Passing custom parameters to Phonegap plugin

Question

I have written a Phonegap plugin in order to integrate my Phonegap application with a native SDK library. In order to pass some device registration information to the native library I have used an Objective-C category to plug my own handler after didFinishLaunchingWithOptions, pretty much the same way the Phonegap Push Plugin does. I therefore have something like the following:

@implementation AppDelegate (MyLib)

// Using method swizzling to plug our own init method  which allows us to
// add our own listener for the didFinishLaunching event without overwriting
// the one already defined by Phonegap.
+ (void)load
{
    Method original, swizzled;

    original = class_getInstanceMethod(self, @selector(init));
    swizzled = class_getInstanceMethod(self, @selector(swizzled_init));
    method_exchangeImplementations(original, swizzled);
}

- (AppDelegate *)swizzled_init
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(launchHandler:)
                                                 name:@"UIApplicationDidFinishLaunchingNotification" object:nil];

    // This actually calls the original init method over in AppDelegate.
    return [self swizzled_init];
}

// This code will be called immediately after application:didFinishLaunchingWithOptions:.
- (void)launchHandler:(NSNotification *)notification
{
    NSString* apiKey = @"xxxxx";
    // Do some initialisation and register the device using the apiKey
}

@end

The apiKey is specific to my application and right now it is defined in AppDelegate+MyLib.m as shown in the code above. My question is, is there a way to allow my Phonegap app to customise this when importing the plugin? Could it be defined in my app's config.xml (or in any other place if that makes a difference) and somehow passed to the plugin's AppDelegate as a parameter?

Answer 1

Firts of all, you don't need to use swizzling, just read how to get the UIApplicationDidFinishLaunchingNotification from a CDVPlugin subclass

Customizing iOS's application:didFinishLaunchingWithOptions: method in a Cordova/Ionic project

Now you can use the preference tag on the config.xml

 <preference name="apiKey" value="yourApiKeyHere" />

Then, you get the "apiKey" on your code (on a CDVPlugin subclass) doing this:

NSString* apiKey = [self.commandDelegate.settings objectForKey:[@"apiKey" lowercaseString]];