ソフトウェアエンジニアの技術ブログ：Software engineer tech blog

LazyVGrid, LazyHGrid, GridItem, fixed, flexible, adaptive

struct ContentView: View {
    let grids = Array(repeating: GridItem(.fixed(80)), count:4)
    
    var body: some View {
        ScrollView() {
            LazyVGrid(columns: grids){
                ForEach((1...100), id: \.self) {
                    num in Page(str: String(num))
                        .cornerRadius(8)
                        .frame(height: 60)
                }
            }
        }
    }
}

グリッドのサイズ指定の3つのモード
– LazyVGrid(columns:grids)のグリッドレイアウトで何列並べるか、列幅はどうするかは配列gridsで決まる
GridItem(_size: GridItem.Size = .flexible(), spacing: CGFloat? = nil, alignment:Alignment? = nil)

struct ContentView: View {
    let grids = [GridItem(.fixed(30), spacing: 10, alignment: .center),
                 GridItem(.fixed(50), spacing: 10),
                 GridItem(.fixed(240))]
    
    var body: some View {
        LazyVGrid(columns: grids, alignment: .leading, spacing: 20){
            ForEach(photoArray) {
                item in Image(systemName: "doc")
                Text(item.imageName).font(.caption)
                Text(item.title)
            }
        }.padding()
    }
}

struct PhotoData: Identifiable {
    var id = UUID()
    var imageName:String
    var title:String
}

var photoArray = [
    PhotoData(imageName: "IMG_0463", title: "台風で流された親柱"),
    PhotoData(imageName: "IMG_0495", title: "横須賀ヴェルニー記念講演"),
    PhotoData(imageName: "IMG_1378", title: "恋人たちの湘南平テレビ塔"),
    PhotoData(imageName: "IMG_1739", title: "赤い漁具倉庫1"),
    PhotoData(imageName: "IMG_1742", title: "赤い漁具倉庫2"),
    PhotoData(imageName: "IMG_2233", title: "江ノ電501系"),
    PhotoData(imageName: "IMG_2406", title: "茅ヶ崎漁港引き上げモーター小屋"),
    PhotoData(imageName: "IMG_2407", title: "茅ヶ崎漁港第二えぼし丸"),
    PhotoData(imageName: "IMG_2864", title: "相模川河口調整水門"),
    PhotoData(imageName: "IMG_2909", title: "つくばエキスポセンター H2ロケット")
]

struct ContentView: View {
    let grids = [GridItem(.fixed(150), spacing: 20, alignment: .leading),
                 GridItem(.fixed(20), spacing: 5, alignment: .leading),
                 GridItem(.fixed(20), alignment: .leading)]
    
    var body: some View {
        ScrollView(.horizontal){
            LazyHGrid(rows: grids, spacing:20){
                ForEach(photoArray) {
                    item in Image(item.imageName)
                        .resizable()
                        .aspectRatio(contentMode: .fit)
                        .cornerRadius(8)
                    Text(item.imageName).bold()
                    Text(item.title).font(.caption)
                }
            }.padding()
        }
        
    }
}

struct ContentView: View {
    let grids = [
        GridItem(.adaptive(minimum: 80, maximum:.infinity))
    ]
    
    var body: some View {
        ScrollView{
            LazyVGrid(columns: grids, alignment: .leading, spacing: 10){
                ForEach(1...100, id:\.self){
                    num in Ball(str: String(num))
                        .frame(width: 50, height: 50)
                }
                .padding()
            }
        }
        
    }
}

struct Ball: View {
    let str:String
    
    var body: some View {
        ZStack {
            Circle()
                .fill(Color.red)
            Text(str)
                .font(.title)
                .foregroundColor(.white)
        }
    }
}

うおおおおおおお、なんか凄いことになってるな…

ContentView.swift

struct ContentView: View {
    
    var body: some View {
        ScrollView {
            LazyVStack{
                ForEach(0..<10) {
                    num in Page(str: String(num))
                        .frame(width:200, height: 150)
                        .cornerRadius(8)
                }
            }
        }
        .frame(width: 250, height: 500)
        .background(Color.gray.opacity(0.2))
    }
}

struct Page: View {
    let colors:[Color] = [.green, .blue, .pink, .orange, .purple]
    let str:String
    
    var body: some View {
        ZStack {
            colors.randomElement()
            Text(str)
                .font(.largeTitle)
                .foregroundColor(.white)
        }
    }
}

