CODEWITHSUNDEEP
iosobjective-c
Iatrochemist
Iatrochemist

Reputation: 276

Objective C frame animation

Im reading a tutorial to animate sprite sheet frames in objective-C, code below shows how to allocate and initialize a mutable array and loop through it using a for loop.

NSMutableArray *frames = [[NSMutableArray alloc]init];
    for (int i=0; i<=10; i++) {
        NSString *frameName = [NSString stringWithFormat:@"a%04i.png",i];
    }

i can't understand how this piece of code works :

:@"a%04i.png",i

note that i have sprites name like this : a0001.png till ,a0031.png. simply tell me how a%4i works here ? thanks

Upvotes: 1

Views: 101

Answers (1)

Basheer_CAD
Basheer_CAD

Reputation: 4919

the translation is not very hard: 

:@"a%04i.png",i  

@"a" + @"integerWith4digits" + @".png" == @"a0000.png";

i.e. if the integer is 1 then complete the integer by adding 3 zeros (0001), if the integer is 1111 or 1111..., then do nothing

Upvotes: 2

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