swift 相机，相册，麦克风，位置权限设置

开发App过程中我们会遇到关于相机，位置等权限设置的问题，下面来讲一下关于这些权限的设置以及如何获取权限状态

一. 相机，相册
1.首先在info.plist文件中添加两个key NSCameraUsageDescription与NSPhotoLibraryUsageDescription，如下图所示：

image.png

2.调起相机相册使用权限

//打开相机权限
    func openCamera() {
            let authStatus = AVCaptureDevice.authorizationStatus(for: .video)
            if authStatus == .notDetermined {
                AVCaptureDevice.requestAccess(for: .video) { (res) in
                    //此处可以判断权限状态来做出相应的操作，如改变按钮状态
                    if res{
                        DispatchQueue.main.async {
                            self.cameraBtn .setImage(UIImage(named: "turn on"), for: UIControl.State.normal)
                        }
                    }else{
                        DispatchQueue.main.async {
                            self.cameraBtn .setImage(UIImage(named: "turn off"), for: UIControl.State.normal)
                        }
                    }
                }
            }
        }

//开启相册权限
    func openAlbum() {
        let authStatus = PHPhotoLibrary.authorizationStatus()
        if authStatus == .notDetermined {
            PHPhotoLibrary.requestAuthorization({ (status) in
                //此处可以判断权限状态来做出相应的操作，如改变按钮状态
                if status == .authorized {
                
                    DispatchQueue.main.async {
                        self.albumBtn .setImage(UIImage(named: "turn on"), for: UIControl.State.normal)
                    }
                } else if status == .denied || status == .restricted{
                    DispatchQueue.main.async {
                        self.albumBtn .setImage(UIImage(named: "turn off"), for: UIControl.State.normal)
                    }
                }
            })
        }
    }

3.在需要判断目前相机相册是否是开启状态时，代码如下：

//是否开启相机权限
    func IsOpenCamera() -> Bool{
        let authStatus = AVCaptureDevice.authorizationStatus(for: .video)
        return authStatus != .restricted && authStatus != .denied
    }

//是否开启相册权限
    func IsOpenAlbum() -> Bool{
        let authStatus = PHPhotoLibrary.authorizationStatus()
        return authStatus != .restricted && authStatus != .denied
    }

二.麦克风
1.开启麦克风需在info.plist加入key NSMicrophoneUsageDescription

image.png

2.调起麦克风使用权限

//开启麦克风权限
    func openAudioSession() {
        let permissionStatus = AVAudioSession.sharedInstance().recordPermission
        if permissionStatus == AVAudioSession.RecordPermission.undetermined {
            AVAudioSession.sharedInstance().requestRecordPermission { (granted) in
                //此处可以判断权限状态来做出相应的操作，如改变按钮状态
                if granted{
                    DispatchQueue.main.async {
                        self.microphoneBtn .setImage(UIImage(named: "turn on"), for: UIControl.State.normal)
                    }
                }else{
                    DispatchQueue.main.async {
                        self.microphoneBtn .setImage(UIImage(named: "turn off"), for: UIControl.State.normal)
                    }
                }
            }
        }
    }

3.在需要判断目前麦克风是否是开启状态时，代码如下：

//是否开启麦克风
    func IsOpenAudioSession() -> Bool{
        let authStatus = AVCaptureDevice.authorizationStatus(for: AVMediaType.audio)
        return authStatus != .restricted && authStatus != .denied
    }

三.位置
1.位置权限相对比较特殊，需要在info.plist文件中加入三个key，分别是NSLocationAlwaysAndWhenInUseUsageDescription，NSLocationWhenInUseUsageDescription和
NSLocationUsageDescription 如下图：

image.png

2.调用位置权限

//位置请求
let locationManager:CLLocationManager?
locationManager = CLLocationManager.init()
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
locationManager.requestAlwaysAuthorization()
locationManager.startUpdatingLocation()

如上代码可以调用起系统的位置权限弹窗，位置权限状态改变时系统会调用它的代理方法：

//位置权限状态发生变化调用此方法
    func locationManager(_ manager: CLLocationManager,
                          didChangeAuthorization status: CLAuthorizationStatus) {
       switch status {
          case .restricted, .denied:
            locationBtn .setImage(UIImage(named: "turn off"), for: UIControl.State.normal)
             break
                
          case .authorizedWhenInUse:
            locationBtn .setImage(UIImage(named: "turn on"), for: UIControl.State.normal)
             break
                      
          case .authorizedAlways:
            locationBtn .setImage(UIImage(named: "turn on"), for: UIControl.State.normal)
             break
          case .notDetermined:
            locationBtn .setImage(UIImage(named: "turn off"), for: UIControl.State.normal)
          break
        
       @unknown default:
             break
       }
    }

3.在需要判断目前位置权限是否是开启状态时，代码如下：

//是否开启定位权限
    func IsOpenLocation() -> Bool{
        let authStatus = CLLocationManager.authorizationStatus()
        return authStatus != .restricted && authStatus != .denied
    }

以上就是对使用系统相机，相册，麦克风，位置权限使用的总结，如有问题，请指教！