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SwiftUI: Text views concatenation how to do this with ForEach loop or array of strings


By : Mary Song
Date : September 14 2020, 07:00 AM
it fixes the issue ForEach quite confusigly is not a loop but a ViewBuilder
What you need is reduce. The docs describe it as:
code :
let words = ["This", "is", "an", "example"]

var body: some View {
    words.reduce(Text(""), { $0 + Text($1) + Text(" ")} )
}


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Laying out Rectangle() Views in SwiftUI inside of ForEach?


By : user2861942
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The error saying you the reason. I recommend you to create a class. So you will able to make it BindableObject if needed and add more properties like Color if needed
code :
class RectangleModel: NSObject, Identifiable {

    var rect: CGRect

    init(rect: CGRect) {
        self.rect = rect
    }

}

SwiftUI ForEach not iterating when array changes. List is empty and ForEach does run


By : Kglay
Date : March 29 2020, 07:55 AM
hop of those help? There are a couple issues here as far as I can tell.
First, I would suggest you try this with your MPCManager:
code :
import SwiftUI
import Combine

class MPCManager: NSObject, BindableObject {
    var didChange = PassthroughSubject<Void, Never>()

    var devices: [Device] = [] {
        didSet {
            self.didChange.send(())
        }
    }
}
struct ContentView : View {
    @ObjectBinding var manager: MPCManager = MPCManager()

    var body: some View {
        List {
            ForEach(self.manager.devices.identified(by: \.name)) { device in
                Text(device.name)
            }
        }
    }
}
import SwiftUI
import Combine

class MPCManager: NSObject, ObservableObject {
    var objectWillChange = PassthroughSubject<Void, Never>()

    var devices: [Device] = [] {
        willSet {
            self.objectWillChange.send()
        }
    }
}
struct ContentView : View {
    @ObservedObject var manager: MPCManager = MPCManager()

    var body: some View {
        List {
            ForEach(self.manager.devices, id: \.name) { device in
                Text(device.name)
            }
        }
    }
}

Using ForEach loop with Binding causes index out of range when array shrinks (SwiftUI)


By : Rippa
Date : March 29 2020, 07:55 AM
To fix the issue you can do @State does seem to not be able to handle this, but ObservableObject works.
I do not claim to know why apart from my best guess, which is that @State tries too hard to avoid redraws by anticipating what the user wants, but in so doing does not support this.
code :
class FlashcardData: ObservableObject {
    @Published var textArray = ["A","B","C"]

    func updateData() {
        textArray = ["A","B"]
    }
}

struct IndexOutOfRangeView: View {
    @ObservedObject var viewModel = FlashcardData()

    var body:some View {
        VStack{
            ForEach(viewModel.textArray.indices, id: \.self){ index in
                TextView(text: self.$viewModel.textArray[index])
                    .padding()
            }
            Button(action: {
                self.viewModel.textArray = ["A","B"]
            }){
                Text(" Shrink array ")
                    .padding()
            }
        }
    }
}

struct TextView:View {
    @Binding var text:String
    var body:some View {
        Text(text)
    }
}

Views do not update inside the ForEach in SwiftUI


By : user3134447
Date : March 29 2020, 07:55 AM
it should still fix some issue You are using ForEach correctly. I think it's the if statement within ButtonColorView's body that's causing problems. Try this:
code :
struct ButtonColorView: View {

    var color: String

    @State var visible = true

    var body: some View {
        HStack {
            Button(visible ? "Invisible" : "Visible") {
                self.visible.toggle()
            }
            if visible {
                Text(color)
            }
        }
    }
}
struct ButtonColorView: View {

    var color: String

    @State var visible = true

    var body: some View {
        HStack {
            if visible {
                HStack {
                    Button("Invisible") {
                        self.visible.toggle()
                    }
                    Text(color)
                }
            } else {
                Button("Visible") {
                    self.visible.toggle()
                }
            }
        }
    }

}

SwiftUI ForEach Views Not Updating For the First Time


By : Panagiotis Papaioann
Date : September 25 2020, 07:00 PM
hop of those help? The reason is When you use stack or ForEach within ScrollView, you have to setFrame limits to initialize the view Setting like the following.
code :
   ScrollView{
            VStack(alignment: .leading, spacing: 0){

                ForEach(self.posts, id: \.id) { preview in
                    PreviewDetailView(preview: preview).background(Color(.red).cornerRadius(30))
                }.frame(maxWidth: .infinity) // Here
            }
        }.onAppear{
                self.fetchPosts()

            }
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