iOS:定位iOS 9时使用Swift 4 [英] iOS: Using Swift 4 when targeting iOS 9

问题描述

Swift 4添加了一些非常酷的功能，例如强类型化的键路径和 JSON编码/解码使用Codable .

Swift 4 is adding some really cool features, like strongly typed keypaths and JSON encoding/decoding using Codable.

我想在仍针对iOS 9及更高版本的情况下使用这些新功能.

I would like to use these new features while still targeting iOS 9 and above.

据我了解，Swift语言版本未绑定到iOS版本，例如，与Foundation框架相反.但是，如果正确，我找不到任何信息.

As far as I understand, Swift language version is not bound to a version of iOS, as opposite to Foundation framework, for example. However, I can't find any info if that's correct.

在将iOS定位为11之前的版本时，我可以使用Swift 4吗?

Can I use Swift 4 when targeting iOS older than 11?

推荐答案

是的，就像Swift 1，Swift 2和Swift 3一样，您可以在任何版本的iOS 7及更高版本上使用Swift 4 >.

Yes, just like with Swift 1, Swift 2 and Swift 3, you can use Swift 4 with any version of iOS 7 and above.

请参见Swift 3的类似问题: Swift 2.0最低系统版本要求(部署目标)

See this similar question for Swift 3: Xcode 8 / Swift 3 and installing apps on iPhone 4 running iOS 7
See this similar question for Swift 2: Swift 2.0 minimum system version requirement (deployment target)

注意:由于iOS 11放弃了对32位的支持，因此您将只能通过arm64 slice(即，从iPhone 5S及更高版本)使用iOS 11. 来源:

Note: as iOS 11 is dropping support for 32-bit, you will only be able to use iOS 11 from an arm64 slice (that is, from iPhone 5S and up). Source:

iOS 11不再支持armv7或armv7s(32位).如果iOS目标具有iOS部署 目标为11，则它将不会针对32位进行构建.具有较早的iOS部署目标的iOS目标 默认情况下，超过11的版本仍会针对32位进行构建. (32163517)

iOS 11 no longer supports armv7 or armv7s (32-bit). If an iOS target has an iOS Deployment Target of 11, then it will not build for 32-bit. iOS targets with an iOS Deployment Target earlier than 11 will still build for 32-bit by default. (32163517)

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