Question

Hi every one here is my code:

-(void) createNewImage {


[imageView setCenter:[self randomPointSquare]];
[[self view] addSubview:imageView];

[views addObject:imageView];
[imageView release];

ix=imageView.center.x;
iy=imageView.center.y;
[XArray addObject:[NSNumber numberWithFloat:(240 - ix)/diviseurVitesse]];
[YArray addObject:[NSNumber numberWithFloat:(160 - iy)/diviseurVitesse]];

}

-(void)moveTheImage{
    for (NSUInteger i = 0; i < [views count]; i++) {
    imageView = [views objectAtIndex:i];
    X = [[XArray objectAtIndex:i] floatValue];
    Y = [[YArray objectAtIndex:i] floatValue];
imageView.center=CGPointMake(imageView.center.x + X, imageView.center.y + Y);

}
With this code, image are created and move to the center of the screen but after some seconds the performance decrease and come to 30fps. I would like to keep fps at 60 but I don’t know how to proceed.Some people say that I can use pool but it’s hard for me to use it because I don’t really know how to use it :/ sorry for my english I’m french :/

Answer 1

Your problem is most likely here – [views addObject:imageView];. Adding object to a persistent dataset like NSMutableArray retains the object, so memory consumption actually grows. Try manipulating your images in [self.view subviews] without storing them in array.

EDIT: Your code should look something like this

- (void)createAndMove {

UIImageView *imageView = [UIImageView alloc] initWithImage:image];
[imageView setCenter:[self randomPointSquare]];
[self.view addSubview:imageView];

[UIView animateWithDuration:5 animations:^{
imageView.center = self.view.center;
}];

}

EDIT 2:

- (void)moveImages {
  for (UIImageView *img in [self.view subviews]) {
  [UIView animateWithDuration:5 animations:^{
    img.center = self.view.center;
  }];
  }
}