Question

I am doing a children’s book using Leaves. I want to have a different animated image and sound play for each page. I have figured out how to do the animation, I have it in a method that i can pass all the animation objects for each page. But each page is so different that I am ending up writing a different method for each page. I have a pageNum var that I want to call each pages method page 5 animation method would be -(void)animatePage5, and so on.

But I can not figure out how to build the method call so that it has the pageNum object in it.

I know this is easy, but I just can not find an answer on google, or stack overflow.

I might be too close to the forest to see the trees.

What is the simple, best practice for this type of method call.

Thanks for helping out a noob….

Answer 1

You could use a switch statement to redirect the method call to the right method:

-(void)animagePage:(int)pagenum
{
    switch (pagenum) {
        case 1: [self animatePage1]; break;
        case 2: [self animatePage2]; break;
        case 3: [self animatePage3]; break;
        ...
        case 25: [self animatePage25]; break;
    }
}

Or you can create a string and then convert it to a @selector:

NSString* methodName = [NSString stringWithFormat:@"animatePage%d", pagenum];
SEL aSelector = NSSelectorFromString( methodName );
[self performSelector:aSelector];