After creating simple code to getting data from CoreData, I realised that some unknown errors are fired. I read that fetching data in background is not that simple. Unfortunately I'm new in iOS developing and only know Swift, where there are many objective-C tutorials for that. This is my code:After creating simple code to getting data from
阅读背景：
如何在后台使用核心数据？
来源：互联网
分享到：
