当 4.0 即将公开时，我是否应该开始学习 iPhone SDK 3.2？
刚刚成为一名 iPhone 开发人员。我对此完全陌生，不太确定是否应该开始学习 SDK 版本 3.2 还是 4.0。我找到了大量 3.2 的视频和教程，但 4.0 的视频和教程却很少。
那么我应该从 3.2 开始，然后再担心 4.0 吗？或者我是否需要重新学习 3.2 中学到的很多东西？
非常感谢您的意见。 :)
Just became an iPhone developer. I'm completely new to this, and not really sure whether I should start learning SDK version 3.2 or 4.0. I found tons of videos and tutorials for 3.2, not a lot for 4.0.
So shall I start with 3.2 and then worry about 4.0 later? or am I going to have to re-learn many things that I will learn in 3.2?
Your input is much appreciated. :)
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你不需要学习很多新东西。基础 SDK 非常相似，并且几乎每种方法都向后兼容。 iPhone 应用程序架构的基本设计模式没有改变，因此，您可以开始学习 3.1.3 或 3.2，并在您可以访问 4.0 时赶上（现在，如果您在付费开发人员计划中）。
You will not have to learn very many new things. The base SDK is very much the same, and nearly every method is backwards compatible. The basic design patterns of iPhone app architecture have not changed and thus, you can start learning on 3.1.3 or 3.2 and catch up whenever you have access to 4.0 (now if you are in the paid developer program).
你的时间范围是多少？绝大多数内容根本不会改变 - 如果您感兴趣，绝对没有理由不立即开始。
此外，即使您正在开发的 API 发生了变化，了解它们过去是如何做事的以及它们为何发生变化也是一种宝贵的知识（您可以下载现在的 iPhone 4.0 SDK 测试版，并手动进行比较）喜欢）。
最后，苹果因延迟发布最终文档而臭名昭著——我绝对不会依赖他们何时发布来开始学习。
What's your time frame? The vast majority of content will not change at all - if you're interested, there's absolutely no reason to not start now.
Further, even if the API that you're working on changes, understanding how they used to do things, and why they changed is a valuable bit of knowledge (you can download the iPhone 4.0 SDK now in beta, and manually compare if you'd like).
Finally, Apple is notorious about delaying release of final documentation - I would definitely not take a dependency on when they ship it to start learning.
唯一需要注意的是，3.2 有一些 iPad 特有的东西，其中大部分将适用于 iPhone OS 4.0。
The only thing to be aware of is that 3.2 has some iPad specific things, most of it will apply to iPhone OS 4.0.
我认为你现在就应该开始了。理解 iPhone 的设计模式、架构共享和编程风格等基础知识。我认为如果您现在使用很少的 API 进行一些练习来学习后者，那就更好了。
APPLE 从一开始就非常强调 SDK 的可靠性和可扩展性，并且随着时间的推移不会进行根本性的改变（开放/关闭原则）。
我鼓励你学习，不仅是 iPhone SDK 或 CocoaTouch，而且要深入了解 Objective C。
I think that you should start by now. Understating basics as design patterns, architectural commons and styles of programming for iPhone. I think this is better if you acquire some practice now with little APIs to learn that latter.
APPLE has a very strong emphasis on making SDKs solid and very extensible since the beginning and not doing radical changes over the time (Open/Close Principle).
I encourage you learn, not only iPhone SDK or CocoaTouch, but to acquire a deep understanding of Objective C.