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Exactly one year ago, I had been working as an Android developer. At that time, I did not have any knowledge about iOS programming, even I had never used any Apple products. It, however, was in the past, I have been developing both iOS and Android apps in parallel.

Today, after looking back, I want to share the syllabus of iOS programming course that I created by myself for one-month studying. 
In my personal experience, I really recommend that Android developers learn to develop iOS apps. It sounds weird but don’t get me wrong. There is a reason: Expanding your knowledge widely helps you to go deeper in your field.

“If you do something and it turns out pretty good, then you should go do something else wonderful, not dwell on it for too long. Just figure out what’s next.”?—?Steve Jobs

Coming back to the main topic, I started by writing my own schedule for one month, and of course, every resources were completely free.

一年前,我还是一个 Android 开发者。那时候我没有任何 iOS 编程相关的知识,我甚至没用过任何苹果的产品。然而,这已成为过去,现在我已经能同时开发 iOS 和 Android 应用了。

现在,我想给大家传授一下我一个月学习 iOS 编程的秘诀。

我非常推荐 Android 开发者学习开发 iOS 应用。这听起来很奇怪,但值得一试,原因是:扩宽知识面可以帮助你在自己的领域中更加深入。 

    “如果你做了一些事,并且做好了,那就应该去做一些其它美好的事情,不要拖延太久。只是要弄清楚接下来要做什么。”—史蒂夫·乔布斯

不扯远了,回到主题。我为自己写了一个月的计划,然后开始了我的学习之旅。当然所有学习资源都是免费的。

Get started with Swift

You can learn Objective-C instead but I really recommend that you go with Swift. It is a friendly and easy to learn.

Apple official resource is the first place I visited. Read through basic concepts and get your hand dirty by coding them along on Xcode.

Besides, you can try Swift-learning course on Udacity. Although the website said that it will take about 3 weeks, but you can complete it in several days (several hours/days).

In my case, I spent one week on learning Swift. So, if you have time, there are several following resources you can explore:

从 Swift 开始

你也可以学习 Objective-C,但我真心推荐你从 Swift 开始。它很友好而且易学。

我最先在苹果官方资源获取学习资源。通读基本概念,然后在 XCode 中着手尝试那些代码。

此外,你可以试试 Udacity 上的 Swift 学习课程。虽然网站上说需要 3 周,但实际可以在几天内完成(甚至几小时)。

我花了一周学习 Swift。如果你有时间,可以去看看下面这几个资源:

Draw your app interface with UIKit

Let’s move to a visual and interesting part. UIKit helps your work to be seen and interacted on iOS devices. It sounds good, doesn’t it.

In my case, I went to search for a free course on Udacity. Fortunately, I found it. UIKit Fundamental Course

At first, iOS Auto Layout was quite strange to me.The reason was that when developing Android apps, I used to implementing its interface via layout xml files and saw the result visually, almost never used drag-and-drop features. iOS, however, is totally different. 
After spending a while on practicing to understand Auto Layout mechanism, it was pretty awesome that I learnt something else beyond usual Android design style.

Besides, in Xcode, you can make transition between screens by just using dragging their connection in Storyboard, while Android requires some lines of code.

There are various features that you can explore.

Furthermore, you can check out more iOS UIKit tutorials in “Core Concepts” section of iOS Raywenderlich page.

使用 UIKit 绘制应用界面

现在来到可视化部分。UIKit 使工作内容在 iOS 上呈现,并与 iOS 设备互动。

我在 Udacity 上搜索免费的 UIKit 基础课程

起初,我觉得 iOS 自动布局非常奇怪。在开发 Android 应用的时候,我通常在 xml 文件中布局界面,其结果是可以看到的,几乎不需要使用拖放功能。然而 iOS 完全不同。我花了一些时间,通过实践了解自动布局机制之后,我学到了超越常规 Android 设计风格的东西。

此外,在 XCode 中制作屏幕过渡只需要向 Storyboard 中拖入它们的连接,这在 Android 需要一些代码才能实现。

你可以探索其各种不同的特性。

而且,你可以在 iOS Raywenderlich 页面的“核心概念”中找到更多 iOS UIKit 教程。

Understand iOS data persistence

At the time you become familiar with UIKit, you can display data to users and retrieve data from them. It is great.

Next move is to store data that users can get them back even the app is closed. What I mean here is to keep data in user’s device hard drive but not in a remote server.

