NSFontAttributeName vs NSAttributedStringKey.font [英] NSFontAttributeName vs NSAttributedStringKey.font

问题描述

我在使用一段时间的库中使用Swift代码时遇到了一些麻烦。
似乎与某种版本冲突有关，但我不确定。

I am having some trouble with Swift code in a library I have been using for a while. It seems related to some kind of version conflict, but I am not sure.

以下是代码：

let attribMsg = NSAttributedString(string: msg,
                               attributes: [NSAttributedStringKey.font:UIFont.systemFont(ofSize: 23.0)])

以下是我从编译器获得的错误消息：

Here is the error message I get from the compiler:

Type 'NSAttributedStringKey' (aka 'NSString') has no member 'font'
    Did you mean 'zone'?  Fix(button)

在不同的项目中使用此代码，我注意到其中一些我没有得到错误消息，所有编译都没有任何问题。

Using this code in different project I noticed that on some of them I do not get the error message and it all compiles without any problem.

我还注意到，如果我用以下代码替换上面的代码：

I also noticed that if I replace the above code by the following:

let attribMsg = NSAttributedString(string: msg,
                               attributes: [NSFontAttributeName:UIFont.systemFont(ofSize: 23.0)])

项目一个问题将起作用，而其他人（以前工作）显示另一条消息：

The projects with a problem will work while the others(previously working) show this other message:

'NSFontAttributeName' has been renamed to 'NSAttributedStringKey.font'

换句话说，某些项目使用一种类型的代码，而另一些项目则使用另一种类型。

In other words some projects work with one type of code and some others work with the other type.

不用说我每次从一个项目切换到另一个项目时都不想更改代码。

Needless to say that I do not want to change the code each time I switch from one project to another.

我改变项目的部署目标的实验似乎没有太大的区别。
所以我的问题是：处理这个问题的方法是什么？

The experiments I made changing the Deployment Target of the project do not seem to make much difference. So comes my question: What is the way to handle this issue?

推荐答案

这些项目可能是不同版本的Swift。

The projects are probably in different versions of Swift.

在Swift 4中， NSFontAttributeName 已被<$ c替换$ c> NSAttributedStringKey.font 。

In Swift 4, NSFontAttributeName has been replaced with NSAttributedStringKey.font.

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