使用swift保存相册中的图片

I've written a steganography application in Swift v2. The workflow is simple : I open an image, I type in a message to save, I perform bitmanip to modify the least significant bit and then I save to photo album.

我在Swift v2中编写了一个隐写应用程序。工作流程很简单:打开一个图像，输入要保存的消息，执行bitmanip以修改最不重要的位，然后保存到相册。

Problem is, iOS is running compression (I believe) on my image and some of the bits change.

问题是，iOS正在我的图像上运行压缩(我相信)，一些位元发生了变化。

How can I save my image directly to the photo album without having iOS change any of my bits? (I can post the code here, but there is a lot of it)

如何将我的图像直接保存到相册中，而不让iOS更改我的任何位元?(我可以在这里发布代码，但是有很多)

(this is a small snippet of the overall code)

(这是整个代码的一小部分)

 let imageRef = CGBitmapContextCreateImage(context);

 let newImage = UIImage(CGImage: imageRef!)
 UIImageWriteToSavedPhotosAlbum(newImage, nil, nil, nil)

1 个解决方案

#1

It seems that I just needed to convert my newImage to be a UIImagePNGRepresenation.

看起来我只是需要将我的newImage转换成UIImagePNGRepresenation。

 let imageRef = CGBitmapContextCreateImage(context);
 let newImage = UIImage(CGImage: imageRef!)
 let newImagePNG = UIImagePNGRepresentation(newImage)
 var saveableImage = UIImage(data: newImagePNG!)
 saveImage(saveableImage!)