CODEWITHSUNDEEP
iosswiftnsnotificationcenterunrecognized-selectornsnotification
IcuScc
IcuScc

Reputation: 72

Swift Nsnotificationcenter post notification error

I have a problem with post notification function.

In the FirstViewController in viewDidLoad I have this sentence:

NSNotificationCenter.defaultCenter().addObserver(self, selector: "ponresultado", name: "resultadobusqueda", object: nil)

After that I have the function:

func ponresultado(notification:NSNotification)
{
    var oDato : oDatoSel = notification.object as oDatoSel
}

In second view controller of type TableViewController in didDeselectRowAtIndexPath method I have this code:

var oDato : oDatoSel = oDatoSel()
oDato.id = "1"
oDato.nombre = "test"
NSNotificationCenter.defaultCenter().postNotificationName("resultadobusqueda", object: oDato)

I receive this error:

[App.FirstViewController ponresultado]: unrecognized selector sent to instance 0x797d2310

If in my ponresultado function in FirstViewController, I quit notification:NSNotification parameter like this:

func ponresultado()
{
    var oDato : oDatoSel = notification.object as oDatoSel
}

I don't have the error. Why?

Upvotes: 2

Views: 6187

Answers (2)

delannoyk
delannoyk

Reputation: 1224

If your method takes a NSNotification as a parameter, you should add the ":" to your selector when registering. So your line :

NSNotificationCenter.defaultCenter().addObserver(self, selector: "ponresultado", name: "resultadobusqueda", object: nil)

Becomes

NSNotificationCenter.defaultCenter().addObserver(self, selector: "ponresultado:", name: "resultadobusqueda", object: nil)

Upvotes: 0

Shai
Shai

Reputation: 25619

You need to add a : after the selector's name:

NSNotificationCenter.defaultCenter().addObserver(self, selector: "ponresultado:", name: "resultadobusqueda", object: nil)

As your method is declared such as it accepts a NSNotification object:

func ponresultado(notification:NSNotification)
{
    var oDato : oDatoSel = notification.object as oDatoSel
}

Upvotes: 7

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