NativeScript
diff --git a/apps/tsconfig.json b/apps/tsconfig.json
@@ -8,7 +8,8 @@
         "noImplicitAny": false,
         "noImplicitUseStrict": true,
         "experimentalDecorators": true,
-        "diagnostics": true
+        "diagnostics": true,
+        "sourceMap": true
     },
     "exclude": [
         "node_modules",

diff --git a/tests/app/file-system-tests.ts b/tests/app/file-system-tests.ts
@@ -218,6 +218,40 @@ export var testGetKnownFolders = function () {
     // << file-system-known-folders
 };
 
+function _testIOSSpecificKnownFolder(knownFolderName: string){
+    let knownFolder: fs.Folder;
+    let createdFile: fs.File;
+    let testFunc = function testFunc(){
+        knownFolder = fs.knownFolders.ios[knownFolderName]();
+        createdFile = knownFolder.getFile("createdFile");
+        createdFile.writeTextSync("some text");
+    };
+    if (platform.isIOS){
+        testFunc();
+        TKUnit.assertNotNull(knownFolder, `Could not retrieve the ${knownFolderName} known folder.`);
+        TKUnit.assertTrue(knownFolder.isKnown, `The ${knownFolderName} folder should have its "isKnown" property set to true.`);
+        TKUnit.assertNotNull(createdFile, `Could not create a new file in the ${knownFolderName} known folder.`);
+        TKUnit.assertTrue(fs.File.exists(createdFile.path), `Could not create a new file in the ${knownFolderName} known folder.`);
+        TKUnit.assertEqual(createdFile.readTextSync(), "some text", `The contents of the new file created in the ${knownFolderName} known folder are not as expected.`);
+    }
+    else {
+        TKUnit.assertThrows(testFunc, 
+        `Trying to retrieve the ${knownFolderName} known folder on a platform different from iOS should throw!`,
+        `The "${knownFolderName}" known folder is available on iOS only!`);
+    }
+}
+
+export var testIOSSpecificKnownFolders = function () {
+    _testIOSSpecificKnownFolder("library");    
+    _testIOSSpecificKnownFolder("developer");    
+    _testIOSSpecificKnownFolder("desktop");    
+    _testIOSSpecificKnownFolder("downloads");    
+    _testIOSSpecificKnownFolder("movies");    
+    _testIOSSpecificKnownFolder("music");    
+    _testIOSSpecificKnownFolder("pictures");    
+    _testIOSSpecificKnownFolder("sharedPublic");    
+}
+
 export var testGetEntities = function () {
     // >> file-system-folders-content
     var documents = fs.knownFolders.documents();

diff --git a/tests/tsconfig.json b/tests/tsconfig.json
@@ -8,7 +8,8 @@
         "noImplicitAny": false,
         "noImplicitUseStrict": true,
         "experimentalDecorators": true,
-        "diagnostics": true
+        "diagnostics": true,
+        "sourceMap": true
     },
     "exclude": [
         "node_modules",

diff --git a/tns-core-modules/file-system/file-system-access.ios.ts b/tns-core-modules/file-system/file-system-access.ios.ts
@@ -3,22 +3,14 @@ import * as utilsModule from "utils/utils";
 
 // TODO: Implement all the APIs receiving callback using async blocks
 // TODO: Check whether we need try/catch blocks for the iOS implementation
-
 export class FileSystemAccess {
-    //private keyFileType = "NSFileType";
-    //private keyReadonly = "NSFileImmutable";
-    //private NSUTF8StringEncoding = 4;
-    private keyModificationTime = "NSFileModificationDate";
-    private documentDir = 9;
-    private cachesDir = 13;
-    private userDomain = 1;
 
     public getLastModified(path: string): Date {
         var fileManager = NSFileManager.defaultManager();
         var attributes = fileManager.attributesOfItemAtPathError(path);
 
         if (attributes) {
-            return attributes.objectForKey(this.keyModificationTime);
+            return attributes.objectForKey("NSFileModificationDate");
         } else {
             return new Date();
         }
@@ -226,11 +218,11 @@ export class FileSystemAccess {
     }
 
     public getDocumentsFolderPath(): string {
-        return this.getKnownPath(this.documentDir);
+        return this.getKnownPath(NSSearchPathDirectory.NSDocumentDirectory);
     }
 
     public getTempFolderPath(): string {
-        return this.getKnownPath(this.cachesDir);
+        return this.getKnownPath(NSSearchPathDirectory.NSCachesDirectory);
     }
 
     public getCurrentAppPath(): string {
@@ -307,7 +299,7 @@ export class FileSystemAccess {
 
     private getKnownPath(folderType: number): string {
         var fileManager = NSFileManager.defaultManager();
-        var paths = fileManager.URLsForDirectoryInDomains(folderType, this.userDomain);
+        var paths = fileManager.URLsForDirectoryInDomains(folderType, NSSearchPathDirectory.NSApplicationDirectory);
 
         var url = paths.objectAtIndex(0);
         return url.path;

diff --git a/tns-core-modules/file-system/file-system.d.ts b/tns-core-modules/file-system/file-system.d.ts
@@ -208,6 +208,51 @@ declare module "file-system" {
          * iOS - this folder is read-only and contains the app and all its resources.
          */
         export function currentApp(): Folder;
+
+        /**
+         * Contains iOS-specific known folders.
+         */
+        module ios {
+            /**
+             * Gets the NSLibraryDirectory.
+             */
+            export function library(): Folder;
+
+            /**
+             * Gets the NSDeveloperDirectory.
+             */
+            export function developer(): Folder;
+
+            /**
+             * Gets the NSDesktopDirectory.
+             */
+            export function desktop(): Folder;
+
+            /**
+             * Gets the NSDownloadsDirectory.
+             */
+            export function downloads(): Folder;
+
+            /**
+             * Gets the NSMoviesDirectory.
+             */
+            export function movies(): Folder;
+
+            /**
+             * Gets the NSMusicDirectory.
+             */
+            export function music(): Folder;
+
+            /**
+             * Gets the NSPicturesDirectory.
+             */
+            export function pictures(): Folder;
+
+            /**
+             * Gets the NSSharedPublicDirectory.
+             */
+            export function sharedPublic(): Folder;
+        } 
     }
 
