Make one view bigger than others inside UIStackView()

Question

I have a UIStackView which consist of 5 elements. I want the centered one bigger than others (like in below pic).

How I create UIStackView()

stackView.axis  = UILayoutConstraintAxis.horizontal
stackView.distribution = UIStackViewDistribution.fillEqually
stackView.alignment = UIStackViewAlignment.bottom
stackView.spacing = 0.0
stackView.addArrangedSubview(supportedServicesView)
stackView.addArrangedSubview(incidentView)
stackView.addArrangedSubview(contactUsView)
stackView.addArrangedSubview(moreView)
stackView.addArrangedSubview(moreView2)
stackView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(stackView)

stackView.anchor(nil, left: self.view.leftAnchor, bottom: self.view.bottomAnchor, right: self.view.rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 90, rightConstant: 0, widthConstant: 0, heightConstant: 0)

How I create my custom UIViews subview positions;

override func updateConstraints() {
   logoImage.anchor(self.topAnchor, left: self.leftAnchor, bottom: nil, right: self.rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)
   label.anchor(self.logoImage.bottomAnchor, left: self.leftAnchor, bottom: nil, right: self.rightAnchor, topConstant: 10, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)
super.updateConstraints()

}

EDIT: when I add width anchor to centered view, It gets higher width but because heights are same, It doesn't look like bigger.

contactUsView.widthAnchor.constraint(equalToConstant: self.view.frame.width / 5).isActive = true

EDIT 2: When I give height constraint to any view inside UIStackView, Stackviews position (height only) changes to value which I gave to Views height anchor.

Answer 1

I have just implemented this example in a playground.

The UIStackView uses the intrinsic content size to calculate how to place its arranged subviews in the stack view taking the axis, distribution, spacing etc into consideration.

So if you add both a height and width constraint you should see it working. See the example and screenshot of output below.

//: Playground - noun: a place where people can play
import UIKit
import PlaygroundSupport


let stackview = UIStackView(frame: CGRect(x: 0, y: 0, width: 500, height: 150))
stackview.backgroundColor = .white
let colours: [UIColor] = [
    .blue,
    .green,
    .red,
    .yellow,
    .orange
]

for i in 0...4 {

    let view = UIView(frame: CGRect.zero)
    view.backgroundColor = colours[i]
    view.translatesAutoresizingMaskIntoConstraints = false

    if i == 2 {
        view.heightAnchor.constraint(equalToConstant: 130).isActive = true
    } else {
        view.heightAnchor.constraint(equalToConstant: 80).isActive = true
    }
    view.widthAnchor.constraint(equalToConstant: 75)

    stackview.addArrangedSubview(view)
}

stackview.axis  = .horizontal
stackview.distribution = .fillEqually
stackview.alignment = .bottom
stackview.spacing = 0.5

PlaygroundPage.current.liveView = stackview

You can drop this code straight into a playground and tweak the settings for spacing, distribution etc to get the desired output.