I have a view presented with fullScreenCover. I pass a bunch of variables, all good but ONE of them (input) is not passing/updating. I've noticed the value always retains the first input var from the first fullScreenCover call from the parent view (I call fullscreencover multiple times)
How to pass a var for a view.init in fullScreenCover?
full screen initialization
.fullScreenCover(isPresented: $likeModal, content: {
LikeScreenModalView.init(likeModalShown: $likeModal, indexHere: $index, input: model.matches[index].imageUrl1!, receiver: model.matches[index].name, type: "Image", question: "", receiverImage: model.matches[index].imageUrl1!, picNumber: 1)
.environmentObject(ChatsViewModel())
.environmentObject(ContentModel())
})
struct LikeScreenModalView: View {
#Environment(\.presentationMode) var presentationMode
#EnvironmentObject var chatModel: ChatsViewModel
#EnvironmentObject var model: ContentModel
#Binding var likeModalShown : Bool
#Binding var indexHere: Int
#State var opener: String = ""
#State public var input : String
var receiver: String
var type: String
var question: String
var receiverImage: String
var picNumber: Int
var body: some View {
VStack {
//object reference for opener
if type == "Image" {
WebImage(url: URL(string: input))
.resizable()
.aspectRatio(contentMode: .fit)
.cornerRadius(10)
.padding(10)
} else {
VStack {
Text(input)
}
}
TextField("Say something nice", text: $opener).font(.title)
.multilineTextAlignment(.center)
.padding()
Button {
//write in firebase a new conversation
let user = UserService.shared.user
print(user.id)
//move to next match
DispatchQueue.main.async {
if indexHere == model.matches.count-1 {
//go back to first match
indexHere = 0
} else {
indexHere += 1
}
}
likeModalShown.toggle() //flip to false
chatModel.startConversation(receiver: receiver, message: opener, receiverImg: receiverImage)
} label: {
Text("Send Message")
}.padding()
Button("I chickened out...") {
presentationMode.wrappedValue.dismiss()
}.padding()
}
}
}
#State public var input : String
it may works
Related
Foreach on view must be presented with a View to process.
struct Home : View {
private var numberOfImages = 3
#State var isPresented : Bool = false
#State var currentImage : String = ""
var body: some View {
VStack {
TabView {
ForEach(1..<numberOfImages+1, id: \.self) { num in
Image("someimage")
.resizable()
.scaledToFill()
.onTapGesture() {
currentImage = "top_00\(num)"
isPresented.toggle()
}
}
}.fullScreenCover(isPresented: $isPresented, content: {FullScreenModalView(imageName: currentImage) } )
}
}
I'm trying to display an image in fullScreenCover. My problem is that the first image is empty. Yes, we can solve this defining at the beginning, however, this will complicate the code according to my experiences.
My question is, is it possible to assign a value to currentImage before the onTapGesture processed.
In short, what is the good practice here.
What you need is to use this modifier to present your full screen modal:
func fullScreenCover<Item, Content>(item: Binding<Item?>, onDismiss: (() -> Void)? = nil, content: #escaping (Item) -> Content) -> some View where Item : Identifiable, Content : View
You pass in a binding to an optional and uses the non optional value to construct a destination:
struct ContentView: View {
private let imageNames = ["globe.americas.fill", "globe.europe.africa.fill", "globe.asia.australia.fill"]
#State var selectedImage: String?
var body: some View {
VStack {
TabView {
ForEach(imageNames, id: \.self) { imageName in
Image(systemName: imageName)
.resizable()
.scaledToFit()
.padding()
.onTapGesture() {
selectedImage = imageName
}
}
}
.tabViewStyle(.page(indexDisplayMode: .automatic))
.fullScreenCover(item: $selectedImage) { imageName in
Destination(imageName: imageName)
}
}
}
}
struct Destination: View {
let imageName: String
var body: some View {
ZStack {
Color.blue
Image(
systemName: imageName
)
.resizable()
.scaledToFit()
.foregroundColor(.green)
}
.edgesIgnoringSafeArea(.all)
}
}
You will have to make String identifiable for this example to work (not recommended):
extension String: Identifiable {
public var id: String { self }
}
Building upon #LuLuGaGa’s answer (accept that answer, not this one), instead of making String Identifiable, create a new Identifiable struct to hold the image info. This guarantees each image will have a unique identity, even if they use the same base image name. Also, the ForEach loop now becomes ForEach(imageInfos) since the array contains Identifiable objects.
Use map to turn image name strings into [ImageInfo] by calling the ImageInfo initializer with each name.
