二进制运算符'==='不能应用于类型为'Any?'的操作数和"UIBarButtonItem！"

问题描述

以下代码曾经能够在swift 2.2中进行编译，而不再能够在swift 3.0中进行编译.我们该如何解决?

The following code used to be able to compile in swift 2.2, no longer in swift 3.0. How do we fix this?

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if sender === saveButton { // Error!
        // ...
    } else if sender === closeButton { // Error!
        // ...
    }
}

推荐答案

错误消息所言.在Swift 3中，Objecitve-C id被导入为Any，并且如果没有显式强制转换，则不能调用Any的任何操作，包括===.

As the error message is saying. In Swift 3, Objecitve-C id is imported as Any, and you cannot call any operations for Any including ===, without explicit cast.

尝试一下:

if sender as AnyObject? === saveButton {

(其他sender比较均相同.)

请记住，在Swift 3中，as AnyObject已成为风险最高的操作之一，在其他情况下，请勿使用as AnyObject.

And remember, in Swift 3, as AnyObject has become one of the most risky operations, you should not use as AnyObject in other cases.

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