How to include header file only if framework is added/linked in Xcode?

Question

I'm working on a Xcode project with Objective C that has optional frameworks which means that some code is executed from that particular framework only if it is linked/exists in project. The current framework that I'm using is PassKit. How can I achieve this? Is there some macro that can tell is framework linked or it is not? Something like this, but it doesn't work:

#if __has_include("PassKit.h") && __has_include(<PassKit.h>)
#import <PassKit/PassKit.h>
#endif

- (void)viewDidAppear:(BOOL)animated {
     if ([PKPassLibrary class]) {
         UIAlertController *alert = [UIAlertController
                                alertControllerWithTitle:@"PassKit Test"
                                message:@"PassKit is linked."
                                preferredStyle:UIAlertControllerStyleAlert];

      UIAlertAction* okButton = [UIAlertAction
                               actionWithTitle:@"Ok"
                               style:UIAlertActionStyleDefault
                               handler:^(UIAlertAction * action) {
                                   NSLog(@"Ok pressed...");
                               }];

       [alert addAction:okButton];

       [self presentViewController:alert animated:YES completion:nil];
   }}

Also I have set Link Frameworks Automatically to NO in my target. Thanks for your answers and help.

Include it normally, but check if the function is available before using. Possibly a duplicate of: stackoverflow.com/questions/33038137/… — Sealos
– Sealos, Commented Dec 21, 2016 at 13:56
I still don't get it how I can use this... Is weak_import in this function extern int MyWeakLinkedFunction() __attribute__((weak_import)); parameter for framework name? How can I connect this with PassKit? — MattCodes
– MattCodes, Commented Dec 21, 2016 at 14:12
I need something that will tell me if framework exists during run time. If framework exists, it will run code. — MattCodes
– MattCodes, Commented Dec 21, 2016 at 14:37
I found a solution. I've implemented this method: - (BOOL)checkIfFrameworkIsLinked:(NSString *)className { BOOL isFrameworkLinked = (NSClassFromString(className) != nil); return isFrameworkLinked; } and it works fine. — MattCodes
– MattCodes, Commented Dec 21, 2016 at 14:55
Hello, can I do that with frameworks written in swift? we have been struggling for a week.. here is our problem, can you help? stackoverflow.com/questions/55077857/… — Viktor Vostrikov
– Viktor Vostrikov, Commented Mar 9, 2019 at 20:20

Zhiping Yang · Accepted Answer · 2018-01-19 02:20:53Z

3

#if __has_include(<PassKit/PassKit.h>) || __has_include("PassKit.h")
#define XXXPKTrigger
#endif

- (void)viewDidAppear:(BOOL)animated {
#ifdef XXXPKTrigger
    UIAlertController *alert = [UIAlertController
                                alertControllerWithTitle:@"PassKit Test"
                                message:@"PassKit is linked."
                                preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* okButton = [UIAlertAction
                               actionWithTitle:@"Ok"
                               style:UIAlertActionStyleDefault
                               handler:^(UIAlertAction * action) {
                                   NSLog(@"Ok pressed...");
                               }];

    [alert addAction:okButton];
    [self presentViewController:alert animated:YES completion:nil];
#else
// do another logic
#endif
}

answered Jan 19, 2018 at 2:20

Zhiping Yang

3893 silver badges7 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

peacetype Over a year ago

While this code snippet may be the solution, including an explanation really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion.

Viktor Vostrikov Over a year ago

Hello, can I do that with frameworks written in swift? we have been struggling for a week.. here is our problem, can you help? stackoverflow.com/questions/55077857/…

Collectives™ on Stack Overflow

How to include header file only if framework is added/linked in Xcode?

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related