从照片中提取 GPS 数据 iOS swift

Question

我需要从 UIImagePickerController 选取的照片中获取 GPS 数据并提取要在 UIMapKit 中使用的照片的位置，我在 Whosebug 和 Google 中尝试了一些示例代码，但是 none他们为我工作！我使用的照片包含纬度和经度数据，但它总是 return nil 并出现此致命错误："unexpectedly found nil while unwrapping an Optional value"，我在模拟器上测试该应用程序是否会导致任何问题？我考虑了各种问题，我是不是哪里做错了？这是代码

func imagePickerController(picker: UIImagePickerController!, didFinishPickingMediaWithInfo info: NSDictionary!) {

    if picker.sourceType == UIImagePickerControllerSourceType.PhotoLibrary {

       let url: AnyObject? = info[UIImagePickerControllerReferenceURL] as? NSURL

       let library = ALAssetsLibrary()
                    library.assetForURL(url as NSURL, resultBlock: { (asset: ALAsset!) -> Void in
           if asset != nil {
           var assetRep: ALAssetRepresentation = asset.defaultRepresentation()
           var metaData: NSDictionary = assetRep.metadata()
           let location = metaData.objectForKey(ALAssetPropertyLocation) as CLLocation!
           let lat = location.coordinate.latitude
           let long = location.coordinate.longitude
           }
  }, failureBlock: {
       (error: NSError!) in
        NSLog("Error!")

       }

     )} dismissViewControllerAnimated(true, completion: nil)}

Answer 1

我找到了解决方案，代码是正确的！但是当我通过拖放将照片复制到模拟器时，出于某种原因从照片中删除了 GPS 数据，我将照片存储到 Dropbox 并通过模拟器的 safari 下载它们！参考

Answer 2

这种方式更简洁。

import Photos

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
    guard let asset = info[.phAsset] as? PHAsset else { return }

    // Do whatever
    asset.location?.coordinate.latitude
    asset.location?.coordinate.longitude
}

从照片中提取 GPS 数据 iOS swift

extract GPS data from photo iOS swift

gps

latitude-longitude

uiimagepickercontroller

ios

swift