iPhone checking for existence of AVCaptureSession Class

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?

score 2 · Accepted Answer · answered Sep 17 '10 at 14:54

2

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")) {
    ...
}

answered Sep 17 '10 at 14:54

bosmacs

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It worked! thanks alot. For note, I had to also weak-link other libraries like CoreVideo and UIKit. – adranale Sep 20 '10 at 09:00
1

`objc_getClass` is more efficient. – rpetrich Mar 14 '11 at 08:23

iPhone checking for existence of AVCaptureSession Class

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