The compiler is unable to type-check this expression in reasonable time in Xcode 12 with SwiftUI

Question

I've just begun running into this error and I've seen that a few others have had this problem as well but there never seems to be a general solution.

Full error: The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions

I know my code isn't necessarily optimized per se but I don't think this should be happening

Code Block swiftvar body: some View {
        return NavigationView {
            List {
                ForEach(tasks, id: \.dueDate) {
                    TaskRow(task: $0)
                }.onDelete(perform: deleteTask)
                Section(header: Text("Projects")
                            .font(.title2)
                            .fontWeight(.bold)
                            .foregroundColor(Color.pink)) {
                    ForEach(projects, id: \.projectTitle) {
                        ProjectRow(project: $0)
                    }.onDelete(perform: deleteProject)
                }
            }.toolbar {
                ToolbarItem (placement: .primaryAction) {
                    #if os(iOS)
											EditButton()
												.padding(10)
												.background(Color.blue)
												.foregroundColor(.white)
												.cornerRadius(10)      
            				#endif
                }
                ToolbarItem (placement: .bottomBar) {
                    Button(action: 
                        self.isAddingTask = true
                        self.isAddingProject = false
                        self.isPresenting = true
                    }) {
                        Text("Add Task")
                            .fontWeight(.semibold)
                   }.padding(10)
										.background(Color.blue)
										.foregroundColor(.white)
										.cornerRadius(10)
                }
                ToolbarItem (placement: .bottomBar) {
                    Button(action: {
                        self.isAddingTask = false
                        self.isAddingProject = true
                        self.isPresenting = true
                    }) {
                        Text("Add Project")
                            .fontWeight(.semibold)
                  }.padding(10)
										.background(Color.pink)
										.foregroundColor(.white)
										.cornerRadius(10)
                }
            }
            .sheet(isPresented: $isPresenting) {
                if isAddingProject {
                    AddProject() { projectTitle in
                        self.addProject(projectTitle: projectTitle)
                        resetModal()
                    }
                } else if isAddingTask {
                    AddTask() { taskDescription, dueDate in
                        self.addTask(taskDescription: taskDescription, dueDate: dueDate)
                        resetModal()
                    }
                }
            }
            .navigationBarTitle(Text("Tasky"))
        }

The error says it's happening at the Navigation View but I have a sneaking suspicion Xcode doesn't actually know.

34k

Posted by

mshipman

Reply

Code Block swift
struct Example: View {
var body: some View {
List {
Section {
EmptyView()
}

//Section {
// EmptyView()
//}

//Section {
// EmptyView()
//}

//Section {
// EmptyView()
//}
}
}

Code Block swift
struct Example: View {
var body: some View {
List {
//Section {
// EmptyView()
// }

Section {
EmptyView()
}

//Section {
// EmptyView()
//}

//Section {
// EmptyView()
//}
}
}

Code Block swift
public struct AddTask: View {
static let DefaultTaskDescription = "Something productive"
static let DefaultDueDate = Date()

@State var taskDescription: String = ""
@State var dueDate: Date = Date()

let onComplete: (String, Date) -> Void

@State private var selectedProject: Project = Project()

@FetchRequest(
entity: Project.entity(),
sortDescriptors: [
NSSortDescriptor(keyPath: \Project.projectTitle, ascending: true)
]
) var projects: FetchedResults<Project>

public var body: some View {
NavigationView {
Form {
Section(header: Text("Task Description")) {
TextField("Task", text: $taskDescription)
}
Section(header: Text("Due Date")) {
DatePicker("Select a due date", selection: $dueDate, in: Date()..., displayedComponents: .date).labelsHidden()
}

HStack {
Spacer()
Button(action: addMoveAction) {
Text("Add Task").fontWeight(.bold)
.padding(10)
.foregroundColor(.white
.background(Color.blue)
.cornerRadius(10)
}
Spacer()
}
}

Code Block
struct ContentView: View {

let astronauts: [Astronaut] = Bundle.main.decode("astronauts.json")
let missions: [Mission] = Bundle.main.decode("missions.json")

var body: some View {
NavigationView {
List(missions) { mission in
NavigationLink(
destination: Text("Detail View"),
label: {
Image(mission.image)
.resizable()
.scaledToFit()
.methodThatDoesntExit()
.frame(width: 44, height: 44)

VStack(alignment: .leading) {
Text(mission.displayName)
.font(.headline)
Text(mission.formattedLaunchDate)
}
})
}
.navigationTitle("Moonshot")
}
}
}

The compiler is unable to type-check this expression in reasonable time in Xcode 12 with SwiftUI

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