【发布时间】：2020-10-30 14:42:06
【问题描述】：
在我的代码中，我收到了这个错误，我不知道如何解决它。错误在尾随代码块中
struct Map: View {
@ObservedObject public var dataManager = DataManager.shared
@Binding public var seqId: String
// rz- to pass seqId to second view
// @State public var seqId2: String = ""
var body: some View {
ZStack {
VStack {
Text("Results").foregroundColor(Color.white).onAppear{self.dataManager.downloadSeqData(seqId: self.seqId)} .onAppear(perform: playSound)/*rz want to add this sound func to contentview somehow, otherwise it will constantly play sound when page loads */ .edgesIgnoringSafeArea(.all)
//rz- if strand is linear draw line
if dataManager.dataSet?.INSDSeq.topology == "linear" {
Rectangle()
.fill(Color.black)
.frame(width: 500, height: 20)
}
//rz- if strand is circular draw o
if dataManager.dataSet?.INSDSeq.topology == "circular" {
Circle()
.stroke(Color.black, style: StrokeStyle(lineWidth: 20, lineCap: .round, lineJoin: .round))
.frame(width: 500, height: 500)
}
if dataManager.dataSet?.INSDSeq.topology != "circular" && dataManager.dataSet?.INSDSeq.topology != "linear"{
Text("Data Unavailable, try a new accession number.")
}
}
.navigationBarItems(
//rz - added home and genbank view to navigation bars
leading:
NavigationLink(destination: ContentView()) {
Text("New Query")
.font(.title)
.foregroundColor(Color.black)
},
trailing:
NavigationLink(destination: Screen(seqId: self.$seqId)) {
Text("GenBank View")
.font(.title)
.foregroundColor(Color.black)
错误在$seqId
NavigationLink(destination: Screen(seqId: self.$seqId)) {
这是屏幕视图
import SwiftUI
struct Screen: View {
@ObservedObject public var dataManager = DataManager.shared
@State private var seqId: String = ""
var body: some View {
VStack {
TextField("Enter Accession Number", text: $seqId)
.padding()
Button("Search")
{
dataManager.downloadSeqData(seqId: seqId)
}
ScrollView {
VStack(alignment: .leading) {
Text(dataManager.dataSet?.INSDSeq.locus ?? "")
.padding()
Text(dataManager.dataSet?.INSDSeq.organism ?? "").padding()
Text(dataManager.dataSet?.INSDSeq.source ?? "").padding()
Text(dataManager.dataSet?.INSDSeq.taxonomy ?? "").padding()
Text(dataManager.dataSet?.INSDSeq.topology ?? "").padding()
Text(dataManager.dataSet?.INSDSeq.length == nil ? "" : "\(dataManager.dataSet!.INSDSeq.length)") .padding()
Text(dataManager.dataSet?.INSDSeq.strandedness ?? "").padding()
Text(dataManager.dataSet?.INSDSeq.moltype ?? "").padding()
Text(dataManager.dataSet?.INSDSeq.sequence ?? "").padding()
}
.cornerRadius(10)
VStack(alignment: .leading, spacing: 10) {
ForEach(dataManager.featureList, id:\.self) { feature in
VStack (alignment: .leading){
VStack (alignment: .leading) {
Text(feature.INSDFeature_key).bold()
Text(feature.INSDFeature_location)
}.padding()
IntervalSection(feature: feature)
QualsSection(feature: feature)
}
.cornerRadius(10)
}
}
.cornerRadius(20)
}
.padding(.horizontal)
}
}
}
struct IntervalSection: View {
var feature: INSDFeature
var body: some View {
VStack (alignment: .leading){
ForEach(0..<feature.INSDFeature_intervals.count, id: \.self) { i in
ForEach(0..<feature.INSDFeature_intervals[i].INSDInterval.count, id: \.self) { j in
if let from = feature.INSDFeature_intervals[i].INSDInterval[j].INSDInterval_from {
VStack (alignment: .leading){
Text("\(from)").bold()
Text("\(feature.INSDFeature_intervals[i].INSDInterval[j].INSDInterval_to ?? -1)")
}
.padding()
.cornerRadius(10)
}
}
}
}
}
}
struct QualsSection: View{
var feature: INSDFeature
var body: some View {
VStack (alignment: .leading){
ForEach(0..<feature.INSDFeature_quals.count , id: \.self) { i in
ForEach(0..<feature.INSDFeature_quals[i].INSDQualifier.count , id: \.self) { j in
VStack (alignment: .leading){
Text(feature.INSDFeature_quals[i].INSDQualifier[j].INSDQualifier_name).bold()
Text(feature.INSDFeature_quals[i].INSDQualifier[j].INSDQualifier_value)
}
.padding()
.cornerRadius(10)
}
}
}
}
}
【问题讨论】：
-
Screen是什么？对于Screen，init方法是什么样的？很可能你没有这样的 init。 -
Screen 是以列表格式显示信息的内容视图。屏幕页面中没有init方法
-
贴代码太麻烦？它有什么属性，如果它是一个我认为是的结构，总是有一个合成的 init。
-
刚刚上传了
-
并且视图不采用 seqId 作为参数，因为该属性是私有的（并且是
@State变量）。在我看来，屏幕视图不需要用 seqId 初始化，因为它将它作为输入？否则你需要将其更改为@Binding并删除私有