Como un usuario de los tipos de caracteres en un campo de texto, me gustaría mostrar algunos de animación en cada uno de los nuevos carácter escrito (algo así cómo de Efectivo de la Aplicación anima a los números, pero me gustaría implementarlo para caracteres alfabéticos así).
Es posible hacer esto en SwiftUI? Mi intuición es que voy a tener que puente para UIKit para obtener más matizada de acceso a un textfield's elemento, pero no está seguro de cómo implementar realmente que.
Usted puede crear un "Falso" TextField que aparece encima de la real. A continuación, mostrar a los personajes en un ForEach.
Se hace con FocusState en iOS 15
@available(iOS 15.0, *)
struct AnimatedInputView: View {
@FocusState private var isFocused: Int?
@State var text: String = ""
//If all the fonts match the cursor is better aligned
@State var font: Font = .system(size: 48, weight: .bold, design: .default)
@State var color: Color = .gray
var body: some View {
HStack(alignment: .center, spacing: 0){
//To maintain size in between the 2 views
Text(text)
.font(font)
.opacity(0)
.overlay(
//This textField will be invisible
TextField("", text: $text)
.font(font)
.foregroundColor(.clear)
.focused($isFocused, equals: 1)
)
.background(
ZStack{
HStack(alignment: .center, spacing: 0, content: {
//You need an array of unique/identifiable characters
let uniqueArray = text.uniqueCharacters()
ForEach(uniqueArray, id: \.id, content: { char in
CharView(char: char.char, isLast: char == uniqueArray.last, font: font)
})
})
}.opacity(1)
.minimumScaleFactor(0.1)
)
.onAppear(perform: {
//Bring focus to the hidden TextField
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5, execute: {
isFocused = 1
})
})
}
.padding()
.border(color)
.font(.title)
//Bring focus to the hidden textfield
.onTapGesture {
isFocused = 1
}
}
}
struct CharView: View{
var char: Character
var isLast: Bool
var font: Font
@State var scale: CGFloat = 0.75
var body: some View{
Text(char.description)
.font(font)
.minimumScaleFactor(0.1)
.scaleEffect(scale)
.onAppear(perform: {
//Animate only if last character
if isLast{
withAnimation(.linear(duration: 0.5)){
scale = 1
}
}else{
scale = 1
}
})
}
}
@available(iOS 15.0, *)
struct AnimatedInputView_Previews: PreviewProvider {
static var previews: some View {
AnimatedInputView()
}
}
//Convert String to Unique characers
extension String{
func uniqueCharacters() -> [UniqueCharacter]{
let array: [Character] = Array(self)
return array.uniqueCharacters()
}
func numberOnly() -> String {
self.trimmingCharacters(in: CharacterSet(charactersIn: "-0123456789.").inverted)
}
}
extension Array where Element == Character {
func uniqueCharacters() -> [UniqueCharacter]{
var array: [UniqueCharacter] = []
for char in self{
array.append(UniqueCharacter(char: char))
}
return array
}
}
//String/Characters can be repeating so yu have to make them a unique value
struct UniqueCharacter: Identifiable, Equatable{
var char: Character
var id: UUID = UUID()
}
Aquí es un ejemplo de la versión que. sólo toma los números como la muestra de la calculadora
import SwiftUI
@available(iOS 15.0, *)
struct AnimatedInputView: View {
@FocusState private var isFocused: Int?
@State var text: String = ""
//If all the fonts match the cursor is better aligned
@State var font: Font = .system(size: 48, weight: .bold, design: .default)
@State var color: Color = .gray
var body: some View {
HStack(alignment: .center, spacing: 0){
Text("$").font(font)
//To maintain size in between the 2 views
Text(text)
.font(font)
.opacity(0)
.overlay(
//This textField will be invisible
TextField("", text: $text)
.font(font)
.foregroundColor(.clear)
.focused($isFocused, equals: 1)
.onChange(of: text, perform: { value in
if Double(text) == nil{
//Leaves the negative and decimal period
text = text.numberOnly()
}
//This condition can be improved.
//Checks for 2 occurences of the decimal period
//Possible solution
while text.components(separatedBy: ".").count > 2{
color = .red
text.removeLast()
}
//This condition can be improved.
//Checks for 2 occurences of the negative
//Possible solution
while text.components(separatedBy: "-").count > 2{
color = .red
text.removeLast()
}
color = .gray
})
)
.background(
ZStack{
HStack(alignment: .center, spacing: 0, content: {
//You need an array of unique/identifiable characters
let uniqueArray = text.uniqueCharacters()
ForEach(uniqueArray, id: \.id, content: { char in
CharView(char: char.char, isLast: char == uniqueArray.last, font: font)
})
})
}.opacity(1)
.minimumScaleFactor(0.1)
)
.onAppear(perform: {
//Bring focus to the hidden TextField
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5, execute: {
isFocused = 1
})
})
}
.padding()
.border(color)
.font(.title)
//Bring focus to the hidden textfield
.onTapGesture {
isFocused = 1
}
}
}