[TIMOB-18282] iOS:Push notification callback is not working when app is being opened directly from app drawer.

var Cloud = require("ti.cloud");

var win = Ti.UI.createWindow({
	backgroundColor : 'white',
	layout : 'vertical',
	exitOnClose : true
});

var subscribeBtn = Ti.UI.createButton({
	title : 'Subscribe',
	top : 50,
});
subscribeBtn.addEventListener('click', function() {
	loginUser();
});

function loginUser() {
	// Log in to ACS
	Cloud.Users.login({
		login : 'userName',
		password : 'PASS'
	}, function(e) {
		if (e.success) {
			alert('Login successful');
			subscribeToChannel();
		} else {
			alert('Error:\n' + ((e.error && e.message) || JSON.stringify(e)));
		}
	});
}

//Retrive Device token

var deviceToken = null;

// Check if the device is running iOS 8 or later
if (Ti.Platform.name == "iPhone OS" && parseInt(Ti.Platform.version.split(".")[0]) >= 8) {
	function registerForPush() {
		Ti.Network.registerForPushNotifications({
			success : deviceTokenSuccess,
			error : deviceTokenError,
			callback : receivePush
		});
		// Remove event listener once registered for push notifications
		Ti.App.iOS.removeEventListener('usernotificationsettings', registerForPush);
	};

	// Wait for user settings to be registered before registering for push notifications
	Ti.App.iOS.addEventListener('usernotificationsettings', registerForPush);

	// Register notification types to use
	Ti.App.iOS.registerUserNotificationSettings({
		types : [Ti.App.iOS.USER_NOTIFICATION_TYPE_ALERT, Ti.App.iOS.USER_NOTIFICATION_TYPE_SOUND, Ti.App.iOS.USER_NOTIFICATION_TYPE_BADGE]
	});

} else {
	// For iOS 7 and earlier
	Ti.Network.registerForPushNotifications({
		// Specifies which notifications to receive
		types : [Ti.Network.NOTIFICATION_TYPE_BADGE, Ti.Network.NOTIFICATION_TYPE_ALERT, Ti.Network.NOTIFICATION_TYPE_SOUND],
		success : deviceTokenSuccess,
		error : deviceTokenError,
		callback : receivePush
	});
}

// Process incoming push notifications
function receivePush(e) {
	alert('Received push: ' + JSON.stringify(e));
}

// Save the device token for subsequent API calls
function deviceTokenSuccess(e) {
	deviceToken = e.deviceToken;
}

function deviceTokenError(e) {
	alert('Failed to register for push notifications! ' + e.error);
}

function subscribeToChannel() {
	Cloud.PushNotifications.subscribeToken({
		device_token : deviceToken,
		channel : 'news_alerts',
		type : Ti.Platform.name == 'android' ? 'android' : 'ios'
	}, function(e) {
		if (e.success) {
			alert('Subscribed');
		} else {
			alert('Error:\n' + ((e.error && e.message) || JSON.stringify(e)));
		}
	});
}

win.add(subscribeBtn);
win.open();