Created
March 5, 2020 09:22
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SwiftUI GridPicker
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import SwiftUI | |
struct GridPicker<Data, Label, Content>: View where Data: RandomAccessCollection, Data.Index == Int, Data.Element: Hashable, Data.Element: Identifiable, Label: View, Content: View { | |
@Environment(\.gridPickerStyle) private var pickerStyle | |
typealias SelectionValue = Data.Element | |
let data: Data | |
let selection: Binding<SelectionValue> | |
let label: Label | |
let content: (Data.Element) -> Content | |
@State private var isContentActive: Bool = false | |
init(_ data: Data, selection: Binding<SelectionValue>, label: Label, @ViewBuilder content: @escaping (SelectionValue) -> Content) { | |
self.data = data | |
self.selection = selection | |
self.label = label | |
self.content = content | |
} | |
var body: some View { | |
NavigationLink(destination: destination, isActive: $isContentActive) { | |
HStack { | |
label | |
Spacer() | |
self.content(selection.wrappedValue) | |
} | |
} | |
} | |
private var numberOfRows: Int { | |
if data.count % pickerStyle.columns == 0 { | |
return data.count / pickerStyle.columns | |
} else { | |
return data.count / pickerStyle.columns + 1 | |
} | |
} | |
private var destination: some View { | |
Group { | |
GeometryReader { proxy in | |
VStack(alignment: .leading, spacing: 0) { | |
ForEach(0..<self.numberOfRows) { row in | |
HStack(spacing: 0) { | |
ForEach(self.items(at: row), id: \.self) { emoji in | |
Button(action: { | |
self.selection.wrappedValue = emoji | |
self.isContentActive = false | |
}) { | |
self.content(emoji) | |
} | |
.frame(width: self.sizeOfItem(in: proxy).width, height: self.sizeOfItem(in: proxy).height) | |
} | |
} | |
} | |
Spacer() | |
} | |
} | |
.navigationBarTitle(pickerStyle.title) | |
.padding() | |
} | |
} | |
private func items(at row: Int) -> Data.SubSequence { | |
if row < numberOfRows - 1 { | |
return data[pickerStyle.columns * row ..< pickerStyle.columns * row + pickerStyle.columns] | |
} else if row == numberOfRows - 1 { | |
return data[pickerStyle.columns * row ..< pickerStyle.columns * row + data.count % pickerStyle.columns] | |
} else { | |
fatalError("row out of bounds") | |
} | |
} | |
private func sizeOfItem(in geo: GeometryProxy) -> CGSize { | |
let width = geo.size.width / CGFloat(pickerStyle.columns) | |
return CGSize(width: width, height: width) | |
} | |
} | |
protocol GridPickerStyle { | |
var title: String { get } | |
var columns: Int { get } | |
} | |
struct DefaultGridPickerStyle: GridPickerStyle { | |
let title: String | |
let columns: Int | |
init(title: String = "Grid Picker", columns: Int = 5) { | |
self.title = title | |
self.columns = columns | |
} | |
} | |
struct GridPickerStyleKey: EnvironmentKey { | |
static let defaultValue: GridPickerStyle = DefaultGridPickerStyle() | |
} | |
extension EnvironmentValues { | |
var gridPickerStyle: GridPickerStyle { | |
get { | |
return self[GridPickerStyleKey.self] | |
} | |
set { | |
self[GridPickerStyleKey.self] = newValue | |
} | |
} | |
} | |
extension View { | |
func gridPickerStyle<Style>(_ style: Style) -> some View where Style : GridPickerStyle { | |
self.environment(\.gridPickerStyle, style) | |
} | |
} | |
extension String: Identifiable { | |
public var id: String { self } | |
} | |
struct ContentView: View { | |
@State var selection: String = "π" | |
let emojis = [ | |
"π", "π", "π", "π", "π", "π", | |
"π", "π₯Ά", "π₯Ί", "π€₯", "π€’", "π€€", | |
"πΆ", "π", "π£", "π", "πΈ", "π¦", | |
"β½οΈ", "π", "βΎοΈ", "π₯", "π", "π±", | |
] | |
var body: some View { | |
NavigationView { | |
Form { | |
HStack { | |
GridPicker(emojis, selection: $selection, label: Text("Emoji")) { | |
Text($0) | |
} | |
.gridPickerStyle(DefaultGridPickerStyle(title: "Emoji Picker")) | |
} | |
} | |
.navigationBarTitle("Fuck Picker") | |
} | |
} | |
} | |
struct ContentView_Previews: PreviewProvider { | |
static var previews: some View { | |
ContentView() | |
} | |
} |
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