运行时报错
may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
解决方案
添加环境变量: 点击窗口上的Run->Edit Configurations...->Environment variables->点击输入栏后的文件夹图标,
添加内容，key: OBJC_DISABLE_INITIALIZE_FORK_SAFETY, value: YES.
完整示例, OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES