iOS 程序報錯：reason: [NSArrayI addObject:]: unrecognized selector sent to instance

  *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI addObject:]: unrecognized selector sent to instance 0x4b17be0'   錯誤：NSArray 不能使用 addObject:方法。可能是在程序

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