Ios authorizationStatus（）关于MPMediaLibrary访问

我想访问媒体库以显示歌曲列表。因此，我正在检查媒体库的授权状态。当我们在权限警报中选择“不允许”时，获得的授权状态为

.Denied

，但应用程序可以获取媒体项目。如果没有媒体权限，我们也可以访问库吗？如果是，代码级别的媒体权限需要什么？下面是代码

func checkMediaLibraryPermissions() {
    if #available(iOS 9.3, *) {
        func requestAuthorization() {
            MPMediaLibrary.requestAuthorization { (status) in
                switch status {
                case .Authorized:
                // Go for the further actions
                case .NotDetermined: break // We are already request the authorization above
                case .Denied,
                .Restricted:
                    let qrySongs = MPMediaQuery.songsQuery()
                    debugPrint(qrySongs.count)

                    // Require to show the alert about the permission enable
                }
            }
        }

        let authorizeStatus = MPMediaLibrary.authorizationStatus()
        switch authorizeStatus {
        case .Authorized:
            // Go for the further actions               
        case .NotDetermined:
            requestAuthorization()
        case .Restricted,
             .Denied:
            let qrySongs = MPMediaQuery.songsQuery()
            debugPrint(qrySongs.count)

            // Require to show the alert about the permission enable
        }
    }
}