objective c singleton return nil

Question

I have singleton to use websocket connection, when _srWebSocket = nil, will returned new _srWebSocket, but when _srWebSocket connected, will returned nil

@interface SocketManager : NSObject



@property (nonatomic, weak) SRWebSocket *srWebSocket;



+ (SocketManager *) sharedInstance;



@end



@implementation SocketManager



@synthesize srWebSocket = _srWebSocket;



+ (SocketManager *) sharedInstance {

    static SocketManager *sharedInstance = nil;

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        sharedInstance = [[SocketManager alloc] init];

    });

    return sharedInstance;

}

- (id)init {

    if (self = [super init]) {

        NSLog(@"In SocketKeeperSingleton init");

    }

    return self;

}

- (SRWebSocket *) srWebSocket {

    if (!_srWebSocket || _srWebSocket.readyState == SR_CLOSED) {

        _srWebSocket = [[SRWebSocket alloc] initWithURL:[NSURL URLWithString:@"wss://...:8000"]];

        [_srWebSocket open];

    }

    return _srWebSocket;

}



@end

Call singleton 

srWebSocket = [SocketManager sharedInstance].srWebSocket;

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Answer 1

You are missing srWebSocket method call,

First way,

Declare one method in singleton.h file

-(void) doInitialSetupOnLaunch;

Add this method somewhere in your singleton.m file,

-(void) doInitialSetupOnLaunch {
   //Put your initialized code i mean you can call your method from here & define your properties here.

 _srWebSocket = [self srWebSocket];
}

Call it from somewhere,best way you can call from appDelegate.m

Now you are ready to access it by property,

Call singleton 
srWebSocket = [SocketManager sharedInstance].srWebSocket;

Or Second way

SRWebSocket * srWebSocket = [[SocketManager sharedInstance] srWebSocket];

objective c singleton return nil

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