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")

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. — Martin R
– Martin R, Commented Jun 18, 2015 at 16:48

Community · Accepted Answer · 2017-05-23 12:02:23Z

3

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.

edited May 23, 2017 at 12:02

CommunityBot

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answered Jun 18, 2015 at 19:02

Noe Miranda Franco

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Comments

iAnurag · Accepted Answer · 2015-06-18 16:42:49Z

-1

Simply import your class containing this method in YourProjectname-Bridging-Header.h file.
```
 #import "`YourClass.h"
```
Create imported class's object
```
 var a = YourClass()
```
then simply call the method and pass required parameter
```
a.getNsLog(yourParameters)
```

I hope this helps

answered Jun 18, 2015 at 16:42

iAnurag

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1 Comment

Noe Miranda Franco Over a year ago

I make it but only this function not is recognized

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