iOS Xcode Custom Keyboard Extension advanceToNextInputMode() Not Working in UITabViewController -

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i using uitabcontrollerview via storyboard in custom keyboard app extension swift. there no exceptions when debug , unable switch next keyboard calling advancetonextinputmode(). here structure.

i attempted adding advancetonextinputmode() call didappear function created uibutton. neither works.

thank you

enter image description here

i found in identity inspector of tabbaritem use switch keyboards had set uiviewcontroller. after switching uiinputviewcontroller worked fine.


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