![]() ![]() It also means applications can move freely from the Suspended state back into the Backgrounded state without drawing on system resources. Keeping an application's process alive ensures that the application launches quickly the next time the user opens it. Since the introduction of multitasking support, iOS rarely terminates idle applications, and instead keeps their processes Suspended in memory. This happens in low-memory situations, or if the user manually terminates the application. Return to Not Running/Termination (Rare) - Occasionally, the application's process is destroyed, and the application returns to the Not Running state.A suspended application's process is kept alive, but the application is unable to execute any code in this state. Suspended - If the application does not have any code to run in the background, or if all code has completed, the app will be Suspended by the OS.Backgrounded - The application moves into the background and continues executing background code.Inactive - The application is interrupted by an incoming phone call, text, or other interruption.Running/Active - The application is on the screen, and is executing code in the foreground.Not Running - The application has not yet been launched on the device.The movement is illustrated by the following diagram: An application transitions between states based on the behavior of the user and the backgrounding requirements of the application. The iOS application lifecycle is a collection of application states and methods for moving between them. Īpplication States and Application Delegate Methodsīefore we dive into the code for background processing in iOS, we need to understand how backgrounding affects the lifecycle of an iOS application. As of iOS 7, applications can also register to update content in the background using Background Fetch or Remote Notifications. Enable Background Updates - Applications can trigger background updates with Region Monitoring or by listening for Significant Location Changes.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. 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.For example, an application might need to finish logging in a user, or finish downloading a large file. 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. ![]() IOS regulates background processing very tightly, and offers three approaches to implement it: ![]()
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