好吧...所以我想出了一个方法来做到这一点。
首先,我创建了一个struct
存储光标位置
import foundation
struct CursorPosition {
start: Int
end: Int
}
然后我将其初始化为静态
class Global {
public static var cursorPosition = CursorPosition(start: 0, end: 0)
}
最后,我创建了一个自定义视图来匹配 SwiftUITextEditor
并监听选择的变化并更新CursorPosition
import UIKit
import SwiftUI
fileprivate struct UITextViewWrapper: UIViewRepresentable {
typealias UIViewType = UITextView
@Binding var text: String
var onDone: (() -> Void)?
func makeUIView(context: UIViewRepresentableContext<UITextViewWrapper>) -> UITextView {
let textField = UITextView()
textField.delegate = context.coordinator
textField.isEditable = true
textField.font = UIFont.preferredFont(forTextStyle: .body)
textField.isSelectable = true
textField.isUserInteractionEnabled = true
textField.isScrollEnabled = true
textField.backgroundColor = UIColor.clear
if nil != onDone {
textField.returnKeyType = .done
}
textField.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
return textField
}
func updateUIView(_ uiView: UITextView, context: UIViewRepresentableContext<UITextViewWrapper>) {
if uiView.text != self.text {
uiView.text = self.text
}
if uiView.window != nil, !uiView.isFirstResponder {
uiView.becomeFirstResponder()
}
}
func makeCoordinator() -> Coordinator {
return Coordinator(text: $text, onDone: onDone)
}
final class Coordinator: NSObject, UITextViewDelegate {
var text: Binding<String>
var onDone: (() -> Void)?
init(text: Binding<String>, onDone: (() -> Void)? = nil) {
self.text = text
self.onDone = onDone
}
func textViewDidChange(_ uiView: UITextView) {
text.wrappedValue = uiView.text
}
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if let onDone = self.onDone, text == "\n" {
textView.resignFirstResponder()
onDone()
return false
}
return true
}
func textViewDidChangeSelection(_ textView: UITextView) {
if let range = textView.selectedTextRange {
Global.cursorPosition.start = textView.offset(from: textView.beginningOfDocument, to: range.start)
Global.cursorPosition.end = textView.offset(from: textView.beginningOfDocument, to: range.end)
}
}
}
}
struct EditText: View {
private var placeholder: String
private var onCommit: (() -> Void)?
@Binding private var text: String
private var internalText: Binding<String> {
Binding<String>(get: { self.text } ) {
self.text = $0
self.showingPlaceholder = $0.isEmpty
}
}
@State private var showingPlaceholder = false
init (_ placeholder: String = "", text: Binding<String>, onCommit: (() -> Void)? = nil) {
self.placeholder = placeholder
self.onCommit = onCommit
self._text = text
self._showingPlaceholder = State<Bool>(initialValue: self.text.isEmpty)
}
var body: some View {
UITextViewWrapper(text: self.internalText, onDone: onCommit)
.background(placeholderView, alignment: .topLeading)
}
var placeholderView: some View {
Group {
if showingPlaceholder {
Text(placeholder).foregroundColor(.gray)
.padding(.leading, 4)
.padding(.top, 8)
}
}
}
}
并使用它:
EditText("", text: $text)
.onChange(of: text){ _ in
let cursorStart = Global.cursorPosition.start
}