Quiero encontrar la posición de una palabra en una oración para poder establecer un marco para esa palabra. Como así, por ejemplo:
¿Actualmente es posible hacer esto en SwiftUI?
Escribí un código y esto es lo que obtuve
import SwiftUI
struct ContentView: View {
@State var text = "I usually get ----- around nine o'clock every morning"
@State var rects = [CGRect.zero]
var body: some View {
ZStack {
TextView(text: $text, rects: $rects)
.overlay(
ForEach(0..<self.rects.count, id: \.self) { index in
RoundedRectangle(cornerRadius: 6)
.frame(width: self.rects[index].size.width, height: self.rects[index].size.height)
.position(self.rects[index].origin)
.foregroundColor(Color.red)
}
)
}
}
}
struct TextView: UIViewRepresentable {
@Binding var text: String
@Binding var rects: [CGRect]
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeUIView(context: Context) -> UITextView {
let textView = UITextView()
textView.delegate = context.coordinator
textView.isEditable = true
textView.isUserInteractionEnabled = true
textView.font = UIFont.systemFont(ofSize: 24)
DispatchQueue.main.async {
let ranges = self.searchRanges(in: textView.text)
self.rects = self.viewRects(for: ranges, textView: textView)
}
return textView
}
func updateUIView(_ uiView: UITextView, context: Context) {
uiView.text = text
}
class Coordinator : NSObject, UITextViewDelegate {
var parent: TextView
init(_ uiTextView: TextView) {
self.parent = uiTextView
}
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
return true
}
func textViewDidChange(_ textView: UITextView) {
self.parent.text = textView.text
}
}
func searchRanges(in text: String) -> [Range<String.Index>] {
var ranges = [Range<String.Index>]()
var searchRange = text.startIndex ..< text.endIndex
var range = text.range(
of: "-----",
options: .caseInsensitive,
range: searchRange,
locale: nil
)
while let findedRange = range {
ranges.append(findedRange)
searchRange = findedRange.upperBound ..< text.endIndex
range = text.range(
of: "-----",
options: .caseInsensitive,
range: searchRange,
locale: nil
)
}
return ranges
}
func viewRects(for rnges: [Range<String.Index>], textView: UITextView) -> [CGRect] {
var rects = [CGRect]()
for range in rnges {
let upperBound = range.upperBound.utf16Offset(in: textView.text)
let lowerBound = range.lowerBound.utf16Offset(in: textView.text)
let length = upperBound - lowerBound
if let start = textView.position(from: textView.beginningOfDocument, offset: lowerBound),
let end = textView.position(from: start, offset: length),
let txtRange = textView.textRange(from: start, to: end) {
var rect = textView.firstRect(for: txtRange)
rect.origin.x = rect.origin.x
rect.origin.y = rect.midY
rects.append(rect)
}
}
return rects
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Mismo código en UIKit con guión gráfico
3 respuestas
No podemos probar directamente su código ya que no tenemos UITextView.firstRect(for:)
. Pero, dos cosas son evidentes:
- Debe usar un ZStack con
alignment: .topLeading
en su.overlay()
. Su ForEach no funcionará de manera consistente como la raíz de.overlay()
una vez que tenga más de un valor enrects
, y SwiftUI se despliega desde el centro de manera predeterminada. - Debe usar
.offset()
no.position()
. La posición se usa para el centro de su marco.
