Swift - uiDelegate must either be a UIViewController or implement the signIn:presentViewController: & signIn:dismissViewController: methods

Question

From the Crashlytics, we are receiving a large amount of crash reports in the Google Login process. The crash report is as follows:

Fatal Exception: NSInvalidArgumentException
uiDelegate must either be a |UIViewController| or implement the |signIn:presentViewController:| and |signIn:dismissViewController:| methods from |GIDSignInUIDelegate|.

Fatal Exception: NSInvalidArgumentException
0  CoreFoundation                 0x1837f2db0 __exceptionPreprocess
1  libobjc.A.dylib                0x182e57f80 objc_exception_throw
2  CoreFoundation                 0x1837f2cf8 -[NSException initWithCoder:]
3  Hello English                  0x100583d18 -[GIDSignIn assertValidUIDelegate] (GIDSignIn.m:512)
4  Hello English                  0x1005861dc -[GIDSignIn signInWithOptions:] (GIDSignIn.m:961)
5  Hello English                  0x10058a0e4 -[GIDSignInButton pressed] (GIDSignInButton.m:385)
6  UIKit                          0x188988be8 -[UIApplication sendAction:to:from:forEvent:]
7  UIKit                          0x188988b64 -[UIControl sendAction:to:forEvent:]
8  UIKit                          0x188970870 -[UIControl _sendActionsForEvents:withEvent:]
9  UIKit                          0x188988454 -[UIControl touchesEnded:withEvent:]
10 UIKit                          0x188988084 -[UIWindow _sendTouchesForEvent:]
11 UIKit                          0x188980c20 -[UIWindow sendEvent:]
12 UIKit                          0x18895104c -[UIApplication sendEvent:]
13 UIKit                          0x18894f628 _UIApplicationHandleEventQueue
14 CoreFoundation                 0x1837a909c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
15 CoreFoundation                 0x1837a8b30 __CFRunLoopDoSources0
16 CoreFoundation                 0x1837a6830 __CFRunLoopRun
17 CoreFoundation                 0x1836d0c50 CFRunLoopRunSpecific
18 GraphicsServices               0x184fb8088 GSEventRunModal
19 UIKit                          0x1889ba088 UIApplicationMain
20 Hello English                  0x10029b2cc main (AppDelegate.swift:26)
21 libdispatch.dylib              0x18326e8b8 (Missing)

We've tried so far:

1. Moved GIDSignIn.sharedInstance().uiDelegate = self from viewDidLoad() to viewDidAppear(animated: Bool)
2. We've also implemented all three methods of GIDSignInUIDelegate with no success.
3. Our view controller was not direct child of UIViewController, but now it is and the crashes are still counting.
4. We were using simple UIButton, so we thought that might be cause (though illogical, but we tried) of crash; we changed it to GIDSignInButton, but no reduction in crash-count.

For now we have removed the Google Login process, but it is not the solution. And strange thing is that we are unable to reproduce this crash at our end; we are only getting these crashes on Crashlytics.

So Anyone with any solution ?

Answer 1

you need to write these lines in viewWillAppear method of UIViewController.

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(true)

    GIDSignIn.sharedInstance().uiDelegate = self
    GIDSignIn.sharedInstance().delegate = self
}

Answer 2

In GoogleSignIn SDK 5.0 and above GIDSignInUIDelegate has been revoked

So Instead of

GIDSignIn.sharedInstance().uiDelegate = self

Add this below line, for conforming to presenting login view

GIDSignIn.sharedInstance()?.presentingViewController = self