Communication between javascript and Objective-c in iOS.

We wanted to have a communication between javascript and objective c code. We have already tried the below approach.
To load fake URLs in JS and append a string which will be used as parameter to the Objective-C code and parse that URL in this delegate method:
-(BOOL)webView(UIWebView *)webView shouldStartLoadWithRequest(NSURLRequest *)request navigationType(UIWebViewNavigationType)navigationType
Then send the return value by calling the native method stringByEvaluatingJavaScriptFromString again with parameter callID.
But we wanted to access Objective class object in Javascript code so that we can call it's methods from javascript code using this object.Android supports this behaviour using addJavaScriptInterface method in webview. Is it possible to have the similar approach in IOS? If not what is the best approach possible to acheive this? If we could achieve similar behaviour then we don't need to change the Jacascript code and will be reused. Please suggest the best possible solution.
Regards,
Karthik M.

https://developer.apple.com/library/mac/documentation/AppleApplications/Conceptu al/SafariJSProgTopics/Tasks/ObjCFromJavaScript.html

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  • COMMUNICATION BETWEEN JAVASCRIPT AND JAVA APPLET: US$20 AWARD FOR SOLUTION!

    COMMUNICATION BETWEEN JAVASCRIPT AND JAVA APPLET PROBLEM (Easy Filter Java Applet) -
    US$20 TO ANYONE WHO CAN RESOLVE THE PROBLEM
    To forum visitors:
    I am prepared to pay a standard shareware fee of US$20 to a user who can resolve this technical problem.
    If your advice resolves the problem, I'll forward the payment to your postal address (include your
    address with your reply, and also your email address)
    I am attempting to enable a HTML button (using Javascript's onClick command) to directly input a number into one of the parameter text boxes in the Easy Filter Java applet (ie, enter a new color value number in the text field of the standard Colors Multiplicator Filter interface).
    The applet is Freeware and can be downloaded at: http://www.javazoom.net/applets/easyfilter10/EasyFilter10.html
    (It is a very effective bitmap display and editing utility)
    To achieve this, I am trying to access the part of the applet that defines and sets the textbox. The text box is defined in the .class file by accessing the parameter details in the genericfilter.txt file (accompanies the .class files). I need to access 'private String appletInitialize()' and then one of the 'textFieldParameters' which sets the textbox.
    I understand the basic syntax for referencing the applet:
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    Please can you recommend the correct Javascript syntax to achieve communication with the applet.
    Thank you for your kind assistance.
    JM Graham
    [email protected]
    The Java source code for the applet: EasyFilter.class
    # Easy Filter - E.B/JavaZOOM 1999 #
    # Contact: [email protected] #
    # http://javazoom.hypermart.net #
    /* Originally compiled from EasyFilter.java */
    import java.awt.*;
    import java.io.*;
    import java.net.*;
    import java.applet.Applet;
    import java.awt.event.KeyEvent;
    import java.awt.event.KeyListener;
    import java.awt.image.MemoryImageSource;
    import java.awt.image.PixelGrabber;
    import java.util.Vector;
    public synchronized class EasyFilter extends Applet implements KeyListener
    private String paramFileName;
    private Color bgColor;
    private Color fgColor;
    private Color parColor;
    private Color sepColor;
    private Color titleColor;
    private Color helpColor;
    private int WinWidth;
    private int WinHeight;
    private String title;
    private String logoFileName;
    private String originalImageFileName;
    private String filteredCaption;
    private String originalCaption;
    private Vector paramsName;
    private Vector paramsValue;
    private Vector paramsComment;
    private Panel panelParameters[];
    private Label labelParameters[];
    private TextField textFieldParameters[];
    private Label labelComments[];
    private int nbParameters;
    private ScrollPane scrollPaneParams;
    private Panel panelParams;
    private Image theLogo;
    private Image theOriginalImage;
    private Image theFilteredImage;
    private int theOriginalPixelArray[];
    private int logoWidth;
    private int logoHeight;
    private int imageWidth;
    private int imageHeight;
    private drawCanvas canvasTitle;
    private Panel panelTitle;
    private Label labelTitle;
    private Panel panelImages;
    private Panel panelOriginalImage;
    private drawCanvas canvasOriginalImage;
    private Label labelOriginalImage;
    private Panel panelFilteredImage;
    private drawCanvas canvasFilteredImage;
    private Label labelFilteredImage;
    private Panel panelHelp;
    private Label labelHelp;
    private int Yspc;
    private FilterImplementation theFilter;
    public void init()
    String string = null;
    string = appletInitialize();
    setBackground(bgColor);
    if (string != null)
    removeAll();
    setBackground(Color.white);
    setForeground(Color.black);
    Label label = new Label(new StringBuffer("Error: ").append(string).toString(), 1);
    Panel panel = new Panel();
    panel.add(label);
    add(panel);
    setLayout(new FlowLayout(1, 5, Yspc));
    public void keyPressed(KeyEvent keyEvent)
    panelHelp.removeAll();
    boolean flag = true;
    if (KeyEvent.getKeyText(keyEvent.getKeyCode()).equals("Enter"))
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    try
    paramsValue.setElementAt(new Double(textFieldParameters.getText()), i);
    i++;
    catch (NumberFormatException e)
    labelHelp.setText(labelParameters[i].getText() + ": Not a Number");
    flag = false;
    break;
    if (flag == 1)
    labelHelp.setText(" .... Running, please wait .... ");
    labelHelp.setAlignment(1);
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    panelHelp.doLayout();
    theFilter.updateParameters(paramsValue);
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    else
    labelHelp.setText("- Press Enter to run the Filter -");
    labelHelp.setAlignment(1);
    panelHelp.add(labelHelp);
    panelHelp.doLayout();
    public void keyReleased(KeyEvent keyEvent)
    public void keyTyped(KeyEvent keyEvent)
    private String appletInitialize()
    WinWidth = size().width;
    WinHeight = size().height;
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    bgColor = new Color(0, 0, 40);
    else
    bgColor = new Color(Integer.parseInt(getParameter("bgcolor"), 16));
    if (getParameter("fgcolor") == null)
    fgColor = new Color(255, 255, 255);
    else
    fgColor = new Color(Integer.parseInt(getParameter("fgcolor"), 16));
