Xingchen Yu created CB-9441:
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Summary: cordova-plugin-dialogs alert does not show on iOS when
there's another plugin on top of the UIVIewController
Key: CB-9441
URL: https://issues.apache.org/jira/browse/CB-9441
Project: Apache Cordova
Issue Type: Bug
Components: iOS, Plugin Dialogs
Affects Versions: 3.5.0
Reporter: Xingchen Yu
navigator.notifications.alert / confirm is supposed to display a dialog on top
of the app, however when there's another plugin that's being shown (such as
InAppBrwoser or its forks), navigator.notifications.alert / confirm will do
nothing. In Xcode console you can see the following warning:
Warning: Attempt to present UIAlertController on MainViewController whose view
is not in the window hierarchy
Reproduction step:
1. Install cordova-plugin-dialogs
2. Install cordova-plugin-inappbrowser
3. Create a dummy button that launches InAppBrowser
4. Listen to one of InAppBrowser's events, such as loadstop. Inside the event
listener, call navigator.notification.alert / confirm
5. Build iOS
6. Click dummy button to launch InAppBrowser. Observe that alert does not show
up and the above warning in Xcode console.
7. More conveniently, simply connect to Safari debugger, call
navigator.notification.alert / confirm in JavaScript console while InAppBrowser
is shown. Observe same issue as step 6.
I have already debugged this issue, so please allow me to explain. iOS only
allows you to stack a new UIViewController on top of the top most
UiViewController. In case of cordova-plugin-dialogs, it simply stacks on top of
self.viewController, which is the app's default UIViewController. However when
another plugin (think InAppBrowser) that also stacks on top of
self.viewController, now the other plugin is the top most UIViewController, and
iOS prevents further UIViewController to be stacked on self.viewController.
Therefore cordova-plugin-dialogs now does nothing but a warning from Xcode
console.
This issue is somewhat related to CB-9347 and its pull request
https://github.com/apache/cordova-plugin-dialogs/pull/54 can mostly fix this
issue along with it. However CB-9347 addresses a very different use case, and
it doesn't address a case where a third party plugin may be in the process of
dismissing and navigator.notification.alert / confirm may be called.
I can contribute a pull request, but I'd like to see CB-9347 accepted first, so
I can test it out and take appropriate actions, since CB-9347 is highly related
in coding.
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