何时在swift代码中使用@objc？ [英] when to use @objc in swift code?

问题描述

我是swift的新手，我看到一些方法，如：

I am new to swift, and I see some methods like:

@objc private func doubleTapGestureRecognized(recognizer: UITapGestureRecognizer)

我想知道何时使用@objc？我读了一些文档，但他们说当你希望它在Objective-C中可以调用时，你应该添加@objc标志

I was wondering, when to use @objc? I read some documents, but they are saying when you want it to be callable in Objective-C, you should add @objc flag

但是，这是一个私有函数swift，@ obj做了什么？

However, this is a private function in swift, what does the @obj do?

推荐答案

私人意味着它只在Swift中可见。
所以使用@objc在Objective-C中可见。
如果你有一个func来选择一个私有函数在swift中，它是必需的。

private mean it visible only in Swift. so use @objc to visible in Objective-C. If you have a func to selector a private func in swift, it is required.

@objc属性使你的Swift Objective-C和Objective-C运行时可用的API。

The @objc attribute makes your Swift API available in Objective-C and the Objective-C runtime.

参见：
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html

https://developer.apple.com/library/ios/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithObjective-CAPIs.html

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