判断用户是否禁止该App使用设备麦克风

#import <AVFoundation/AVAudioSession.h>

...

if ([[AVAudioSession sharedInstance] respondsToSelector:@selector(requestRecordPermission:)]) {

    [[AVAudioSession sharedInstance] performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {

        if (granted) {

            // Microphone enabled code

            NSLog(@"Microphone is enabled..");

        }

        else {

            // Microphone disabled code

            NSLog(@"Microphone is disabled..");

 

            // We're in a background thread here, so jump to main thread to do UI work.

            dispatch_async(dispatch_get_main_queue(), ^{

                [[[[UIAlertView alloc] initWithTitle:@"Microphone Access Denied"

                                        message:@"This app requires access to your device's Microphone. Please enable Microphone access for this app in Settings / Privacy / Microphone"

                                       delegate:nil

                              cancelButtonTitle:@"Dismiss"

                              otherButtonTitles:nil] autorelease] show];

            });

        }

    }];

}