Implicit declaration of function 'UI_USER_INTERFACE_IDIOM' is invalid in C99












1















In Swift and Objective c Hybrid project(link https://github.com/shohagHub/Constants) I have an Objective C file Constants.h



Where I Declare a macro #define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)



When I returned this macro from a method



-(BOOL)isIphone{
return IS_IPHONE;
}


The Following build error occurs
"Implicit declaration of function 'UI_USER_INTERFACE_IDIOM' is invalid in C99"



How Can I remove this error.










share|improve this question





























    1















    In Swift and Objective c Hybrid project(link https://github.com/shohagHub/Constants) I have an Objective C file Constants.h



    Where I Declare a macro #define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)



    When I returned this macro from a method



    -(BOOL)isIphone{
    return IS_IPHONE;
    }


    The Following build error occurs
    "Implicit declaration of function 'UI_USER_INTERFACE_IDIOM' is invalid in C99"



    How Can I remove this error.










    share|improve this question



























      1












      1








      1








      In Swift and Objective c Hybrid project(link https://github.com/shohagHub/Constants) I have an Objective C file Constants.h



      Where I Declare a macro #define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)



      When I returned this macro from a method



      -(BOOL)isIphone{
      return IS_IPHONE;
      }


      The Following build error occurs
      "Implicit declaration of function 'UI_USER_INTERFACE_IDIOM' is invalid in C99"



      How Can I remove this error.










      share|improve this question
















      In Swift and Objective c Hybrid project(link https://github.com/shohagHub/Constants) I have an Objective C file Constants.h



      Where I Declare a macro #define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)



      When I returned this macro from a method



      -(BOOL)isIphone{
      return IS_IPHONE;
      }


      The Following build error occurs
      "Implicit declaration of function 'UI_USER_INTERFACE_IDIOM' is invalid in C99"



      How Can I remove this error.







      objective-c swift xcode






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 24 '18 at 7:18







      Saleh Enam Shohag

















      asked Nov 24 '18 at 6:42









      Saleh Enam ShohagSaleh Enam Shohag

      199114




      199114
























          2 Answers
          2






          active

          oldest

          votes


















          2














          please add to your Constants.h
          #import <UIKit/UIKit.h>

          it will work






          share|improve this answer
























          • Thanks it worked perfectly. How could i miss that!!! :)

            – Saleh Enam Shohag
            Nov 25 '18 at 9:01



















          1














          Does your file import UIKit? No, it doesn't. Your Constants.h file imports Foundation, not UIKit. Import UIKit instead and your code will compile.



          But also note: the docs on UI_USER_INTERFACE_IDIOM expicitly say:




          If your app runs in iOS 3.2 and later, use userInterfaceIdiom instead.




          So here's a better rewrite of your entire Constants.h file:



          #import <UIKit/UIKit.h>

          @interface Constants : NSObject
          #define IS_IPHONE ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone)
          -(BOOL)isIphone;
          @end





          share|improve this answer


























          • yes i import the Foundationo

            – Saleh Enam Shohag
            Nov 24 '18 at 8:52











          • Thanks your edited solution is a smart one.

            – Saleh Enam Shohag
            Nov 25 '18 at 9:06











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          2 Answers
          2






          active

          oldest

          votes








          2 Answers
          2






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














          please add to your Constants.h
          #import <UIKit/UIKit.h>

          it will work






          share|improve this answer
























          • Thanks it worked perfectly. How could i miss that!!! :)

            – Saleh Enam Shohag
            Nov 25 '18 at 9:01
















          2














          please add to your Constants.h
          #import <UIKit/UIKit.h>

          it will work






          share|improve this answer
























          • Thanks it worked perfectly. How could i miss that!!! :)

            – Saleh Enam Shohag
            Nov 25 '18 at 9:01














          2












          2








          2







          please add to your Constants.h
          #import <UIKit/UIKit.h>

          it will work






          share|improve this answer













          please add to your Constants.h
          #import <UIKit/UIKit.h>

          it will work







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 24 '18 at 20:31









          JackJack

          536




          536













          • Thanks it worked perfectly. How could i miss that!!! :)

            – Saleh Enam Shohag
            Nov 25 '18 at 9:01



















          • Thanks it worked perfectly. How could i miss that!!! :)

            – Saleh Enam Shohag
            Nov 25 '18 at 9:01

















          Thanks it worked perfectly. How could i miss that!!! :)

          – Saleh Enam Shohag
          Nov 25 '18 at 9:01





          Thanks it worked perfectly. How could i miss that!!! :)

          – Saleh Enam Shohag
          Nov 25 '18 at 9:01













          1














          Does your file import UIKit? No, it doesn't. Your Constants.h file imports Foundation, not UIKit. Import UIKit instead and your code will compile.



