如何解决SwiftUI 中的短信验证码设计和功能
我尝试用六个文本字段来实现它,但发现了很多问题,因为做了很多工作,除了第一个文本字段之外的所有初始输入都被阻塞,firstResponder 的延迟移动等等,是什么让我想知道是否有 6 个文本字段真的是最好的方法。
难点在于功能(即光标平滑移动、前后移动、输入错误时将所有光标变为红色等)我如何实现这样的行为/功能?
截图:-
代码如下:-
import SwiftUI
struct VerficationCode: View {
@State private var numberOfCells: Int = 6
@State private var currentlySelectedCell = 0
var body: some View {
HStack {
Group {
ForEach(0 ..< self.numberOfCells) { index in
CharacterInputCell(currentlySelectedCell: self.$currentlySelectedCell,index: index)
}
}.frame(width:15,height: 56)
.padding(.horizontal)
.foregroundColor(.white)
.cornerRadius(10)
.keyboardType(.numberPad)
}
}
}
struct CharacterInputCell: View {
@State private var textValue: String = ""
@Binding var currentlySelectedCell: Int
var index: Int
var responder: Bool {
return index == currentlySelectedCell
}
var body: some View {
CustomTextField(text: $textValue,currentlySelectedCell: $currentlySelectedCell,isFirstResponder: responder)
}
}
struct CustomTextField: UIViewRepresentable {
class Coordinator: NSObject,UITextFieldDelegate {
@Binding var text: String
@Binding var currentlySelectedCell: Int
var didBecomeFirstResponder = false
init(text: Binding<String>,currentlySelectedCell: Binding<Int>) {
_text = text
_currentlySelectedCell = currentlySelectedCell
}
func textFieldDidChangeSelection(_ textField: UITextField) {
dispatchQueue.main.async {
self.text = textField.text ?? ""
}
}
func textField(_ textField: UITextField,shouldChangeCharactersIn range: NSRange,replacementString string: String) -> Bool {
let currentText = textField.text ?? ""
guard let stringRange = Range(range,in: currentText) else { return false }
let updatedText = currentText.replacingCharacters(in: stringRange,with: string)
if updatedText.count <= 1 {
self.currentlySelectedCell += 1
}
return updatedText.count <= 1
}
}
@Binding var text: String
@Binding var currentlySelectedCell: Int
var isFirstResponder: Bool = false
func makeUIView(context: UIViewRepresentableContext<CustomTextField>) -> UITextField {
let textField = UITextField(frame: .zero)
textField.delegate = context.coordinator
textField.textAlignment = .center
textField.keyboardType = .decimalPad
return textField
}
func makeCoordinator() -> CustomTextField.Coordinator {
return Coordinator(text: $text,currentlySelectedCell: $currentlySelectedCell)
}
func updateUIView(_ uiView: UITextField,context: UIViewRepresentableContext<CustomTextField>) {
uiView.text = text
if isFirstResponder && !context.coordinator.didBecomeFirstResponder {
uiView.becomeFirstResponder()
context.coordinator.didBecomeFirstResponder = true
}
}
}
有人可以向我解释我如何实现这样的行为/功能吗?我已经尝试实施但还没有结果。
任何帮助将不胜感激。
提前致谢。
解决方法
代码:-
import SwiftUI
public struct ContentView: View {
var maxDigits: Int = 6
var label = "Enter One Time Password"
@State var pin: String = ""
@State var showPin = true
var handler: (String,(Bool) -> Void) -> Void
public var body: some View {
VStack {
Text(label).font(.title)
ZStack {
pinDots
backgroundField
}
}
}
private var pinDots: some View {
HStack {
Spacer()
ForEach(0..<maxDigits) { index in
Image(systemName: self.getImageName(at: index))
.font(.system(size: 60,weight: .thin,design: .default))
Spacer()
}
}
}
private func getImageName(at index: Int) -> String {
if index >= self.pin.count {
return "square"
}
if self.showPin {
return self.pin.digits[index].numberString + ".square"
}
return "square"
}
private var backgroundField: some View {
let boundPin = Binding<String>(get: { self.pin },set: { newValue in
self.pin = newValue
self.submitPin()
})
return TextField("",text: boundPin,onCommit: submitPin)
.accentColor(.clear)
.foregroundColor(.clear)
.keyboardType(.numberPad)
}
private var showPinButton: some View {
Button(action: {
self.showPin.toggle()
},label: {
self.showPin ?
Image(systemName: "eye.slash.fill").foregroundColor(.primary) :
Image(systemName: "eye.fill").foregroundColor(.primary)
})
}
private func submitPin() {
if pin.count == maxDigits {
handler(pin) { isSuccess in
if isSuccess {
print("pin matched,go to next page,no action to perfrom here")
} else {
pin = ""
print("this has to called after showing toast why is the failure")
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
//maxDigits = Set According to your condition
//label = Set Title
//Pin Count
ContentView(maxDigits: 6,label: "A",pin: "6",showPin: true) { strng,reponsetrue in
}
}
}
}
extension String {
var digits: [Int] {
var result = [Int]()
for char in self {
if let number = Int(String(char)) {
result.append(number)
}
}
return result
}
}
extension Int {
var numberString: String {
guard self < 10 else { return "0" }
return String(self)
}
}
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