如何在swift中检查变量的类型

I want to know what the type is of a AnyObject variable that i initialise later. For example:

我想知道我稍后初始化的AnyObject变量的类型是什么。例如:

var test: AnyObject

test = 12.2

I cant figure out how to do this.

我无法弄清楚如何做到这一点。

1 个解决方案

#1

You can do this with the is operator. Example code:

您可以使用is运算符执行此操作。示例代码:

var test: AnyObject

test = 12.2

if test is Double {
    println("Double type")
} else if test is Int {
    println("Int type")
} else if test is Float {
    println("Float type")
} else {
    println("Unkown type")
}

According to Apple docs:

根据Apple文档:

Checking Type

Use the type check operator (is) to check whether an instance is of a certain subclass type. The type check operator returns true if the instance is of that subclass type and false if it is not.

使用类型检查运算符(is)检查实例是否属于某个子类类型。如果实例属于该子类类型,则类型检查运算符返回true,否则返回false。

#1