{
    [self setTranslatesAutoresizingMaskIntoConstraints:YES];
    [self addSubview:someView];
    [self addSubview:someOtherView];
    [self addConstraint:...];
}

{
   [self.contentView addSubview:someView];
   [self.contentView addSubview:someOtherView];
   [self.contentView addConstraint:...];
}