如果我安装了3.0 SDK，我还可以制作2.0兼容的应用程序吗？
我一直在推迟安装 3.0 beta SDK，以防我无法制作面向 2.0 的应用程序。 如果我在电脑和 iPhone 上安装 3.0，我是否仍然可以向应用商店提交应用程序供使用 2.0 iPhone 的用户下载？ 我是否必须等到 3.0 发布才能提交更多应用程序？
I've been putting off installing the 3.0 beta SDK in case I can't make apps to target 2.0. If I install 3.0 on my computer and iPhone, will I still be able to submit apps to the app store for users with 2.0 iPhones to download? Will I have to wait until 3.0 is released to submit more apps?
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实际上，我建议在 OS 3.0 上进行测试，因为这是您的应用在新操作系统上不会中断的要求。
您仍然可以构建 2.*，但我可以看到仅在一台设备上进行测试会让您感到紧张。一旦安装了 3.0，就无法回滚到以前的操作系统。 ，如果这个设备也是你的日常手机，请确保你接受可能的错误（虽然我没有听说过任何严重的问题。OS 3.0是值得的）
至于你解决的问题，苹果说：
。虽然从技术上讲，他们是对的，您只需选择 SDK for 2.2.1，就可以了。
Actually, I suggest testing on OS 3.0 as it's a requirement your app doesn't break on the new OS.
You can still build for 2.* but I can see how testing on only one device can make you nervous. There is no way to rollback to a previous OS once 3.0 has been installed. So, if this device is also your everyday cell phone, make sure you accept possible bugs. (though I haven't heard of any seriuous problems. OS 3.0 is worth it)
As for the issue you address. Apple says:
I think they didn't express themselves too well. While technically spoken, they are right, you just have to select SDK for 2.2.1, and you're good to go.
是的，您可以构建 2.* 应用程序。 不可以，您无法将 3.0 之前的应用程序提交到应用程序商店。 我无法为您粘贴链接，因为我被视为新用户，所以只需谷歌“iPhone 3.0 应用程序提交”即可。
Yes you can build 2.* apps. No you can't submit pre 3.0 apps to the app store. I can't paste the link for you since I am considered a new user, so just google "iPhone 3.0 app submit".
我知道您不久前写了这篇文章并且您已经接受了答案，但我还有更多建议：
I understand that you wrote this a while ago and you've already accepted an answer, but I have some more advice:
如果您不喜欢新软件，您可以免费获得它，或者回滚到 http://www. felixbruns.de/iPod/firmware/
下载然后按照以下步骤操作
1.) 下载后打开 itunes 并插入您的 iPod/iPhone
2.) 如果在 Windows 上按住 Shift 键（在 Mac 上按住 Option 键），然后单击“恢复”
3.) 选择ipod文件然后等待恢复
4.）您需要设置为新的ipod（如果从备份恢复，速度会很慢）
You can get it free or roll back if you do not like the new software at http://www.felixbruns.de/iPod/firmware/
download then follow these steps
1.) after it downloads open itunes and plugin your ipod/iphone
2.) Hold shift if on windows (Option key on mac) and then click resotre
3.) Select the ipod file and then wait for restore
4.) you will need to set up as new ipod (it will be slow if you restore from backup
3.0 SDK的安装提到弱链接框架 --
我还没有做到这一点，但一旦弄清楚就会更新。
The installation of the 3.0 SDK mentions weaklinked frameworks --
I have yet to accomplish this, but will update once figured out.