如何使iPhone App与多个SDK（固件）版本兼容 [英] How To Make iPhone App compatible with multiple SDK (firmware) versions

查看：126 发布时间：2018/9/22 9:10:11 iphone iphone-sdk-3.0 compatibility ios4

本文介绍了如何使iPhone App与多个SDK（固件）版本兼容的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

随着iOS4即将推出，我已经计划在未来的应用更新中加入iAd。我认为这将使我的应用程序无法用于固件低于4.0的任何人。有没有办法根据用户的固件更改变量和.xib文件？
干杯。

With iOS4 coming out soon, I have already planned to include an iAd in a future update of an app of mine. I assume that this will make my app unusable for anyone on a firmware lower than 4.0. Is there a way to change that variables and the .xib file based on the user's firmware? Cheers.

推荐答案

是的，您可以使用最新的SDK（即：5.1）构建并仍在设备上运行使用早期版本的固件（SDK）。

Yes, you can build with the latest SDK (ie: 5.1) and still run on devices with earlier versions of the firmware (SDK).

将部署目标设置为您希望能够运行的最早版本，即：3.0。

您将Base SDK设置为您正在编译的最新版本，即：5.0。这样，您可以在代码中引用较新的定义和符号。本文SDK和部署目标详细讨论部署与基础SDK。

指向仅在较新的iOS中可用的符号的库/框架的弱链接。这样您的应用就会在没有新符号的设备上运行。

您必须在调用之前检查是否有更新的方法。只有当您的应用程序位于<时，您才必须确保不要调用5.0或4.X的方法。 4.0设备。当然，您必须通过使用旧方法或不支持需要更新SDK支持的特定功能来优雅地处理旧版本。

NEW w / XCode 4.2：要支持旧设备，您需要将armv6 添加到构建体系结构和从所需设备功能的plist中删除armv7 。

Set your Deployment Target to the earliest version you want to be able to run with, ie: 3.0.
You set your Base SDK to the latest version that you are compiling with, ie: 5.0. This way you can reference the newer definitions and symbols in your code. This article "SDK and Deployment Targets" discusses Deployment vs Base SDK in detail.
Weak link to the libraries/frameworks with symbols that are only available in the newer iOS. This is so your app will run on a device that doesn't have the newer symbols.
You must check to see that a newer method is available before calling it. You have to make sure not to call a method that is 5.0 or 4.X only when your app is on a < 4.0 device. Of course you have to gracefully handle working on older versions by either using older methods or not supporting particular features that need newer SDK support.
NEW w/XCode 4.2: To support older devices you need to add armv6 to the build architectures and remove armv7 from the plist of required device capabilities.

有关详细信息，请参阅以下SO问题和解答：

See these SO questions and answers for more details: