我应该将图像保存到iOS App的本地存储中吗？

Question

I am working on a project where i want to make the data, text, images available in offline mode as well.

I fetch data from a web-service which includes image urls and other data. I store the text data in core data entities, however i don't save images locally but fetch them in realtime.

To view images in offline mode i will have to save them to local storage. However i am wondering if it would be the right approach. Saving images to local may possibly eat up a lot of storage on user's device.

What is the best approach to address this problem?

Should i save images to local or should i fetch them on run time only?

Answer 1

Use NSCache. With NSCache you can set a limit to how many images and so on are cached. See Apple's documentation for more details: https://developer.apple.com/reference/foundation/nscache?language=objc

Edit: Never mind NSCache, just save the images as files. NSCache can still save you network usage and allow your app to be more responsive, but it is not what you want.

Answer 2

Should i save images to local or should i fetch them on run time only?

This question for you , you should decide what you need or what is will be more suitable for your app . at any way if you want to cache images i suggest to use this library SDWebImage