Scroll 我如何正确地通过a";单元格项目“;从迅捷懒散的网格到一张.sheet?
这是我的例子,我不知道这是否是一个bug。我的所有单元格都正确加载,但当我尝试将Scroll 我如何正确地通过a";单元格项目“;从迅捷懒散的网格到一张.sheet?,scroll,swiftui,popover,geometryreader,lazyvgrid,Scroll,Swiftui,Popover,Geometryreader,Lazyvgrid,这是我的例子,我不知道这是否是一个bug。我的所有单元格都正确加载,但当我尝试将DetailView()作为一张工作表显示时,输入的项目始终是网格中首先显示的项目(在我的示例中是左上角),而不是点击的“单元格”。那么,为什么ForEach循环中的项正确地填充了单元格,但没有通过按钮传递到.sheet import SwiftUI let columnCount: Int = 11 let gridSpacing: CGFloat = 1 struct Grid
DetailView()
作为一张工作表显示时,输入的项目始终是网格中首先显示的项目(在我的示例中是左上角),而不是点击的“单元格”。那么,为什么ForEach循环中的项正确地填充了单元格,但没有通过按钮传递到.sheet
import SwiftUI
let columnCount: Int = 11
let gridSpacing: CGFloat = 1
struct GridView: View {
@State var showingDetail = false
let data = (1...755).map { "\($0)" }
let columns: [GridItem] = Array(repeating: .init(.flexible(), spacing: gridSpacing), count: columnCount)
let colCount: CGFloat = CGFloat(columnCount)
var body: some View {
GeometryReader { geo in
ScrollView (showsIndicators: false) {
LazyVGrid(columns: columns, spacing: gridSpacing) {
ForEach(data, id: \.self) { item in
Button(action: {
self.showingDetail.toggle()
}) {
GridCell(item: item, size: (geo.size.width - (colCount * gridSpacing)) / colCount)
}.sheet(isPresented: $showingDetail) {
DetailView(item: item)
}
}
}
}
.padding(.horizontal, gridSpacing)
}
}
}
struct GridCell: View {
let isVault: Bool = false
let item: String
let size: CGFloat
var body: some View {
ZStack {
Rectangle()
.fill(Color.orange)
.cornerRadius(4)
Text(item)
.foregroundColor(.white)
.font(.system(size: size * 0.55))
}
.frame(height: size)
}
}
struct DetailView: View {
let item: String
var body: some View {
Text(item)
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
GridView()
.preferredColorScheme(.dark)
}
}
我错过了什么?另外,在我的iPad pro 11上滚动有点神经质,有人看到过同样的行为吗?在这种情况下,更适合使用由项构造的工作表变体,因为工作表必须从动态内容中移出(否则,您在ForEach中创建的工作表数量与项目数量相同) 这是可能的解决办法。使用Xcode 12/iOS 14进行测试
// helper extension because .sheet(item:...) requires item to be Identifiable
extension String: Identifiable {
public var id: String { self }
}
struct GridView: View {
@State private var selected: String? = nil
let data = (1...755).map { "\($0)" }
let columns: [GridItem] = Array(repeating: .init(.flexible(), spacing: gridSpacing), count: columnCount)
let colCount: CGFloat = CGFloat(columnCount)
var body: some View {
GeometryReader { geo in
ScrollView (showsIndicators: false) {
LazyVGrid(columns: columns, spacing: gridSpacing) {
ForEach(data, id: \.self) { item in
Button(action: {
selected = item // store selected item
}) {
GridCell(item: item, size: (geo.size.width - (colCount * gridSpacing)) / colCount)
}
}
}
}.sheet(item: $selected) { item in // activated on selected item
DetailView(item: item)
}
.padding(.horizontal, gridSpacing)
}
}
}
在这种用例中,更适合使用使用项构造的工作表变体,因为工作表必须从动态内容中移出(否则您创建的工作表数量与ForEach中的项目数量相同) 这是可能的解决办法。使用Xcode 12/iOS 14进行测试
// helper extension because .sheet(item:...) requires item to be Identifiable
extension String: Identifiable {
public var id: String { self }
}
struct GridView: View {
@State private var selected: String? = nil
let data = (1...755).map { "\($0)" }
let columns: [GridItem] = Array(repeating: .init(.flexible(), spacing: gridSpacing), count: columnCount)
let colCount: CGFloat = CGFloat(columnCount)
var body: some View {
GeometryReader { geo in
ScrollView (showsIndicators: false) {
LazyVGrid(columns: columns, spacing: gridSpacing) {
ForEach(data, id: \.self) { item in
Button(action: {
selected = item // store selected item
}) {
GridCell(item: item, size: (geo.size.width - (colCount * gridSpacing)) / colCount)
}
}
}
}.sheet(item: $selected) { item in // activated on selected item
DetailView(item: item)
}
.padding(.horizontal, gridSpacing)
}
}
}