系统相册

 AVAuthorizationStatus state = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo]; ／／获取相机的访问权限

四种枚举 值。

AVAuthorizationStatusNotDetermined = 0,

AVAuthorizationStatusRestricted,

AVAuthorizationStatusDenied,

AVAuthorizationStatusAuthorized

 ALAuthorizationStatus state = [ALAssetsLibrary authorizationStatus]; 获取相册的访问权限

  ALAuthorizationStatusNotDetermined = 0, // User has not yet made a choice with regards to this application

    ALAuthorizationStatusRestricted,        // This application is not authorized to access photo data.

                                            // The user cannot change this application’s status, possibly due to active restrictions

                                            //  such as parental controls being in place.

    ALAuthorizationStatusDenied,            // User has explicitly denied this application access to photos data.

    ALAuthorizationStatusAuthorized         // User has authorized this application to access photos data.