How to do IS with an objective C class?

Question

I try to convert this ios/objective-c function under delphi Rio 10.3.3

func authorizationController(authorization: ASAuthorization) {
    if let appleIDCredential = authorization.credential as? ASAuthorizationAppleIDCredential { 

    } else if let passwordCredential = authorization.credential as? ASPasswordCredential {

    }
}

I set authorization.credential to be a pointer. Now my problem how with this pointer can I check the IS ASAuthorizationAppleIDCredential before to cast like for example :

if authorization.credential IS ASAuthorizationAppleIDCredential then 
  TASAuthorizationAppleIDCredential.wrap(authorization.credential);

Already asked (by you) and answered (by me) here: stackoverflow.com/a/59122544/3164070 — Dave Nottage
– Dave Nottage, Commented Apr 20, 2020 at 23:53

Garrigan Stafford · Accepted Answer · 2020-04-20 03:20:45Z

1

You would use the isKindOfClass: selector that is in NSobject. In your case

if([authorization.credential isKindOfClass:[AsAuthorizationAppleIDCredential class]])
{ // is that class }

https://developer.apple.com/documentation/objectivec/1418956-nsobject/1418511-iskindofclass?language=objc

EDIT: If you want to only perform one selector on the object you could also check if it performs that selector with respondsToSelector: https://developer.apple.com/documentation/objectivec/1418956-nsobject/1418583-respondstoselector?language=objc

answered Apr 20, 2020 at 3:20

Garrigan Stafford

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