在XMPPFrameWork中將XMPPMessage保存在CoreData中

Question

我正在開發一個聊天應用程序並使用xmppframework。現在需要將消息存儲在持久性存儲中。任何人都可以告訴我如何在iOS中存儲和檢索來自CoreData的消息。

Answer 1

是否使用https://github.com/robbiehanson/XMPPFramework 如果是，那麼它的默認實現核心數據你不得不做出細微的變化讓聊天消息...

Answer 2

由於您使用的github/robbiehanson/XMPPFramework，這是易初始化過程中獲取存儲兩個傳入和傳出消息：

//this code init your XMPPStream 
xmppStream = [[XMPPStream alloc]init]; 
[xmppStream addDelegate:self delegateQueue:dispatch_get_main_queue()]; 
xmppStream.autoStartTLS = YES; 

xmppReconnect = [[XMPPReconnect alloc]init]; 
[xmppReconnect activate:self.xmppStream]; 

xmppMessageArchivingCoreDataStorage = [XMPPMessageArchivingCoreDataStorage sharedInstance]; 
xmppMessageArchivingModule = [[XMPPMessageArchiving alloc]initWithMessageArchivingStorage:xmppMessageArchivingCoreDataStorage]; 
[xmppMessageArchivingModule setClientSideMessageArchivingOnly:YES]; 
[xmppMessageArchivingModule activate:xmppStream]; //By this line all your messages are stored in CoreData 
[xmppMessageArchivingModule addDelegate:self delegateQueue:dispatch_get_main_queue()]; 

調用已保存的消息，這裏是我的項目中的示例代碼：

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; 

NSManagedObjectContext *context = [self.xmppMessageArchivingCoreDataStorage mainThreadManagedObjectContext]; 
NSEntityDescription *messageEntity = [NSEntityDescription entityForName:@"XMPPMessageArchiving_Message_CoreDataObject" inManagedObjectContext:context]; 

fetchRequest.entity = messageEntity; 

NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"timestamp" ascending:NO]; 
fetchRequest.sortDescriptors = [NSArray arrayWithObject:sortDescriptor]; 
NSError *error = nil; 
NSArray *results = [context executeFetchRequest:fetchRequest error:&error]; 
//Now you get the NSArray with element type of "XMPPMessageArchiving_Message_CoreDataObject"