    if (getParameter("sepcolor") == null)
    sepColor = new Color(158, 128, 128);
    else
    sepColor = new Color(Integer.parseInt(getParameter("sepcolor"), 16));
    if (getParameter("parcolor") == null)
    parColor = new Color(24, 24, 24);
    else
    parColor = new Color(Integer.parseInt(getParameter("parcolor"), 16));
    if (getParameter("titlecolor") == null)
    titleColor = new Color(255, 255, 0);
    else
    titleColor = new Color(Integer.parseInt(getParameter("titlecolor"), 16));
    if (getParameter("helpcolor") == null)
    helpColor = new Color(0, 255, 255);
    else
    helpColor = new Color(Integer.parseInt(getParameter("helpcolor"), 16));
    paramsName = new Vector();
    paramsValue = new Vector();
    paramsComment = new Vector();
    paramFileName = getParameter("paramfile");
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    if (string != null)
    return string;
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    mediaTracker.addImage(theOriginalImage, 0);
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    try
    mediaTracker.waitForAll();
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    return "Error while loading image";
    if (mediaTracker.isErrorAny())
    return "Error while loading image";
    if (logoFileName != null)
    logoWidth = theLogo.getWidth(this);
    logoHeight = theLogo.getHeight(this);
    imageWidth = theOriginalImage.getWidth(this);
    imageHeight = theOriginalImage.getHeight(this);
    theOriginalPixelArray = new int[imageWidth * imageHeight];
    PixelGrabber pixelGrabber = new PixelGrabber(theOriginalImage, 0, 0, imageWidth, imageHeight, theOriginalPixelArray, 0, imageWidth);
    try
    pixelGrabber.grabPixels();
    panelTitle = new Panel();
    canvasTitle = new drawCanvas();
    labelTitle = new Label();
    panelTitle.setLayout(new FlowLayout(1, 10, Yspc));
    add(panelTitle);
    panelTitle.setBackground(bgColor);
    panelTitle.add(canvasTitle);
    canvasTitle.setImage(theLogo);
    canvasTitle.setBounds(0, 0, logoWidth, logoHeight);
    labelTitle.setText(title);
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    return "Internal Error, Try RELOAD !";
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    panelTitle.add(labelTitle);
    labelTitle.setForeground(titleColor);
    labelTitle.setFont(new Font("Dialog", 1, 14));
    panelImages = new Panel();
    panelOriginalImage = new Panel();
    canvasOriginalImage = new drawCanvas();
    labelOriginalImage = new Label();
    panelFilteredImage = new Panel();
    canvasFilteredImage = new drawCanvas();
    labelFilteredImage = new Label();
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    panelOriginalImage.setLayout(new BorderLayout(0, 2));
    panelImages.add(panelOriginalImage);
    panelOriginalImage.setBackground(Color.black);
    panelOriginalImage.add("Center", canvasOriginalImage);
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    canvasOriginalImage.setBounds(0, 0, imageWidth, imageHeight);
    labelOriginalImage.setText(originalCaption);
    labelOriginalImage.setAlignment(1);
    panelOriginalImage.add("South", labelOriginalImage);
    labelOriginalImage.setBackground(Color.lightGray);
    labelOriginalImage.setForeground(Color.black);
    labelOriginalImage.setFont(new Font("SansSerif", 0, 10));
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    panelImages.add(panelFilteredImage);
    panelFilteredImage.setBackground(Color.black);
    panelFilteredImage.add("Center", canvasFilteredImage);
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    labelFilteredImage.setFont(new Font("SansSerif", 0, 10));
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    panelParams = new Panel();
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    panelParams.setLayout(new GridLayout(nbParameters, 1, 5, Yspc / 2));
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    panelParams.setBackground(sepColor);
    panelParameters = new Panel[nbParameters];
    labelParameters = new Label[nbParameters];
    textFieldParameters = new TextField[nbParameters];
    labelComments = new Label[nbParameters];
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    panelParameters[j] = new Panel();
    panelParameters[j].setLayout(new FlowLayout(0, 5, 1));
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    panelParameters[j].setBackground(parColor);
    labelParameters[j] = new Label();
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    panelParameters[j].add(labelParameters[j]);
    labelParameters[j].setForeground(fgColor);
    labelParameters[j].setFont(new Font("Dialog", 1, 12));
    textFieldParameters[j] = new TextField(8);
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    panelParameters[j].add(textFieldParameters[j]);
    textFieldParameters[j].setBackground(fgColor);
    textFieldParameters[j].addKeyListener(this);
    labelComments[j] = new Label();
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    panelParameters[j].add(labelComments[j]);
    labelComments[j].setForeground(fgColor);
    add(scrollPaneParams);
    panelHelp = new Panel();
    labelHelp = new Label();
    panelHelp.setLayout(new FlowLayout(1, 5, 0));
    add(panelHelp);
    panelHelp.setBackground(bgColor);
    labelHelp.setText(" Change colour values and press enter ");
    labelHelp.setAlignment(1);
    panelHelp.add(labelHelp);
    labelHelp.setForeground(helpColor);
    return null;
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    Object object1;
    String string2;
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    uRLConnection.setUseCaches(false);
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    return object1.getMessage();
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    return object1.getMessage();
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    finally
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    return null;
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    int j = string1.indexOf(" ", i);
    if (j == -1)
    return "Bad format error (space missing)";
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    return "Bad format (Double quote in TITLE missing)";
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    return "Bad format (Double quote in ORIGINALCAPTION missing)";
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    j = string1.indexOf(34, i);
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    j = string1.indexOf(34, i);
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    B  000 000 R/3              000000000 ACTIVE       NO  YES NO  000 255 255 20110831 154542 CRMSYS         
    M  db_connect o.k.
    M  ICT: exclude compression: .zip,.cs,.rar,.arj,.z,.gz,.tar,.lzh,.cab,.hqx,.ace,.jar,.ear,.war,.css,.pdf,.js,.gzip,.uue,.bz2,.iso,.sda,.sar,.gif

