Delegate not working in singleton [closed]

问题

To have a network connection over my multiple view's, I created a Singleton network controller to handle the data between the server and the client. Unfortunately, it is not working because the delegate method is not being called from my singleton to the other view.. Below my code:

** The singleton is the SocketIOConnection.h and .m

//
//  SocketIOConnection.h

#import <Foundation/Foundation.h>
#import "SocketIO.h"
#import "SocketIOPacket.h"

@protocol SocketIOConnectionDelegate <NSObject>
@required
- (void) receivedPacket:(id)packet;
@end

@interface SocketIOConnection : NSObject <SocketIODelegate> {

    SocketIO *IO;
    id <SocketIOConnectionDelegate> delegate;

}

@property (nonatomic, retain) IBOutlet SocketIO *IO;
@property (retain) id <SocketIOConnectionDelegate> delegate;


+ (SocketIOConnection *)sharedSingleton;

@end



//
//  SocketIOConnection.m

#import "SocketIOConnection.h"

@implementation SocketIOConnection

@synthesize IO, delegate;

static SocketIOConnection *shared = NULL;

-(id)init {
    if (self = [super init]) {
        IO = [[SocketIO alloc] initWithDelegate:self];
        [IO connectToHost:@"domain.com" onPort:443];
    }
    return self;
}

+ (SocketIOConnection *)sharedSingleton
{
    @synchronized(shared)
    {
        if ( !shared || shared == NULL )
        {
            // allocate the shared instance, because it hasn't been done yet
            shared = [[SocketIOConnection alloc] init];
        }

        return shared;
    }
}

-(void)socketIO:(SocketIO *)socket didReceiveEvent:(SocketIOPacket *)packet {
    NSLog(@"Delegating received packet..");
    [delegate receivedPacket:packet.dataAsJSON];
}

@end

So this is the code of my singleton, below i will post the code of my viewcontroller.h and .m

//
//  ViewController.h

#import <UIKit/UIKit.h>
#import "MBProgressHUD.h"
#import "SocketIOConnection.h"

@interface ViewController : UIViewController <MBProgressHUDDelegate, SocketIOConnectionDelegate>
{
    MBProgressHUD   *HUD;
}

@property (nonatomic, retain) SocketIOConnection *IOConnection;

@end



//
//  ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController {
    NSDictionary *operatorData;
}

@synthesize SESSION, IOConnection;

#pragma mark - view Did Load, View Will Appear & didReceiveMemoryWarning

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

}

-(void)viewWillAppear:(BOOL)animated {

    IOConnection    = [SocketIOConnection sharedSingleton];

    // fire auth function to verify the operator and sign him in.
    NSMutableDictionary *tokenAndLicense = [[NSMutableDictionary alloc] init];
    [tokenAndLicense setValue:[operatorData objectForKey:@"token"] forKey:@"__ca.token"];
    [tokenAndLicense setValue:[operatorData objectForKey:@"license"] forKey:@"__ca.license"];
    [IOConnection.IO sendEvent:@"auth" withData:tokenAndLicense];

}

-(void)receivedPacket:(id)packet { <<<< void that should be fired because of the delegate
    NSLog(@"Receive ieks..");
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Why is my delegate method not getting called?

回答1:

It looks like you have forgotten to set the delegate in your code. You should probalby do this right after you call the singleton in the view controller's ViewWillAppear.

-(void)viewWillAppear:(BOOL)animated {

    IOConnection    = [SocketIOConnection sharedSingleton];

    IOConnection.delegate = self;

    // fire auth function to verify the operator and sign him in.
    NSMutableDictionary *tokenAndLicense = [[NSMutableDictionary alloc] init];
    [tokenAndLicense setValue:[operatorData objectForKey:@"token"] forKey:@"__ca.token"];
    [tokenAndLicense setValue:[operatorData objectForKey:@"license"] forKey:@"__ca.license"];
    [IOConnection.IO sendEvent:@"auth" withData:tokenAndLicense];

}

来源：https://stackoverflow.com/questions/15994066/delegate-not-working-in-singleton

标签

ios

objective-c

xcode

delegates

singleton