What's a more efficient way of listing animation images?

Question

In the lesson each image of the animation is listed in the array, like so:

self.backgroundImageView.animationIamges = @[[UIImage imageName:@"01"], [UIImage imageName:@"02"], [UIImage imageName:@"03"]];

There's 60 images for the animation, which means 60 lines of code. There definitely has to be an easier way to achieve this. If so, what is it?

Also side note, what's the formatting label for Objective C on this forum?

Answer 1 · 2014-07-19T06:14:09Z

July 19, 2014 6:14am

I was going to say that it would probably be pretty easy to throw together a for-loop to do that using the addObject: and stringWithFormat: methods, but the animationImages property is not a mutable array. Therefore, a for loop wouldn't work unless you made a temporary mutable array and then instantiated animationImages with that array, like so

// make a temporary, mutable array
NSMutableArray *tempArray = [NSMutableArray array];
    for (int i = 1; i < 61; i++) {
        if (i < 10) {
            // create a string with the image's name
            NSString *imageName = [NSString stringWithFormat:@"CB0000%d", i];
            // add the image to the array
            [tempArray addObject:[UIImage imageNamed:imageName]];
        }
        else {
            NSString *imageName = [NSString stringWithFormat:@"CB000%d", i];
            [tempArray addObject:[UIImage imageNamed:imageName]];
        }
    }

    self.backgroundImageView.animationImages = [NSArray arrayWithArray:tempArray];

Note: The if/else statement is to make the correct imageName. If I is less than 10, there is an extra zero proceeding the number. Another note: This is probably terribly memory inefficient and you shouldn't do it. Just collapse your code or figure out a better way.

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Vlatko .

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What's a more efficient way of listing animation images?

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Rutger Farry

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Mike Lange

Mike Lange