The implementation looks like. So at that point there is literally 0 logic, so I had this thought that probably only the logs were not displayed in the terminal, but the methods were executed, so I blindly developed those methods with the hope that if works it works if not it should crash and give me the clue that those are actually executed. But again, it didn't work but it didn't crash neither, so again is like those methods somehow are not executed and I see quite difficult that the official Google's WebRTC SDK is failing, as final note if I don't pass any delegate to the peerConnection factory, I do receive a peerConnection returned from that method, I can create SDP and some other stuff, but of course I couldn't finish my plugin because I need those delegates in order to receive the ICE Candidate and State Changes, but If I do pass the delegate the SDK hangs and nothing happens and when I say hangs is because the app is still up and running, is just the flow is stopped, but it does not crash the app.
I apologize the long text, I'm just trying to give enough info to avoid creating the false sense that might be some custom logic in between making it fail Again if you guys think I should open a new ticket I'm up to whatever you guys recommend. Will update with the results. So as a context I started by the one that made the more sense because of the diagnosis, it did sound like a lost reference so I started with that one and the sdk started working again, I still don't see any log but I'm pretty sure I still need to negotiate a connection first in order to receive those what I was doing before having the delegate issues , but once setting a local reference this.
Both test 2 and 3, were tested after the sdk started working again without presenting a difference in terms of making the sdk to fail or not, it will just keep working as long as number 1 is covered.
Skip to content. Star New issue. Jump to bottom. Labels docs needed. Linked pull requests. Copy link. Otherwise, I do believe this issue is closed!
A protocol is an Objective-C language feature that provides a list of method declarations. It serves a similar purpose to an interface in C , the main difference being that a protocol can have optional methods. Optional methods are not called if the class that adopts a protocol does not implement them.
Also, a single class in Objective-C can implement multiple protocols, just as a C class can implement multiple interfaces. Apple uses protocols throughout iOS to define contracts for classes to adopt, while abstracting away the implementing class from the caller, thus operating just like a C interface.
Protocols are used both in non-delegate scenarios such as with the MKAnnotation example shown next , and with delegates as presented later in this document, in the Delegates section.
MKAnnotation is a protocol that allows any object that adopts it to provide information about an annotation that can be added to a map. For example, an object implementing MKAnnotation provides the location of the annotation and the title associated with it. In this way, the MKAnnotation protocol is used to provide pertinent data that accompanies an annotation. The actual view for the annotation itself is built from the data in the object that adopts the MKAnnotation protocol. For example, the text for the callout that appears when the user taps on the annotation as shown in the screenshot below comes from the Title property in the class that implements the protocol:.
As described in the next section, Protocols Deep Dive , Xamarin. The protocol requires a getter and setter to be implemented for the coordinate; however, a title and subtitle are optional. Therefore, in the MKAnnotation class, the Coordinate property is abstract , requiring it to be implemented and the Title and Subtitle properties are marked virtual , making them optional, as shown below:.
Any class can provide annotation data by simply deriving from MKAnnotation , as long as at least the Coordinate property is implemented. To add an annotation to a map, simply call the AddAnnotation method of an MKMapView instance, as shown in the following code:.
The map variable here is an instance of an MKMapView , which is the class that represents the map itself. The MKAnnotation protocol provides a known set of capabilities across any objects that implement it, without the consumer the map in this case needing to know about implementation details.
This streamlines adding a variety of possible annotations to a map. Therefore, adopting a protocol in Objective-C is accomplished in Xamarin. These methods will be exposed as abstract methods in the class.
Optional methods from the protocol will be bound to virtual methods of the C class. Note that the class is abstract. This affects the design of C code that uses protocols, and typically leads to nested classes. More about this issue is covered later in this document, in the Delegates section. Selector is the Objective-C term for method name.
To enforce the method as required, Xamarin. This method is optional in the protocol, so Xamarin. However, if you ever need to bind a protocol from Objective-C manually, you can do so by decorating a class with the ExportAttribute. This is the same method used by Xamarin.
For more information about how to bind Objective-C types in Xamarin. The object doing the work is the delegate of the first object. An object tells its delegate to do work by sending it messages after certain things happen. One way that we can make the above code a bit more predictable is to refactor the decision-making part of our delegate protocol to use a closure instead.
That way, our API user will be required to specify the logic used to decide which files that will be imported up-front, removing the ambiguity in our file importer's logic:.
With the above change in place, we can now go ahead and remove the shouldImportFile method from our delegate protocol, leaving us with only methods related to changes in state:. The main advantage of the above is that it now becomes much harder to use our FileImporter class "the wrong way" , since it's now completely valid to use it without even assigning a delegate which in this case might be useful in case some files should be imported in the background and we're not really interested in the outcome of the operation.
Let's say we wanted to continue converting the rest of our delegate methods into closures as well. One way of doing so would be to simply continue adding closures as either initializer arguments or mutable properties. However, when doing so, our API can start becoming a bit messy - and it can be hard to distinguish between configuration options and other types of properties. One way of solving that dilemma is to use a dedicated configuration type.
By doing so we can achieve the same nice grouping of events, just like we had with our original delegate protocol, while still enabling a lot of freedom when implementing the various events.
We'll use a struct for our configuration type and add properties for each event, like this:. We can now update FileImporter to take a single parameter - its configuration - when being initialized, and easily access each closure by saving the configuration in a property:.
Using the above approach to delegation also comes with a nice bonus benefit - it becomes super easy to define convenience APIs for various common FileImporter configurations. For example, we can add a convenience initializer on FileImportConfiguration that only takes a predicate - making it simple to create a "fire and forget" type importer:.
As a quick side note; by defining struct convenience initializers in extensions instead of on the type itself, we can still keep the default compiler-generated initializer. We can even create static convenience APIs for common configurations that doesn't require any parameters, for example a variant that simply imports all files:.
0コメント