Peak Userland

This is a Peak module that enables function native od JS function calls from within your application (userland). The core module itself already has a couple of internal methods like the Logger which it uses to communicate between the native and iOS world.

You obviously want your very own function calls like f.ex. when a user clicks on a button in a webview you might want to trigger a native method. This is where this userland module comes to action. Like Peak Core itself it uses method definitions to prevent any typos in function calls.

Installation

1. Add the peak userland library to your JS project via NPM npm install @peak-app/peak-userland --save
2. Tell peak to use the userland module:

const methodDefinitions = require('./method-definitions');
const peakUserland = peak.useModule(require('@peak-app/peak-userland'), methodDefinitions);

Method definitions

Define all the methods, that you need in this particular App. In this example we will build an mobile App that has a calculator functionality. This calculator stores the latest result within the native App bundle.

We might need clear() as a JS function to reset the calculator and storeResult(result) aswell as getLastResult() as native methods that we then call from within JS.

Our method-definitions.js file might look like this:

module.exports = {
   native: [
      {
      	name: 'storeResult',		
      	payloadType: 'number'
      },
      {
        name: 'getLastResult',
        callbackDataType: 'number'
      }
   ],
   js: [
      {
         name: 'clear'
      }
   ]
}

After defining all required methods we now just have to implement them.

Implementing and binding JS Functions

We only have one JS function, this could be implemented like this:

// grab a reference to the userland module
const userland = peak.modules.peakUserland 

userland.bind('clear', () => {
   // do whatever clear does...
   
   // Use peaks internal logger either through peak.logger.info() or conveniently via peak.info() or peak.error()
   peak.info("We have cleared the UI!")
})

// After binding a method to the userland module, you could also access it through:
userland.clear()
  

Call native methods

// all native methods defined in the method definitions are callable like this:
userland.storeResult(120);