    I Wed Aug 31 15:46:12 2011
    I  MtxInit: 0 0 0
    M  SHM_PRES_BUF               (addr: 0A7C0040, size: 4400000)
    M  SHM_ROLL_AREA          (addr: 788A0040, size: 61440000)
    M  SHM_PAGING_AREA          (addr: 0AC00040, size: 32768000)
    M  SHM_ROLL_ADM               (addr: 0CB50040, size: 615040)
    M  SHM_PAGING_ADM          (addr: 0CBF0040, size: 525344)
    M  ThCreateNoBuffer          allocated 544152 bytes for 1000 entries at 0CC80040
    M  ThCreateNoBuffer          index size: 3000 elems
    M  ThCreateVBAdm          allocated 12160 bytes (50 server) at 0CD10040
    X  EmInit: MmSetImplementation( 2 ).
    X  MM diagnostic options set: 0
    X  <ES> client 0 initializing ....
    X  Using implementation flat
    X  ES initialized.
    B  db_con_shm_ini:  WP_ID = 0, WP_CNT = 13, CON_ID = -1
    B  dbtbxbuf: Buffer TABL  (addr: 10E700C8, size: 30000000, end: 12B0C448)
    B  dbtbxbuf: Buffer TABLP (addr: 12B100C8, size: 10240000, end: 134D40C8)
    B  dbexpbuf: Buffer EIBUF (addr: 0FBA00D0, size: 4194304, end: 0FFA00D0)
    B  dbexpbuf: Buffer ESM   (addr: 134E00D0, size: 4194304, end: 138E00D0)
    B  dbexpbuf: Buffer CUA   (addr: 138F00D0, size: 3072000, end: 13BDE0D0)
    B  dbexpbuf: Buffer OTR   (addr: 13BE00D0, size: 4194304, end: 13FE00D0)
    M  rdisp/reinitialize_code_page -> 0
    M  icm/accept_remote_trace_level -> 0
    M  rdisp/no_hooks_for_sqlbreak -> 0
    M  CCMS: AlInitGlobals : alert/use_sema_lock = TRUE.

