Set UILabel to autostart content size in iOS

Question

I am trying to understand basic dynamic layout using native content size. As the picture shows, I have two UILabels in the horizontal direction, which will be my default layout. How to make layout constraints so that

• If the size of the contents of either of the two labels is larger than the other, it should be placed on a vertical stack
• In addition, if the size of the contents of two labels is more than one line, how can we make text that satisfies the vertical layout

Answer 1

stackView intrinsicContentSize UIScreen.main.bounds.width stackView.

if (label1.intrinsicContentSize.width + label2.intrinsicContentSize.width) > (UIScreen.main.bounds.width - 48/* 48 is the left and right margins*/) {
     stackView.axis = .vertical
}else {
     stackView.axis = .horizontal
}

numberOfLines 0.

Answer 2

.

• L1 L2 firstLabel secondLabel,
• L1
• L1
• L1 >= someValue
• L1 >= someValue 999
• L2 L1, nsconstraint
• L2 L1, nsconstraint
• L2 L1, nsconstraint.
• L2 L1, nsconstraint.
• L2 >= someValue

• L2 >= someValue 999

      let firstWidth : CGFloat = (firstLabel?.intrinsicContentSize.width)!
  let secondWidth : CGFloat = (secondLabel?.intrinsicContentSize.width)!
  
  if (firstWidth + secondWidth) <= self.view.frame.size.width - 45.0 {
  
       secondLabelLeadingConstraintTofirstLabelLeading?.priority = UILayoutPriority(rawValue: 250)
       secondLabelSpacingConstraintTofirstLabel?.priority = UILayoutPriority(rawValue: 1000)
       secondLabelTopConstraintTofirstLabelTop?.priority = UILayoutPriority(rawValue: 1000)
       secondLabelTopConstraintTofirstLabelBottom?.priority = UILayoutPriority(rawValue: 250)
  
  }
  else {
  
      secondLabelLeadingConstraintTofirstLabelLeading?.priority = UILayoutPriority(rawValue: 1000)
      secondLabelSpacingConstraintTofirstLabel?.priority = UILayoutPriority(rawValue: 250)
      secondLabelTopConstraintTofirstLabelTop?.priority = UILayoutPriority(rawValue: 250)
      secondLabelTopConstraintTofirstLabelBottom?.priority = UILayoutPriority(rawValue: 1000)
  
  }