ios - How to make offline database for my app?

Question

I am getting problem in consuming RestAPI and saving offline data. Is any one have best ideas about this.

I want to save JSON response from server in local database and use that data when no internet is available. like Firebase realtime Database.

Answer 1

I think what are you asking for is a mechanism to persist data into your application. There are several approaches to achieve this. Although it could be too broad to provide detailed answer, you might want to check as options:

Databases:

• Core Data:

Core Data is an object graph and persistence framework provided by Apple in the macOS and iOS operating systems. It was introduced in Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0. It allows data organized by the relational entity–attribute model to be serialized into XML, binary, or SQLite stores. The data can be manipulated using higher level objects representing entities and their relationships. Core Data manages the serialized version, providing object lifecycle and object graph management, including persistence. Core Data interfaces directly with SQLite, insulating the developer from the underlying SQL.

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• SQLite -with a wrapper such as SQLite.swift-

SQLite is a relational database management system contained in a C programming library. In contrast to many other database management systems, SQLite is not a client–server database engine. Rather, it is embedded into the end program.

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• Realm:

Realm is an open-source object database management system, initially for mobile (Android/iOS), also available for platforms such as Xamarin or React Native, and others, including desktop applications (Windows), and is licensed under the Apache License.

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Other Alternatives:

• UserDefaults:

The UserDefaults class provides a programmatic interface for interacting with the defaults system. The defaults system allows an app to customize its behavior to match a user’s preferences. For example, you can allow users to specify their preferred units of measurement or media playback speed. Apps store these preferences by assigning values to a set of parameters in a user’s defaults database. The parameters are referred to as defaults because they’re commonly used to determine an app’s default state at startup or the way it acts by default.

• Saving Data to plist files:

In the macOS, iOS, NeXTSTEP, and GNUstep programming frameworks, property list files are files that store serialized objects. Property list files use the filename extension .plist, and thus are often referred to as p-list files.

Property list files are often used to store a user's settings. They are also used to store information about bundles and applications, a task served by the resource fork in the old Mac OS.

• Saving Data to json files:

In computing, JavaScript Object Notation or JSON is an open-standard file format that uses human-readable text to transmit data objects consisting of attribute–value pairs and array data types (or any other serializable value). It is a very common data format used for asynchronous browser–server communication, including as a replacement for XML in some AJAX-style systems.

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