swift学习记录（selector）

转载自：http://stackoverflow.com/questions/24007650/selector-in-swift

https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/InteractingWithObjective-CAPIs.html#//apple_ref/doc/uid/TP40014216-CH4-XID_26

原文：An Objective-C selector is a type that refers to the name of an Objective-C method. In Swift, Objective-C selectors are represented by the Selector structure. You can construct a selector with a string literal, such as let mySelector: Selector = "tappedButton:". Because string literals can be automatically converted to selectors, you can pass a string literal to any method that accepts a selector.

翻译：在Objective-C 中 selector是指向方法名的类型，在swift中Selector由结构构造，你可以直接用字符串构造一个Selector,例如：let mySelector = "tappedButton",因为字符串可以自动转化成selectors，你可以直接输入方法名的字符串，来适配一个selector。

原文：NOTE

The performSelector: method and related selector-invoking methods are not imported in Swift because they are inherently unsafe.

翻译：注意：

performSelector方法和设计selector的方法并没有在Swift中被引入，因为他们是不安全（固有的）的。