This example also puts the displayed image into its own view which can be dismissed with a tap.
import SwiftUI
struct ImageInfo: Identifiable {
let name: String
let id = UUID()
}
struct ContentView: View {
private let imageInfos = [
"globe.americas.fill",
"globe.europe.africa.fill",
"globe.asia.australia.fill"
].map(ImageInfo.init)
#State var selectedImage: ImageInfo?
var body: some View {
VStack {
TabView {
ForEach(imageInfos) { imageInfo in
Image(systemName: imageInfo.name)
.resizable()
.scaledToFit()
.padding()
.onTapGesture() {
selectedImage = imageInfo
}
}
}
.tabViewStyle(.page(indexDisplayMode: .automatic))
.fullScreenCover(item: $selectedImage) { imageInfo in
ImageDisplay(info: imageInfo)
}
}
}
}
struct ImageDisplay: View {
let info: ImageInfo
#Environment(\.dismiss) var dismiss
var body: some View {
ZStack {
Color.blue
Image(
systemName: info.name
)
.resizable()
.scaledToFit()
.foregroundColor(.green)
}
.edgesIgnoringSafeArea(.all)
.onTapGesture {
dismiss()
}
}
}
I have multiple views created by a ForEACH. Each View has a textfield where a user can enter a number. I would like to subtotal each entry in each view. In other words subtotal the binding in each view.
Is my approach wrong?
ForEach(someArray.allCases, id: \.id) { item in
CustomeRowView(name: item.rawValue)
}
struct CustomeRowView: View {
var name: String
#State private var amount: String = ""
var body: some View {
VStack {
HStack {
Label(name, systemImage: image)
VStack {
TextField("Amount", text: $amount)
.frame(width: UIScreen.main.bounds.width / 7)
}
}
}
}
}
Any help would be greatly appreciated.
there are many ways to achieve what you ask. I present here a very
simple approach, using an ObservableObject to keep the info in one place.
It has a function to add to the info dictionary fruits.
A #StateObject is created in ContentView to keep one single source of truth.
It is passed to the CustomeRowView view using #ObservedObject, and used to tally
the input of the TextField when the return key is pressed (.onSubmit).
import SwiftUI
#main
struct TestApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
class FruitCake: ObservableObject {
#Published var fruits: [String : Int] = ["apples":0,"oranges":0,"bananas":0]
// adjust for you purpose
func add(to name: String, amount: Int) {
if let k = fruits.keys.first(where: {$0 == name}),
let sum = fruits[k] {
fruits[k] = sum + amount
}
}
}
struct ContentView: View {
#StateObject var fruitCake = FruitCake()
var body: some View {
VStack {
ForEach(Array(fruitCake.fruits.keys), id: \.self) { item in
CustomeRowView(name: item, fruitCake: fruitCake)
}
}
}
}
struct CustomeRowView: View {
let name: String
#ObservedObject var fruitCake: FruitCake
#State private var amount = 0
var body: some View {
HStack {
Label(name, systemImage: "info")
TextField("Amount", value: $amount, format: .number)
.frame(width: UIScreen.main.bounds.width / 7)
.border(.red)
.onSubmit {
fruitCake.add(to: name, amount: amount)
}
// subtotal
Text("\(fruitCake.fruits[name] ?? 0)")
}
}
}
I am trying to get data from one view to another.
I can not figure out how to get values from the fourth view array into the Third view.
I am not using storyboards. I tried using #EnvironmentObject but can not make it work. New to coding. In xcode I am using watchos without app.
I tried to strip out most of the code and leave just the important stuff that can be tested. I used NavigationLink(destination: )to transfer between views.
enter code here
class viewFromEveryWhere: ObservableObject {
#Published var testname2: String = "testTTname"
}
struct secondView: View {
var body: some View {
Text("second view")
List(1..<7) {
Text("\($0)")
}
}
}
struct thirdView: View {
#EnvironmentObject var testname2: viewFromEveryWhere
#EnvironmentObject var testSixTestArray: viewFromEveryWhere
#State var sixTestArray:[String] = ["ww","GS","DW","CD","TS","JW",]
var body: some View {
List(sixTestArray, id:\.self) {
Text($0)
}
}
}
struct fourthView: View {
#StateObject var testname2 = viewFromEveryWhere()
#State private var name: String = ""
#State var testSixTestArray:[String] = []
func collectName () {
print("collectName triggered")
if testSixTestArray.count < 5 {
// testSixTestArray.append(name)
print(name)
print(testSixTestArray)
}
// .enviromentObject(testSixTestArray)
}
var body: some View {
VStack(alignment: . leading) {
Text("Type a name")
TextField("Enter your name", text: $name)
Text("Click to add, \(name)!")
// Button("click this if \(name) is correct") {}
Button(action:{
print("Button Tapped")
collectName()
print(testSixTestArray.count)
name = ""
}) {
Text("Add \(name) to list")
}
// .buttonStyle(GrowingButton1())
}
Text("forth view")
// testSixTestArray.append(name)
.environmentObject(testname2)
}
}
/*func presentTextInputControllerWithSuggestions(forLanguage suggestionsHandler:
((String)-> [Any]?)?,
allowedInputMode inputMode:
WKTextInputMode,
completion: #escaping ([Any]?) -> Void) {}
*/
struct ContentView: View {
#State var sixNameArray:[String] = ["","","","","","",]
#State var messageTextBox: String = "Start"
#State var button1: String = "Button 1"
#State var button2: String = "Button 2"
#State var button3: String = "Button 3"
var body: some View {
NavigationView {
VStack{
Text(messageTextBox)
.frame(width: 120, height: 15, alignment: .center)
.truncationMode(.tail)
.padding()
NavigationLink(destination: secondView(),
label:{
Text(button1)
})
.navigationBarTitle("Main Page")
NavigationLink(destination: thirdView(),
label:{
Text(button2)
})
NavigationLink(destination: fourthView(),
label:{
Text(button3)
})
}
}
}
}
enter code here
I'm not sure if I created my custom TextField properly, because I am unable to observe the value changes to an #Binded text. Running the following code, you may observe that print(text) is not executed when you manually enter text into the text field.
