iOS Question [Solved] How to implement a given SDK protocol callback in Obj-C?

JordiCP · Apr 12, 2018

I need to implement a callback function defined in a @protocol declaration of an SDK that I am using.

I managed to integrate the SDK and initialize it using inline Objective-C (I receive logs stating that it is 'working'), but need a clue (better two) of how to implement this callback in Objective C

According to their DOCUMENTATION, it says

"You may also customize actions using MOCAProximityActionsDelegate:"

B4X:

@protocol
@optional

// ... some other protocol functions that won't be used


// This is the one I want to use.
/*
 * Called when the app should execute a custom action.
 * @param customAttribute - user provided custom attribute
 * @return YES if the alert was shown to the user, NO otherwise.
 */
-(BOOL)action:(MOCAAction*)sender performCustomAction:(NSString*)customAttribute withSituation:(MOCAFireSituation)situation;

@end

How could I declare this function in inline Objective C so that I can process this call?

Thanks in advance!

JanPRO · Apr 12, 2018

Hi,

when you initialize the object you just need to set the delegate property:

B4X:

Object.eventsDelegate = self;

Now add the the method of the protocol to your Objc code:

B4X:

-(BOOL)action:(MOCAAction*)sender performCustomAction:(NSString*)customAttribute withSituation:(MOCAFireSituation)situation{

}

At some point, you probably want to call a B4i sub back, then use: https://www.b4x.com/android/forum/threads/call-b4i-sub-from-inline-objc.52528/#post-329006

Jan

JordiCP · Apr 13, 2018

Thanks for the answer Jan, and sorry for the late reply!

This seems the way to go, but there are some details that I can't sort, possibly due to my inexperience

I'll try to summarize the best I can:

The main Class is MOCA. From it we can get MOCAProximityService, which is the one that has the delegates. There is an eventDelegate and an actionDelegate.
The same in Android is really simple (Just declaring that the app class implements de callback and declaring it with @override) but not in IOS
My current code is

B4X:

- (void)MocaInit {
 
    // Initialize MOCA SDK.
    BOOL mocaReady = [MOCA initializeSDK];
    if (!mocaReady) {
        NSLog(@"MOCA SDK initialization failed.");
    }else{
        NSLog(@"MOCA SDK initialization OK!!!");
        MOCAProximityService * theService = [MOCA proximityService];
        [theService actionsDelegate] = self;     // Compiler throws: "error: expression is not assignable" 
        //[theService eventsDelegate] = self;   //<-- we don't use this one, since the desired callback is defined in the MOCAProximityActionsDelegate and not the MOCAProximityEventsDelegate
    }       
}

What should I change to make in work? and also how to declare the callback function: Inside an @implementation block? Should I declare also @interface and/or that my app adheres to the defined protocol (from what I have read)... too many doubts

Just in case I attach the 3 header files (MOCAlib.h, MOCAProximityService.h and MOCAProximityDelegate.h) where . I'll give my eternal gratitude, a virtual beer or a donation (whatever you prefer) if I can get it solved.

JordiCP · Apr 13, 2018

Just for others who will face a similar case while learning with trial and error, now it is solved.

Just had to change the line

B4X:

// [theService actionsDelegate] = self;  // Previous error line
[theService actionsDelegate : self];      // Correct one

Since according to the definition in the header file, in this case, it is defined as a function and not a property

B4X:

/**
 * Protocol to handle proximity experience actions.
 */
-(void)actionsDelegate: (id<MOCAProximityActionsDelegate>) delegate;

JanPRO · Apr 13, 2018

JordiCP said:
now it is solved

Is your whole problem solved now?

Jan

JordiCP · Apr 15, 2018

Yes, the original problem regarding the thread title is now solved
Now the event is fired and I can call my B4I sub passing 'customAttribute' as a param.
B4I

B4X:

Sub MOCABeaconDetected(identifier As String)
    Log("Identifier: "&identifier)
End Sub

And this is in the Inline Obj-C part

B4X:

-(BOOL)action:(MOCAAction*)sender performCustomAction:(NSString*)customAttribute withSituation:(MOCAFireSituation)situation{
    [self.bi raiseEvent:nil event:@"mocabeacondetected:" params:@[customAttribute]];
    return TRUE;
}

However, I have a doubt: I only need the 'customAttirbute' param for my project, but I'm curious how to interpret/read/parse the rest ('withSituationMOCAFireSituation)situation')

JanPRO · Apr 15, 2018

Hi,

JordiCP said:
but I'm curious how to interpret/read/parse the rest ('withSituationMOCAFireSituation)situation')

although situation is declared as a MOCAFireSituation object you can handle it as an integer. This type is defined in MOCAProximityService:

B4X:

typedef NS_ENUM(NSInteger, MOCAFireSituation) {
    // Indicates that an action is fired automatically by a proximity trigger
    // when the app is foreground or background.
    MOCAFiredByProximity,
    // Indicates that an action is fired by a user clicking a push notification
    // generated previously by proximity action fired in background.
    MOCAFiredByPushClicked
};

Probably MOCAFiredByProximity has the value 0 and MOCAFiredByPushClicked 1, but you can try this out.

Jan

JordiCP · Apr 15, 2018

Yes, that worked!
Indeed it was a 0

Thanks for all the hints

iOS Question [Solved] How to implement a given SDK protocol callback in Obj-C?

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