iPhone checking for existence of AVCaptureSession Class
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03-10-2019 - |
Question
I have integrated a library that uses AVCaptureSession to capture a photo from the camera. As the AVCaptureSession is only available on iOS 4 devices, I want to disable this integrated functionality for older devices.
I know that it should be done by weak-linking the AVFoundation Framework and checking for function existence. Weak-linking is easy to do, but which function should I check for existence here? AVCaptureSession is a class and not a function.
Are there some sample code available?
Solution
I think you're looking for NSClassFromString
:
Class NSClassFromString ( NSString *aClassName );
You can then guard usage of that class with something like this:
if (NSClassFromString(@"AVCaptureSession")) {
...
}
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