          But also note: the docs on UI_USER_INTERFACE_IDIOM expicitly say:




          If your app runs in iOS 3.2 and later, use userInterfaceIdiom instead.




          So here's a better rewrite of your entire Constants.h file:



          #import <UIKit/UIKit.h>

          @interface Constants : NSObject
          #define IS_IPHONE ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone)
          -(BOOL)isIphone;
          @end





          share|improve this answer


























          • yes i import the Foundationo

            – Saleh Enam Shohag
            Nov 24 '18 at 8:52











          • Thanks your edited solution is a smart one.

            – Saleh Enam Shohag
            Nov 25 '18 at 9:06
















          1














          Does your file import UIKit? No, it doesn't. Your Constants.h file imports Foundation, not UIKit. Import UIKit instead and your code will compile.



          But also note: the docs on UI_USER_INTERFACE_IDIOM expicitly say:




          If your app runs in iOS 3.2 and later, use userInterfaceIdiom instead.




          So here's a better rewrite of your entire Constants.h file:



          #import <UIKit/UIKit.h>

          @interface Constants : NSObject
          #define IS_IPHONE ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone)
          -(BOOL)isIphone;
          @end





          share|improve this answer


























          • yes i import the Foundationo

            – Saleh Enam Shohag
            Nov 24 '18 at 8:52











          • Thanks your edited solution is a smart one.

            – Saleh Enam Shohag
            Nov 25 '18 at 9:06














          1












          1








          1







          Does your file import UIKit? No, it doesn't. Your Constants.h file imports Foundation, not UIKit. Import UIKit instead and your code will compile.



          But also note: the docs on UI_USER_INTERFACE_IDIOM expicitly say:




          If your app runs in iOS 3.2 and later, use userInterfaceIdiom instead.




          So here's a better rewrite of your entire Constants.h file:



          #import <UIKit/UIKit.h>

          @interface Constants : NSObject
          #define IS_IPHONE ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone)
          -(BOOL)isIphone;
          @end





          share|improve this answer















          Does your file import UIKit? No, it doesn't. Your Constants.h file imports Foundation, not UIKit. Import UIKit instead and your code will compile.



          But also note: the docs on UI_USER_INTERFACE_IDIOM expicitly say:




          If your app runs in iOS 3.2 and later, use userInterfaceIdiom instead.




          So here's a better rewrite of your entire Constants.h file:



          #import <UIKit/UIKit.h>

          @interface Constants : NSObject
          #define IS_IPHONE ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPhone)
          -(BOOL)isIphone;
          @end






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 25 '18 at 4:51

























          answered Nov 24 '18 at 6:48









          mattmatt

          328k46530731




          328k46530731













          • yes i import the Foundationo

            – Saleh Enam Shohag
            Nov 24 '18 at 8:52











          • Thanks your edited solution is a smart one.

            – Saleh Enam Shohag
            Nov 25 '18 at 9:06



















          • yes i import the Foundationo

            – Saleh Enam Shohag
            Nov 24 '18 at 8:52











          • Thanks your edited solution is a smart one.

            – Saleh Enam Shohag
            Nov 25 '18 at 9:06

















          yes i import the Foundationo

          – Saleh Enam Shohag
          Nov 24 '18 at 8:52





          yes i import the Foundationo

          – Saleh Enam Shohag
          Nov 24 '18 at 8:52













          Thanks your edited solution is a smart one.

          – Saleh Enam Shohag
          Nov 25 '18 at 9:06





          Thanks your edited solution is a smart one.

          – Saleh Enam Shohag
          Nov 25 '18 at 9:06


















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