InputAccessoryView / View Pinned to Keyboard with

问题:

Is there an equivalent to InputAccessoryView in SwiftUI (or any indication one is coming?)

And if not, how would you emulate the behavior of an InputAccessoryView (i.e. a view pinned to the top of the keyboard)? Desired behavior is something like iMessage, where there is a view pinned to the bottom of the screen that animates up when the keyboard is opened and is positioned directly above the keyboard. For example:

Keyboard closed:

Keyboard open:

回答1:

I got something working which is quite near the wanted result. So at first, it's not possible to do this with SwiftUI only. You still have to use UIKit for creating the UITextField with the wanted "inputAccessoryView". The textfield in SwiftUI doesn't have the certain method.

First I created a new struct:

import UIKit
import SwiftUI

struct InputAccessory: UIViewRepresentable  {

    func makeUIView(context: Context) -> UITextField {

        let customView = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: 44))
        customView.backgroundColor = UIColor.red
        let sampleTextField =  UITextField(frame: CGRect(x: 20, y: 100, width: 300, height: 40))
        sampleTextField.inputAccessoryView = customView
        sampleTextField.placeholder = "placeholder"

        return sampleTextField
    }
    func updateUIView(_ uiView: UITextField, context: Context) {
    }
}

With that I could finally create a new textfield in the body of my view:

import SwiftUI

struct Test: View {
    @State private var showInput: Bool = false
    var body: some View {
        HStack{
            Spacer()
            if showInput{
                InputAccessory()
            }else{
                InputAccessory().hidden()
            }
        }
    }
}

Now you can hide and show the textfield with the "showInput" state. The next problem is, that you have to open your keyboard at a certain event and show the textfield. That's again not possible with SwiftUI and you have to go back to UiKit and making it first responder. If you try my code, you should see a red background above the keyboard. Now you only have to move the field up and you got a working version.

Overall, at the current state it's not possible to work with the keyboard or with the certain textfield method.