Xcode 6 iOS Creating a Cocoa Touch Framework - Architectures issues

Question

I'm trying to make a dynamic framework for an iOS app. Thanks to the new version of Xcode (6) we can select a Cocoa Touch Framework when we create a new project and there is no more need to add an aggregate target, run script and so to make one. I have no issue when i build the framework. But when I'm trying to use it inside an iOS app I get some architectures issues.

ld: warning: ignoring file /Library/Frameworks/MyFramework.framework/MyFramework, file was built for x86_64 which is not the architecture being linked (arm64): /Library/Frameworks/MyFramework.framework/MyFramework
Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_MyFrameworkWebService", referenced from:
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

ld: warning: ignoring file /Library/Frameworks/MyFramework.framework/MyFramework, file was built for x86_64 which is not the architecture being linked (armv7): /Library/Frameworks/MyFramework.framework/MyFramework
Undefined symbols for architecture armv7:
  "_OBJC_CLASS_$_MyFrameworkWebService", referenced from:
      objc-class-ref in AppDelegate.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Well I have tried to change the settings of the framework project and target (Architectures & Build valid architecture only & Valid architectures). I've done the same thing for the iOS app project but nothing works. I think there is something I didn't understand.

For example when I build a framework for only i386 (iOS Simulator) check with the command line "xcrun lipo -info MyFramework", I have an issue that

ld: warning: ignoring file /Library/Frameworks/MyFramework.framework/MyFramework, file was built for x86_64 which is not the architecture being linked (i386)...

If someone can help me to get a framework that works for all iOS architectures including simulators.

Answer 1

Based on all the responses, the post on raywenderlich.com and the gist created by Chris Conway I came up with this.

Executing the following steps I was able to build a Cocoa Touch framework (including Swift and Objective-C files) that contains all architectures for both simulator and device:

1. Create a new (Aggregate) target in your framework's project
2. Under "Build Phases" select "Add Run Script" and copy the contents of this file
3. Select the Aggregate target in the Scheme Selection drop down
4. Build the target for the aggregate scheme

Hope it helps :)

UPDATE: Fixed an error in the gist where the paths in step #3 were incorrect. Thanks to Tokuriku!!

UPDATE In Xcode 7 and 8, click File>New>Target... and there select "Other" group to select Aggregate target