I'm trying to implement a text field in a table view that automatically adjusts its height to fit the contained text. My current implementation adjusts its intrinsicContentSize in textDidChange(_:). Unfortunately, NSCell.cellSize(forBounds:) doesn't seem to return the correct height unless setting attributedStringValue and allowsEditingTextAttributes = true for the NSTextField.
Is this expected, or is there a workaround?
Here is the code:
class ViewController: NSViewController, NSTableViewDataSource, NSTableViewDelegate {
var asdf = "asdf fjdskalöf öf fjkldösa jfklödsa kfljsaödkfj klsdajf kldöasj flkjsdöa fkljasö flkjsa öj "
override func loadView() {
view = NSView(frame: CGRect(x: 0, y: 0, width: 400, height: 400))
let scrollView = NSScrollView()
scrollView.translatesAutoresizingMaskIntoConstraints = false
let tableView = NSTableView()
tableView.usesAutomaticRowHeights = true
tableView.addTableColumn(NSTableColumn())
tableView.dataSource = self
tableView.delegate = self
scrollView.documentView = tableView
view.addSubview(scrollView)
NSLayoutConstraint.activate([scrollView.topAnchor.constraint(equalTo: view.topAnchor), scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor), scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor), scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor)])
}
func numberOfRows(in tableView: NSTableView) -> Int {
return 1
}
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
let view = NSTableCellView()
let text = AutoSizingTextField()
text.translatesAutoresizingMaskIntoConstraints = false
text.cell?.wraps = true
// uncommenting the next 2 lines and commenting out the line after them solves the issue
// text.attributedStringValue = NSAttributedString(string: asdf, attributes: [.font: text.font!, .foregroundColor: NSColor.labelColor])
// text.allowsEditingTextAttributes = true
text.stringValue = asdf
view.addSubview(text)
NSLayoutConstraint.activate([text.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20), text.topAnchor.constraint(equalTo: view.topAnchor, constant: 20), text.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -20), text.widthAnchor.constraint(equalToConstant: 200)])
return view
}
}
class AutoSizingTextField: NSTextField {
override var intrinsicContentSize: NSSize {
var size = super.intrinsicContentSize
guard let cell = cell else {
return size
}
var frame = frame
frame.size.height = .infinity
size.height = cell.cellSize(forBounds: frame).height
NSLog("intrinsicContentSize \(size)")
return size
}
override func textDidChange(_ notification: Notification) {
super.textDidChange(notification)
invalidateIntrinsicContentSize()
needsLayout = true
layoutSubtreeIfNeeded()
}
override func layout() {
invalidateIntrinsicContentSize()
super.layout()
}
}