struct ContentView: View {
var rects: [CGRect] = [
.zero,
CGRect(x: 10, y: 10, width: 10, height: 50),
CGRect(x: 20, y: 20, width: 10, height: 50),
CGRect(x: 30, y: 30, width: 10, height: 50)
]
func size(for rect: CGRect) -> CGSize {
CGSize(width: rect.minX, height: rect.minY)
}
var body: some View {
Color.blue.opacity(0.125)
.frame(width: 200, height: 400)
.overlay(
ZStack(alignment: .topLeading) {
Color.clear // Maximize the size of the ZStack
ForEach(0..<self.rects.count, id: \.self) { idx in
Color.red
.frame(width: self.rects[idx].width, height: self.rects[idx].height)
.offset(self.size(for: self.rects[idx]))
}
}
)
}
}
Resultado:
Después de trabajar durante varias horas, llegué a una solución y así es como se ve
import SwiftUI
struct TextView: View {
@State var text = ""
@State var gapText = ""
@State var rects = [CGRect.zero]
@State var pattern: String = "-----"
var body: some View {
ZStack {
Representable(text: $text, rects: $rects, pattern: $pattern)
ForEach(0..<self.rects.count, id: \.self) { index in
ZStack {
Button(action: {
}) {
Text(self.gapText)
.foregroundColor(Color("SMTitle"))
.font(.system(size: 30, weight: .medium))
.multilineTextAlignment(.center)
.padding()
}
.frame(width: self.rects[index].size.width, height: self.rects[index].size.height)
.background(Color.white, alignment: .center)
.position(x: self.rects[index].origin.x, y: self.rects[index].origin.y)
.overlay(
RoundedRectangle(cornerRadius: 6)
.stroke(Color("SMTitle"), lineWidth: 2)
.frame(width: self.rects[index].size.width, height: self.rects[index].size.height)
.position(x: self.rects[index].origin.x, y: self.rects[index].origin.y)
)
}
}
}
}
}
struct Representable: UIViewRepresentable {
@Binding var text: String
@Binding var rects: [CGRect]
@Binding var pattern: String
func makeCoordinator() -> Coordinator {
Coordinator(self)
}
func makeUIView(context: Context) -> UITextView {
let view = UITextView()
view.delegate = context.coordinator
view.isEditable = false
view.isUserInteractionEnabled = true
view.textColor = UIColor(red: 0.325, green: 0.207, blue: 0.325, alpha: 1)
view.font = UIFont.systemFont(ofSize: 30, weight: .medium)
DispatchQueue.main.async {
let ranges = self.searchRanges(in: view.text)
self.rects = self.viewRects(for: ranges, textView: view)
}
return view
}
func updateUIView(_ uiView: UITextView, context: Context) {
uiView.text = text
}
class Coordinator : NSObject, UITextViewDelegate {
var parent: Representable
init(_ uiTextView: Representable) {
self.parent = uiTextView
}
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
return true
}
func textViewDidChange(_ textView: UITextView) {
self.parent.text = textView.text
}
}
func searchRanges(in text: String) -> [Range<String.Index>] {
var ranges = [Range<String.Index>]()
var searchRange = text.startIndex ..< text.endIndex
var range = text.range(
of: self.pattern,
options: .caseInsensitive,
range: searchRange,
locale: nil
)
while let findedRange = range {
ranges.append(findedRange)
searchRange = findedRange.upperBound ..< text.endIndex
range = text.range(
of: self.pattern,
options: .caseInsensitive,
range: searchRange,
locale: nil
)
}
return ranges
}
func viewRects(for ranges: [Range<String.Index>], textView: UITextView) -> [CGRect] {
var rects = [CGRect]()
for range in ranges {
let upperBound = range.upperBound.utf16Offset(in: textView.text)
let lowerBound = range.lowerBound.utf16Offset(in: textView.text)
let length = upperBound - lowerBound
if let start = textView.position(from: textView.beginningOfDocument, offset: lowerBound),
let end = textView.position(from: start, offset: length),
let txtRange = textView.textRange(from: start, to: end) {
var rect = textView.firstRect(for: txtRange)
rect.origin.x = rect.midX
rect.origin.y = rect.midY
rect.size.height = rect.size.height
rects.append(rect)
}
}
return rects
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
TextView(text: "I usually get ----- around nine o'clock every morning", gapText: "up")
}
}
Me gustaría ver una solución más elegante
Puede lograr esto dividiendo el texto, girando sobre él y luego usando un overlay
para enmarcar las palabras que desee.
Vea este ejemplo:
struct HighlightView: View {
var words: [FramableWord] = []
struct FramableWord: Identifiable {
let id = UUID()
let text: String
let isFramed: Bool
}
func frame(word: String, in text: String) -> [FramableWord] {
return text.split(separator: " ").map(String.init).map {
FramableWord(text: $0, isFramed: $0 == word)
}
}
init() {
words = frame(word: "up", in: "I get up at 9")
}
var body: some View {
HStack(spacing: 2) {
ForEach(words) { word -> AnyView in
if word.isFramed {
return AnyView(
Text(word.text)
.padding(2)
.overlay(RoundedRectangle(cornerRadius: 2).stroke(Color.blue, lineWidth: 2))
)
}
return AnyView(Text(word.text))
}
}
}
}
Resultado:
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