title: How to make a custom view resize with the window with Cocoa Auto Layout?
body: <p>I have a single window with a single custom view in it, and I want the custom view to resize with the window so that it entirely fills it at any time.
  If I write:</p>
  
  <pre><code>NSView *contentView = [self.window contentView];
  CustomView *customView = [[CustomView alloc] initWithFrame:[contentView bounds]];
  [contentView addSubview:customView];
  [contentView addConstraint:
      [NSLayoutConstraint constraintWithItem:customView
          attribute:NSLayoutAttributeWidth
          relatedBy:NSLayoutRelationEqual
          toItem:contentView
          attribute:NSLayoutAttributeWidth
          multiplier:1
          constant:0]];
  [contentView addConstraint:
      [NSLayoutConstraint constraintWithItem:customView
          attribute:NSLayoutAttributeHeight
          relatedBy:NSLayoutRelationEqual
          toItem:contentView
          attribute:NSLayoutAttributeHeight
          multiplier:1
          constant:0]];
  </code></pre>
  
  <p>Then the window doesn't let me resize it.<br>
  If I add:</p>
  
  <pre><code>[customView setTranslatesAutoresizingMaskIntoConstraints:NO];
  </code></pre>
  
  <p>Then the custom view doesn't appear (<code>drawRect:</code> seems to never be called).
  I tried different ways (including the visual format <code>@"|[customview]|"</code>) but I always run into the same problems. I know it could be done with the older autoresizing system, with:</p>
  
  <pre><code>[customView setAutoresizingMask:NSViewWidthSizable|NSViewHeightSizable];
  </code></pre>
  
  <p>but I want to use the Cocoa Auto Layout system, and I want to use it for more complicated cases (like several custom views that always fill the window).</p>
  
  <p>Does anyone know what is wrong and how I should use the Auto Layout system to get the result that I want?</p>