XCode错误日志：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFConstantString identifier]: unrecognized selector sent to instance 0x1e0f1f570'

*** First throw call stack:

(0x18a91e678 0x182bafc80 0x18a9aefdc 0x18a863d88 0x18a9a4950 0x18d257d30 0x1030e5f0c 0x10301cc50 0x1928306a8 0x192832300 0x192840998 0x1928405b0 0x18a868f9c 0x18a865ca8 0x18a8653f8 0x1cde1b4f8 0x18cc8b8a0 0x18cc8aedc 0x102af6f7c 0x1ad5cedcc)