Importing Calendar events from iCloud IOS - ios

Hi i have researched regarding importing calendar events from iCloud. Some of the sites are suggesting EventKit framework but will EventKit framework provide events which are saved on iCloud?
There is option to get events from Calendar app in iPhone but need events saved on iCloud.

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How can we store firebase events offline and sync this events when device comes online bypassing 72 hours firebase offline sync limit?

We are having an enterprise application which is used in regions where there is no internet for many days. I am using Firebase for analytics and I have enabled firebase persistent storage which helps to send the analytics events to firebase when the device comes online but the limitation is it only sends 72 hours data to Firebase analytics. So, I want firebase to get at least offline analytics data of the last 10 days. Can I achieve this by storing this analytics event in core data when the device is offline and send this event to firebase when the device is connected to the internet? Or is there any alternative way to achieve this? I only want to send the event name and timestamp of the event.

Google App analytics/Firebase

I have implemented firebase to my iPhone app, in Google analytics on my Macbook I can see the reports when I switch Property in Admin section. But I can't see the data on Google Analytics application, all I can see is "All mobile App Data", which is basically just Google data after implemented Google analytics tracking code, not Firebase tracking.
Is there any way to see Firebase analytics data on the iphone app or do I have to implement Google analytics tracking code as well?
Or is there better tool for app analytics?
Thank you for suggestions
With Firebase installed, you can either:
Use Firebase Reporting in GA, which just displays the Firebase Analytics interface in GA.
Install GTM on your app alongside Firebase and use GTM to fire off tags to GA when certain Firebase events are fired.
Firebase mobile integration and GA mobile intergration are separate things.

Synchronize Google Calendar?

Im having a calendar inside my app and it is possible to synchronize that calendar with the apple calendar app on iOS (it then automatically synchronizes with icloud if enabled).
Now I want the same for the google calendar app on iOS but all I could find for now is the google calendar web API. The problem: you need to be online for that but my App should have a full offline support. So I thought maybe it would be possible to access the iOS google calendar app installed on the device to add / remove / modify events.
Is it possible to do so or is there now API for the iOS google calendar app?
There is currently no API that allows you to interact with the Google Calendar App for iOS.
The samples seen here are specifically for interacting with the Google Calendar service, not with the Google Calendar for iOS app itself.

CloudKit offline storage

I'm developing iOS app which is using CloudKit. I'm pretty clear how to download/upload data from cloud when requested on the device. It works just fine when internet connection is present. I'm thinking to allow users to access their data offline also. After brief research I discovered that CoreData integration with iCloud was depreciated as of recent Xcode release. I found some third party pods on github which let you handle this problem by syncing core data from device to iCloud. I'm a bit skeptical using those plugins due to possible data loss or other issues. Is the idea behind depreciating CloudKit to move away from offline storage? Im thinking now what to do... should I attempt to create some sort of sync between core data and iCloud or not use core data at all and just let users to access data only when online connection available. Such approach would save device storage but restrict data access to online only. Any recommendations ?
CoreData integration with iCloud is not depreciated, here are some references from Apple:
Setting up core data with CloudKit
Syncing a core data store with CloudKit
Mirroring a core data store with CloudKit
WWDC 2019 - Using Core Data With CloudKit

iOS sync calendar with google calendar at local app

I'm writing an app to sync with the built-in calendar.app using event kit. The built-in calendar.app will sync with Google Calendar when opening. However, my app will not sync with Google Calendar when opening.
Is there any method to sync with Google Calendar through the built-in calendar.app in code (open my app, and it will sync with Google Calendar without any setting)?
In iOS5 EKEventStore have refreshSourcesIfNecessary method.

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