How to add string and array - ios

Question

NSString *butterfly = [NSString stringWithFormat:#"brush_%d.png", i]
I want that string in separate like this
brush_
%d.png
Because i have lot of animation function are there in my project(0 to 39).
if(counter == 0) {
NSMutableArray *dashBoy = [NSMutableArray array];
for (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];
for (i = 1; i <= 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 this but it's not correct
NSArray *c = [NSArray arrayWithObjects:#"brush", #"catch", #"clap",#"dog", nil];
//NSString *str = #"brush_";
NSString *str = [c componentsJoinedByString:#""];
for (int i=0; i<=3;i++)
str = [str stringByAppendingFormat:#"_%i.png ",i];
NSLog(#"%#",str); //Output is brushcatchclapdog_0.png _1.png _2.png _3.png
I want
brush_0.png, catch_1.png, clap_2.png in array
Here i want to combine in one function using for loop above category.It is possible to get one function to combine the above 39 animation function.

Answer 1

[self animateWithCategory:#"brush_" WithCount:13 duration:0.2f]
-(void)animateWithCategory:(NSString *)strCategory WithCount:(CGFloat)count duration:(NSInteger)duration{
NSMutableArray *dashBoy = [NSMutableArray array];
for (int i = 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];
}

Answer 2

As per your desired output:
I want
brush_0.png, catch_1.png, clap_2.png in array
you can try like this:
NSArray *c = [NSArray arrayWithObjects:#"brush", #"catch", #"clap",#"dog", nil];
NSMutableArray *o = [[NSMutableArray alloc] initWithCapacity:[c count]];
//NSString *str = #"brush_";
//NSString *str = [c componentsJoinedByString:#""];
for (int i=0; i<=3;i++)
{
NSString *str = [[c objectAtIndex:i] stringByAppendingFormat:#"_%i.png ",i];
NSLog(#"%#",str); //Output is brushcatchclapdog_0.png _1.png _2.png _3.png
[o addObject:str];
}//brush_0.png, catch_1.png, clap_2.png in array
NSLog(#"Output array : %#", o);
Logged output of the code:
2014-02-07 00:31:29.020 DesignMantic[807:70b] brush_0.png
2014-02-07 00:31:29.023 DesignMantic[807:70b] catch_1.png
2014-02-07 00:31:29.024 DesignMantic[807:70b] clap_2.png
2014-02-07 00:31:29.025 DesignMantic[807:70b] dog_3.png
2014-02-07 00:31:29.026 DesignMantic[807:70b] Output array : (
"brush_0.png ",
"catch_1.png ",
"clap_2.png ",
"dog_3.png "
)