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Handling Nested UIStackViews Not Resizing Correctly on iOS 16

πŸ‘€ Views: 78 πŸ’¬ Answers: 1 πŸ“… Created: 2025-06-12
ios uistackview autolayout swift

Could someone explain I'm experiencing an scenario with nested `UIStackView` instances not resizing correctly in my app on iOS 16. I have a vertical `UIStackView` that contains multiple horizontal `UIStackView` instances. The question arises when I programmatically update the constraints of the inner `UIStackView`. Instead of resizing appropriately, the outer `UIStackView` does not seem to recognize the change in intrinsic content size, which leads to unexpected layout behavior. I’ve verified that the `translatesAutoresizingMaskIntoConstraints` property is set to `false` for all views involved, and I’ve called `layoutIfNeeded()` on the parent stack view after making the updates, but the question continues. Here’s a simplified version of my code: ```swift let outerStackView = UIStackView() // Vertical stack let innerStackView = UIStackView() // Horizontal stack // Configure the stack views outerStackView.axis = .vertical innerStackView.axis = .horizontal // Add inner to outer outerStackView.addArrangedSubview(innerStackView) // Adding some buttons to inner stack view for i in 0..<5 { let button = UIButton(type: .system) button.setTitle("Button \(i+1)", for: .normal) innerStackView.addArrangedSubview(button) } // Attempt to update inner stack view constraints innerStackView.widthAnchor.constraint(equalToConstant: 200).isActive = true innerStackView.layoutIfNeeded() // Trying to force layout view.addSubview(outerStackView) ``` When I run the app, the inner stack view does not update its size, and the outer stack view maintains its original size. I checked for any conflicting constraints in the view hierarchy, but everything seems to be in order. Has anyone encountered similar issues with `UIStackView` nesting, and what could be the potential fix for ensuring proper resizing? Additionally, I noticed this behavior is more pronounced when the device is in landscape mode. Thanks for any insights! This is happening in both development and production on Linux. Is this even possible?