[MonoTouch] Objective-C protocol binding method not invoked

[Xy]

Hi Rolf,

I'm not sure what RespondsToSelector is. Could you explain how to use it?


Rolf Bjarne Kvinge wrote
> 
> Hi,
> 
> So after having a better look at your code I can't say what's going on,
> but
> maybe you can override RespondsToSelector for that type and see what's
> being answered (and asked)?
> 
> Rolf
> 
> On Wed, Nov 30, 2011 at 4:41 AM, Xy <Xy@> wrote:
> 
>> Hi Rolf,
>>
>> We are using the mentioned doc, as well as the bindings reference guide
>> to
>> create our bindings. Perhaps the original context of this thread was
>> lost,
>> so I'm posting the first message again:
>> ---------------------
>> I bind a protocol that specifies the type for a delegate:
>>        [BaseType (typeof (NSObject))]
>>        [Model]
>>        interface SCTableViewModelDataSource
>>        {
>>                ........
>>
>>                [Export
>> ("tableViewModel:newItemForArrayOfItemsSectionAtIndex:")]
>>                 NSObject
>> NewItemForArrayOfItemsSectionAtIndex(SCTableViewModel tableViewModel, int
>> index);
>>
>>        } // SCTableViewModelDataSource
>>
>> And a class that uses the delegate, as well a few subclasses:
>>
>>         [BaseType (typeof (NSObject))]
>>        interface SCTableViewModel
>>         {
>>                 ........
>>
>>                ///** The object that acts as the data source of
>> 'SCTableViewModel'. The object must adopt the SCTableViewModelDataSource
>> protocol. */
>>                //@property (nonatomic, assign) id dataSource;
>>                [Export ("dataSource", ArgumentSemantic.Assign),
>> NullAllowed]
>>                NSObject WeakDataSource { get; set; }
>>
>>                [Wrap ("WeakDataSource"), NullAllowed]
>>                 SCTableViewModelDataSource DataSource { get; set; }
>>        } // SCTableViewModel
>>
>>        [BaseType (typeof (SCTableViewModel)), DisableDefaultCtor]
>>        interface SCArrayOfItemsModel
>>        {
>>                ........
>>        } // SCArrayOfItemsModel
>>
>>        [BaseType (typeof (SCArrayOfItemsModel))]
>>        interface SCArrayOfObjectsModel
>>        {
>>                ........
>>        } // SCArrayOfObjectsModel
>>
>> In my view controller, I create an inner class that inherit the protocol:
>>                class TableViewModelDataSource :
>> SCTableViewModelDataSource
>>                {
>>                        RootViewController controller;
>>
>>                        public TableViewModelDataSource
>> (RootViewController
>> controller)
>>                        {
>>                                this.controller = controller;
>>                        }
>>
>>                        public override NSObject
>> NewItemForArrayOfItemsSectionAtIndex (SCTableViewModel tableViewModel,
>> int
>> index)
>>                        {
>>                                Console.WriteLine("Creating new thing");
>>                                return null;
>>                        }
>>                } // TableViewModelDataSource
>>
>>
>> And I assign a new TableViewModelDataSource object as the DataSource of a
>> SCArrayOfObjectsModel obj:
>>
>>                        mTableModel = new SCArrayOfObjectsModel();
>>                        mTableModel.Init();
>>                        mTableModel.DataSource = new
>> TableViewModelDataSource(this); // this is the vew controller
>>
>> I have tested this same code in an Obj-C iOS project, and the delegate
>> method tableViewModel:newItemForArrayOfItemsSectionAtIndex: gets called
>> when
>> expected. However, I wasn't able to get the C# equivalent invoked. There
>> is
>> no console output, and a breakpoint in the method does not stop
>> execution.
>> Am I somehow not binding the protocol correctly, or am I missing a step
>> in
>> binding?
>> ---------------------
>>
>>
>> Rolf Bjarne Kvinge wrote
>> >
>> > Hi,
>> >
>> > Have you read this:
>> > http://docs.xamarin.com/ios/advanced_topics/binding_objective-c_types?
>> If
>> > you just want to provide bindings, having a tool do most of the work is
>> > usually best :)
>> >
>> > Rolf
>> >
>> > On Tue, Nov 29, 2011 at 12:59 AM, Xy <Xy@> wrote:
>> >
>> >> Hi Rolf,
>> >>
>> >> Thanks for the advice, but we're actually not trying to implement this
>> >> Obj-C
>> >> class in C#, just provide C# bindings to its APIs. I looked at more
>> code
>> >> examples, and looks it may not necessary to declare these protocols in
>> C#
>> >> bindings. So we're going back to the original question: what might
>> cause
>> >> a
>> >> delegate method that gets called in an iOS program to not get called
>> in
>> a
>> >> MT
>> >> program with same/similar code logic?
>> >>
>> >> --
>> >> View this message in context:
>> >>
>> http://monotouch.2284126.n4.nabble.com/Objective-C-protocol-binding-method-not-invoked-tp4105828p4117403.html
>> >> Sent from the MonoTouch mailing list archive at Nabble.com.
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>> >
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>> >
>>
>>
>> --
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>> http://monotouch.2284126.n4.nabble.com/Objective-C-protocol-binding-method-not-invoked-tp4105828p4121794.html
>> Sent from the MonoTouch mailing list archive at Nabble.com.
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