How do I check for availability of a symbol, rather than OS version, in Swift?

Asked Dec 23 '16 at 04:12

Active Dec 23 '16 at 07:51

Viewed 349 times

I have code of the form

if #available(iOS 10.2, *) {
    device = AVCaptureDeviceType.builtInDualCamera
} else {
    device = AVCaptureDeviceType.builtInDuoCamera
}

if #available(AVCaptureDeviceType.builtInDualCamera) {

... possible?

The latter expresses my intention better — if the value builtInDualCamera exists, use it. I couldn't care less whether it was introduced in iOS 10.1 or .2 or .3.

edited Dec 23 '16 at 07:51

asked Dec 23 '16 at 04:12

Kartick Vaddadi

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Maybe `responds(to: Selector)`? – Sweeper Dec 23 '16 at 04:20
1

See https://forums.developer.apple.com/thread/64332 – Anurag Dec 23 '16 at 04:25
It's a constant, not a method, so respondsToSelector doesn't work. – Kartick Vaddadi Dec 23 '16 at 04:36
For better or worse, that isn't the way Apple has done it; you need to check for the app version rather than a specific symbol. – Paulw11 Dec 23 '16 at 04:50

How do I check for availability of a symbol, rather than OS version, in Swift?

0 Answers0