ios - Calling swift function from objective c gives linker error -

i trying call swift function objective c file.

swift function implementation:

@objc class fxformvariables : nsobject {     class func fxfontname() -> string { return fontname }     class func fxfontsize() -> cgfloat { return fontsizelarge }     class func fxhiddencell() -> nsarray { return hiddenelementfromformindex nsarray } } 

objective c:

nsarray *hidearray = [fxformvariables fxhiddencell]; if ([hidearray containsobject:@(cellindexpath)]){         return 0.0; } 

linker error in buildtime:

 undefined symbols architecture x86_64:   "_objc_class_$__ttcc13social_engine11appdelegate15fxformvariables", referenced from:       objc-class-ref in fxforms.o ld: symbol(s) not found architecture x86_64 clang: error: linker command failed exit code 1 (use -v see invocation) 

this code works fine in xcode 7.3 after upgrade 8.3 start throwing linker error.

please help. in advance.

import file named project name appending -swift.h in objective-c file

please check below example of import file

#import “projectname-swift.h” 

xcode generate file when build project .swift files.

also, can check below question: how import swift code objective-c