How to share NSOutputStream from appdelegate?

Question

I set socket connection in appdelegate from app starting up connecting to server. in appdelegate.h

@interface AppDelegate : NSObject <NSStreamDelegate,UIApplicationDelegate> {
    UIWindow *window;
    UITabBarController *tabBarController;
    NSInputStream *inputStream;
 NSOutputStream *outputStream;
}

then in appdelegate.m set connecting to server:

 CFReadStreamRef readStream;
 CFWriteStreamRef writeStream;
 CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"111.111.111.11", 111, &readStream, &writeStream);

 inputStream = (NSInputStream *)readStream;
 outputStream = (NSOutputStream *)writeStream;
 [inputStream setDelegate:self];
 [outputStream setDelegate:self];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
 [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
 [inputStream open];
 [outputStream open];

It runs well when app startup. communicate well also.

and then I have a tab controller. Every one of tabs needs exchanged datas to server by this socket. I dont want to creat different socket for every tab.

How do I use the same outputstream/inputstream?

I try this in firstviewcontroall.m but failed:

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSData *data = [[NSData alloc] initWithData:[@"hello this is firstview" dataUsingEncoding:NSUTF8StringEncoding]];
 [outputStream write:[data bytes] maxLength:[data length]];
}

There is no datas sending to server. I dont want to create a socket on every viewcontroller to server. that wastes too much resources. My question is how do I send/recieve datas by one socket connection?

Answer 1

Use the streams by below way:

AppDelegate *appDel = (AppDelegate *)[UIApplication sharedApplication].delegate;
[appDel.outputStream write:[data bytes] maxLength:[data length]];
[appDel.inputStream <CALL_YOUR_METHOD>];