How do I create new instances of an object in ios?

Question

I'm working on a concept that will have objects falling from the top of the screen. For this example lets say, 4 objects: red square, blue square, green square, yellow square.

I have all of these objects placed in the interface builder and connected with the names given in the .h files: IBObject UIImageView *greenSquare; for example.

I able to interact with the "greenSquare" fine and have it fall from the top of the view to the bottom and disappear off the view. Right now I want to be able to recreate the "greenRectangle" and have it fall again. I can't just reset that one instance since at any given point 1 or more of the same object would be falling.

The end result would be x number of the squares of any of the colors would be showing and falling.

I'm sure my workflow for this would be:

• Set time to pick square
• position square
• show square
• drop square at x rate

Any push in the right direction would be great. Thanks everyone!

Answer 1

here is what I did:

in my .h file I created the object instances:

UIImageView *yellowImage;
UIImageView *greenImage;
UIImageView *orangeImage;
UIImageView *redImage;

UIImage *yellow;
UIImage *green;
UIImage *orange;
UIImage *red;

I then set the images:

green = [UIImage imageNamed:@"greenball.png"];
yellow = [UIImage imageNamed:@"yellowball.png"];
orange = [UIImage imageNamed:@"orangeBall.png"];
red = [UIImage imageNamed:@"redball.png"];

I called a method and set a timer:

[NSTimer scheduledTimerWithTimeInterval:(0.5) target:self selector:@selector(onTimer) userInfo:nil repeats:YES];

finally, inside the onTimer I create a random number that chooses a ball and creates it like this:

greenImage = [[UIImageView alloc] initWithImage:green];
greenImage.frame = CGRectMake(startX,0,43,43);
[self.view insertSubview:greenImage belowSubview:bottomBar];