title: CATextLayer on the top of CALayer?
body: <p>I am trying to get this CATextLayer on top of my CALayer using zPosition, but the CATextLayer seems to always be behind the CALayer?</p>
  
  <pre><code>CALayer *sublayer = [CALayer layer];
  sublayer.backgroundColor = [UIColor colorWithRed:0/255.0 green:156.0/255.0 blue:222.0/255.0 alpha:1.0].CGColor;
  sublayer.shadowOffset = CGSizeMake(0, 3);
  sublayer.shadowRadius = 5.0;
  sublayer.shadowColor = [UIColor blackColor].CGColor;
  sublayer.shadowOpacity = 0.8;
  sublayer.frame = CGRectMake(340, 435, 126, 1);
  sublayer.zPosition=1;
  [self.view.layer addSublayer:sublayer];
  CGSize size=CGSizeMake(126, 265);
  [self resizeLayer:sublayer to:size];
  
  
  
  CATextLayer *label = [[CATextLayer alloc] init];
  [label setFont:@"Helvetica-Neue"];
  [label setFontSize:56];  
  [label setFrame: self.view.frame];
  [label setString:@"56"];
  [label setAlignmentMode:kCAAlignmentCenter];
  [label setForegroundColor:[[UIColor whiteColor] CGColor]];
  label.zPosition=99;
  [self.view.layer  addSublayer:label];
  </code></pre>