coredata01

// 添加一条通告
+ (ClassEvent *)eventWithId:(NSString *)eventId {
    ClassEvent *item = nil;
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(event_id == %@) and (user == %@)", eventId, [LoginManagerInstance() accountName]];
    item = [[CoreDataManager objectsForEntity:ClassEventEntityName matchingPredicate:predicate] lastObject];
    return item;
}
+ (ClassEvent *)eventInsertWithId:(NSString *)eventId {
    ClassEvent *item = [ClassDataManager eventWithId:eventId];
    if(!item) {
        item = (ClassEvent *)[CoreDataManager insertNewObjectForEntityForName:ClassEventEntityName];
        item.event_id = eventId;
        item.user = [LoginManagerInstance() accountName];
    }
    return item;
}
+ (ClassEvent *)eventWitdhDict:(NSDictionary *)dict {
    NSString *eventId = [ClassEvent idWithDict:dict];
    ClassEvent *item = [ClassDataManager eventInsertWithId:eventId];
    item.isGetByBookmarkList = [NSNumber numberWithBool:NO];
    [item updateWithDict:dict];
    return item;
}
+ (ClassEvent *)eventWitdhFavourDict:(NSDictionary *)dict {
    NSString *eventId = [ClassEvent idWithDict:dict];
    ClassEvent *item = [ClassDataManager eventWithId:eventId];
    // otherwise create new
    if (!item) {
        item = (ClassEvent *)[CoreDataManager insertNewObjectForEntityForName:ClassEventEntityName];
        item.isGetByBookmarkList = [NSNumber numberWithBool:YES];
    }
    item.user = [LoginManagerInstance() accountName];
    [item updateFavourWithDict:dict];
    return item;
}

DrPalmEBaby-815ea47eccac6e395414921b862c9ba118c8ba54

coredata01

原文：http://www.cnblogs.com/javastart/p/4672007.html