ASWebAuthenticationSession on iOS 13

Question

I installed iOS 13, the authentication via Safari no longer works. I have the same configuration on iOS 12 except self.authSessionAS.presentationContextProvider = self;

self.authSessionAS = [[ASWebAuthenticationSession alloc]initWithURL:[[NSURL alloc] initWithString:self.authUrl] callbackURLScheme:@"app://" completionHandler:^(NSURL * _Nullable callbackURL, NSError * _Nullable error) {
    if(callbackURL)
    {
        self.resultStream(callbackURL.absoluteString);
    }else
    {
        self.resultStream(@"");
    }
    self.resultStream = NULL;
}];

self.authSessionAS.presentationContextProvider = self;
[self.authSessionAS start];

Solution

I find a solution

Add above the implementation.

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
@interface AppDelegate() <ASWebAuthenticationPresentationContextProviding>
@end
#endif

In your code for Auth.

self.authSessionAS = [[ASWebAuthenticationSession alloc]initWithURL:[[NSURL alloc] initWithString:self.authUrl] callbackURLScheme:@"app://" completionHandler:^(NSURL * _Nullable callbackURL, NSError * _Nullable error) {
    if(callbackURL)
    {
        self.resultStream(callbackURL.absoluteString);
    }else
    {
        self.resultStream(@"");
    }
    self.resultStream = NULL;
}];

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
if (@available(iOS 13, *)) {
    self.authSessionAS.presentationContextProvider = self;
}
#endif

[self.authSessionAS start];

Add method

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
#pragma mark - ASWebAuthenticationPresentationContextProviding
- (ASPresentationAnchor)presentationAnchorForWebAuthenticationSession:(ASWebAuthenticationSession *)session  API_AVAILABLE(ios(13.0)){
   return UIApplication.sharedApplication.keyWindow;
}
#endif

Comments

[Richard]

Agreed. Have some code that runs on both iOS 12 and 13... With iOS 12, it correctly detects the cookie and uses it to prefill the login screen. With iOS 13, it doesn't detect the cookie and presents the default login screen. Presumably a bug in iOS 13...

[Richard]

Addendum... If the app is compiled in Xcode 10 (iOS 12 release) then ASWebAuthenticationSession broadly works on iOS 13 (although it doesn't pick up the cookie).

[Richard]

Compared to Xcode 11, where ASWebAuthenticationSession doesn't work on iOS 13 at all -- completely broken. Don't know what happens if compiled on Xcode 11 and run on iOS 12.

[lsaudon]

I find this solution dev.to/robotsquidward/…, but I don't know how to implement it in objective-c and flutter.

[lsaudon]

For flutter developers, check pub.dev/packages/flutter_web_auth

[Turnipdabeets]

What's the difference between using #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000 or if #available(iOS 13.0, *)?