This guide is for building muliple targets/apps for a single project, follow-up of an old post in 2009.
If you have 2 or more versions of the same app eg. a lite and a pro version, or many versions of the same map app but for different country, then this guide is for you.
Let’s use the scenario of an “Awesome” app, which I want to create “Awesome Lite”.

這篇教程針對單個工程創建多個Targets/Apps，是2009年一篇舊博文的后續.
如果同一個應用有兩個或兩個以上版本，例如精簡版和專業版，或是一個針對不同國家開發的多版本地圖應用，那么這篇教程就非常適合你.

1. Create New Target

• Go to Project > Targets > Select the original target “Awesome” > Right click > Duplicate.
  When duplicating a target, the default generates “Awesome copy” .app, .plist, etc. We want to change that.

• Rename the new target (select and press enter to edit) to “Awesome Lite”.

• Under Build Settings, search for “Awesome copy”. You need to rename Product Name to “Awesome Lite”, and rename Info.plist to “Awesome Lite-info.plist”.

• In your project, find “Awesome copy-info.plist”, and rename to “Awesome Lite-info.plist”. After renaming, you would need to delete the “missing one” in your project navigator, and drag the new one in, and select the correct target (Awesome Lite) to copy for.
  Pitfall: Take note of the path for the plist. If you place it in the root folder of the project, then you can just specify the name (no need the path). If not, specify the full path$(PROJECT_DIR)/path/to/Info.plist.

• Project >Targets > 選擇Target"Awesome" > 右擊 > 復制.
  當復制Target后，默認會生成一個"Awesome copy".app, .plist, etc. 我們需要修改它.

• 重命名新的Target（選中并輸入）"Awesome Lite".
• Build Setttings 中搜索"Awesome copy", 重命名Product Name 為"Awesome Lite", Info.plist 為"Awesome Lite-info.plist".
• 工程中找到"Awesome copy-info.plist",將其重命名為"Awesome Lite-info.plist". 重命名后，你需要刪除工程導航欄中"missing"的文件，把新的plist拖入，并選擇正確的Target（Awesome Lite）復制. (備注：筆者在此并沒發現需刪除的"missing one").
  小坑：留意plist的路徑，如果你把它放在工程的根文件中，那么你只需要修改文件名即可（無需路徑）；如果不是，就需指定全局路徑 $(PROJECT_DIR)/path/to/Info.plist.

2. Edit Scheme

Go to Product > Scheme > Edit Scheme > change the scheme “Awesome copy” to “Awesome Lite”.
At this point, you should now be able to build and run the new scheme (even though it is exactly the same as the original target). We will modify the lite version from this point onwards.

Product > Scheme > Edit Scheme > 將scheme "Awesome copy"修改為"Awesome Lite".
現在你就可以編譯運行新的scheme了(雖然它和原Target一模一樣).我們將開始修改精簡版信息了。

3. Edit Info.plist

Go to the new target > Info > edit these accordingly:
Bundle Display Name
Bundle Name
Bundle Identifier

找到新Target > Info ，然后修改以下信息：
Bundle Display Name
Bundle Name
Bundle Identifier

4. Writing Preprocessor Codes

Preprocessor codes are used to determine which code would be used during compile time. You may want different targets to run different section of the codes using preprocessor codes.

#ifdef TARGET_LITE
NSLog(@"Lite Verison");
#else
NSLog(@"Original Version");
#endif

Select “Awesome Lite” target > Build Settings > Preprocessing > Preprocessor Macros > Add TARGET_LITE to each of the configuration (eg both Debug and Release configurations).
Warning: You must change for all configurations. The default is Debug and Release, but let’s say you created a “Beta”, then you have to change that too.

在編譯期間預處理代碼被用來檢測那些代碼將會被用到. 通過使用預處理代碼，你可以讓不同target 運行不同代碼塊.
選擇"Awesome Lite"Target > Build Settings > Preprocessing > Preprocessor Macros > 添加TARGET_LITE 到每個配置選項中(包括Debug 和 Release).
注意：你必須修改所有的配置.默認是Debug 和 Release, 但是如果你創建了一個"Beta"，那么你同樣也需要修改它.

5. Resources, Images and Assets Catalog

For any such resources (except Assets Catalog), the trick here is to specify their targets.
Select the resource > File Inspector > Target Membership > check the targets intended.
For Assets Catalog, you have to create for each target because you cannot specify individual target membership for each of the images in it.
You can add “New App Icon” in the new assets catalog, and simply delete the app icon in the old one.

針對所有的資源（除了Assets Catalog外), 重點在于修改他們的Targets.
選擇resource > File Inspector > Target Membership > 勾選對應Targets.
針對Assets Catalog, 你需要為每個Target創建一個新的Assets Catalog，因為你無法針對每張圖片對應修改Target關系.
在新的Assets Catalog 中添加"New App Icon",然后刪除舊的App Icon.

6. If you are using Pods

If you are using CocoaPods, and assets doesn’t work correctly, read this pod issue.
I added the following to my Podfile and it works:

如果你使用CocoaPods, assets 無法正常使用，你可以讀讀這篇博文.
我把以下部分添加到我的Podfile 中，然后一切正常.

1 # Append to Podfile
2 post_install do |installer|
3 installer.project.targets.each do |target|
4 %x~ if [ ! -f Pods/#{target.name}-resources.sh.bak ]; then cp Pods/#{target.name}- resources.sh Pods/#{target.name}-resources.sh.bak; fi ~
5
6 %x~ sed '/WRAPPER_EXTENSION/,/fi\\n/d' Pods/#{target.name}-resources.sh > Pods/#{target.name}-resources.sh.temp ~
7 %x~ sed '/*.xcassets)/,/;;/d' Pods/#{target.name}-resources.sh.temp > Pods/#{target.name}-resources.sh ~
8 %x~ rm Pods/#{target.name}-resources.sh.temp ~
9 end
10 end

Tips: I haven't tested sixth, so if you get any problems ,please let me know it. :-)

This post comes from : Junda Ong - Create Multiple Targets/Apps for 1 Xcode Project .