X-code 6.3.2

[构建设置]选项。 [所有]-[构建选项]-[C / c++ /Objective-C编译器]-[默认编译器(Apple LLVM 6.1)]

然后重新构建项目，它可以正常运行。

当我在Xcode 10.3中添加两个objective-c文件时，没有一个解决方案适合我。我通过以下步骤固定，

进入构建阶段 检查.m文件是否存在于编译器源代码中。如果不加的话 在.m文件旁边添加编译器标志的-objc标志

错误消息是通用的，实际上并没有告诉您它的真正含义。

对我来说，我必须恢复早期的github回归，这给:

armv7 armv7s arm64

对建筑。

也许可以考虑安装最新版本的Xcode。

在尝试了所有其他的解决方案(对我来说并不管用)之后，我这样做了，这个问题自动得到了解决。

按下运行/停止按钮右侧所需按钮，选择方案菜单:

按编辑方案…：

选择你的可执行文件:

None of the provided answers worked for me. In my case, I finally fixed the error by updating the target architectures in Build Settings/Architectures/Valid Architectures to $(ARCHS_STANDARD), as arm64 was missing. This was not prohibiting the project to build, although a warning was issued recommending updating the valid architectures, but the "app could not be opened" error was shown at run time. I surmise this error is rather generic and not always linked with a permission issue, but may be displayed when the generated app package is invalid.