Today, there is a bug in the project operation, and it crashes and flashes back directly, as shown below:

The Xcode build system has crashed. Please close and reopen your workspace.
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Solutions are as follows:

The first:

Open: ~ / repository/Developer/Xcode/DerivedData/clean off DerivedData file, reopen the project;

The second:

Click Project Setting to change new Build System(Default) to Legacy Build System.