How to center vertically labels in a view - ios

Question

I have 4 labels like this in a view:
The view hierarchy like this:
But if one of text in each label is empty, all of other labels should center vertically with the image.
For example: the albumDataLabel.text is empty, then userNameLabel, albumNameLabel, albumLocationLabel should center vertically with the image.
Somethings like this:
So how to do this, please point me to some approaches.

Answer 1

Set height constraint for every label and which label have not text
make it's height zero(from outlet of height constraint by setting constant to 0) at runtime.
Your constraint should be in linear hierarchy like first label's top should be pinned with it's supper view's top and last label's bottom should be pinned with superview's bottom and each and every label's bottom should be pinned with top of below label.
then you should set height constraint for view that contains all labels with constant (>=) of minimum height(least height of your view).
and centered vertically that view with your image view.
you can do this kind of setup!!

Answer 2

Since your 4 Labels are already in a view, you can set the labels' constraints to pin the first Label to the top, last Label the bottom and spacing in between to zero
Then select the view(withLabels) and your ImageView to align their vertical centers
Do not set a height value constraint for your labels nor the view
When one of your labels have an empty string, the height is automatically set to zero and hence 'hidden' so the view(withLabels) will shrink in height. All can be done in the interface builder, no coding necessary, it is just a matter of autolayout.

Answer 3

1) for your userNameLabel:
userNameLabel.leftAnchor.constraintEqualToAnchor(imageView.rightAnchor, constant: 10).active = true
userNameLabel.topAnchor.constraintEqualToAnchor(self.topAnchor, constant: 50).active = true
userNameLabel.widthAnchor.constraintEqualToConstant(220).active = true
userNameLabel.heightAnchor.constraintEqualToConstant(30).active = true
2) for your albumNameLabel:
albumNameLabel.widthAnchor.constraintEqualToConstant(220).active = true
albumNameLabel.heightAnchor.constraintEqualToConstant(30).active = true
albumNameLabel.topAnchor.constraintEqualToAnchor(userNameLabel.bottomAnchor, constant: 5).active = true
albumNameLabel.leftAnchor.constraintEqualToAnchor(imageView.leftAnchor, constant: 10).active = true
3) remember this:
self.addSubview(userNameLabel)
self.addSubview(albumNameLabel)
And go on in this way to all elements in your View.