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

@@ -3,10 +3,10 @@ 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.ScreenTools   1.0
 
 QGCTextField {
     id: _textField
@@ -20,7 +20,9 @@ QGCTextField {
 
     // At this point all Facts are numeric
     validator:          DoubleValidator {}
-    inputMethodHints:   Qt.ImhFormattedNumbersOnly
+    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) {