如何解决SwiftUI-在NavigationView中显示项目的动态列表时,动态隐藏和显示选项卡会导致问题
这是主要的ContentView:
struct ContentView: View {
@EnvironmentObject var displayDetails: DisplayDetails
@State var selected = 0
var body: some View {
VStack {
ContactList()
Spacer()
ZStack(alignment: .top) {
if (!displayDetails.showFullScreen) {
BottomBar(selected: self.$selected)
.padding()
.padding(.horizontal,22)
.background(CurvedShape())
Button(action: {
}) {
Image("Wishlist")
.renderingMode(.original)
.padding(18)
}
.background(Color.yellow)
.clipShape(Circle())
.offset(y: -32)
.shadow(radius: 5)
}
}
}
.background(Color("Color").edgesIgnoringSafeArea(.top))
}
}
struct CurvedShape : View {
var body : some View {
Path { path in
path.move(to: CGPoint(x: 0,y: 0))
path.addLine(to: CGPoint(x: UIScreen.main.bounds.width,y: 55))
path.addArc(center: CGPoint(x: UIScreen.main.bounds.width / 2,y: 55),radius: 30,startAngle: .zero,endAngle: .init(degrees: 180),clockwise: true)
path.addLine(to: CGPoint(x: 0,y: 55))
}
.fill(Color.white)
.rotationEffect(.init(degrees: 180))
}
}
struct BottomBar : View {
@Binding var selected : Int
var body : some View{
HStack{
Button(action: {
self.selected = 0
}) {
Image("home")
}
.foregroundColor(self.selected == 0 ? .black : .gray)
Spacer(minLength: 12)
Button(action: {
self.selected = 1
}) {
Image("search")
}
.foregroundColor(self.selected == 1 ? .black : .gray)
Spacer().frame(width: 120)
Button(action: {
self.selected = 2
}) {
Image("person")
}
.foregroundColor(self.selected == 2 ? .black : .gray)
.offset(x: -10)
Spacer(minLength: 12)
Button(action: {
self.selected = 3
}) {
Image("menu")
}
.foregroundColor(self.selected == 3 ? .black : .gray)
}
}
}
这是详细视图:
struct DetailView: View {
let contact: Contact
@EnvironmentObject var displayDetails: DisplayDetails
var body: some View {
VStack {
Image(contact.imageName)
.resizable()
.aspectRatio(contentMode: .fill)
.frame(width: 150,height: 150)
.clipped()
.cornerRadius(150)
.shadow(radius: 3)
Text(contact.name)
.font(.title)
.fontWeight(.medium)
Form {
Section {
HStack {
Text("Phone")
Spacer()
Text(contact.phone)
.foregroundColor(.gray)
.font(.callout)
}
HStack {
Text("Email")
Spacer()
Text(contact.email)
.foregroundColor(.gray)
.font(.callout)
}
HStack {
Text("Address")
Spacer()
Text(contact.address)
.foregroundColor(.gray)
.font(.callout)
.frame(width: 180)
}
}
Section {
Button(action: {
print("Send a message")
}) {
Text("Send a message")
}
Button(action: {
print("Call")
}) {
Text("Call")
}
}
}
}
.onDisappear() {
self.displayDetails.showFullScreen.toggle()
}
.onAppear(){
self.displayDetails.showFullScreen.toggle()
}
.environment(\.colorScheme,.dark)
}
}
这是NavigationView列表(ContactList):
struct ContactList: View {
@ObservedObject private var viewModel = ContactViewModel()
var body: some View {
NavigationView {
List(viewModel.contacts) { contact in
NavigationLink(destination: DetailView(contact: contact)) {
ContactRow(contact: contact)
}
}
.navigationBarTitle("Contacts")
.onAppear(){
self.viewModel.fetchdata()
}
}
.environment(\.colorScheme,.dark)
}
}
struct ContactRow: View {
let contact: Contact
var body: some View {
HStack {
Image(contact.imageName)
.resizable()
.aspectRatio(contentMode: .fill)
.frame(width: 60,height: 60)
.clipped()
.cornerRadius(50)
VStack(alignment: .leading) {
Text(contact.name)
.font(.system(size: 21,weight: .medium,design: .default))
Text(contact.phone)
}
}
}
}
最后是根据需要隐藏或可见的标签栏切换的ObservableObject:
class DisplayDetails: ObservableObject {
// Used to move to full screen when detail view is displayed in application
@Published var showFullScreen: Bool = false
}
您需要做的就是将Firebase Firestore(或其他来源)设置为NavigationView(列表)的动态数据
以下是针对Firebase的简单教程:https://firebase.google.com/docs/ios/setup
(您将需要在GCP中创建Firestore实例,并d / l json文件并添加到项目中)
我无法使导航正常工作,因为NavigationView将无法正常工作!?我不确定这是Firebase问题还是SwiftUI问题!最有可能的SwiftUI。
如您所见,在导航到项目列表的导航上,列表本身会回滚到第一个项目并消失?
**问题**,在您没有亲自创建我为您查看行为的示例项目的情况下:
当用户单击列表中的项目时,它将导航到详细视图并根据需要隐藏标签栏。 **当过渡开始时,导航过渡到详细视图时,列表视图会汇总列表中的项目(很奇怪)?我希望只是一张详细视图的幻灯片(当项目列表是静态的时,例如在硬编码数组中,就会发生这种情况)。当用户单击后退按钮返回列表时;将显示该列表(就像从列表中的第一项展开一样),然后该列表再次回滚到第一项中,并且屏幕最终变为空白!?
有人遇到过此问题,您能够解决它吗??
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