IOS Skeleton App with Local Storage using SWIFT 4.x

We need an iOS Skeleton App designed and developed with Local Storage using SWIFT 4.x. The app needs to have a login feature. The app will be communicating with an external API to do CRUD operations on a specific object e.g. job, customer, block etc. we only need one to be included as part of this project. Below is the premise of what we're trying to achieve.

1. User logs into the app
2. On successful login, the API call will return a token which is then used for all API calls until it expires or user logs out.
3. The user will do a variety of CRUD operations on a specific object via API
4. [This is the important part] If a user is in the middle of an operation and they lose their data connection (3G/4G/Wifi), we would like for the app to store the procedure or operation locally on the device. When the device gets an active data connection, the app should then submit/complete the operation that was interrupted.
5. Sample mocks will be provided

This is the basis of what we want to be developed, we will give further details for clarity.