将地理位置数据保存到照片库Swift 3
如何使用地理定位元数据将照片保存到照片库?
我已请求(并允许)该应用访问用户位置:
private func allowAccessToUserLocation() { locationManager = CLLocationManager() locationManager.delegate = self locationManager.requestWhenInUseAuthorization() }
我是否需要询问相机应用程序的具体预设?
编辑:
我使用UIImagePickerController从应用程序中拍摄照片。 从应用程序中拍摄的所有照片都存储在照片库中,没有地理位置。
这与我将图像保存到照片库的方式有什么关系吗? 我的问题在这里而不是在核心位置权限?
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) { if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage{ UIImageWriteToSavedPhotosAlbum(pickedImage, self, #selector(image(_:didFinishSavingWithError:contextInfo:)), nil) dismiss(animated: true, completion: { self.showPhoto()}) } }
在iOS 8中,Apple推出了Photo Library 。
以下是使用location创建和更新PHAsset
的示例:
func addAsset(image: UIImage, location: CLLocation? = nil) { PHPhotoLibrary.shared().performChanges({ // Request creating an asset from the image. let creationRequest = PHAssetChangeRequest.creationRequestForAsset(from: image) // Set metadata location if let location = location { creationRequest.location = location } }, completionHandler: { success, error in if !success { NSLog("error creating asset: \(error)") } }) }
在保存之前,请确保您有权访问照片
PHPhotoLibrary.requestAuthorization(_:)
可以使用以下内容读取元数据:
info[UIImagePickerControllerMediaMetadata]
我无法在我的测试中validation元数据存储位置,即使在允许位置服务的情况下也是如此。 在这种情况下,使用CoreLocation
可以自己获得真正的位置。
好吧,我猜你需要在调用func addAsset(image: UIImage, location: CLLocation? = nil) {...}
之前先访问用户的位置func addAsset(image: UIImage, location: CLLocation? = nil) {...}
所以在func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {....}
某个地方func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {....}
我打电话给:
let locationManager = CLLocationManager() if CLLocationManager.locationServicesEnabled() { locationManager.delegate = self locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters locationManager.startUpdatingLocation() } else{ //Location service disabled" } //and then call.... addAsset(image: pickedImage, location: locationManager.location)
一旦我完成了:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {...}
我停止更新位置:
locationManager.stopUpdatingLocation()
这对我有用