If you have no ideas about these operations, you can refer to our book, Beginning iOS 8 Programming with Swift or refer to this tutorial (in Objective-C). You should know how to insert and retrieve data through Core Data. Note that I assume you have a basic understanding of Core Data. Once you understand how data preloading works, I will show you how to use an existing SQLite database (again pre-filled with data) in your app. I will walk you through both approaches by building a simple demo app. By storing the file in the cloud or other external sources, this would allow you to update the data easily, without rebuilding the app. The data file can be either bundled in the app or hosted on a cloud server. At the time when the app is fully launched, it will be able to use the database, which has been pre-filled with data. When the user launches the app for the very first time, it preloads the data from the data file and puts them into the database. So how can you preload existing data into the built-in SQLite database of your app? In general you bundle a data file (in CSV or JSON format or whatever format you like). I will answer the above questions and show you how to preload your app with existing data. This is why I devote this tutorial to talk about data preloading in Core Data. I believe some of you may have the same question. The real question is: how could he preload the existing dictionary data into the database? He knows how to save data into the database and retrieve them back from the Core Data store. I recently met a friend who is now working on a dictionary app for a particular industry.
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