Launching an app into the foreground
Launching an app into the background
iOS regulates background processing very tightly, and offers three approaches to implement it:
- Register a Background Task - If an application needs to complete an important task, it can ask iOS not to interrupt the task when the application moves into the background. For example, an application might need to finish logging in a user, or finish downloading a large file.
- Register as a Background-Necessary Application - An app can register as a specific type of application that has known, specific backgrounding requirements, such as Audio, VoIP, External Accessory,Newsstand, and Location. These applications are allowed continuous background processing privileges as long as they are performing tasks that are within the parameters of the registered application type.
- Enable Background Updates - Applications can trigger background updates with Region Monitoring or by listening for Significant Location Changes. As of iOS 7, applications can also register to update content in the background using Background Fetch or Remote Notifications.
Change of App State in iOS
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