Changes

By default, views are configured to respond to only single touches (in other words a single finger touching or tapping the screen at any one time). For the purposes of this example we plan to detect multiple touches. In order to enable this support it is necessary to change an attribute of the view object. To achieve this, click on the background of the View window, display the Attribute Inspector (''View -> Utilities -> Attribute Inspector'') and make sure that the Multiple Touch option is selection in the Interaction section at the bottom of the window:

[[Image:xcode_4_enable_multitouch.jpg|Enabling multitouch in a view in Xcode 4]]

== Implementing the touchesBegan Method ==