UIWebView: HTML5 audio pauses in iOS 6 when app enters background

Starting with iOS 6, you MUST set the audio session category to ‘playback’ before creating the UIWebView. This is all you have to do. It is not necessary to make the session active.

This should be used for html video as well, because if you don’t configure the session, your video will be muted when the ringer switch is off.

#import <AVFoundation/AVFoundation.h>

AVAudioSession *audioSession = [AVAudioSession sharedInstance];
BOOL ok;
NSError *setCategoryError = nil;
ok = [audioSession setCategory:AVAudioSessionCategoryPlayback
                         error:&setCategoryError];
if (!ok) {
  NSLog(@"%s setCategoryError=%@", __PRETTY_FUNCTION__, setCategoryError);
}

Ensure that your target links to the AVFoundation framework.

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If using Cordova, the file you need to modify is platforms/ios/MyApp/Classes/AppDelegate.m, and will end up looking like this:

#import "AppDelegate.h"
#import "MainViewController.h"
#import <AVFoundation/AVFoundation.h>

@implementation AppDelegate

- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    BOOL ok;
    NSError *setCategoryError = nil;
    ok = [audioSession setCategory:AVAudioSessionCategoryPlayback error:&setCategoryError];
    if (!ok) {
        NSLog(@"%s setCategoryError=%@", __PRETTY_FUNCTION__, setCategoryError);
    }

    self.viewController = [[MainViewController alloc] init];
    return [super application:application didFinishLaunchingWithOptions:launchOptions];
}

@end

Also, as mentioned in the comments, you need to link the AVFoundation Framework, as explained in this answer:

• Open your project with xcode open ./platforms/ios/MyApp.xcworkspace/
• Project navigator > target My App > General
• Scroll to the bottom to find Linked Frameworks and Libraries