如果与OR条件一起使用 [英] if let with OR condition

问题描述

是否可以通过Swift的if let使用或"条件?

Is it possible to use an "OR" condition using Swift's if let?

类似的东西(对于Dictionary<String, AnyObject>词典):

Something like (for a Dictionary<String, AnyObject> dictionary):

if let value = dictionary["test"] as? String or as? Int {
       println("WIN!")
}

推荐答案

这没有任何意义，当您只有一个if语句时，如何分辨value是Int还是String?但是，您可以执行以下操作:

This would make no sense, how would you be able to tell whether value is an Int or a String when you only have one if statement? You can however do something like this:

let dictionary : [String : Any] = ["test" : "hi", "hello" : 4]


if let value = dictionary["test"] where value is Int || value is String {
    print(value)
}

(在Swift 2.0中测试)

(Tested in Swift 2.0)

如果您需要根据类型进行其他操作，也可以执行以下操作:

You can also do this if you need to do different things depending on the types:

if let value = dictionary["test"] {
    if let value = value as? Int {
        print("Integer!")
    } else if let value = value as? String {
        print("String!")
    } else {
        print("Something else")
    }
}

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