需要 NSDecimalNumber 帮助
我正在尝试获取我拥有的 NSDecimalNumber，并将其乘以 1.1。
我有这个，但它不起作用：
NSDecimalNumber *multipy = [NSDecimalNumber decimalNumberWithMantissa:1.1 exponent:0 isNegative:NO];
NSDecimalNumber *savings = [totalExpenses decimalNumberByMultiplyingBy:multipy];
更新：
这是完整的代码，有人知道为什么它不起作用吗？
NSDecimalNumber *totalExpenses = [[event.housePayment decimalNumberByAdding:event.carPayment] decimalNumberByAdding:event.loanPayment];
NSDecimalNumber *multiply = [NSDecimalNumber decimalNumberWithMantissa:11 exponent:-1 isNegative:NO];
NSDecimalNumber *savings = [totalExpenses decimalNumberByMultiplyingBy:multiply];
在乘法行崩溃，错误：*** 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[UITableViewCell DecimalNumberByMultiplyingBy:]：无法识别的选择器发送到实例 0x5d91a60”
I'm trying to take an NSDecimalNumber I have, and multiply it by 1.1.
I have this but it doesn't work:
NSDecimalNumber *multipy = [NSDecimalNumber decimalNumberWithMantissa:1.1 exponent:0 isNegative:NO];
NSDecimalNumber *savings = [totalExpenses decimalNumberByMultiplyingBy:multipy];
Update:
Here is the whole code, does anyone know why it doesn't work?
NSDecimalNumber *totalExpenses = [[event.housePayment decimalNumberByAdding:event.carPayment] decimalNumberByAdding:event.loanPayment];
NSDecimalNumber *multiply = [NSDecimalNumber decimalNumberWithMantissa:11 exponent:-1 isNegative:NO];
NSDecimalNumber *savings = [totalExpenses decimalNumberByMultiplyingBy:multiply];
Crashes at multiplication line, with error: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITableViewCell decimalNumberByMultiplyingBy:]: unrecognized selector sent to instance 0x5d91a60'
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尾数必须是整数，因此可以通过乘以十然后将指数减一来进行调整。
IE
Mantissa needs to be an integer, so adjust for this by multiplying by ten and then reducing your exponent by one.
i.e.
尝试：
Try: