title: How to zoom a UIImageView within a UIScrollView?
body: <p>I have a UIImageView within a UIScrollView and I can vertically scroll, but not horizontal scroll because of how I set the content size. That's exactly how I want.</p>
  
  <p>However, I can't seem to zoom in and out. I set the minimum and maximum zoom scale, but it's not working.</p>
  
  <p>Can someone tell me why?</p>
  
  <p>Thanks.</p>
  
  <pre><code>- (void)viewDidLoad {
      [super viewDidLoad];
      // Do any additional setup after loading the view, typically from a nib.
  
      //self.scrollView.scrollEnabled = YES;
  
      CGSize scrollableSize = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height);
      [self.scrollView setContentSize:scrollableSize];
  
      UIImageView *tempImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"test.png"] ];
      tempImageView.frame = CGRectMake(0, 0, self.scrollView.frame.size.width, self.view.frame.size.height);
  
      self.scrollView.backgroundColor = [UIColor blackColor];
      self.scrollView.minimumZoomScale = 1.0  ;
      self.scrollView.maximumZoomScale = tempImageView.image.size.width / self.scrollView.frame.size.width;
      self.scrollView.zoomScale = 1.0;
      self.scrollView.delegate = self;
  
      [self.scrollView addSubview:tempImageView];
  }
  </code></pre>