如何刪除舊的data model version

這是一個小技巧：

1. 設置好當前要使用的版本;
2. 在XCode中刪除.xcdatamodeld的引用 (Right-click -> Delete -> Remove Reference Only);
3. 在Finder中顯示.xcdatamodeld包內容 (Right-click -> Show Package Contents);
4. 刪除不想要的.xcdatamodel舊版本文件;
5. 重新將.xcdatamodeld添加到項目中。

It's a hack, but this worked for me:

1. Set the Current version of the model in Xcode to one that you want to keep
2. Remove the .xcdatamodeld from your project (Right-click -> Delete -> Remove Reference Only)
3. Show the contents of the .xcdatamodeld package in the Finder (Right-click -> Show Package Contents)
4. Delete the .xcdatamodel file(s) that you don't want anymore
5. Re-add the .xcdatamodeld file to your project

原文地址