Storing Your App’s Data
Lerne, Apps für iPhone und iPad zu programmieren
Im Schnellverfahren zur Karriere, die dir vorschwebt.
Persisting data is a core skill for any iOS developer. This course will teach you two techniques for storing data to your device’s hard drive: the NSKeyedArchiver method and the more complex, but robust Core Data.
Rich Learning Content
Taught by Industry Pros
Student Support Community
Dieser kostenlose Kurs ist der erste Schritt auf dem Weg zu einer neuen Karriere mit dem Werde iOS Developer Programm.
Erweitere deine Fähigkeiten und Karriere durch innovatives und unabhängiges Lernen.
This course assumes extensive iOS experience. Specifically, you’ve built several apps, know how to use core iOS libraries, and are familiar with networking and MVC design principles. Introduction to iOS App Development with Swift, UIKit Fundamentals, and iOS Networking with Swift are good courses to take if you need to familiarize yourself with these concepts.
The course also assumes basic familiarity with git. Specifically, you will need to be able to clone git repositories and checkout branches specific to each lesson. How to Use Git & GitHub is a great option if you need to brush up on these skills.
You will need access to a Mac computer running OS X 10.9 or later. However, you do not need an iPad or iPhone to complete the activities. All exercises can be completed using the iOS simulator built into Xcode.
Detaillierte technische Voraussetzungen
Just like computers, your iPhone has two types of memory: main memory (RAM) and the hard drive. In all the apps you’ve written, you’ve interacted with RAM, but this memory is limited, and it’s important that the apps you design use it as efficiently as possible. To use the RAM efficiently it is important to be able to store data on the hard drive.
It is also important for your apps to maintain state when they are turned off. The apps you’ve built probably aren’t persistent, meaning that they don’t save their state to the device’s hard drive. As RAM is volatile, data is lost when the app stops running. In this course, you’ll learn how to persist the state of the device using NSKeyedArchiver and Core Data.