Question

我正在解析这样的数据。

    parserSignIn = [[NSXMLParser alloc]initWithData:_responseData];
    [parserSignIn setDelegate:self];
    [parserSignIn parse];

之后

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


   tagName = [[NSString alloc] initWithString:elementName];

   if (parser == parserSignIn) {

    if ([tagName isEqualToString:@"MemberDetail"]) {

        NSLog(@"value is %@", elementName);

    NSManagedObjectContext *managedObjectContext = [database managedObjectContext];
    NSEntityDescription *entityDescription = [NSEntityDescription entityForName:@"MemberDetails" inManagedObjectContext:managedObjectContext];
    memberDetails = [[MemberDetails alloc] initWithEntity:entityDescription insertIntoManagedObjectContext:managedObjectContext];

       }

   }

}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    NSLog(@"FOUND %@", string);
    if ([tagName isEqualToString:@"InvalidLogin"]) {

    isSignIn = NO;
   }else{
     NSLog(@"NOT INVALID");
    isSignIn = YES;
    if ([tagName isEqualToString:@"MemberId"]) {

        memberDetails.memberId = string;

    }else if ([tagName isEqualToString:@"FirstName"]){
        memberDetails.firstname = string;


    }else if ([tagName isEqualToString:@"LastName"]){
        memberDetails.lastname = string;

    }
    else if ([tagName isEqualToString:@"Email"]){
        memberDetails.email = string;

    }

    NSLog(@"DATA is %@", memberDetails);
  }
 }

其中MemberDetails.h是

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>


@interface MemberDetails : NSManagedObject

@property (nonatomic, retain) NSString * memberId;
@property (nonatomic, retain) NSString * firstname;
@property (nonatomic, retain) NSString * lastname;
@property (nonatomic, retain) NSString * email;


MemberDetails.m is 

@dynamic memberId;
@dynamic firstname;
@dynamic lastname;
@dynamic email;

当我打印数据时，使用NSLog到MemberDetails对象

    0x9533360 <x-coredata:///MemberDetails/tD0F9345D-847F-4E6A-9C2F-22F4A23CB1B02> ; data: {
    email = nil;
    firstname = nil;
    lastname = nil;
    memberId = nil;
    })
    2013-09-15 16:10:33.540 ECP[24094:c07] FOUND 10758
2013-09-15 16:10:33.541 ECP[24094:c07] NOT INVALID
2013-09-15 16:10:33.541 ECP[24094:c07] DATA is <MemberDetails: 0x9533320> (entity: MemberDetails; id: 0x9533360 <x-coredata:///MemberDetails/tD0F9345D-847F-4E6A-9C2F-22F4A23CB1B02> ; data: {
    email = nil;
    firstname = nil;
    lastname = nil;
    memberId = 10758;
})
2013-09-15 16:10:33.543 ECP[24094:c07] FOUND 

2013-09-15 16:10:33.543 ECP[24094:c07] NOT INVALID
2013-09-15 16:10:33.544 ECP[24094:c07] DATA is <MemberDetails: 0x9533320> (entity: MemberDetails; id: 0x9533360 <x-coredata:///MemberDetails/tD0F9345D-847F-4E6A-9C2F-22F4A23CB1B02> ; data: {
    email = nil;
    firstname = nil;
    lastname = nil;
    memberId = "\n  ";
})
2013-09-15 16:10:33.544 ECP[24094:c07] FOUND Amit
2013-09-15 16:10:33.545 ECP[24094:c07] NOT INVALID
2013-09-15 16:10:33.545 ECP[24094:c07] DATA is <MemberDetails: 0x9533320> (entity: MemberDetails; id: 0x9533360 <x-coredata:///MemberDetails/tD0F9345D-847F-4E6A-9C2F-22F4A23CB1B02> ; data: {
    email = nil;
    firstname = Duaan;
    lastname = nil;
    memberId = "\n  ";
})
2013-09-15 16:10:33.545 ECP[24094:c07] FOUND 

