NSDecimalNumbers的运行时错误？ [英] runtime error with NSDecimalNumbers?

问题描述

当这行代码运行时我收到错误，我不熟悉NSDecimalNumber所以我不确定这行有什么问题，Xcode在我实际运行代码之前没有给我任何错误。

I am getting an error when this line of code runs, I am unfamiliar with NSDecimalNumber so Im not really sure what is wrong with this line and Xcode is not giving me any error until I actually run the code.

if ([unit1 isEqualToString: [_Distance objectAtIndex:0]])
        universalAns = [num1 decimalNumberByMultiplyingBy: (NSDecimalNumber*)[NSDecimalNumber numberWithDouble:0.0254]];

这里是调试器输出到目前为止：



self（ViewController *）0x8c8cd10

unit1 =（__ NSCFConstantString *）@inches

universalAns NSDecimalNumber * nil

num1（__ NSCFNumber *）（双）0

_Distance（__ NSArrayI *）@8个对象



任何想法都会有所帮助，

提前致谢！

here is the debugger output up to this point:

self (ViewController *) 0x8c8cd10
unit1 = (__NSCFConstantString *) @"inches"
universalAns NSDecimalNumber * nil
num1 (__NSCFNumber *) (double)0
_Distance (__NSArrayI *) @"8 objects"

Any ideas would be helpful,
Thanks in advance!

推荐答案

我解决了，由于某种原因，num1不是NSDecimalNumber。

I solved it, num1 was not a NSDecimalNumber for some reason.

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