Merge pull request nathantannar4#152 from AndrewSB/dismissal-animations

InputTextView: allow setting of canBecomeFirstResponder + add example

Example/Example/SubviewExampleViewController.swift

@@ -28,5 +28,22 @@ final class SubviewExampleViewController: CommonTableViewController {
         // Binding to the tableView will enabled interactive dismissal
         keyboardManager.bind(to: tableView)
     }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+
+        /// This replicates instagram's behavior when commenting in a post. As of 2020-09, it appears like they have one of the best product experiences of this handling the keyboard when dismissing the UIViewController
+        self.inputBar.inputTextView.resignFirstResponder()
+        /// This is set because otherwise, if only partially dragging the left edge of the screen, and then cancelling the dismissal, on viewDidAppear UIKit appears to set the first responder back to the inputTextView (https://stackoverflow.com/a/41847448)
+        self.inputBar.inputTextView.canBecomeFirstResponder = false
+    }
+
+    override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+
+        /// The opposite of `viewWillDisappear(_:)`
+        self.inputBar.inputTextView.canBecomeFirstResponder = true
+        self.inputBar.inputTextView.becomeFirstResponder()
+    }
 
 }

Sources/Views/InputTextView.swift

@@ -64,6 +64,12 @@ open class InputTextView: UITextView {
 
     open var isImagePasteEnabled: Bool = true
 
+    private var canBecomeFirstResponderStorage: Bool = true
+    open override var canBecomeFirstResponder: Bool {
+        get { canBecomeFirstResponderStorage }
+        set(newValue) { canBecomeFirstResponderStorage = newValue }
+    }
+
     /// A UILabel that holds the InputTextView's placeholder text
     public let placeholderLabel: UILabel = {
         let label = UILabel()