Double不能附加到AnyObject数组？

Question

我尝试将Double类型变量operand附加到AnyObject数组中。

private var internalProgram = [AnyObject]()
internalProgram.append(operand)

但是，显示Argument type 'Double' does not conform to expected type 'AnyObject'。我必须将operand转换为AnyObject吗？

Answer 1

let numberOperand = NSNumber(double: operand)
yourArrayOfAnyObject.append(numberOperand)