Swift中的Int vs Integer [英] Int vs Integer in Swift

问题描述

有谁知道这两种类型之间有什么区别？

Does anyone know what the difference is between these two types?

文档只引用 Int 但是当我输入时，Xcode 6自动完成只给我整数。我只是在移植代码时才开始使用 Integer 来查找你必须在两种类型之间进行转换。

The docs only refer to Int but Xcode 6 auto complete only gives me Integer when I type. I started using Integer when porting code only to find that you have to cast between the two types.

例如以下代码给出了错误无法找到接受提供的参数的+的重载。

For instance the following code gives the error Could not find an overload for '+' that accepts the supplied arguments.

var number1 : Int = 5
var number2 : Integer = 10
number1 + number2

推荐答案

Int 是类型，而整数是一个类型它实现的协议。

An Int is the type whilst an Integer is a protocol it implements.

你应该在声明中使用 Int ，即：

You should be using Int in declarations, i.e:

var num: Int = 5

这也是未指定类型时推断的整数文字的类型，即：

which is also the type that's inferred for integer literals when a type isn't specified, i.e:

var num = 5

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