Don't use numeric keyboard on iOS

Doesn’t have a done key which doesn’t work with our user model. May
find a better fix later.

src/FactSystem/FactControls/FactTextField.qml

-import QtQuick 2.2
-import QtQuick.Controls 1.2
-import QtQuick.Controls.Styles 1.2
-import QtQuick.Dialogs 1.2
+import QtQuick                  2.2
+import QtQuick.Controls         1.2
+import QtQuick.Controls.Styles  1.2
+import QtQuick.Dialogs          1.2
 
-
-import QGroundControl.FactSystem 1.0
-import QGroundControl.Palette 1.0
-import QGroundControl.Controls 1.0
+import QGroundControl.FactSystem    1.0
+import QGroundControl.Palette       1.0
+import QGroundControl.Controls      1.0
+import QGroundControl.ScreenTools   1.0
 
 QGCTextField {
     id: _textField
@@ -19,8 +19,10 @@ QGCTextField {
     property string _validateString
 
     // At this point all Facts are numeric
-    validator: DoubleValidator {}
-    inputMethodHints:   Qt.ImhFormattedNumbersOnly
+    validator:          DoubleValidator {}
+    inputMethodHints:   ScreenTools.isiOS ?
+                            Qt.ImhNone :                // iOS numeric keyboard has not done button, we can't use eit
+                            Qt.ImhFormattedNumbersOnly  // Forces use of virtual numeric keyboard
 
     onEditingFinished: {
         if (typeof qgcView !== 'undefined' && qgcView) {