横スクロール

struct ContentView: View {
    let w:CGFloat = UIScreen.main.bounds.width-20
    
    var body: some View {
        VStack(alignment: .leading){
            Text("横スクロール").padding([.leading])
            ScrollView(.horizontal){
                LazyHStack(alignment: .center, spacing: 10){
                    ForEach(0..<10) {
                        num in Page(str: String(num))
                            .frame(width: w, height: 150)
                            .cornerRadius(8)
                    }
                }
            }
            .frame(height: 200)
            .background(Color.gray.opacity(0.2))
        }
    }
}

LazyVStackとLazyHStackで見えてるところをスクロールさせるのね
なるほど、少しずつキャズムに足を踏み入れることが出来る様になってきた…

ScrollView, LazyVStack, LazyHStack, UIScreen.main.bounds, ForEach-in

PhotoData.swift

import Foundation

struct PhotoData: Identifiable {
    var id = UUID()
    var imageName:String
    var title:String
}

var photoArray = [
    PhotoData(imageName: "IMG_0463", title: "台風で流された親柱"),
    PhotoData(imageName: "IMG_0495", title: "横須賀ヴェルニー記念講演"),
    PhotoData(imageName: "IMG_1378", title: "恋人たちの湘南平テレビ塔"),
    PhotoData(imageName: "IMG_1739", title: "赤い漁具倉庫1"),
    PhotoData(imageName: "IMG_1742", title: "赤い漁具倉庫2"),
    PhotoData(imageName: "IMG_2233", title: "江ノ電501系"),
    PhotoData(imageName: "IMG_2406", title: "茅ヶ崎漁港引き上げモーター小屋"),
    PhotoData(imageName: "IMG_2407", title: "茅ヶ崎漁港第二えぼし丸"),
    PhotoData(imageName: "IMG_2864", title: "相模川河口調整水門"),
    PhotoData(imageName: "IMG_2909", title: "つくばエキスポセンター H2ロケット")
]

PhotoView.swift

import SwiftUI

struct PhotoView: View {
    var photo:PhotoData
    
    var body: some View {
        VStack {
            Image(photo.imageName)
                .resizable()
                .aspectRatio(contentMode: .fit)
            Text(photo.title)
                .bold()
                .padding(.top, 10)
                .padding(.bottom, 20)
        }
        .background(Color(red: 0.3, green: 0.8, blue: 0.5))
        .cornerRadius(8)
    }
}

struct PhotoView_Previews: PreviewProvider {
    static var previews: some View {
        PhotoView(photo:photoArray[0])
    }
}

写真データを取り込んでスクロール表示する

struct ContentView: View {
    
    var body: some View {
        ScrollView {
            LazyVStack(alignment: .center, spacing: 20){
                ForEach(photoArray) { photoData in
                    PhotoView(photo:photoData)
                }
            }
        }.padding(.horizontal)
    }
}

うおおおおおおおおお
これは凄いな

struct ContentView: View {

    @State var isModal: Bool = false
    var body: some View {
        Button(action: {
            isModal = true
        }) {
            Text("Sheet テスト")
        }
        .sheet(isPresented: $isModal){
            SomeView()
        }
    }
}

struct ContentView: View {

    @State var isModal: Bool = false
    @State var counter:Int = 0
    
    var body: some View {
        VStack {
            Button(action: {
                isModal = true
            }) {
                Text("Sheetテスト")
            }
            .sheet(isPresented: $isModal, onDismiss: {countUp(}){
                SomeView()
            }
            .disabled(counter >= 3)
                Text("回数\(counter)")
                    .font(.title)
                    .paddin()
        }
    }
                   func countUp(){
                counter += 1
            }
}

なんか久しぶりにSwift触ると、全然頭がついていけないな
少しずつでも毎日継続してやらないと駄目だ