如何删除旧的data model version

这是一个小技巧：

1. 设置好当前要使用的版本;
2. 在XCode中删除.xcdatamodeld的引用 (Right-click -> Delete -> Remove Reference Only);
3. 在Finder中显示.xcdatamodeld包内容 (Right-click -> Show Package Contents);
4. 删除不想要的.xcdatamodel旧版本文件;
5. 重新将.xcdatamodeld添加到项目中。

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

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