由于未捕获的异常而终止应用 'NSInvalidArgumentException',原因:' - [NSNull rangeOfCharacterFromSet:]:发送到实例的无法识别的选择器 0x30e483d0' ***首先抛出调用堆栈:(0x22ebcf87 0x304dfc77 0x22ec237d 0x22ec0259 0x22ec1548 0x26665113 0x267b8e03 0x267b8ed7 0x25d5ebd1 0x25d5ea59 0x25d5e447 0x25d5e251 0x25d5815d 0x22e83845 0x22e80f29 0x22e8132b 0x22dcedb1 0x22dcebc3 0x2a133051 0x2639aa31 0x327d63 0x30a7baaf)libc ++ abi.dylib:以未捕获的异常终止 输入NSException