How to build universal ios static library

Question

I'm trying to build a static library that I can use with both ios3.x and ios4.x. I can build a static library with ios3.0 that works with another project in ios3.0 but won't compile in ios4. The same is true going from ios4 to ios3. Here's how to recreate: - Open XCode 3.2.4 and start a new project that's a Cocoa Touch Static Library called Library4 - Click on the classes folder and create a new UIViewController named "TestViewController" - Right click on Frameworks folder, add existing framework, pick UIKit - In the left panel, expand targets, right-click on my library target and click get info. Change to all configurations, Change the base sdk to iphone simulator 4.0, change ios deployment target to ios3.0 - Click on the Link Library with Binaries folder. In the right pane, change the roles of both to "Weak" - Build the Library - Open Xcode 3.2.2 and start a new View based application called Library4Test - Copy TestViewController.h to the classes folder - Copy libLibrary4.a file to…

Accepted Answer

Not sure exactly, but it looks like a linking problem (all those .o things). Here's how I set up my iOS static library. It's a very simple thing, but it works.

- Start a new project and choose iOS Libarary >> Cocoa Touch Static Library

- Add some classes. Mine are categories on UIView that give better descriptions for use in NSLog.

- Select the target and make sure the Role of each class is set to an appropriate value. In the case of my categories that should be 'public'.

- Double-click on the target and choose the Build tab.

- Select the Configuration Release and set the following build settings:

- Deployment Location YES (check) Deployment Postprocessing YES (check) Installation Build Products Location /

Build your static library. By default it will build in /usr/local/lib

Now create a symbolic link for easy access to your new library. An easy way is to open your terminal and run the following commands:

```
cd ~    
ln -s /usr/local/lib
```

Now open the Xcode project in which you want to use your library. Create a group called Libraries or something like that, ctrl-click and use 'Add existing files' to add the library. It will be called something like libYourLibrary.a When you run your project, you'll get a linking error. So double-click the project file, go to Build >> All configurations and add the following value to the "Library Search Paths" setting: ~/lib

How to build universal ios static library

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