My app displays some text that should appear the same regardless of the container view or window size, i.e. it should grow and shrink with the container view or window.
On iOS there is UILabel.adjustsFontSizeToFitWidth but I couldn't find any equivalent API on macOS. On the internet some people suggest to iteratively set a smaller font size until the text fits the available space, but I thought there must be a more efficient solution. How does UILabel.adjustsFontSizeToFitWidth do it?
My expectation was that setting a font's size to a fraction of the window width or height would do the trick, but when resizing the window I can see a slightly different portion of it.
class ViewController: NSViewController {
override func loadView() {
view = MyView(frame: CGRect(x: 0, y: 0, width: 400, height: 400))
NSLayoutConstraint.activate([view.widthAnchor.constraint(equalTo: view.heightAnchor, multiplier: 3), view.heightAnchor.constraint(greaterThanOrEqualToConstant: 100)])
}
}
class MyView: NSView {
let textField = NSTextField(labelWithString: String(repeating: "a b c d e f g h i j k l m n o p q r s t u v w x y z ", count: 2))
override init(frame frameRect: NSRect) {
super.init(frame: frameRect)
textField.translatesAutoresizingMaskIntoConstraints = false
textField.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
addSubview(textField)
NSLayoutConstraint.activate([textField.topAnchor.constraint(equalTo: topAnchor), textField.leadingAnchor.constraint(equalTo: leadingAnchor), textField.trailingAnchor.constraint(equalTo: trailingAnchor)])
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func resize(withOldSuperviewSize oldSize: NSSize) {
// textField.font = .systemFont(ofSize: frame.width * 0.05)
textField.font = .systemFont(ofSize: frame.height * 0.1)
}
}
