title: Subview remove and add in objective c/iphone
body: <p>I have a UIViewController class where I create a UIView instance.
  And then I initialize (means fill) it with  25 subviews each containing an image (1, 2, ..., 25). Then after clicking 5 times in these image I called a function where I used</p>
  
  <pre><code>for(UIView *subview in [contentView subviews]) {
      [subview removeFromSuperview];//ContentView name of my view
  }
  </code></pre>
  
  <p>to remove  the previously added subview. And then I use the same approch to
  add 25 new subviews (image 1,2,3,....25). But this time no subview is added.
  Can someone plz give me full code of adding &amp; removing subview.</p>
  
  <p>I have used the following code when I first add subview</p>
  
  <pre><code>//create main window
  
  contentView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
  contentView.backgroundColor = [UIColor blackColor];
  self.view = contentView;
  [contentView release];
  
  //adding 25 subview 1st time
  int a=0;
  int b=0;
  for (int i = 0; i &lt; 26; i++)
  {
  
      CGRect dragRect = CGRectMake(0.0f, 0.0f, x, y);
      dragRect.origin = CGPointMake(a,b);
      DragView *dragger = [[DragView alloc] initWithFrame:dragRect];
      NSString *Flower = [[NSArray arrayWithObjects:@"1.png", @"2.png", @"3.png",@"4.png", @"5.png", @"6.png",@"7.png",@"8.png", @"9.png",@"10.png", @"11.png", @"12.png",@"13.png",@"14.png",@"15.png",@"16.png",@"17.png",@"18.png",@"19.png",@"20.png",@"21.png",@"22.png",@"23.png",@"24.png",@"25.png",@"26.png", nil] objectAtIndex:i];
      [dragger setImage:[UIImage imageNamed:Flower]];
      [dragger setUserInteractionEnabled:YES];
      [self.view addSubview:dragger];
      [dragger release];
      a+=10;
      b+=10;
  }
  
  //then removing 25 subview
  
  //adding 25 subview 2nd times
  </code></pre>
  
  <p>I used the same approch to add the second time as first time, but the problem is that when I remove 25 subview and then add 25 subview, these subview are not added/shown, the view remain same. I am tired with these problem. plz someone help me.</p>