Material: TextField in SearchBar cannot become the first responder

[robertying]

I was trying to make the textField in searchBar the first responder, but it always failed.

What I have done:

• searchBar.textField.canBecomeFirstResponder returns true
• searchBar.textField.becomeFirstResponder() returns false
• look for the current first responder but returns nil

func findFirstResponder() -> Any?
    {
        if (self.isFirstResponder) {
            return self
        }
        for subView in self.view.subviews {
            if subView.isFirstResponder {
                return subView
            }
        }
        return nil
    }

I don't know whether I was missing something or It seems to be a bug.
Any help would be appreciated.

• Xcode 9 beta 5
• iOS 10.3

[danieldahan]

When are you calling this function? Can you send me a sample with this and I will take a look?

[robertying]

@danieldahan
I use the Search Sample from https://github.com/CosmicMind/Samples
I try to add searchBar.textField.becomeFirstResponder() in two places.

• prepareSearchBar() in AppSearchBarController.swift
• prepareSearchBar() in RootViewController.swift

Thanks for you time ;)

[danieldahan]

Yeah, I can see it is not working. Weird, well I shall take a look :)

[danieldahan]

Hey, so you need to call becomeFirstResponder() when the view controller has appeared, like so:

open override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        searchBar.textField.becomeFirstResponder()
    }

:) All the best!

[robertying]

That works! Thank you! ;)
I should have investigated the view life cycles better.

[danieldahan]

No worries :) I am happy to help.