Why after each entered letter in TextField keyboard closes and how to fix it better?

Question

I have ObservableObject for my parent view and child view:

import Parchment

class MainViewModel: ObservableObject {
    @Published var inputText = String()

    init() {}
}

struct ChildView: View {
    @EnvironmentObject var viewModel: MainViewModel

    var body: some View {
          PageView(/**/) {
          TextField("", $viewModel.inputText)
}
}
    }
}

I tried to put inputText in child view's ObservedObject but got no changes.

When I'm entering one letter, keyboard closes. I think that SwiftUI starts redrawing of whole page, and because of this TextField becomes inactive.

How to fix this? Maybe somehow activate TextField by force, or start keyboard?

[How to create a Minimal, Reproducible Example](https://stackoverflow.com/help/minimal-reproducible-example)... I think it is in `PageView`, because standard components work fine. — Asperi, Jun 08 '20 at 11:41
@Asperi I think so. But I need ViewPager for my project, so perhaps you could help me with "kludge"? " Maybe somehow activate TextField by force, or start keyboard?" — snitron, Jun 08 '20 at 11:51
@Asperi yep. It's in Parchment framework. https://github.com/rechsteiner/Parchment/blob/master/Parchment/Structs/PageView.swift — snitron, Jun 08 '20 at 11:55

Pranav Kasetti · Accepted Answer · 2020-06-08T14:32:36.843

Your current code doesn't compile on my 2.4.0 version of Parchment, and SwiftUI so I've tried to infer various details - the code works fine in native SwiftUI components. I would consider re-architecting the code though so that the @Published property references a Model object - this is better SoC and allows to be shared better (given your EnvironmentObject I suspect you are passing this view model to multiple views).

Parchment is not ideal as mentioned by @Asperi. PageView wraps a UIViewController as the paging controller, and each page is nested inside another UIHostingController! A better approach is to make PagingController a wrapped UIPageViewController for the Scene conforming to UIViewControllerRepresentable, with UIViewControllers. I would just implement this from scratch than use Parchment - it may be overkill, and perhaps some aspects could be designed better.

I may be missing something, but it's hard to help without further code in context. Also, from your example, setting PageView in the parent view makes more sense and that your subviews in parent view controller should not capture touches (set userInteractionEnabled to false in UIKit or View modifier .disabled(true) in SwiftUI). This is if ParentView is overlaid on top of ChildView.

Why after each entered letter in TextField keyboard closes and how to fix it better?

1 Answers1