title: Adding an Image to my UIButton subview
body: <p>I have a <code>UIButton</code> that is added on my super view as a subview, It is just a big block, how do I add an image to my button.</p>
  
  <pre><code>- (void)viewDidLoad
  {
  
  UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
  button.frame = CGRectMake(890, 345 , 100, 100);
  button.backgroundColor = [UIColor purpleColor];
  
  [self.collectionView.superview addSubview:button];
  [button addTarget:self action:@selector(changeContentOffset:) forControlEvents:UIControlEventTouchUpInside];
  }
  </code></pre>