ios - How to add string and array -

nsstring *butterfly = [nsstring stringwithformat:@"brush_%d.png", i] 

i want string in separate

1. brush_
2. %d.png

because have lot of animation function there in project(0 39).

if(counter == 0) {     nsmutablearray *dashboy = [nsmutablearray array];     (i = 1; i<= 13; i++) {         butterfly = [nsstring stringwithformat:@"brush_%d.png", i];         if ((image = [uiimage imagenamed:butterfly]))             [dashboy addobject:image];     }      [stgimageview setanimationimages:dashboy];     [stgimageview setanimationduration:2.0f];     [stgimageview startanimating]; }  . .  if(counter == 39) {     nsmutablearray *dashboy1 = [nsmutablearray array];     (i = 1; <= 30; i++) {         butterfly = [nsstring stringwithformat:@"catch_%d.png", i];         if ((image = [uiimage imagenamed:butterfly]))             [dashboy1 addobject:image];     }      [stgimageview setanimationimages:dashboy1];     [stgimageview setanimationduration:7.20f];     [stgimageview startanimating]; } 

i tried it's not correct

nsarray  *c = [nsarray arraywithobjects:@"brush", @"catch", @"clap",@"dog", nil];  //nsstring *str = @"brush_"; nsstring *str = [c componentsjoinedbystring:@""]; (int i=0; i<=3;i++)     str = [str stringbyappendingformat:@"_%i.png ",i];     nslog(@"%@",str); //output brushcatchclapdog_0.png _1.png _2.png _3.png  

i want

brush_0.png, catch_1.png, clap_2.png in array 

here want combine in 1 function using loop above category.it possible 1 function combine above 39 animation function.

    [self animatewithcategory:@"brush_" withcount:13 duration:0.2f]  -(void)animatewithcategory:(nsstring *)strcategory withcount:(cgfloat)count duration:(nsinteger)duration{         nsmutablearray *dashboy = [nsmutablearray array];         (int = 1; i<= count; i++) {            nsstring* butterfly = [nsstring stringwithformat:@"%@%d.png",strcategory ,i];             uiimage *image=[uiimage imagenamed:butterfly];             [dashboy addobject:image];         }          [stgimageview setanimationimages:dashboy];         [stgimageview setanimationduration:duration];         [stgimageview setanimationrepeatcount:1];         [stgimageview startanimating];     }