新手错误：我删除了我项目中所有低于目标的东西。如何重建/恢复它们？我不能编译或做任何事情，它还说我缺少基本SDK。帮助
您最好创建一个同名的新项目，并将所有类复制回该项目中。应该不会花很长时间。
要添加目标，请右键单击“组和文件”窗格中的“目标”图标，然后单击“添加…”。。。
To set the Base SDK, go to the Projects menu, and click Edit Project Settings. In the window that pops up, click the "Build" tab. In the "Architectures" section, set the "Base SDK" to "Latest iOS..."
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