// 使用
self.cameraPermissions(authorizedBlock: {
 print("打开相机")
}, deniedBlock: {
 print("没有权限使用相机")
})

// 相机权限
class func cameraPermissions(authorizedBlock: OperationBlock?, deniedBlock: OperationBlock?) {
 let authStatus = AVCaptureDevice.authorizationStatus(for: AVMediaType.video)
 
 // .notDetermined .authorized .restricted .denied
 if authStatus == .notDetermined {
  // 第一次触发授权 alert
  AVCaptureDevice.requestAccess(for: .video, completionHandler: { (granted: Bool) in
   self.cameraPermissions(authorizedBlock: authorizedBlock, deniedBlock: deniedBlock)
  })
 } else if authStatus == .authorized {
  if authorizedBlock != nil {
   authorizedBlock!()
  }
 } else {
  if deniedBlock != nil {
   deniedBlock!()
  }
 }
}

// 使用
self.photoAlbumPermissions(authorizedBlock: {
 print("打开相册")
}, deniedBlock: {
 print("没有权限打开相册")
})

// 相册权限
class func photoAlbumPermissions(authorizedBlock: OperationBlock?, deniedBlock: OperationBlock?) {
 let authStatus = PHPhotoLibrary.authorizationStatus()
 
 // .notDetermined .authorized .restricted .denied
 if authStatus == .notDetermined {
  // 第一次触发授权 alert
  PHPhotoLibrary.requestAuthorization { (status:PHAuthorizationStatus) -> Void in
   self.photoAlbumPermissions(authorizedBlock: authorizedBlock, deniedBlock: deniedBlock)
  }
 } else if authStatus == .authorized {
  if authorizedBlock != nil {
   authorizedBlock!()
  }
 } else {
  if deniedBlock != nil {
   deniedBlock!()
  }
 }
}