Obtenir les métadonnées UIImage sans utiliser UIImagePickerController

Question

Comment obtenir les métadonnées UIImage SANS utiliser UIImagePickerController.

J'ai fondamentalement une variable UIImage et je veux obtenir les métadonnées.

J'aurais besoin de quelque chose comme "myImage.date" pour accéder à la date par exemple.

EDIT 1: J'essaie cela, mais il bloque (trouvé nul sur exif var)

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

Vous pourriez trouver ce point de départ utile ...

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)") 
     } 
    } 
}