How to drag a scrollView with TouchPhase.Moved?

Hello, all together!

I have now spent two days with trying to make a simple scroll view draggable on the iPhone/iPad. I don't want to use scrollbars. I want to drag the content by swiping over it. For this I tried to use "TouchPhase.Moved" but unfortunately I obviously don't understand how to make it work as simple as possible. Can You help me, please?

This is the java code for the ScrollView:

//////////////////////////////////////////////////////////

var ContentImage : Texture2D;

public var scrollBoxWidth = 280; public var scrollBoxHeight = 120;

var scrollPosition : Vector2 = Vector2.zero; var style : GUIStyle;

private var textStyle : GUIStyle = new GUIStyle();

function OnGUI () {

 GUILayout.BeginArea(new Rect(Screen.width * 0.5 - scrollBoxWidth / 2, Screen.height-205, scrollBoxWidth, scrollBoxHeight));
 GUI.skin.scrollView = style;
   
 scrollPosition = GUILayout.BeginScrollView (scrollPosition, GUILayout.Width(scrollBoxWidth), GUILayout.Height(scrollBoxHeight));

    GUILayout.Label(ContentImage);

 GUILayout.EndScrollView ();
 GUILayout.EndArea();

}

////////////////////////////////////////////////////////////////