ios 打开扬声器

    [[UIDevice currentDevice] setProximityMonitoringEnabled:YES];

    AVAudioSession *audioSession = [AVAudioSession sharedInstance];

    //默认情况下扬声器播放

    [audioSession setCategory:AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error:nil];

    [audioSession setActive:YES error:nil];

ios 打开扬声器

原文：http://www.cnblogs.com/liaolijun/p/6898473.html