iOS Swift自定义键盘默认系统操作

Question

I am trying to make a button on my custom keyboard perform the default system action as if I had pressed return on a hardware keyboard. How do I do that please.?

This is not simulating a specific keypress, such as a new line. I want the default system action for whatever app I am using to take place. iMessage, pressing return would send the message.

Answer 1

Inserting a newline into the text document proxy does this automatically:

Swift:

textDocumentProxy.insertText("\n")

Better yet, to make this more obvious, you could extend UITextDocumentProxy or its parent, UIKeyInput to add a method for this:

extension UIKeyInput{
    func `return`() -> Void{
         insertText("\n")
    }
}

That way, you can just call your method to do it:

textDocumentProxy.return()