Instantiate object on position in Xcode - iphone

Question

What is the code when you want to instantiate an object (for example a bullet) on a certian position on screen? I've tried it myself and searched on the internet but there are no good examples or basic Xcode tutorials that explain this. I don't use Cocos2d. Help is much appreciated :) Thanks in advance!
//
// CoreViewController.m
// Core
//
// Created by user on 29-04-11.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "CoreViewController.h"
#implementation CoreViewController
#synthesize ship;
#synthesize bullet;
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [[event allTouches] anyObject];
if ([touch view] == ship){
//ship
CGPoint location = [touch locationInView:self.view];
ship.center = location;
}
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
if ([touch view] == ship){
//bullet
// CGPoint blltPos = bullet.center;
CGPoint shpPos = ship.center;
// blltPos.x = blltPos.x += 3;
// bullet.center = blltPos;
UIImage *bulletImage = [UIImage imageNamed:#"bullet.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:bulletImage];
imageView.frame = CGRectMake(shpPos.x, shpPos.y, 60, 60);
}
}
#end

Answer 1

If you are using UIKit:
Create a UIImageView that contains a UIImage of the bullet.
Set the frame of the UIImageView to be the location you want (offset to the center) and the size of the image.
Quick example:
UIImage *bulletImage = [UIImage imageNamed:#"bullet.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:bulletImage];
imageView.frame = CGRectMake(xLoc, yLoc, bulletImage.size.width, bulletImage.size.height);

Answer 2

Maybe you've already figured it out, but to add the new UIImageView to a parent view, probably(?) the CoreViewController, you'll have to do something like this after you've done what Mark wrote:
[self.view addSubview:imageView];
or
[self.view insertSubview:imageView atIndex:0];
In the latter example you decides its z-position (atIndex) of the subviews, i.e if you want it to be in front or behind other subviews.