     /**

diff --git a/tns-core-modules/file-system/file-system.ts b/tns-core-modules/file-system/file-system.ts
@@ -1,4 +1,5 @@
 import file_access_module = require("file-system/file-system-access");
+import * as platformModule from "platform";
 
 // The FileSystemAccess implementation, used through all the APIs.
 var fileAccess;
@@ -10,6 +11,13 @@ var getFileAccess = function (): file_access_module.FileSystemAccess {
     return fileAccess;
 };
 
+let platform: typeof platformModule;
+function ensurePlatform() {
+    if (!platform) {
+        platform = require("platform");
+    }
+}
+
 // we are defining these as private variables within the IO scope and will use them to access the corresponding properties for each FSEntity instance.
 // this allows us to encapsulate (hide) the explicit property setters and force the users go through the exposed APIs to receive FSEntity instances.
 var nameProperty = "_name";
@@ -491,6 +499,119 @@ export module knownFolders {
 
         return _app;
     };
+
+    export module ios {
+        function _checkPlatform(knownFolderName: string){
+            ensurePlatform();
+            if (!platform.isIOS){
+                throw new Error(`The "${knownFolderName}" known folder is available on iOS only!`);
+            }            
+        }
+
+        let _library: Folder;
+        export var library = function(): Folder {
+            _checkPlatform("library");
+            if (!_library) {
+                var path = (<any>getFileAccess()).getKnownPath(NSSearchPathDirectory.NSLibraryDirectory);
+                _library = Folder.fromPath(path);
+                _library[pathProperty] = path;
+                _library[isKnownProperty] = true;
+            }
+
+            return _library;
+        };
+
+        let _developer: Folder;
+        export var developer = function(): Folder {
+            _checkPlatform("developer");
+            if (!_developer) {
+                var path = (<any>getFileAccess()).getKnownPath(NSSearchPathDirectory.NSDeveloperDirectory);
+                _developer = Folder.fromPath(path);
+                _developer[pathProperty] = path;
+                _developer[isKnownProperty] = true;
+            }
+
+            return _developer;
+        };
+
+        let _desktop: Folder;
+        export var desktop = function(): Folder {
+            _checkPlatform("desktop");
+            if (!_desktop) {
+                var path = (<any>getFileAccess()).getKnownPath(NSSearchPathDirectory.NSDesktopDirectory);
+                _desktop = Folder.fromPath(path);
+                _desktop[pathProperty] = path;
+                _desktop[isKnownProperty] = true;
+            }
+
+            return _desktop;
+        };
+
+        let _downloads: Folder;
+        export var downloads = function(): Folder {
+            _checkPlatform("downloads");
+            if (!_downloads) {
+                var path = (<any>getFileAccess()).getKnownPath(NSSearchPathDirectory.NSDownloadsDirectory);
+                _downloads = Folder.fromPath(path);
+                _downloads[pathProperty] = path;
+                _downloads[isKnownProperty] = true;
+            }
+
+            return _downloads;
+        };
+
+        let _movies: Folder;
+        export var movies = function(): Folder {
+            _checkPlatform("movies");
+            if (!_movies) {
+                var path = (<any>getFileAccess()).getKnownPath(NSSearchPathDirectory.NSMoviesDirectory);
+                _movies = Folder.fromPath(path);
+                _movies[pathProperty] = path;
+                _movies[isKnownProperty] = true;
+            }
+
+            return _movies;
+        };
+
+        let _music: Folder;
+        export var music = function(): Folder {
+            _checkPlatform("music");
+            if (!_music) {
+                var path = (<any>getFileAccess()).getKnownPath(NSSearchPathDirectory.NSMusicDirectory);
+                _music = Folder.fromPath(path);
+                _music[pathProperty] = path;
+                _music[isKnownProperty] = true;
+            }
+
+            return _music;
+        };
+
+        let _pictures: Folder;
+        export var pictures = function(): Folder {
+            _checkPlatform("pictures");
+            if (!_pictures) {
+                var path = (<any>getFileAccess()).getKnownPath(NSSearchPathDirectory.NSPicturesDirectory);
+                _pictures = Folder.fromPath(path);
+                _pictures[pathProperty] = path;
+                _pictures[isKnownProperty] = true;
+            }
+
+            return _pictures;
+        };
+
+        let _sharedPublic: Folder;
+        export var sharedPublic = function(): Folder {
+            _checkPlatform("sharedPublic");
+            if (!_sharedPublic) {
+                var path = (<any>getFileAccess()).getKnownPath(NSSearchPathDirectory.NSSharedPublicDirectory);
+                _sharedPublic = Folder.fromPath(path);
+                _sharedPublic[pathProperty] = path;
+                _sharedPublic[isKnownProperty] = true;
+            }
+
+            return _sharedPublic;
+        };
+    }
 }
 
 export module path {

diff --git a/tsconfig.json b/tsconfig.json
@@ -9,7 +9,8 @@
         "noImplicitAny": false,
         "noImplicitUseStrict": true,
         "experimentalDecorators": true,
-        "diagnostics": true
+        "diagnostics": true,
+        "sourceMap": true
     },
     "exclude": [
         "node_modules",