我也是 iOS 开发和 CoreData 的新手。我正在调用 .Net WCF 服务以在我的应用程序的 UITableViewcontroller 中显示数据。我将这些数据保存在 CoreData 中。当我在服务器上添加新记录时，我希望它显示在 UITableViewController 中并保存在 CoreData 中。但这不会发生。我必须在模拟器上执行“重置内容和设置”，然后运行应用程序再次。当我这样做时，应用程序显示来自服务的最新记录。它还将新记录保存在 CoreData 中。我使用 SUDZC 与 wcf 服务交互。调用服务的代码，在 UITableViewController 中显示数据并将其保存到CoreData 看起来像这样：
- (void)viewDidLoad
{
[super viewDidLoad];
self.detailViewController = (DetailViewController *)[[self.splitViewController.viewControllers lastObject] topViewController];
[my_table setDataSource:self];
[my_table setDelegate:self];
EDViPadDocSyncService *service = [[EDViPadDocSyncService alloc]init];
[service getAllCategories:self action:@selector(handleGetAllCategories:)];
}
-(void)handleGetAllCategories:(id)value
{
if([value isKindOfClass:[NSError class]])
{
NSLog(@"This is an error %@",value);
return;
}
if([value isKindOfClass:[SoapFault class]])
{
NSLog(@"this is a soap fault %@",value);
return;
}
NSMutableArray *result = (NSMutableArray*)value;
self.myData = [[NSMutableArray array] init];//array for storing 'category name'
self.catId = [[NSMutableArray array]init];//array for storing 'category ID'
self.myData=[self getCategories];
/*store data in Core Data - START*/
NSMutableArray *coreDataCategoryarray = [[NSMutableArray alloc]init];
NSManagedObjectContext *context = [self managedObjectContext];
Categories *newCategory;//this is the CoreData 'Category' object
for(int j=0;j<[result count];j++)
{
EDVCategory *edvCat = [[EDVCategory alloc]init];//this is the SUDZC 'Category' object
edvCat = [result objectAtIndex:j];
if ([self.catId count]>0) {
for (int i=0; i<[self.catId count]; i++) {
if ([edvCat categoryId] == [[self.catId objectAtIndex:i] integerValue]) {
checkFlag=TRUE;
}
}
}
if (checkFlag == FALSE) {
newCategory = [NSEntityDescription insertNewObjectForEntityForName:@"Categories" inManagedObjectContext:context];
[newCategory setCategoryId:[NSNumber numberWithInt:[edvCat categoryId]]];
[newCategory setCategoryName:edvCat.categoryName];
[newCategory setDocCount:[NSNumber numberWithInt:[edvCat docCount]]];
[newCategory setCategoryType:[NSNumber numberWithShort:[edvCat categoryType]]];
[newCategory setSubCategoryId:[NSNumber numberWithInt:[edvCat subCategoryId]]];
[coreDataCategoryarray addObject:newCategory];
}
}
/*store data in Core Data - END*/
NSError *error = nil;
if (![context save:&error])
{
[coreDataCategoryarray release];
}
else
{
//return [coreDataCategoryarray autorelease];
[coreDataCategoryarray autorelease];
}
self.myData=[self getCategories];
[my_table reloadData];
}
-(NSMutableArray *)getCategories
{
NSFetchRequest *request = [[[NSFetchRequest alloc] init]autorelease];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Categories" inManagedObjectContext:__managedObjectContext];
NSSortDescriptor *sortByName = [[[NSSortDescriptor alloc] initWithKey:@"categoryId" ascending:YES] autorelease];
[request setSortDescriptors:[NSArray arrayWithObject:sortByName]];
[request setEntity:entity];
entity = nil;
NSError *error = nil;
NSMutableArray *fetchResults = [[__managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
[request setReturnsObjectsAsFaults:NO];
NSManagedObject *aTabrss;
NSMutableArray *arForGetCategory=[[NSMutableArray alloc]init];
for (aTabrss in fetchResults){
[arForGetCategory addObject:[aTabrss valueForKey:@"categoryName"]];
[self.catId addObject:[aTabrss valueForKey:@"categoryId"]];
}
return (arForGetCategory);
}
我应该在我的代码中进行哪些更改，以便它反映来自服务的最新数据并同时将其保存到 CoreData(sqlite)？