ForEach

SwiftUI에서 ForEach를 사용하여 View를 반복한다.
struct 구조 이므로 직접 view를 반환한다.
List와 함께 사용한다.

import SwiftUI

struct SymbolInfo {
    var SEQ: Int
    var systemName: String = ""
    var name: String = ""
}
struct ContentView: View {

    var symbolLoist = [
        SymbolInfo(SEQ: 1, systemName: "facemask.fill", name: "마스크"),
        SymbolInfo(SEQ: 2, systemName: "brain", name: "뇌"),
        SymbolInfo(SEQ: 3, systemName: "cross.fill", name: "십자가"),
        SymbolInfo(SEQ: 4, systemName: "staroflife.fill", name: "눈"),
        SymbolInfo(SEQ: 5, systemName: "heart.fill", name: "하트")
    ]
    
    var body: some View {
        List {
            ForEach(symbolLoist, id: \.SEQ) { symbolInfo in
                HStack {
                    Text("\(symbolInfo.SEQ)")
                    Image(systemName: symbolInfo.systemName)
                    Text("\(symbolInfo.name)")
                }
            }
            
            ForEach(0..<symbolLoist.count) { index in
                HStack {
                    Text("\(symbolLoist[index].SEQ + symbolLoist.count)")
                        .foregroundColor(Color.white)
                    Image(systemName: symbolLoist[index].systemName)
                        .foregroundColor(Color.white)
                    Text("\(symbolLoist[index].name)")
                        .foregroundColor(Color.white)
                    Spacer()
                }
                .background(Color.black)
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            ContentView()
        }
    }
}

List

단일 열에 정렬된 데이터 행을 표시하는 컨테이너이다.

List Section

import SwiftUI

struct ContentView: View {

    var body: some View {
        List {
            Section(header: Text("Hearder Area")) {
                Text("A")
                Text("A")
                Text("A")
            }
            
            Section(footer: Text("Footer Area")) {
                Text("A")
                Text("A")
                Text("A")
            }
            
            Section(header: Text("Hearder Area"), footer: Text("Footer Area")) {
                Text("A")
                Text("A")
                Text("A")
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            ContentView()
        }
    }
}

데이터 분류 및 정렬

import SwiftUI

struct Animal: Identifiable {
    let id = UUID()
    let name: String
    let type : String
    let index: Int
}

struct ContentView: View {

    var animalList = [
        Animal(name: "푸들", type: "강아지", index: 1),
        Animal(name: "시츄", type: "강아지", index: 2),
        Animal(name: "시바견", type: "강아지", index: 3),
        Animal(name: "닥스훈트", type: "강아지", index: 11),
        Animal(name: "웰시코기", type: "강아지", index: 5),
        Animal(name: "먼치킨", type: "고양이", index: 8),
        Animal(name: "페르시안", type: "고양이", index: 4),
        Animal(name: "스핑크스", type: "고양이", index: 7),
        Animal(name: "뱅골", type: "고양이", index: 10),
        Animal(name: "라가머핀", type: "고양이", index: 6),
        Animal(name: "러시안 블루", type: "고양이", index: 9)
    ]

    var AnimalGroup: [String : [Animal]] {
    	// Type으로 분류
        var data =  Dictionary(grouping: animalList) { animal in
            animal.type
        }
        
        // Index로 정렬
        for(key, value) in data {
            data[key] = value.sorted(by: {$0.index < $1.index})
        }
        
        return data
    }
    
    // section 분류 
    var groupKey: [String] {
        AnimalGroup.map({$0.key})
    }
    
    var body: some View {
        List {
            ForEach(groupKey, id: \.self) { animalKey in
                Section(header: Text("\(animalKey)")) {
                    ForEach(AnimalGroup[animalKey]!) { animal in
                        HStack {
                            Text("\(animal.name)")
                            Text("\(animal.index)")
                        }
                    }
                }
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            ContentView()
        }
    }
}