为什么不使用new()类方法在Swift中创建对象? [英] Why using new() class method to create an object in Swift doesn't compile?

问题描述

在Objective-C中，我不是 new 的忠实拥护者.但是这个问题提出了疑问.为什么不能编译?:

I wasn't a big fan of new in Objective-C. But this question raised the doubt. Why this does not compile?:

let j = NSNumber.new()
var s = NSString.new()

看起来像 new()是常规的类方法.尽管在Apple的文档中，在名称??

Looks like new() is a regular class method. Although in Apple's doc is defined with back ticks around the name ??

class func `new`() -> Self!

因此，问题仍然存在.如果NSObject中有 new()，为什么不编译?文件雷达?

So, the question remains. If new() is there in NSObject, why does not compile? File Radar?

推荐答案

new 是保留关键字，您必须使用反引号将其转义.这将起作用:

new is a reserved keyword and you have to escape it with backticks. This will work:

let string = NSString.`new`()

但是我建议使用"Swift"方式，因为它更短，更干净并且适用于非 NSObject 种:

But I recommend using the "Swift" way as it shorter, cleaner and works for non NSObject kinds:

let string = NSString()

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