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# iOS tutorials
## Welcome to the GStreamer iOS tutorials
These tutorials describe iOS-specific topics. General GStreamer
concepts will not be explained in these tutorials, so the
[](sdk-basic-tutorials.md) should be reviewed first. The reader should
also be familiar with basic iOS programming techniques.
The iOS tutorials have the same structure as the
[](sdk-android-tutorials.md): Each one builds on top of the previous
one and adds progressively more functionality, until a working media
player application is obtained in
[](sdk-ios-tutorial-a-complete-media-player.md).
Make sure to have read the instructions in
[](sdk-installing-for-ios-development.md) before jumping into the iOS
tutorials.
All iOS tutorials are split into the following classes:
- The `GStreamerBackend` class performs all GStreamer-related tasks
and offers a simplified interface to the application, which does not
need to deal with all the GStreamer details. When it needs to
perform any UI action, it does so through a delegate, which is
expected to adhere to the `GStreamerBackendDelegate` protocol.
- The `ViewController` class manages the UI, instantiates the
`GStreamerBackend` and also performs some UI-related tasks on its
behalf.
- The `GStreamerBackendDelegate` protocol defines which methods a
class can implement in order to serve as a UI delegate for the
`GStreamerBackend`.
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