Resize a keyboard extension

gistfile1.m

-(void)viewDidAppear:(BOOL)animated{
	CGFloat _expandedHeight = 500;
	NSLayoutConstraint *_heightConstraint =
	[NSLayoutConstraint constraintWithItem: self.view
				attribute: NSLayoutAttributeHeight
				relatedBy: NSLayoutRelationEqual
				toItem: nil
				attribute: NSLayoutAttributeNotAnAttribute
				multiplier: 0.0 constant: _expandedHeight];
	[self.view addConstraint: _heightConstraint];
}