我正在尝试遵循Composing Complex Interfaces关于SwiftUI的指南,并遇到使NavigationLink在iOS 13 beta 3和beta 4上正常工作的问题。
如果您只是下载项目文件并尝试运行它,请单击任意Lake图片-不会发生任何事情。但是,如果单击标题“湖”,它将开始一个接一个地打开每个湖泊,这不是任何人所期望的。
似乎NavigationLink在“复杂”界面中损坏。有解决方法吗?
我试图使其变得不那么复杂,并且删除List的HStack有助于使NavigationLinks正常工作,但是后来我无法像示例中那样构建完整的界面。
代码的相关部分:
var body: some View {
NavigationView {
List {
FeaturedLandmarks(landmarks: featured)
.scaledToFill()
.frame(height: 200)
.clipped()
.listRowInsets(EdgeInsets())
ForEach(categories.keys.sorted(), id: \.self) { key in
CategoryRow(categoryName: key, items: self.categories[key]!)
}
.listRowInsets(EdgeInsets())
NavigationLink(destination: LandmarkList()) {
Text("See All")
}
}
.navigationBarTitle(Text("Featured"))
.navigationBarItems(trailing: profileButton)
.sheet(isPresented: $showingProfile) {
ProfileHost()
}
}
}
struct CategoryRow: View {
var categoryName: String
var items: [Landmark]
var body: some View {
VStack(alignment: .leading) {
Text(self.categoryName)
.font(.headline)
.padding(.leading, 15)
.padding(.top, 5)
ScrollView(.horizontal, showsIndicators: false) {
HStack(alignment: .top, spacing: 0) {
ForEach(self.items, id: \.name) { landmark in
NavigationLink(
destination: LandmarkDetail(
landmark: landmark
)
) {
CategoryItem(landmark: landmark)
}
}
}
}
.frame(height: 185)
}
}
}
struct CategoryItem: View {
var landmark: Landmark
var body: some View {
VStack(alignment: .leading) {
landmark
.image(forSize: 155)
.renderingMode(.original)
.cornerRadius(5)
Text(landmark.name)
.foregroundColor(.primary)
.font(.caption)
}
.padding(.leading, 15)
}
}
答案 0 :(得分:1)
似乎NavigationLinks
中存在一个错误,这些错误没有直接包含在List
中。如果将最外面的List
替换为ScrollView
和VStack
,则内部NavigationLinks
可以正常工作:
即
var body: some View {
NavigationView {
ScrollView(.vertical, showsIndicators: true) {
VStack {
FeaturedLandmarks(landmarks: featured)
.scaledToFill()
.frame(height: 200)
.clipped()
.listRowInsets(EdgeInsets())
ForEach(categories.keys.sorted(), id: \.self) { key in
CategoryRow(categoryName: key, items: self.categories[key]!)
}
.listRowInsets(EdgeInsets())
NavigationLink(destination: LandmarkList()) {
Text("See All")
}
}
}
.navigationBarTitle(Text("Featured"))
}
}