How call a function objective c with args in swift

Question

I have the next function in objective c

+ (NSString *)getNsLog:(NSString *)pString, ...{
 va_list args;
 va_start(args, pString);
 NSLogv(pString, args);
 va_end(args);
 return [[NSString alloc] initWithFormat:pString arguments:args]; 
}

how can I call this function from swift or convert the code to swift such that when I call the function can be:

getNslog("my value1 = %@ value2 = %@","hello","world")

Note that the second param not have alias how this.

getNslog("my value1 = %@ value2 = %@", args:"hello","world")

• Martin R: Possible duplicate of How do you call an Objective-C variadic method from Swift?. – Summary: You cannot call a function with a variable argument list from Swift, only functions taking a va_list parameter.

Answer 1

I solved follow:

in objective c change my code to this:

+(NSString*)getNsLog:(NSString*)pString args:(va_list)args{
NSLogv(pString, args);
va_end(args);
return [[NSString alloc] initWithFormat:pString arguments:args];
}

in swift app delegate I add

extension MyClass {
class func getNsLog(format: String, _ args: CVarArgType...) -> NSString?
 {
 return MyClass.getNsLog(format, args:getVaList(args))
 }
}

now I can call the function

NSLog("%@", MyClass.getNsLog("%@,%@", "hello","World")!)

I based in the post duplicated How do you call an Objective-C variadic method from Swift?

thanks.

Answer 2

1. Simply import your class containing this method in YourProjectname-Bridging-Header.h file.

    #import "`YourClass.h"
   

2. Create imported class's object

    var a = YourClass()
   

3. then simply call the method and pass required parameter

   a.getNsLog(yourParameters)
   

I hope this helps

• Noe Miranda Franco: I make it but only this function not is recognized