2013-09-15 16:10:33.545 ECP[24094:c07] NOT INVALID
2013-09-15 16:10:33.546 ECP[24094:c07] DATA is <MemberDetails: 0x9533320> (entity: MemberDetails; id: 0x9533360 <x-coredata:///MemberDetails/tD0F9345D-847F-4E6A-9C2F-22F4A23CB1B02> ; data: {
    email = nil;
    firstname = "\n  ";
    lastname = nil;
    memberId = "\n  ";
})
2013-09-15 16:10:33.548 ECP[24094:c07] FOUND Metha
2013-09-15 16:10:33.548 ECP[24094:c07] NOT INVALID
2013-09-15 16:10:33.548 ECP[24094:c07] DATA is <MemberDetails: 0x9533320> (entity: MemberDetails; id: 0x9533360 <x-coredata:///MemberDetails/tD0F9345D-847F-4E6A-9C2F-22F4A23CB1B02> ; data: {
    email = nil;
    firstname = "\n  ";
    lastname = Rajput;
    memberId = "\n  ";
})
2013-09-15 16:10:33.548 ECP[24094:c07] FOUND 

2013-09-15 16:10:33.549 ECP[24094:c07] NOT INVALID
2013-09-15 16:10:33.549 ECP[24094:c07] DATA is <MemberDetails: 0x9533320> (entity: MemberDetails; id: 0x9533360 <x-coredata:///MemberDetails/tD0F9345D-847F-4E6A-9C2F-22F4A23CB1B02> ; data: {
    email = nil;
    firstname = "\n  ";
    lastname = "\n  ";
    memberId = "\n  ";
})
2013-09-15 16:10:33.549 ECP[24094:c07] FOUND amit@sevdotcom.ae
2013-09-15 16:10:33.550 ECP[24094:c07] NOT INVALID
2013-09-15 16:10:33.550 ECP[24094:c07] DATA is <MemberDetails: 0x9533320> (entity: MemberDetails; id: 0x9533360 <x-coredata:///MemberDetails/tD0F9345D-847F-4E6A-9C2F-22F4A23CB1B02> ; data: {
    email = "duan@abccompany.ae";
    firstname = "\n  ";
    lastname = "\n  ";
    memberId = "\n  ";
})
2013-09-15 16:10:33.556 ECP[24094:c07] FOUND 
2013-09-15 16:10:33.557 ECP[24094:c07] NOT INVALID
2013-09-15 16:10:33.557 ECP[24094:c07] DATA is <MemberDetails: 0x9533320> (entity: MemberDetails; id: 0x9533360 <x-coredata:///MemberDetails/tD0F9345D-847F-4E6A-9C2F-22F4A23CB1B02> ; data: {
    email = "\n";
    firstname = "\n  ";
    lastname = "\n  ";
    memberId = "\n  ";
})

为什么它在保存数据和打印对象时为零？ 什么是\ n被保存，它根本不是xml的一部分？

感谢

Answer 1

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

此方法可能无法获得整个值 - 可以使用内容的位数多次调用它。因此，您应该在班级中使用NSMutableString作为属性，并在每次调用时将string附加到其中。然后在parser:didEndElement:namespaceURI:qualifiedName:中使用它（然后清空字符串）。

同样，不要保存tagName并尝试使用parser:foundCharacters:，使用传入的元素名称和您的字符在parser:didEndElement:namespaceURI:qualifiedName:中完成大部分工作找到并添加到你的可变字符串中。

您的日志显示您始终拥有相同的实例<MemberDetails: 0x9533320>，并且您添加到其中的信息不断被覆盖或仅仅是垃圾。我怀疑这与您正在使用的标签有关，但您没有显示示例XML，因此很难判断。很可能还有一个事实，那就是你的大部分处理都在parser:foundCharacters:方法中。

如何使用NSManagedObject子类从NSXMLParser保存数据并将其保存在CoreData中？

1 个答案: