UIActionSheet的使用

var myActionSheet:UIActionSheet = UIActionSheet()

        var title : String? = "Select Source"
        myActionSheet.title  = title
            myActionSheet.delegate = self
        myActionSheet.addButtonWithTitle("camera")
        myActionSheet.addButtonWithTitle("Library")
        myActionSheet.addButtonWithTitle("Cancel")

        myActionSheet.cancelButtonIndex = 2 
        myActionSheet.showInView(self.view)

func actionSheet(myActionSheet: UIActionSheet!, clickedButtonAtIndex buttonIndex: Int){
        println("the index is %d", buttonIndex)
    }