ios - Swift - 4 - 无法将类型 '__NSCFNumber' (0x10cfb1840) 的值转换为 'NSString' (0x10c0824a8)

Question

我收到此错误:

Could not cast value of type '__NSCFNumber' (0x10cfb1840) to 'NSString' (0x10c0824a8)

在这行代码中:

fkprofession = (pickOption[pickerView.selectedRow(inComponent: 0)]["id"] as? String)!

pickOption 定义为:

var pickOption = Array<Dictionary<String, Any>>()

我做错了什么？

Answer 1

错误非常明显:键id的值是一个数字(Int或可能Double)

您可以将无法转换错误始终读取为

Could not cast value of the right type to my proposed wrong type

fkprofession = pickOption[pickerView.selectedRow(inComponent: 0)]["id"] as! Int

或者如果你需要一个字符串

fkprofession = String(pickOption[pickerView.selectedRow(inComponent: 0)]["id"] as! Int)