title: How do I change the frame position for a custom MKAnnotationView?
body: <p>I am trying to make a custom annotation view by subclassing <code>MKAnnotationView</code> and overriding the <code>drawRect</code> method. I want the view to be drawn offset from the annotation's position, somewhat like <code>MKPinAnnotationView</code> does it, so that the point of the pin is at the specified coordinates, rather than the middle of the pin. So I set the frame position and size as shown below. However, it doesn't look like I can affect the position of the frame at all, only the size. The image ends up being drawn centered over the annotation position. Any tips on how to achieve what I want?</p>
  
  <p>MyAnnotationView.h:</p>
  
  <pre><code>@interface MyAnnotationView : MKAnnotationView {
  
  }
  </code></pre>
  
  <p>MyAnnotationView.m:</p>
  
  <pre><code>- (id)initWithAnnotation:(id &lt;MKAnnotation&gt;)annotation reuseIdentifier:(NSString *)reuseIdentifier {
      if (self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier]) {
          self.canShowCallout = YES;
          self.backgroundColor = [UIColor clearColor];
          // Position the frame so that the bottom of it touches the annotation position 
          self.frame = CGRectMake(0, -16, 32, 32);
      }
      return self;
  }
  
  - (void)drawRect:(CGRect)rect {
      [[UIImage imageNamed:@"blue-dot.png"] drawInRect:rect];
  }
  </code></pre>