Created
November 7, 2023 13:21
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A demo of implementing iOS Weather card in SwiftUI.
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| import SwiftUI | |
| struct HeaderView: View { | |
| var body: some View { | |
| HStack { | |
| Image(systemName: "info.circle.fill") | |
| .resizable() | |
| .frame(width: 12, height: 12) | |
| Text("Section Header") | |
| .font(.system(size: 13)) | |
| Spacer() | |
| } | |
| } | |
| } | |
| struct CardView: View { | |
| let index: Int | |
| let coordinateSpace: CoordinateSpace | |
| private let headerHeight: CGFloat = 20 | |
| @State private var offset: CGFloat = 0 | |
| @State private var cellHeight: CGFloat = 0 | |
| var maxOffset: CGFloat { | |
| cellHeight - headerHeight - 16 | |
| } | |
| var body: some View { | |
| ZStack { | |
| VStack(alignment: .leading, spacing: 0) { | |
| HeaderView() | |
| .frame(height: headerHeight) | |
| .padding(.bottom, 4) | |
| .offset(y: offset < 0 ? min(-offset, maxOffset) : 0) | |
| VStack(alignment: .leading) { | |
| Text("\(index + 1) - Title") | |
| .font(.system(size: 16)) | |
| .bold() | |
| .padding(.bottom, 2) | |
| Text("This is description text...") | |
| .font(.system(size: 13)) | |
| } | |
| .clipShape(.rect().offset(y: offset < 0 ? -offset : 0)) | |
| } | |
| .padding(EdgeInsets(top: 8, leading: 12, bottom: 12, trailing: 12)) | |
| .background(Material.thin) | |
| .clipShape(.rect(cornerSize: .init(width: 8, height: 8), style: .continuous)) | |
| .offset(y: offset < -maxOffset ? (-offset - maxOffset) : 0) | |
| .opacity(offset < -maxOffset ? (1 - (-offset - maxOffset) / 22.0) : 1) | |
| } | |
| .background(GeometryReader { reader in | |
| Color.clear | |
| .onChange(of: reader.frame(in: coordinateSpace)) { oldValue, newValue in | |
| offset = newValue.minY | |
| } | |
| .onAppear { | |
| let frame = reader.frame(in: coordinateSpace) | |
| offset = frame.minY | |
| cellHeight = frame.height | |
| } | |
| }) | |
| } | |
| } | |
| struct WeatherView: View { | |
| @State private var coordinateSpaceName = UUID() | |
| var body: some View { | |
| VStack { | |
| Color.clear | |
| .frame(height: 128) | |
| ScrollView { | |
| LazyVStack { | |
| ForEach(0..<20) { index in | |
| CardView(index: index, coordinateSpace: .named(coordinateSpaceName)) | |
| } | |
| } | |
| } | |
| .coordinateSpace(.named(coordinateSpaceName)) | |
| .clipShape(.rect(cornerSize: .init(width: 8, height: 8), style: .continuous)) | |
| .padding(.horizontal, 8) | |
| .ignoresSafeArea(.all, edges: .bottom) | |
| } | |
| .background(Image("Background")) | |
| } | |
| } |
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