如何在SwiftUI for MacOS中创建多行文本字段？

Question

如何在SwiftUI for MacOS中创建多行文本字段？

swiftmacosswiftui

3

我正在使用Swift编写我的第一个MacOS应用程序。我需要创建一个简单的可编辑文本框，允许多个段落。在HTML中，这将是一个

- Manngo

这个回答解决了你的问题吗？如何在SwiftUI中创建多行文本框？ - New Dev

@NewDev 谢谢，我已经看过了。据我所知，它需要使用UIKit，但这对于MacOS应用程序不可用。 - Manngo

1个回答

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- Asperi · Accepted Answer

这里是一些像iOS14 TextEditor的组件的初始演示。

演示使用Xcode 11.7 / macOS 10.15.6进行了准备和测试。

struct TestTextArea: View {
    @State private var text = "Placeholder: Enter some text"

    var body: some View {
        VStack {
            TextArea(text: $text)
                .border(Color.black)
//            Text(text) // uncomment to see mirror of enterred text
        }.padding()
    }
}

struct TextArea: NSViewRepresentable {
    @Binding var text: String

    func makeNSView(context: Context) -> NSScrollView {
        context.coordinator.createTextViewStack()
    }

    func updateNSView(_ nsView: NSScrollView, context: Context) {
        if let textArea = nsView.documentView as? NSTextView, textArea.string != self.text {
            textArea.string = self.text
        }
    }

    func makeCoordinator() -> Coordinator {
        Coordinator(text: $text)
    }

    class Coordinator: NSObject, NSTextViewDelegate {
        var text: Binding<String>

        init(text: Binding<String>) {
            self.text = text
        }

        func textView(_ textView: NSTextView, shouldChangeTextIn range: NSRange, replacementString text: String?) -> Bool {
            defer {
                self.text.wrappedValue = (textView.string as NSString).replacingCharacters(in: range, with: text!)
            }
            return true
        }

        fileprivate lazy var textStorage = NSTextStorage()
        fileprivate lazy var layoutManager = NSLayoutManager()
        fileprivate lazy var textContainer = NSTextContainer()
        fileprivate lazy var textView: NSTextView = NSTextView(frame: CGRect(), textContainer: textContainer)
        fileprivate lazy var scrollview = NSScrollView()

        func createTextViewStack() -> NSScrollView {
            let contentSize = scrollview.contentSize

            textContainer.containerSize = CGSize(width: contentSize.width, height: CGFloat.greatestFiniteMagnitude)
            textContainer.widthTracksTextView = true

            textView.minSize = CGSize(width: 0, height: 0)
            textView.maxSize = CGSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude)
            textView.isVerticallyResizable = true
            textView.frame = CGRect(x: 0, y: 0, width: contentSize.width, height: contentSize.height)
            textView.autoresizingMask = [.width]
            textView.delegate = self

            scrollview.borderType = .noBorder
            scrollview.hasVerticalScroller = true
            scrollview.documentView = textView

            textStorage.addLayoutManager(layoutManager)
            layoutManager.addTextContainer(textContainer)

            return scrollview
        }
    }
}