Inheritance: PBXObject
        public bool AddBuildFile( PBXBuildFile file )
        {
            if( !ContainsKey( FILES_KEY ) ){
                this.Add( FILES_KEY, new PBXList() );
            }
            ((PBXList)_data[ FILES_KEY ]).Add( file.guid );

            return true;
        }
        public PBXDictionary AddFile( string filePath, PBXGroup parent = null, string tree = "SOURCE_ROOT", bool createBuildFiles = true, bool weak = false )
        {
            PBXDictionary results = new PBXDictionary();
            string absPath = string.Empty;

            if( Path.IsPathRooted( filePath ) ) {
                absPath = filePath;
            }
            else if( tree.CompareTo( "SDKROOT" ) != 0) {
                absPath = Path.Combine( Application.dataPath, filePath );
            }

            if( tree.CompareTo( "SOURCE_ROOT" ) == 0 ) {
                System.Uri fileURI = new System.Uri( absPath );
                System.Uri rootURI = new System.Uri( ( projectRootPath + "/." ) );
                filePath = rootURI.MakeRelativeUri( fileURI ).ToString();
            }

            if( parent == null ) {
                parent = _rootGroup;
            }

            // TODO: Aggiungere controllo se file già presente
            PBXFileReference fileReference = GetFile( System.IO.Path.GetFileName( filePath ) );
            if( fileReference != null ) {
                return null;
            }

            fileReference = new PBXFileReference( filePath, (TreeEnum)System.Enum.Parse( typeof(TreeEnum), tree ) );
            parent.AddChild( fileReference );
            fileReferences.Add( fileReference );
            results.Add( fileReference.guid, fileReference );

            //Create a build file for reference
            if( !string.IsNullOrEmpty( fileReference.buildPhase ) && createBuildFiles ) {
                PBXBuildFile buildFile;
                switch( fileReference.buildPhase ) {
                    case "PBXFrameworksBuildPhase":
                        foreach( KeyValuePair<string, PBXFrameworksBuildPhase> currentObject in frameworkBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }
                        if ( !string.IsNullOrEmpty( absPath ) && ( tree.CompareTo( "SOURCE_ROOT" ) == 0 ) && File.Exists( absPath ) ) {
                            string libraryPath = Path.Combine( "$(SRCROOT)", Path.GetDirectoryName( filePath ) );
                            this.AddLibrarySearchPaths( new PBXList( libraryPath ) );
                        }
                        break;
                    case "PBXResourcesBuildPhase":
                        foreach( KeyValuePair<string, PBXResourcesBuildPhase> currentObject in resourcesBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }
                        break;
                    case "PBXShellScriptBuildPhase":
                        foreach( KeyValuePair<string, PBXShellScriptBuildPhase> currentObject in shellScriptBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }
                        break;
                    case "PBXSourcesBuildPhase":
                        foreach( KeyValuePair<string, PBXSourcesBuildPhase> currentObject in sourcesBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }
                        break;
                    case "PBXCopyFilesBuildPhase":
                        foreach( KeyValuePair<string, PBXCopyFilesBuildPhase> currentObject in copyBuildPhases ) {
                            buildFile = new PBXBuildFile( fileReference, weak );
                            buildFiles.Add( buildFile );
                            currentObject.Value.AddBuildFile( buildFile );
                        }
                        break;
                    case null:
                        Debug.LogWarning( "fase non supportata null" );
                        break;
                    default:
                        Debug.LogWarning( "fase non supportata def" );
                        return null;
                }
            }

            return results;
        }