Custom implementation of UITextInput does not show multistage input suggestions

Question

I have my own based text editor UITextInput. It works very well, with the exception of multi-step input through selected text.

My marked area is displayed correctly, and the marked text is inserted, but the list of candidates above the keyboard is empty.

For example, here is a Japanese (Kana) keyboard showing suggestions for the UITextView standard:

And here is my custom editor displaying the same selected text:

I spent a few days debugging this problem and found that the cause is a private class UIKeyboardImplreturning NOfor a methoddelegateSupportsCorrectionUI

UIKeyboardImpl YES , . ( ).

Apple SimpleTextInput. . SimpleTextInput , UITextInput, , .

( , "" SimpleTextInput . , UITextInput - . .)

Answer 1

, . :

@property(nonatomic, readonly) UIView *textInputView

, . ( UITextInput.) , .

.

@synthesize 'd , UITextInput nil textInputView. , , , .

. .