UILabel_wrap_in_ScrollView.md

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Q: Size a UILabel in SwiftUI via UIViewRepresentable like Text to wrap multiple lines (by Jordan H)

A: The problem here is in ScrollView which requires definite height, but representable does not provide it. The possible solution is to dynamically calculate wrapped text height and specify it explicitly.

Note: as height is calculated dynamically it is available only in run-time, so cannot be tested with Preview.

Tested with Xcode 12 / iOS 14

struct LabelView: View {
    var text: String

    @State private var height: CGFloat = .zero

    var body: some View {
        InternalLabelView(text: text, dynamicHeight: $height)
            .frame(minHeight: height)
    }

    struct InternalLabelView: UIViewRepresentable {
        var text: String
        @Binding var dynamicHeight: CGFloat

        func makeUIView(context: Context) -> UILabel {
            let label = UILabel()
            label.numberOfLines = 0
            label.lineBreakMode = .byWordWrapping
            label.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)

            return label
        }

        func updateUIView(_ uiView: UILabel, context: Context) {
            uiView.text = text

            DispatchQueue.main.async {
                dynamicHeight = uiView.sizeThatFits(CGSize(width: uiView.bounds.width, height: CGFloat.greatestFiniteMagnitude)).height
            }
        }
    }
}