    S Wed Aug 31 15:46:15 2011
    S  *** init spool environment
    S  initialize debug system
    T  Stack direction is downwards.
    T  debug control: prepare exclude for printer trace
    T  new memory block 1946AA80

    S Wed Aug 31 15:46:16 2011
    S  spool kernel/ddic check: Ok
    S  using table TSP02FX for frontend printing
    S  1 spool work process(es) found
    S  frontend print via spool service enabled
    S  printer list size is 150
    S  printer type list size is 50
    S  queue size (profile)   = 300
    S  hostspool list size = 3000
    S  option list size is 30
    S      found processing queue enabled
    S  found spool memory service RSPO-RCLOCKS at 1D6D00A8
    S  doing lock recovery
    S  setting server cache root
    S  found spool memory service RSPO-SERVERCACHE at 1D6D0430
    S    using messages for server info
    S  size of spec char cache entry: 297028 bytes (timeout 100 sec)
    S  size of open spool request entry: 2132 bytes
    S  immediate print option for implicitely closed spool requests is disabled

    A Wed Aug 31 15:46:18 2011

    A  -PXA--
    A  PXA INITIALIZATION
    A  PXA: Fragment Size too small: 73 MB, reducing # of fragments
    A  System page size: 4kb, total admin_size: 5132kb, dir_size: 5076kb.
    A  Attached to PXA (address 688A0040, size 150000K)
    A  abap/pxa = shared protect gen_remote
    A  PXA INITIALIZATION FINISHED
    A  -PXA--


    A Wed Aug 31 15:46:20 2011
    A  ABAP ShmAdm attached (addr=57A40000 leng=20955136 end=58E3C000)
    A  >> Shm MMADM area (addr=57EB5E58 leng=126176 end=57ED4B38)
    A  >> Shm MMDAT area (addr=57ED5000 leng=16150528 end=58E3C000)
    A  RFC Destination> destination crmsys_CUS_04 host crmsys system CUS systnr 4 (crmsys_CUS_04)

    A Wed Aug 31 15:46:21 2011
    A  RFC Options> H=crmsys,S=04,d=2,
    A  RFC FRFC> fallback activ but this is not a central instance.
    A   
    A  RFC rfc/signon_error_log = -1
    A  RFC rfc/dump_connection_info = 0
    A  RFC rfc/dump_client_info = 0
    A  RFC rfc/cp_convert/ignore_error = 1
    A  RFC rfc/cp_convert/conversion_char = 23
    A  RFC rfc/wan_compress/threshold = 251
    A  RFC rfc/recorder_pcs not set, use defaule value: 2
    A  RFC rfc/delta_trc_level not set, use default value: 0
    A  RFC rfc/no_uuid_check not set, use default value: 0
    A  RFC rfc/bc_ignore_thcmaccp_retcode not set, use default value: 0
    A  RFC Method> initialize RemObjDriver for ABAP Objects
    M  ThrCreateShObjects          allocated 13730 bytes at 0FFB0040

