internal/gamepaddb: enable mappings for iOS

Updates #1557
Closes #1722

internal/gamepaddb/gamepaddb.go

@@ -499,12 +499,6 @@ func Update(mapping []byte) (bool, error) {
 		return false, nil
 	}
 
-	// TODO: Implement this (#1722)
-	if currentPlatform == platformIOS {
-		// Note: NOT returning an error, as mappings also do not matter right now.
-		return false, nil
-	}
-
 	mappingsM.Lock()
 	defer mappingsM.Unlock()
 

internal/uidriver/mobile/gamepad_ios.go

@@ -452,6 +452,7 @@ func (i *Input) updateGamepads() {
 			Name:      string(name),
 			ButtonNum: int(property.nButtons),
 			AxisNum:   int(property.nAxes),
+			HatNum:    int(property.nHats),
 		}
 
 		var state C.struct_ControllerState
@@ -476,6 +477,10 @@ func (i *Input) updateGamepads() {
 			gamepad.Axes[j] = float32(state.axes[j])
 		}
 
+		if gamepad.HatNum > 0 {
+			gamepad.Hats[0] = int(state.hat)
+		}
+
 		i.gamepads = append(i.gamepads, gamepad)
 	}
 }