Need to create an Objective-C method in Xcode and invoke it from JavaScript Cordova App

Question

I have created a Cordova App and created iOS platform. I have a requirement to create an Objective-C method in Xcode and invoke it from JavaScript/HTML page.

The code in AppDelegate.h is

#import <Cordova/CDVViewController.h>
#import <Cordova/CDVAppDelegate.h>

@interface AppDelegate : CDVAppDelegate {}

@end

The code in AppDelegate.m is

#import "AppDelegate.h"
#import "MainViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
    self.viewController = [[MainViewController alloc] init];
    return [super application:application didFinishLaunchingWithOptions:launchOptions];
}

@end

Any step-by-step tutorial or example?

Objective C function? I am new to xocde/objective C. Need is a call from javascript and print NSLOG(@"Successfully a obj c method called from a javascript function"); — GMan
– GMan, Commented Jul 15, 2016 at 10:34

redent84 · Accepted Answer · 2016-07-15 12:07:10Z

In Cordova, a native function that can be called from JavaScript is made using a plugin. Take a look at the Plugin Development Guide to create your own plugin or search for already existing plugins that implement the functionality that you need.

This sample is extracted from the iOS Plugin Development Guide:

1. Declare javascript function

window.echo = function(str, callback) {
    cordova.exec(callback, function(err) {
        callback('Nothing to echo.');
    }, "Echo", "echo", [str]);
};

2. Implement platform specific code:

/********* Echo.h Cordova Plugin Header *******/

#import 

@interface Echo : CDVPlugin

- (void)echo:(CDVInvokedUrlCommand*)command;

@end

/********* Echo.m Cordova Plugin Implementation *******/

#import "Echo.h"
#import 

@implementation Echo

- (void)echo:(CDVInvokedUrlCommand*)command
{
    CDVPluginResult* pluginResult = nil;
    NSString* echo = [command.arguments objectAtIndex:0];

    if (echo != nil && [echo length] > 0) {
        pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsString:echo];
    } else {
        pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR];
    }

    [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
}

@end

3. Create plugin config file:

<platform name="ios">
    <config-file target="config.xml" parent="/*">
        <feature name="Echo">
            <param name="ios-package" value="Echo" />
        </feature>
    </config-file>
</platform>

4. Call this function from Javascript:

window.echo("echome", function(echoValue) {
    alert(echoValue == "echome"); // should alert true.
});

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