import SwiftUI
#main
struct TestOutWeirdTextFieldApp: App {
#State var text: String = "" {
didSet {
print(text)
}
}
var body: some Scene {
WindowGroup {
StandardTextField(placeholderText: "Enter text", defaultText: $text)
}
}
}
struct StandardTextField: View {
#State var placeholderText: String {
didSet {
print(#line)
print(placeholderText)
}
}
#Binding var defaultText: String {
didSet {
print(#line)
print(defaultText)
}
}
#State var systemImage: String?
#State var underlineColor: Color = .accentColor
#State var edges: Edge.Set = .all
#State var length: CGFloat? = nil
#State var secure: Bool = false
var body: some View {
HStack {
if secure {
SecureField(placeholderText, text: $defaultText)
.foregroundColor(underlineColor)
} else {
TextField(placeholderText, text: $defaultText)
.foregroundColor(underlineColor)
}
if let systemImage = systemImage {
Image(systemName: systemImage)
.foregroundColor(.white)
}
}
.overlay(
Rectangle()
.frame(height: 2)
.padding(.top, 35)
)
.foregroundColor(underlineColor)
.padding(edges, length)
}
}
struct StandardTextView_Previews: PreviewProvider {
static var previews: some View {
StandardTextField(placeholderText: "Placement text", defaultText: .constant("")).previewLayout(.sizeThatFits)
}
}
Instead of didSet you need to use .onChange(of: modifier, like
HStack {
// ... your code here
}
.onChange(of: defaultText) { print($0) } // << this !!
.overlay(
I created a custom alert. I want the product to be added to the basket when the Ok button on Alert is clicked on the first screen. When the Ok button is pressed on the second screen, the purchase of the product is requested. I called the same alert on 2 pages and I want it to take different actions. I couldn't do that with #Escaping.
AlertView
struct AlertView: View {
#Binding var openShowAlert: Bool
#State var closeShowAlert: Bool = false
#State var openState: CGFloat = -UIScreen.main.bounds.height
#State var closeState: CGFloat = UIScreen.main.bounds.height
var title: String = ""
var message: String = ""
var okButtonText: String = ""
var cancelButtonText: String = ""
var body: some View {
VStack {
Text(title)
.michromaFont(size: 20)
.padding(.top)
Spacer()
Text(message)
.michromaFont(size: 18)
Spacer()
HStack {
Button(action: {
self.openShowAlert = false
openState = -UIScreen.main.bounds.height
closeState = UIScreen.main.bounds.height
}) {
Text(cancelButtonText)
.foregroundColor(.red)
}
Spacer()
Button(action: {}) {
Text(okButtonText)
}
}
.michromaFont(size: 18)
.padding([.horizontal, .bottom])
}
.neumorphisimBackground(width: 300, height: 200)
.offset(y: self.openShowAlert ? self.openState : self.closeState)
.animation(.easeInOut)
.onChange(of: self.openShowAlert, perform: { value in
if value {
self.openState = .zero
}
})
}
}
DetailView
On this screen, click Alert presentation to add the product to the cart.
struct DetailView: View {
#Environment(\.presentationMode) var presentationMode
var device = UIDevice.current.userInterfaceIdiom
#State var width: CGFloat = 300
#State var height: CGFloat = 450
#Binding var text: String
#State var showAlert: Bool = false
var body: some View {
ZStack() {
......
AlertView(openShowAlert: self.$showAlert)
}
.navigationBarHidden(true)
.navigationBarBackButtonHidden(true)
}
}
CartView Click I am providing an alert on this screen to purchase the product.
struct CartView: View {
#State var cartList = [1,2,3,4,5,6,7,8,9]
#Environment(\.presentationMode) var presentationMode
#State var showAlert: Bool = false
var body: some View {
ZStack(alignment: .top) {
.....
AlertView(openShowAlert: self.$showAlert)
}
.navigationBarHidden(true)
.navigationBarBackButtonHidden(true)
}
}
How can I send two different actions in the same alert.
Hmm, I don't see why it shouldn't work with a closure. Have you tried passing over a closure like so?
struct AlertView: View {
...
var okButtonAction: () -> ()
var body: some View {
...
Button(action: okButtonAction) {
Text(okButtonText)
}
}
}
Usage
AlertView(openShowAlert: self.$showAlert) {
// Your custom code
}
Alternative Idea
You could work with Combine and create a publisher with a specific key to identify the sender screen. Then you can put your custom code inside .onReceive().