In iOS apps, you have several options:

  • NSUserDefaults : is a key-pair type that is similar to SharePreferences in Android)

  • NSCoding / NSKeyedArchiver : serializes compliant classes to and from a data representation and stores it in File System or via NSUserDefaults

  • Core Data : is iOS super-powerful framework

  • Others: SQLite, Realm, and etc.

Now many iOS developers prefer Realm over Core Data but I recommend to learn Core Data because it is the iOS official persistent framework and when you understand its core structure and implementation, you can move the mountain.

The resources that I went through includes:

理解 iOS 的数据持久化

熟悉 UIKit 之后,你可以向用户展示数据并从他们那接收数据。

下一步是存在数据,让用户即使在应用关闭后重新打开也能获得这些数据。意思就是把数据保存在用户设备的硬盘中,而不是远程服务器中。

iOS 应用中你有几个选择:

  • NSUserDefaults:键值对类型,就像 Android 中的 SharePreferences

  • NSCoding / NSKeyedArchiver:在兼容类和数据持久之间进行序列化并通过 NSUserDefaults 保存到文件系统中

  • Core Data:iOS 超强大的框架

  • 其它:SQLite、Realm 等

与 Core Data 相比,现在很多 iOS 开发者都更喜欢 Realm。不过我推荐学习 Core Data,因为它是 iOS 官方推出的持久化框架,只要你理解了它的核心结构和实现,就可以举一反三。

我曾经使用过的资源包括:

Get in touch with outside world via iOS networking

We are living in internet era, so your app should connect with the outside world and exchange information with others. Let’s move to the next lesson: iOS networking. You learn to work with REST API in iOS. It is important thing to remember that you should not use any third-party libraries at the moment. Let’s complete this lesson in iOS built-in frameworks.

In the future you have a lot of chances to work with cool http networking libraries like Alamofire , but we are learning now. Going with basic and official things before swimming into others.

Recommended courses and tutorials:

iOS 通过网络与外界接触

我们生活在互联网时代,所以你的应用应该开放并与外界交换信息。现在进入下一课:iOS 网络。在这里学习 iOS 中的 REST API。有一件很重要的事情要记住:这时候你不能使用任何第三方库。我们将使用 iOS 内建的框架来完成这个课程。

将来你有很多机会用到炫酷的网络库,比如 Alamofire,但我们现在应该先学习基本的知识。

推荐的课程和教程:

Build your first awesome app

“Knowing is not enough. Let’s apply”.?—?Leonardo da Vinci

You have many tools in your hand after following your iOS self-studying journey. You can program in Swift, sketch iOS app interface by using Story board and UIKit, persist data on device’s storage, and exchange information with the world via internet by using iOS Networking.

You are awesome, man. Let’s build whatever you want.

We are developers who make cool and valuable stuffs to make our tough world easier. So, you can try to build iOS app that improve your daily work, help your little brother, or even solve a global problem. Finally, I recommend that you publish it on Apple store. It helps you feel good and keep going on.

构建第一个应用

    “光知道是不够的,我们要应用知识。”—达·芬奇

经历了 iOS 自学之旅之后,你手头会有很多工具。你会使用 Swift 编程,会使用 Storyboard 和 UIKit 绘制 iOS 应用界面草图,会把数据保存到设备的存储器中,还会使用 iOS 网络技术通过互联网与世界进行信息交换。

你很棒,亲。来构建你想要的一切。

开发者创建酷且有价值的东西,给全世界的人们带来便利。你可以试着构建 iOS 应用,改善你的日常工作,帮助你的小伙伴解决难题。最后,我推荐你把它发布到苹果应用商店。它能时刻激励你前行。

3 years ago, I published my first Android app (a note-taking app) on Google Play after learning Android for 1 months. 1 years ago, I also published my first iOS app (a weather app) on Apple Store after 1 month self-studying. They were both simple stupid at first, but they kept me being motivated and improving day by day.

You are better and I bet on it. So, let’s create something and show it to the world.

Note: There are many good resources out there, you can pick them up by searching Google. The tutorials and courses above are just my favorite selection.

3 年前,我在 Google Play 上发布了我的第一个 Android 应用(一个笔记应用),这是学习 Android 一个月的成果。1 年前,我在苹果商店发布了我的第一个 iOS 应用,也是在一个月的自学之后。它们一开始都不太好,但它们让我一天比一天更有动力。

我相信你能做得比我更好,来创造一些东西,然后展示给整个世界吧!

说明可以通过 Google 搜索到大量不错的资源。上面提到的教程的课程只是我的最爱。

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