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/* ***** BEGIN LICENSE BLOCK *****
# Copyright 2010 Alexandre Poirot
# Contributor(s):
# Alexandre poirot <>
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <>.
# ***** END LICENSE BLOCK *****/
#import "MyWebView.h"
@implementation MyWebView
- (id)initWithFrame:(CGRect)frame
if (self = [super initWithFrame:frame]) {
// Set delegate in order to "shouldStartLoadWithRequest" to be called
self.delegate = self;
// Set non-opaque in order to make "body{background-color:transparent}" working!
self.opaque = NO;
// Instanciate JSON parser library
json = [ SBJSON new ];
// load our html file
NSString *path = [[NSBundle mainBundle] pathForResource:@"webview-document" ofType:@"html"];
[self loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:path]]];
return self;
// This selector is called when something is loaded in our webview
// By something I don't mean anything but just "some" :
// - main html document
// - sub iframes document
// But all images, xmlhttprequest, css, ... files/requests doesn't generate such events :/
- (BOOL)webView:(UIWebView *)webView2
shouldStartLoadWithRequest:(NSURLRequest *)request
navigationType:(UIWebViewNavigationType)navigationType {
NSString *requestString = [[request URL] absoluteString];
//NSLog(@"request : %@",requestString);
if ([requestString hasPrefix:@"js-frame:"]) {
NSArray *components = [requestString componentsSeparatedByString:@":"];
NSString *function = (NSString*)[components objectAtIndex:1];
int callbackId = [((NSString*)[components objectAtIndex:2]) intValue];
NSString *argsAsString = [(NSString*)[components objectAtIndex:3]
NSArray *args = (NSArray*)[json objectWithString:argsAsString error:nil];
[self handleCall:function callbackId:callbackId args:args];
return NO;
return YES;
// Call this function when you have results to send back to javascript callbacks
// callbackId : int comes from handleCall function
// args: list of objects to send to the javascript callback
- (void)returnResult:(int)callbackId args:(id)arg, ...;
va_list argsList;
NSMutableArray *resultArray = [[NSMutableArray alloc] init];
if(arg != nil){
[resultArray addObject:arg];
va_start(argsList, arg);
while((arg = va_arg(argsList, id)) != nil)
[resultArray addObject:arg];
NSString *resultArrayString = [json stringWithObject:resultArray allowScalar:YES error:nil];
[self stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:@"NativeBridge.resultForCallback(%d,%@);",callbackId,resultArrayString]];
// Implements all you native function in this one, by matching 'functionName' and parsing 'args'
// Use 'callbackId' with 'returnResult' selector when you get some results to send back to javascript
- (void)handleCall:(NSString*)functionName callbackId:(int)callbackId args:(NSArray*)args
if ([functionName isEqualToString:@"setBackgroundColor"]) {
if ([args count]!=3) {
NSLog(@"setBackgroundColor wait exactly 3 arguments!");
NSNumber *red = (NSNumber*)[args objectAtIndex:0];
NSNumber *green = (NSNumber*)[args objectAtIndex:1];
NSNumber *blue = (NSNumber*)[args objectAtIndex:2];
self.backgroundColor = [UIColor colorWithRed:[red floatValue] green:[green floatValue] blue:[blue floatValue] alpha:1.0];
[self returnResult:callbackId args:nil];
} else if ([functionName isEqualToString:@"prompt"]) {
if ([args count]!=1) {
NSLog(@"prompt wait exactly one argument!");
NSString *message = (NSString*)[args objectAtIndex:0];
alertCallbackId = callbackId;
UIAlertView *alert=[[[UIAlertView alloc] initWithTitle:nil message:message delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil] autorelease];
[alert show];
} else {
NSLog(@"Unimplemented method '%@'",functionName);
// Just one example with AlertView that show how to return asynchronous results
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
if (!alertCallbackId) return;
NSLog(@"prompt result : %d",buttonIndex);
BOOL result = buttonIndex==1?YES:NO;
[self returnResult:alertCallbackId args:[NSNumber numberWithBool:result],nil];
alertCallbackId = nil;