Increase the Width of Content View Programmatically in Swift

How to programmatically increase the height of UIView with Swift

You need to create an outlet for the height constraint of the detail view, and then you can adjust the height programmatically like this myHeightConstraint.constant += extraHeight where extraHeight is a number indicating how much taller you want the detail view to be. You also may need to call self.view.layoutIfNeeded() afterwards.

To create an outlet from a constraint, control drag from the constraint in the storyboard editor (just like you would for an outlet of a UIView) into your code.

You are right - because you are using auto layout and constraints, the adjustments need to be made with constraints too. Setting the raw frames can lead to unexpected behavior. Let me know if you have any other questions or difficulties.

How to resize the view in swift programmatically?

First you should connect IBOutlet of the height constraint from Interface Builder and then you can change the constant of the height constraint like this ->

@IBAction func confirmButtonWasPressed(_ sender: Any) {
    if confirmButton.titleLabel?.text == "Confirm pickup location" {

        if !(pickupLocationField.text?.isEmpty ?? false) && originLocation != nil {

        // You can change the value of the constraint
        searchesShadowHeightConstraint.constant = 115

        var imageView = UIImageView()
        var image = UIImage(named: "work25")
        imageView.image = image
        dropoffLocationField.rightView = imageView
        dropoffLocationField.rightViewMode = .always

    } else {
        showToast(with: "Select pick up location")
    }
    // Then you should update the layout
    view.layoutIfNeeded()
}

Set view width size programmatically base on it's subview

I set my customView width size base on it's sub label like this

customView.frame.size.width = customView.messageLabelWidth + 50 // 50 here is for imageView width and some spacing.

where messageLabelWidth in FlyingMessageDisplayView

var messageLabelWidth: CGFloat {
    get {
        return messageLabel.intrinsicContentSize.width
    }
}

It will calculate the width of label first base on text length, then update width of customView

Swift make percentage of width programmatically

Maybe because you're doing this before the cell layouts its subviews and it's size is the same as size set in Any-Any size class 600 * 600.

Try doing adding your buttons in layoutSubviews method, like this:

override func layoutSubviews() {
    super.layoutSubviews()
    self.layoutIfNeeded()

    // add your buttons here

}

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