gistfile1.m

	NSView *contentView = [self.window contentView];

	self.button = [[NSButton alloc] initWithFrame:NSMakeRect(0, 0, 200, 50.0f)];
	[self.button setTranslatesAutoresizingMaskIntoConstraints:NO];
	[self.button setTitle:@"This is a test button"];
	[self.button setBordered:YES];
	[contentView addSubview:self.button];

	NSButton *button = self.button;
	NSDictionary *views = NSDictionaryOfVariableBindings(contentView, button);
	[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[button(>=50)]" options:NSLayoutFormatAlignAllTop metrics:nil views:views]];
	[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-[button(>=50)]-|" options:NSLayoutFormatAlignAllBaseline metrics:nil views:views]];

	[contentView addConstraints:@[
	 [NSLayoutConstraint constraintWithItem:self.button
								  attribute:NSLayoutAttributeCenterY
								  relatedBy:NSLayoutRelationEqual
									 toItem:contentView
								  attribute:NSLayoutAttributeCenterY
								 multiplier:1.0
								   constant:0]]];