在swift中使用bridgeToObjectiveC（） [英] Use of bridgeToObjectiveC() in swift

问题描述

bridgeToObjectiveC（） 在swift中会做什么。这似乎是将 Swift 对象转换为 ObjectiveC 对象。这与类型转换相同吗？

What does bridgeToObjectiveC() will do in swift. It seems like converting a Swift object into ObjectiveC object. Is this same as type casting?

例如，我可以将swift String 转换为 NSString 喜欢

For example i can convert a swift String into NSString like

var swingString:String = "test string"
var correspondingNSString = swingString.bridgeToObjectiveC()  // Using bridge

var correspondingNSString = swingString as NSString      // type casting

我想知道两者是否相同？

I want to know both are same or not?

推荐答案

我的理解是提供了bridgeToObjectiveC（），因此您不一定需要知道相应的objective-c类型是什么;编译器决定适当的类型。

My understanding is that bridgeToObjectiveC() is provided so that you don't necessarily need to know what the corresponding objective-c type is; the compiler decides what the appropriate type is.

例如：如果你有一个的数组任何对象，你可以调用 bridgeToObjectiveC（ ）每个 map ，而不用担心是否有String，Int和Double值。

For example: if you have an array of Any objects can you call bridgeToObjectiveC() on each of them with map without worrying about whether there are String, Int, and Double values.

使用作为关键字，您可以明确选择要将值转换为的类型。

Using the as keyword allows you to explicitly choose which type you want to cast the value as.

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