I'm stuck on a problem with SwiftUI. I need to color all the letters red and all the numbers black in a TextField while the user is typing them.
Let's say I have this code
TextField(
"A99",
text: $viewModel.code
)
.padding([.trailing])
.multilineTextAlignment(.trailing)
How would I achieve my goal of colouring while the user types?
I'm pretty new to iOS development, also new to SwiftUi and never really used UIKit, so the answer might be obvious but I couldn't find one.
You can try this way for short texts for Now! Not the final Answer!
struct ContentView: View {
@State private var string: String = "A99"
var body: some View {
CustomTextFieldView(titleKey: "Enter your text here ...", string: $string)
}
}
struct CustomTextFieldView: View {
let titleKey: LocalizedStringKey
let letterColor: Color = .red
let numberColor: Color = .black
@Binding var string: String
var body: some View {
HStack(spacing: .zero) {
ForEach(Array(string), id:\.self) { index in
Text(String(describing: index)).foregroundColor(Int(String(describing: index)) != nil ? numberColor : letterColor)
}
Spacer()
}
.overlay(TextField(titleKey, text: $string).foregroundColor(.clear), alignment: .topLeading)
}
}
somewhat crude, but working well for me. The approach is
to put a transparent TextField on top of a Text
that does all the attributed string functions.
You will have to adjust the code for multilines etc...
struct ContentView: View {
@State var txt = "A99"
var body: some View {
ZStack (alignment: .leading) {
Text(txt) { str in
var temp: AttributedString = ""
for char in txt {
var charx = AttributedString(String(char))
charx.foregroundColor = char.isLetter ? .red : .black
temp.append(charx)
}
str = temp
}
TextField("", text: $txt).foregroundColor(.clear)
}.frame(width: 222, height: 33).border(.green)
}
}
EDIT1: include the required Text extension from: How to use Attributed String in SwiftUI
extension Text {
init(_ string: String, configure: ((inout AttributedString) -> Void)) {
var attributedString = AttributedString(string) /// create an `AttributedString`
configure(&attributedString) /// configure using the closure
self.init(attributedString) /// initialize a `Text`
}
}