CODEWITHSUNDEEP
bindingxamarin.ios
Rogier
Rogier

Reputation: 1240

Generated binding events crash MonoTouch

I have a binding for Bluetooth BLE device with the following binding:

[BaseType (typeof (CBPeripheralDelegate), Delegates=new string [] {"WeakDelegate"}, 
 Events=new Type [] { typeof (BrspDelegate) })]
interface Brsp
{
    //@property (nonatomic, weak) id <BrspDelegate> delegate;
    [Export ("delegate")]
    [NullAllowed]
    BrspDelegate Delegate { get; set; }

    [Wrap ("WeakDelegate")]
    [NullAllowed]
    NSObject WeakDelegate { get; set; }

    ...other stuff

}

And the following delegate:

    [BaseType(typeof(NSObject))]
    [Model]
    interface BrspDelegate 
    {
         [Abstract]
         [Export("brsp:OpenStatusChanged:"), EventArgs("OpenStatus")]

         ...other stuff
    }

When I hook up a generated event handler for the openstatuschanged, it instantly crashes the app and I get no feedback whatsoever what could be wrong. I'm still a newbie to binding, so...

I have the feeling somehow I made mistake with "Events = ..." part, any ideas?

Thanks,

Rogier

Upvotes: 2

Views: 208

Answers (1)

poupou
poupou

Reputation: 43553

Hard to say without more details (e.g. symbolicated crash log) but part of your bindings are inverted (and that could cause endless recursion that will crash your app).

  • your Delegate method should have the [Wrap] attribute (on WeakDelegate); and
  • your WeakDelegate method should be the one with the [Export] attribute on the delegate selector.

E.g.

    [Wrap ("WeakDelegate")]
    StronglyTypedDelegate Delegate { get; set; }

    [Export ("delegate")][NullAllowed]
    NSObject WeakDelegate { get; set; }

Upvotes: 2

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