What is Foobar-umbrella.h for?

Question

Assuming I got a Framework called Foobar. When I try compiling my iOS project I get the compiler warning:

Umbrella header for module 'Foobar' does not include header 'Foobar-umbrella.h'

I don't get what this 'Foobar-umbrella.h' is and why it isn't included. Some details about my project:

• An iOS 8 App project mostly written in Swift. A little bit Objective-C
• The 'Foobar' framework is a separate project mostly written in Swift which I have included as a subproject to my main project.
• It has been included by embedding it in build phases and depending on it. But I am not explicitly linking against it.
• I use Cocoapods, but 'Foobar' is not included as a pod.

Answer 1

The umbrella header is the 'master' header file for a framework. Its use is that you can write

#import <UIKit/UIKit.h>

instead of

#import <UIKit/UIViewController.h>
#import <UIKit/UILabel.h>

#import <UIKit/UIButton.h>
#import <UIKit/UIDatePicker.h>

and so on.

For me, <XCTest/XCTestCase+AsynchronousTesting.h> is included in <XCTest/XCTest.h>. Maybe it is not for you? In that case, add the

#import <XCTest/XCTestCase+AsynchronousTesting.h>

manually.