Fix toolbar safeArea for external keyboard

If an external keyboard is available, it will not show the software keyboard, displaying the toolbar au the bottom of the screen.
And the `inputAccessoryView` doesn't respect the safeArea: http://www.openradar.me/34411433

Signed-off-by: Henrik Storch <henrik.storch@nextcloud.com>

iOSClient/Extensions/UIToolbar+Extension.swift

@@ -43,4 +43,35 @@ extension UIToolbar {
         toolbar.setItems(buttons, animated: false)
         return toolbar
     }
+
+    // by default inputAccessoryView does not respect safeArea
+    var wrappedSafeAreaContainer: UIView {
+        let view = InputBarWrapper()
+        view.addSubview(self)
+        self.translatesAutoresizingMaskIntoConstraints = false
+        NSLayoutConstraint.activate([
+            self.topAnchor.constraint(equalTo: view.topAnchor),
+            self.leftAnchor.constraint(equalTo: view.leftAnchor),
+            self.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
+            self.rightAnchor.constraint(equalTo: view.rightAnchor)
+        ])
+        return view
+    }
+}
+
+// https://stackoverflow.com/a/67985180/9506784
+class InputBarWrapper: UIView {
+
+    var desiredHeight: CGFloat = 0 {
+        didSet { invalidateIntrinsicContentSize() }
+    }
+
+    override var intrinsicContentSize: CGSize { CGSize(width: 0, height: desiredHeight) }
+
+    required init?(coder aDecoder: NSCoder) { fatalError() }
+
+    override init(frame: CGRect) {
+        super.init(frame: frame)
+        autoresizingMask = .flexibleHeight
+    }
 }

iOSClient/Share/Advanced/NCShareCells.swift

@@ -284,7 +284,7 @@ class NCShareDateCell: UITableViewCell {
             self.onReload?()
         }
 
-        textField.inputAccessoryView = toolbar
+        textField.inputAccessoryView = toolbar.wrappedSafeAreaContainer
         textField.inputView = picker
 
         if let expDate = share.expirationDate {

iOSClient/Share/Advanced/NCShareNewUserAddComment.swift

@@ -57,7 +57,7 @@ class NCShareNewUserAddComment: UIViewController, NCShareDetail {
             self.share.note = self.noteTextField.text
         }
 
-        noteTextField.inputAccessoryView = toolbar
+        noteTextField.inputAccessoryView = toolbar.wrappedSafeAreaContainer
 
         guard let headerView = (Bundle.main.loadNibNamed("NCShareAdvancePermissionHeader", owner: self, options: nil)?.first as? NCShareAdvancePermissionHeader) else { return }
         headerContainerView.addSubview(headerView)