adding image to array at runtime and clear it on button click - iphone

Question

wat i am trying to is, each time user touches screen, i am adding a small bulletr image on screen
UIImage *img = [UIImage imageNamed:#"shoot_a.png"]; //bullet shot image
im.image = img;
[self.view addSubview:im];
, if user touches 50 times, there will be 50 images on screen.
now i want, if user hit a button, all these bullet should be remove from the screen.
i hope i am clear about my question.
[im removefromsuperview] doesnt work for me.
if i want to add images to array at run time, how can i add and release?
or is there any better way to clear all images
regards.
this is my touch method, i m adding bullet images on screen frm heere,, but these images are not getting added in Array
// Touch method
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if(restrictTap == YES){
NSUInteger numTaps = [[touches anyObject] tapCount];
NSString *numTapsMessage = [[NSString alloc] initWithFormat:#"%i", numTaps];
[numTapsMessage release];
// getting location
CGPoint touchLocation = [[touches anyObject] locationInView:self.view];
NSString *locationMessage = [[NSString alloc] initWithFormat:#"Location: X = %.0f Y = %.0f", touchLocation.x, touchLocation.y];
//bullet shot image
im = [[UIImageView alloc] initWithFrame:CGRectMake(self.location.x, self.location.y, 12.0, 12.0)];
float j =self.location.x;
float i =self.location.y;
img = [UIImage imageNamed:#"shoot_a.png"]; //bullet shot image
im.image = img;
//im.hidden = NO;
[self.view addSubview:im]; ///bullet shot image is over transparent view
[imageArray addObject:img];
}
}

Answer 1

You could keep track of them via a NSMutableArray property and use that to remove them:
// create e.g. in initializer:
imageArray = [[NSMutableArray alloc] init];
// clean-up, e.g. in dealloc:
self.imageArray = nil;
// add image:
[imageArray addObject:im];
// remove all:
for (UIView *img in imageArray) {
[img removeFromSuperview];
}
[imageArray removeAllObjects];

Answer 2

You can set a particular tag to all the bullet imageViews when you add it to your view
im.tag = 1000;
and then on button touch, you can iterate through subviews array of your view and remove all views with that tag. something like :
int count = [[self.view subviews] count];
for(int i = 0; i < count; i++)
{
if([(UIView*)[[self.view subviews] objectAtIndex:i] tag] == 1000)
{
[(UIView*)[[self.view subviews] objectAtIndex:i] removeFromSuperview]
}
}