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SodaLive/Sources/Keyboard/KeyboardHandler.swift

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+//
+//  KeyboardHandler.swift
+//  SodaLive
+//
+//  Created by klaus on 2023/08/09.
+//
+
+import SwiftUI
+import Combine
+
+final class KeyboardHandler: ObservableObject {
+    @Published private(set) var keyboardHeight: CGFloat = 0
+    
+    private var cancellable: AnyCancellable?
+    
+    private let keyboardWillShow = NotificationCenter.default
+        .publisher(for: UIResponder.keyboardWillShowNotification)
+        .compactMap { ($0.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect)?.height }
+    
+    private let keyboardWillHide = NotificationCenter.default
+        .publisher(for: UIResponder.keyboardWillHideNotification)
+        .map { _ in CGFloat.zero }
+    
+    init() {
+        cancellable = Publishers.Merge(keyboardWillShow, keyboardWillHide)
+            .subscribe(on: DispatchQueue.main)
+            .assign(to: \.self.keyboardHeight, on: self)
+    }
+}