UIImagePickerControllerを使用せずにUIImageメタデータを取得する

Question

UIImagePickerControllerを使用せずにUIImageメタデータを取得する方法。

私は基本的に変数UIImageを持っており、メタデータを取得したいと思います。

たとえば、日付にアクセスするには "myImage.date"のようなものが必要です。

EDIT 1：私はあなたがこの便利な出発点を見つけるかもしれないこれを試して、それがクラッシュ（EXIFのVARに見つかっゼロ）

func getData(image: UIImage) { 
    guard let data = UIImageJPEGRepresentation(image, 1), 
     let source = CGImageSourceCreateWithData(data as CFData, nil) else { return} 


    let imageProperties = CGImageSourceCopyPropertiesAtIndex(source, 0, nil) 
    let a = Unmanaged.passUnretained(kCGImagePropertyExifDateTimeOriginal).toOpaque() 
    let exif = CFDictionaryGetValue(imageProperties, a) 
    print(exif) 
} 

Answer 1

...

func getMetaData(forImage image: UIImage) { 
    guard let data = UIImageJPEGRepresentation(image, 1), 
     let source = CGImageSourceCreateWithData(data as CFData, nil) else { return} 

    if let type = CGImageSourceGetType(source) { 
     print("type: \(type)") 
    } 

    if let properties = CGImageSourceCopyProperties(source, nil) { 
     print("properties - \(properties)") 
    } 

    let count = CGImageSourceGetCount(source) 
    print("count: \(count)") 

    for index in 0..<count { 
     if let metaData = CGImageSourceCopyMetadataAtIndex(source, index, nil) { 
      print("all metaData[\(index)]: \(metaData)") 

      let typeId = CGImageMetadataGetTypeID() 
      print("metadata typeId[\(index)]: \(typeId)") 


      if let tags = CGImageMetadataCopyTags(metaData) as? [CGImageMetadataTag] { 

       print("number of tags - \(tags.count)") 

       for tag in tags { 

        let tagType = CGImageMetadataTagGetTypeID() 
        if let name = CGImageMetadataTagCopyName(tag) { 
         print("name: \(name)") 
        } 
        if let value = CGImageMetadataTagCopyValue(tag) { 
         print("value: \(value)") 
        } 
        if let prefix = CGImageMetadataTagCopyPrefix(tag) { 
         print("prefix: \(prefix)") 
        } 
        if let namespace = CGImageMetadataTagCopyNamespace(tag) { 
         print("namespace: \(namespace)") 
        } 
        if let qualifiers = CGImageMetadataTagCopyQualifiers(tag) { 
         print("qualifiers: \(qualifiers)") 
        } 
        print("-------") 
       } 
      } 
     } 

     if let properties = CGImageSourceCopyPropertiesAtIndex(source, index, nil) { 
      print("properties[\(index)]: \(properties)") 
     } 
    } 
}