    N Wed Aug 31 15:46:22 2011
    N  SsfSapSecin: putenv(SECUDIR=D:\usr\sap\CUS\DVEBMGS04\sec): ok

    N  =================================================
    N  === SSF INITIALIZATION:
    N  ===...SSF Security Toolkit name SAPSECULIB .
    N  ===...SSF trace level is 0 .
    N  ===...SSF library is D:\usr\sap\CUS\DVEBMGS04\exe\sapsecu.dll .
    N  ===...SSF hash algorithm is SHA1 .
    N  ===...SSF symmetric encryption algorithm is DES-CBC .
    N  ===...sucessfully completed.
    N  =================================================

    N Wed Aug 31 15:46:23 2011
    N  MskiInitLogonTicketCacheHandle: Logon Ticket cache pointer retrieved from shared memory.
    N  MskiInitLogonTicketCacheHandle: Workprocess runs with Logon Ticket cache.
    M  JrfcVmcRegisterNativesDriver o.k.
    W  =================================================
    W  === ipl_Init() called
    B    dbtran INFO (init_connection '<DEFAULT>' [ORACLE:700.08]):
    B     max_blocking_factor =  15,  max_in_blocking_factor      =   5,
    B     min_blocking_factor =  10,  min_in_blocking_factor      =   5,
    B     prefer_union_all    =   0,  prefer_join                 =   0,
    B     prefer_fix_blocking =   0,  prefer_in_itab_opt          =   1,
    B     convert AVG         =   0,  alias table FUPD            =   0,
    B     escape_as_literal   =   1,  opt GE LE to BETWEEN        =   0,
    B     select *            =0x0f,  character encoding          = STD / <none>:-,
    B     use_hints           = abap->1, dbif->0x1, upto->2147483647, rule_in->0,
    B                           rule_fae->0, concat_fae->0, concat_fae_or->0

    W Wed Aug 31 15:46:24 2011
    W    ITS Plugin: Path dw_gui
    W    ITS Plugin: Description ITS Plugin - ITS rendering DLL
    W    ITS Plugin: sizeof(SAP_UC) 2
    W    ITS Plugin: Release: 700, [7000.0.52.20050900]
    W    ITS Plugin: Int.version, [32]
    W    ITS Plugin: Feature set: [10]
    W    ===... Calling itsp_Init in external dll ===>
    W  === ipl_Init() returns 0, ITSPE_OK: OK
    W  =================================================
    E  Enqueue Info: rdisp/wp_no_enq=1, rdisp/enqname=<empty>, assume crmsys_CUS_04
    E  Replication is disabled
    E  EnqCcInitialize: local lock table initialization o.k.
    E  EnqId_SuppressIpc: local EnqId initialization o.k.
    E  EnqCcInitialize: local enqueue client init o.k.

    B Wed Aug 31 15:46:48 2011
    B  table logging switched off for all clients

    M Wed Aug 31 15:47:55 2011
    M  SecAudit(RsauShmInit): WP attached to existing shared memory.
    M  SecAudit(RsauShmInit): addr of SCSA........... = 05BD0040
    M  SecAudit(RsauShmInit): addr of RSAUSHM........ = 05BD07A8
    M  SecAudit(RsauShmInit): addr of RSAUSLOTINFO... = 05BD07E0
    M  SecAudit(RsauShmInit): addr of RSAUSLOTS...... = 05BD07EC

    A Wed Aug 31 15:48:44 2011
    A  RFC FRFC> fallback on the central gateway crmsys sapgw04 activ

    B Wed Aug 31 15:49:47 2011
    B  dbmyclu : info : my major identification is 3232288873, minor one 4.
    B  dbmyclu : info : Time Reference is 1.12.2001 00:00:00h GMT.
    B  dbmyclu : info : my initial uuid is D98FA690E8AA314D9B69930868792664.
    B  dbmyclu : info : current optimistic cluster level: 0
    B  dbmyclu : info : pessimistic reads set to 2.

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    |    The current program had to be terminated because of an                                        |
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