App请求权限

Xcode中plist文件中需要配置：

//向用户询问授权
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
            if ([audioSession respondsToSelector:@selector(requestRecordPermission:)]) {
                [audioSession performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
                    // NSLog(@"%i",granted);
                    //  bCanRecord = granted;
                }];
            }
//另一种方式向用户询问授权
// Explicit user permission is required for media capture, but the user has not yet granted or denied such permission.
            [AVCaptureDevice requestAccessForMediaType:mediaType completionHandler:^(BOOL granted) {
                if(granted){//点击允许访问时调用
                    //用户明确许可与否，媒体需要捕获，但用户尚未授予或拒绝许可。
                    NSLog(@"Granted access to %@", mediaType);
                }
                else {
                    NSLog(@"Not granted access to %@", mediaType);
                }

            }];

int CanRecord(){
    int bCanRecord = -1;
    /*AVMediaTypeVideo//相机
      AVMediaTypeAudio//麦克风
    */
    //获取当前权限状态
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];
    switch (authStatus) {
        case AVAuthorizationStatusNotDetermined://尚未询问过用户是否授权
        {
            NSLog(@"AVAuthorizationStatusNotDetermined");  
        }
            break;
        case AVAuthorizationStatusDenied://不授权
            NSLog(@"AVAuthorizationStatusDenied");
            bCanRecord = 0;
            break;
        case AVAuthorizationStatusAuthorized://已授权
            NSLog(@"AVAuthorizationStatusAuthorized");
            bCanRecord = 1;
            break;
        case AVAuthorizationStatusRestricted://限制
            NSLog(@"AVAuthorizationStatusRestricted");
            bCanRecord = 0;
            break;
        default:
            NSLog(@"default");
            bCanRecord = 0;
            break;
    }

    return bCanRecord;
}