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[Swift]imagePickerControllerで写真のexif情報(位置情報)を取得するサンプル

Last updated at Posted at 2018-06-28

【写真のexif情報を取得方法】

前提条件

info.plistの設定 import Photos UIImagePickerDelegate imagePickerControllerの呼び出し

以下、写真が押された時に呼ばれる関数です。

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    // 選択したアイテムの元のバージョンのAssets Library URL
    let assetUrl = info[UIImagePickerControllerReferenceURL] as! URL
    // PHAsset = Photo Library上の画像、ビデオ、ライブフォト用の型
    let result = PHAsset.fetchAssets(withALAssetURLs: [assetUrl], options: nil)
    let asset = result.firstObject
    // コンテンツ編集セッションを開始するためのアセットの要求
    asset?.requestContentEditingInput(with: nil, completionHandler: { contentEditingInput, info in
        // contentEditingInput = 編集用のアセットに関する情報を提供するコンテナ
        let url = contentEditingInput?.fullSizeImageURL
        // 対象アセットのURLからCIImageを生成
        let inputImage = CIImage(contentsOf: url!)!
        // CIImageのpropertiesから画像のメタデータのなかのGPSを取得する
        if inputImage.properties["{GPS}"] as? Dictionary<String,Any> == nil {
            print("この写真にはGPS情報がありません")
        } else {
            let gps = inputImage.properties["{GPS}"] as? Dictionary<String,Any>
            var latitude = gps!["Latitude"] as! Double
            let latitudeRef = gps!["LatitudeRef"] as! String
            var longitude = gps!["Longitude"] as! Double
            let longitudeRef = gps!["LongitudeRef"] as! String
            if latitudeRef == "S" {
                latitude = latitude * -1
            }
            if longitudeRef == "W" {
                longitude = longitude * -1
            }
            print(latitude)
            print(longitude)
        }
    })
    picker.dismiss(animated: true, completion: nil)
}

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