    NSLog(@"delimiter");
    NSLog(@"%@ should load into the singleton", aMaster.title);
    NSLog(@"%@ should load into the singleton", aMaster.noType);

    [currentElementValue release];
    currentElementValue = nil;

}

- (void) dealloc {
    [aMaster release];
    [currentElementValue release];
    [super dealloc];
}

@end

1 个解决方案

#1

Every time that didStartElement is called, you're setting aMaster to a new instance of the Master class. Based on the implementation of didEndElement, it looks like you should only be creating a new instance whenever a new item tag is found. This could be why each entry in the array has one value or the other, since a new instance is created for each value.

每次调用didStartElement时,您都会将aMaster设置为Master类的新实例。基于didEndElement的实现,看起来您应该只在找到新的项标签时创建新实例。这可能是数组中的每个条目都有一个值或另一个值的原因,因为为每个值创建了一个新实例。