【導讀】iOS開發(fā)是所有開發(fā)中最令人激勵，有趣，回報高，極具挑戰(zhàn)性的。這就意味著有很多可以做的，成長很多，變化很多，還可以從蘋果，論壇還。有其他開發(fā)者，書籍，會議等等方面得到很多的支持。的平臺，現(xiàn)在都成為了巨大的市場。這些手機設備給開發(fā)者帶來了更多的機會，iOS讓你能夠同時為兩個平臺做開發(fā)。我們需要一起來了解一些話題，包。括搭建開發(fā)環(huán)境，在本章的最后，你會有你的第一個應用。Xcode是開發(fā)iOS以及OSX應用的主要工具。Objective-C是C的衍生語言，這就意味著所有的C代碼都能夠兼容，在Ojective-C中運行。言不同，Objective-C是面向對象的。記住這本書的目的不是教你學習Objective-C，如果你對這門語。言的學習有問題的話，你可以使用其他的資源來研究Objective-C。蘋果同時提供了很豐富的各種框架。所以自動包含在了Xcode中。iOS剛出來的時候，顯示一個地點的地圖非常難，需要很大的工作。助完成復雜的功能。iOS開發(fā)很大程度上以來Model-View-Controller構架模式。這兩部分對在測試期間顯示各種value和

　　

【正文】 nit tests (see figure ). Click Next and you’ll be presented with a Finder window to specify the location of the project (see figure ). You can also create a local git repository for your project during this step (see the bottom of figure ). Click Create and your project is now ready to develop! Xcode will display your default Target’s summary (see figure ). You’ll be able to see the selections you made. Pay particular attention to the naming convention using the prefix in the Navigator. Note also the Main Storyboard setting of MainStoryboard because you chose to use the Storyboard setting during your app creation. If you hadn’t checked that box, this setting would be empty and you’d have a Main Interface setting instead. The default Main Interface settings would relate to a UI design file with the file extension of xib. Instead, you have a .storyboard file in your project. Most of the projects in this book use XIB files for UI design, but you’ll use Storyboard here. Now let’s look at the file and the UI of your first app. Editing the user interface Before you change your project based on the template, let’s run it. Yep, it’s already in a state where you can pile and run it. Make sure the iPhone Simulator is selected in the scheme pulldown menu on the top left (see figure ) and click Run. Xcode will pile, link, and execute the code using the iOS Simulator. It will only display a blank white screen because your app doesn’t do anything yet. Let’s change that! Click on the Storyboard file in your project (for example, )。 the UI contents will be displayed in the Editor, which, in this case, is Interface Builder for the user interface (see figure ). That white rectangle is the view controller you saw displayed when you ran the project in the simulator. Note the left in the Editor (see figure ). The one listed as View Controller is an instance of your HWViewController class. Therefore, changes to it in the Editor will affect how your app runs. Be sure that Utilities is visible (right button above View on the top right of Xcode) and note that there’s a list of items at the bottom (see figure ). That list on the bottom right contains other UI items that can be dropped onto your UI. Scroll down the list until you see Label. Drag it into the Editor and drop it in the big white area of your view controller. Doubleclick on the newly dropped label and type Hello World (see figure ). Now run your app again and … congrats! You have a functioning app! Check out figure to see what your app’s label should look like. Now run your app again and … congrats (see figure )! Summary Great job! Your first app is done! Not so painful, right? Now you’re an iOS developer (although I don’t expect you to make much money from the app you created)! In this chapter, you learned about Xcode? including how to get it and its various parts, areas, views, editors, and so on. Based on that knowledge, we quickly moved into developing a Hello World app to get a taste of iOS development. But that’s only the start. I’m sure you’ve seen the amazing things that iOS apps can do? so you know there’s so much more possible than what you’ve done so far. In the next chapter, you’ll take the next step of including user interaction in your Hello World app. There’s no limit to what you can do, so let’s dive in!