[NSPlaceholderString initWithString:]: nil argument- 参数为空导致!
一个错误,坑我太久啊!!!伤不起!原来是传参数A,A参数为空!!!一定要谨慎啊!做参数判断!!! ***Terminatingappduetouncaughtexception'NSInvalidArgumentException',reason:'***-[NSPlaceholderStringinitWithString:]:nilargument'***Firstthrowcallstack