ios - 如何将选中的图片转换为字符串进行存储？

Question

我在 Assets.xcassets 中有名为 city_00,city_01,...,city_10 的图像

我将它们存储在一个数组中

 let cityImages: [UIImage] = [UIImage(named: "city_00")!,UIImage(named: "city_01")!,.....UIImage(named: "city_10")!]

然后我在我的项目中使用 collectionview 调用它们并允许用户选择他们喜欢的任何城市

 var imageSelected = [UIImage]()
 var cityImage:UIImage?

   func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let cell = collectionView.cellForItem(at: indexPath)
        collectionView.allowsMultipleSelection = false
        cityImage = imageSelected[(indexPath as NSIndexPath).row]
}

我喜欢通过将所选图像转换回字符串来将它们保存在数据库中。我该怎么做？

Answer 1

let cityImageData = UIImagePNGRepresentation(cityImage)
let imageString = cityImageData?.base64EncodedString()