Filter array by String

Question

Created Dec ’20

Replies 6

Boosts 0

Views 1.4k

Participants 3

Hi,
In the following code, I filter an array, but it only works with the first letter of the name. For Example, when I write "A" in the TextField, the filter shows me "Apple". But if I write "Ap", the filter shows me nothing. Can you help me?

Code Block SwiftList{
       
      ForEach(groupedArray.keys.sorted().filter{
        text.isEmpty || $0.contains(text)
      }, id: \.self){key in
        Section(header: Text(key)) {
          ForEach(groupedArray[key]!, id: \.self){website in
            NavigationLink(
              destination: WebView(website: website, url: URL(string: website.url)),
              label: {
                Text(website.name)
                Spacer()
                if website.image != ""{
                  RemoteImage(url: website.image).frame(width: 25, height: 25, alignment: .center)
                   
                }else{
                  Loader()
                }
              })
          }
        }
      }
    }

Answered by OOPer in 653832022

In your way of creating groupedArray, its keys contains section titles.
["A", "B", ...]

If you want to filter rows by name, you need to move filter to the second ForEach:

Code Block       ForEach(groupedArray.keys.sorted(), id: \.self){key in //<-
        Section(header: Text(key)) {
          ForEach(groupedArray[key]!.filter{ //<-
            text.isEmpty || $0.name.contains(text) //<-
          }, id: \.self){website in //<-
            NavigationLink(
              destination: WebView(website: website, url: URL(string: website.url)),
              label: {
                Text(website.name)
                Spacer()
                if website.image != ""{
                  RemoteImage(url: website.image).frame(width: 25, height: 25, alignment: .center)
                   
                }else{
                  Loader()
                }
              })
          }
        }
      }

You may want to remove empty sections, but that needs a little more complex code.

Boost

Answer 1

Claude31 OP

Dec ’20

Is groupedArray a dictionary ?
Arrays have no keys property.

Could you show groupedArray content ?
And also show the complete code.

As you don't tell, I have to guess.
Are you sure you want to filter on keys and not values ?

0

Answer 2

Konste4sfi OP

Dec ’20

Yes, groupArray is a dictionary. The complete code is:

Code Block Swiftstruct ResultView: View {
  @State var websites : [Website]
  @Binding var text : String
  @State var groupedArray : [String: [Website]] = [:]
  var body: some View {
   
     
    List{
       
      ForEach(groupedArray.keys.sorted().filter{
        text.isEmpty || $0.contains(text)
      }, id: \.self){key in
        Section(header: Text(key)) {
          ForEach(groupedArray[key]!, id: \.self){website in
            NavigationLink(
              destination: WebView(website: website, url: URL(string: website.url)),
              label: {
                Text(website.name)
                Spacer()
                if website.image != ""{
                  RemoteImage(url: website.image).frame(width: 25, height: 25, alignment: .center)
                   
                }else{
                  Loader()
                }
              })
          }
        }
      }
    }.frame(width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height, alignment: .center)
       .navigationBarTitle("Results")
     
    .colorScheme(.light)
    .onAppear {
       
       
       
       
      groupedArray = Dictionary(
        grouping: websites,
        by: {$0.name.first?.uppercased() ?? ""}
      ).mapValues{$0.sorted()}
       
       
       
    }
  }
   
   
}
struct Loader : UIViewRepresentable{
  func makeUIView(context: UIViewRepresentableContext<Loader>) -> UIActivityIndicatorView {
    let indicator = UIActivityIndicatorView(style: .large)
    indicator.startAnimating()
    return indicator
  }
   
  func updateUIView(_ uiView: UIActivityIndicatorView, context: UIViewRepresentableContext<Loader>) {
     
  }
}

I have this method from a tutorial, but there wasn't the filter method so I wrote it behind the keys in the ForEach. I don't know if thats right. The content is from a database but the array looks like this:

Code Block Swift@State var websites = [Website] = [Website(url: "https://www.apple.com/", name: "Apple", image: "Apple.png" , calls: 0), Website(url: "https://www.amazon.com/", name: "Amazon", image: "Amazon.png" , calls: 0)]

Is that all you need to know?

0

Answer 3

OOPer OP

Dec ’20

Accepted Answer

In your way of creating groupedArray, its keys contains section titles.
["A", "B", ...]

If you want to filter rows by name, you need to move filter to the second ForEach:

Code Block       ForEach(groupedArray.keys.sorted(), id: \.self){key in //<-
        Section(header: Text(key)) {
          ForEach(groupedArray[key]!.filter{ //<-
            text.isEmpty || $0.name.contains(text) //<-
          }, id: \.self){website in //<-
            NavigationLink(
              destination: WebView(website: website, url: URL(string: website.url)),
              label: {
                Text(website.name)
                Spacer()
                if website.image != ""{
                  RemoteImage(url: website.image).frame(width: 25, height: 25, alignment: .center)
                   
                }else{
                  Loader()
                }
              })
          }
        }
      }

You may want to remove empty sections, but that needs a little more complex code.

1

Answer 4

Konste4sfi OP

Dec ’20

Hi, Thank you @OOPer. Do you know how to write the little more complex code?

0

Answer 5

OOPer OP

Dec ’20

Do you know how to write the little more complex code?

You can try something like this:

Code Block struct ResultView: View {
    @State var websites : [Website]
    @Binding var text : String
    @State var groupedArray : [String: [Website]] = [:]
    var body: some View {
        List{
            ForEach(filteredKeys(byName: text), id: \.self){key in //<-
                Section(header: Text(key)) {
                    ForEach(groupedArray[key]!.filter{
                        text.isEmpty  $0.name.contains(text)
                    }, id: \.self) {website in
                        NavigationLink(
                            destination: WebView(website: website, url: URL(string: website.url)),
                            label: {
                                Text(website.name)
                                Spacer()
                                if website.image != ""{
                                    RemoteImage(url: website.image).frame(width: 25, height: 25, alignment: .center)
                                    
                                }else{
                                    Loader()
                                }
                            })
                    }
                }
            }
        }.frame(width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height, alignment: .center)
        .navigationBarTitle("Results")
        
        .colorScheme(.light)
        .onAppear {
            groupedArray = Dictionary(
                grouping: websites,
                by: {$0.name.first?.uppercased() ?? ""}
            ).mapValues{$0.sorted()}
        }
    }
    
    private func filteredKeys(byName text: String) -> [String] {
        return groupedArray.filter {(key, value) in
            value.contains{
                text.isEmpty  $0.name.contains(text)
            }
        }.map {(key, _) in key}.sorted()
    }
    
}

(Sorry, not tested and may need some fixes. And some || are not shown as always, you need to find where to fill in.)

1

Answer 6

Konste4sfi OP

Dec ’20

Perfect, it works! Thank you for helping

0