呈现后swiftui页面为空白
我对视图有问题。有问题的视图一旦进入其中,渲染屏幕一会儿,然后消失。我从firebase加载数据。在层级层次上,它是第三个视图 视图A->视图B->视图C 如果从B到C,我有问题,如果从A到问题,它不存在 问题是onAppear返回空后的“self.lineup.fetchHomeTeam” 从ViewB传递到ViewC的数据是正确的 视图C(团队模块视图)->有问题的页面呈现后swiftui页面为空白,swiftui,swiftui-list,Swiftui,Swiftui List,我对视图有问题。有问题的视图一旦进入其中,渲染屏幕一会儿,然后消失。我从firebase加载数据。在层级层次上,它是第三个视图 视图A->视图B->视图C 如果从B到C,我有问题,如果从A到问题,它不存在 问题是onAppear返回空后的“self.lineup.fetchHomeTeam” 从ViewB传递到ViewC的数据是正确的 视图C(团队模块视图)->有问题的页面 struct TeamsModuleView: View { @ObservedObject var lineu
struct TeamsModuleView: View {
@ObservedObject var lineup = LineupViewModel()
@EnvironmentObject var settings: UserSettings
var body: some View {
ScrollView(.vertical) {
Group {
VStack(spacing: 20, content: {
ForEach(lineup.lineupHome, id: \.self) { module in
HStack(alignment: .top, spacing: 10, content: {
ForEach(module.name, id: \.self) { name in
Group {
Spacer()
VStack(alignment: .center, spacing: 0, content: {
Spacer().frame(height: 20)
Image("home")
.resizable()
.frame(width: 30, height: 30)
Text(name)
.foregroundColor(Color.white)
.font(.system(size: 10))
.frame(maxWidth: .infinity, alignment: .center)
.multilineTextAlignment(.center)
Spacer().frame(height: 5)
})
Spacer()
}
}
})
}
ForEach(lineup.lineupAway, id: \.self) { module in
HStack(alignment: .top, spacing: 10, content: {
ForEach(module.name, id: \.self) { name in
Group {
Spacer()
VStack(alignment: .center, spacing: 0, content: {
Spacer().frame(height: 5)
Image("transfert")
.resizable()
.frame(width: 30, height: 30)
Text(name)
.foregroundColor(Color.white)
.font(.system(size: 10))
.frame(maxWidth: .infinity, alignment: .center)
.multilineTextAlignment(.center)
Spacer().frame(height: 20)
})
Spacer()
}
}
})
}
})
.background(
Image("field3")
.resizable()
.aspectRatio(contentMode: .fill)
).edgesIgnoringSafeArea(.all)
}
}.onAppear {
self.lineup.fetchHomeTeam(fixturesId: String(self.settings.fixtureId), teamId: String(self.settings.teamHomeId), team: self.settings.teamHome)
self.lineup.fetchAwayTeam(fixturesId: String(self.settings.fixtureId), teamId: String(self.settings.teamAwayId), team: self.settings.teamAway)
}.onDisappear {
print(self.lineup.lineupHome.isEmpty)
}
.navigationBarTitle("Formazione", displayMode: .inline) //Return true i dont why
}
}
struct TeamsModuleView_Previews: PreviewProvider {
static var previews: some View {
TeamsModuleView()
}
}
LineupViewModel
final class LineupViewModel: ObservableObject {
@Published var lineup = Lineup()
@Published var lineupHome = [LineupView]()
@Published var lineupAway = [LineupView]()
func fetchHomeTeam(fixturesId: String, teamId: String, team: String) {
Webservices().getLineUp(fixturesId: fixturesId, teamId: teamId, team: team) {
self.lineup = $0
var lineupModTemp = [LineupView]()
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DispatchQueue.main.async {
self.lineupHome = lineupModTemp
}
}
}
func fetchAwayTeam(fixturesId: String, teamId: String, team: String) {
Webservices().getLineUp(fixturesId: fixturesId, teamId: teamId, team: team) {
self.lineup = $0
var lineupModTemp = [LineupView]()
-
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DispatchQueue.main.async {
self.lineupAway = lineupModTemp
}
}
}
}
用户设置(实际数据在视图B onclik中修改)
class UserSettings: ObservableObject {
@Published var teamHomeId = 505
@Published var teamAwayId = 518
@Published var teamHome = "Brescia"
@Published var teamAway = "Inter"
@Published var fixtureId = 232614
}