how using NSPredicate (many args) in wax

[Dave Wang]

hi,anybody!

     Using NSPredicate in lua that is not working!

      eq:

Objective-c Code 

     NSPredicate *p = [NSPredicate predicateWithFormat:@"SELF MATCHES %@ ",@"[0-9]{0,25}+$"];

    if ( [p evaluateWithObject:@"121"]) {

         NSLog(@"p");

    }else{

    NSLog(@"not p");

    }

Lua Code 

   

    local pred= NSPredicate:predicateWithFormat(toobjc("SELF MATCHES %@ "),toobjc("[0-9]{0,25}+$"));

 

       is not work!!! Help me!

[Benjamin Tolputt]

iPhone Wax doesn't deal well (or really, at all) with variable argument functions like predicateWithFormat. When it comes to things like this, I write a quick wrapper in Obj-C and use that in the Lua code. Something like this should work:

Obj-C

@implementation NSPredicate (LuaHacks)

+ (NSPredicate *)predicateWithFormat:(NSString *)format varArg1:(NSString*)varArg1

{

return [NSPredicate predicateWithFormat:format, varArg1];

}

then, in Lua, you use it as:

local pred = NSPredicate:predicateWithFormat_varArg1("SELF MATCHES %@ ", "[0-9]{0,25}+$")

Hope this helps

[Dave Wang]

Thinks!