Saya mencoba meneruskan objek dari delegasi aplikasi saya ke penerima notifikasi di kelas lain.

Saya ingin lulus bilangan bulat messageTotal. Sekarang saya punya:

Dalam Penerima:

- (void) receiveTestNotification:(NSNotification *) notification
{
    if ([[notification name] isEqualToString:@"TestNotification"])
        NSLog (@"Successfully received the test notification!");
}

- (void)viewDidLoad {
    [super viewDidLoad];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(dismissSheet) name:UIApplicationWillResignActiveNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveTestNotification:) name:@"eRXReceived" object:nil];

Di kelas yang melakukan pemberitahuan:

[UIApplication sharedApplication].applicationIconBadgeNumber = messageTotal;
[[NSNotificationCenter defaultCenter] postNotificationName:@"eRXReceived" object:self];

Tapi saya ingin meneruskan objek messageTotalke kelas lain.

Anda harus menggunakan varian "userInfo" dan meneruskan objek NSDictionary yang berisi integer messageTotal:

NSDictionary* userInfo = @{@"total": @(messageTotal)};

NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
[nc postNotificationName:@"eRXReceived" object:self userInfo:userInfo];

Di sisi penerima Anda dapat mengakses kamus userInfo sebagai berikut:

-(void) receiveTestNotification:(NSNotification*)notification
{
    if ([notification.name isEqualToString:@"TestNotification"])
    {
        NSDictionary* userInfo = notification.userInfo;
        NSNumber* total = (NSNumber*)userInfo[@"total"];
        NSLog (@"Successfully received test notification! %i", total.intValue);
    }
}

Membangun pada solusi asalkan saya pikir mungkin membantu untuk menunjukkan contoh melewati objek data kustom Anda sendiri (yang saya rujuk di sini sebagai 'pesan' sesuai pertanyaan).

Kelas A (pengirim):

YourDataObject *message = [[YourDataObject alloc] init];
// set your message properties
NSDictionary *dict = [NSDictionary dictionaryWithObject:message forKey:@"message"];
[[NSNotificationCenter defaultCenter] postNotificationName:@"NotificationMessageEvent" object:nil userInfo:dict];

Kelas B (penerima):

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter]
     addObserver:self selector:@selector(triggerAction:) name:@"NotificationMessageEvent" object:nil];
}

#pragma mark - Notification
-(void) triggerAction:(NSNotification *) notification
{
    NSDictionary *dict = notification.userInfo;
    YourDataObject *message = [dict valueForKey:@"message"];
    if (message != nil) {
        // do stuff here with your message data
    }
}

Versi Swift 2

Seperti yang ditunjukkan oleh @Johan Karlsson ... Saya salah melakukannya. Inilah cara yang tepat untuk mengirim dan menerima informasi dengan NSNotificationCenter.

Pertama, kita melihat inisialisasi untuk postNotificationName:

init(name name: String,
   object object: AnyObject?,
 userInfo userInfo: [NSObject : AnyObject]?)

sumber

Kami akan meneruskan informasi kami menggunakan userInfoparam. The [NSObject : AnyObject]jenis adalah terus-alih dari Objective-C . Jadi, di tanah Swift, semua yang perlu kita lakukan adalah memasukkan kamus Swift yang memiliki kunci yang berasal dari NSObjectdan nilai-nilai yang dapat AnyObject.

Dengan pengetahuan itu kami membuat kamus yang akan kami sampaikan ke objectparameter:

 var userInfo = [String:String]()
 userInfo["UserName"] = "Dan"
 userInfo["Something"] = "Could be any object including a custom Type."

Lalu kami meneruskan kamus ke parameter objek kami.

Pengirim

NSNotificationCenter.defaultCenter()
    .postNotificationName("myCustomId", object: nil, userInfo: userInfo)

Kelas Penerima

Pertama, kita perlu memastikan kelas kita memperhatikan notifikasi

override func viewDidLoad() {
    super.viewDidLoad()

    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("btnClicked:"), name: "myCustomId", object: nil)   
}
    

Maka kita dapat menerima kamus kami:

func btnClicked(notification: NSNotification) {
   let userInfo : [String:String!] = notification.userInfo as! [String:String!]
   let name = userInfo["UserName"]
   print(name)
}

Cepat 5

func post() {
    NotificationCenter.default.post(name: Notification.Name("SomeNotificationName"), 
        object: nil, 
        userInfo:["key0": "value", "key1": 1234])
}

func addObservers() {
    NotificationCenter.default.addObserver(self, 
        selector: #selector(someMethod), 
        name: Notification.Name("SomeNotificationName"), 
        object: nil)
}

@objc func someMethod(_ notification: Notification) {
    let info0 = notification.userInfo?["key0"]
    let info1 = notification.userInfo?["key1"]
}

Bonus (yang harus Anda lakukan!):

Ganti Notification.Name("SomeNotificationName")dengan .someNotificationName:

extension Notification.Name {
    static let someNotificationName = Notification.Name("SomeNotificationName")
}

Ganti "key0"dan "key1"dengan Notification.Key.key0dan Notification.Key.key1:

extension Notification {
  enum Key: String {
    case key0
    case key1
  }
}

Mengapa saya harus melakukan ini? Untuk menghindari kesalahan pengetikan yang mahal, nikmati penggantian nama, nikmati temukan penggunaan dll ...

Swift 5.1 Obyek / Jenis Kustom

// MARK: - NotificationName
// Extending notification name to avoid string errors.
extension Notification.Name {
    static let yourNotificationName = Notification.Name("yourNotificationName")
}


// MARK: - CustomObject
class YourCustomObject {
    // Any stuffs you would like to set in your custom object as always.
    init() {}
}

// MARK: - Notification Sender Class
class NotificatioSenderClass {

     // Just grab the content of this function and put it to your function responsible for triggering a notification.
    func postNotification(){
        // Note: - This is the important part pass your object instance as object parameter.
        let yourObjectInstance = YourCustomObject()
        NotificationCenter.default.post(name: .yourNotificationName, object: yourObjectInstance)
    }
}

// MARK: -Notification  Receiver class
class NotificationReceiverClass: UIViewController {
    // MARK: - ViewController Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()
        // Register your notification listener
        NotificationCenter.default.addObserver(self, selector: #selector(didReceiveNotificationWithCustomObject), name: .yourNotificationName, object: nil)
    }

    // MARK: - Helpers
    @objc private func didReceiveNotificationWithCustomObject(notification: Notification){
        // Important: - Grab your custom object here by casting the notification object.
        guard let yourPassedObject = notification.object as? YourCustomObject else {return}
        // That's it now you can use your custom object
        //
        //

    }
      // MARK: - Deinit
  deinit {
      // Save your memory by releasing notification listener
      NotificationCenter.default.removeObserver(self, name: .yourNotificationName, object: nil)
    }




}