什么时候在Swift中使用@objc? [英] When to use @objc in Swift?

问题描述

在Swift中，我看到一些类似的方法:

In Swift, 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，但他们说要在Objective-C中调用它时，应添加@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Swift中的私有函数，@ obj的作用是什么?

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

推荐答案

private表示仅在Swift中可见. 因此使用@objc在Objective-C中可见. 如果您有可以快速选择私有功能的功能，则为必填项.

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属性使您的Swift API在Objective-C和Objective-C运行时中可用.

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

请参阅: 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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