在OSX上的Swift中使用setFrameOrigin将其添加到超级视图后，将NSView居中

Question

I am dynamically adding subviews to a superview during runtime and want to resize the superview to match the subview. The resizing is working fine, but it's not centered when I add the subview. The second view seems to be added where the first one ended.

This is a bit of code that is called multiple times and is passed different subViews:

    self.currentConstraints = [
        NSLayoutConstraint(item: superView, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1.0, constant: subView.frame.size.height),
        NSLayoutConstraint(item: superView, attribute: .Width, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1.0, constant: subView.frame.size.width)
    ]

    superView.addConstraints(self.currentConstraints!)

    addChildViewController(viewController)
    superView.addSubview(viewController.view)

I can get the subView to move around with setFrameOrigin , but that moves them both up or down based on where they wrongly positioned in the beginning.

Answer 1

I ended up ditching using constraints and using setFrameSize on the super view. This approach I was skipping before because the popover it was in wasn't resizing, so I just set it as a delegate and had it resize when the new subview was added.

    superView.setFrameSize(subView.frame.size)

    self.delegate.subViewChanged(subView.frame.size)

    addChildViewController(viewController)
    superView.addSubview(viewController.view)