当我在TextField（在ExerciseSetView内）中输入字符时，我有一个问题，我必须重新单击文本框以使其成为文本，以便我可以输入另一个字符。如果我从“文本字段”中删除了绑定，则可以流畅地输入文本。
我认为这与我的presenter类和updateSet函数重新创建一个集合实例有关，因为我必须在数组内的两个层次上替换一些值。
//
// ContentView.swift
// test
//
//
import SwiftUI
import Combine
import CoreData
class WorkoutExerciseSetVM: Hashable, ObservableObject {
@Published public var id: Int
@Published public var reps: String
@Published public var weight: String
init(id: Int, reps: String, weight: String) {
self.id = id
self.reps = reps
self.weight = weight
}
static func ==(lhs: WorkoutExerciseSetVM, rhs: WorkoutExerciseSetVM) -> Bool {
return ObjectIdentifier(lhs) == ObjectIdentifier(rhs)
}
func hash(into hasher: inout Hasher) { return hasher.combine(ObjectIdentifier(self)) }
}
class WorkoutExerciseVM: Hashable, ObservableObject {
@Published public var id: UUID
@Published public var name: String
@Published public var sets: [WorkoutExerciseSetVM]
init(id: UUID, name: String, sets: [WorkoutExerciseSetVM]) {
self.id = id
self.name = name
self.sets = sets
}
static func ==(lhs: WorkoutExerciseVM, rhs: WorkoutExerciseVM) -> Bool {
return ObjectIdentifier(lhs) == ObjectIdentifier(rhs)
}
func hash(into hasher: inout Hasher) { return hasher.combine(ObjectIdentifier(self)) }
}
class WorkoutVM: Hashable, ObservableObject {
@Published public var id = UUID()
@Published public var name: String
@Published public var exercises: [WorkoutExerciseVM]
@Published public var started: Date? = Date()
@Published public var completed: Date? = Date()
init(id: UUID, name: String, exercises: [WorkoutExerciseVM], started: Date?, completed: Date?) {
self.id = id
self.name = name
self.exercises = exercises
self.started = started
self.completed = completed
}
static func ==(lhs: WorkoutVM, rhs: WorkoutVM) -> Bool {
return ObjectIdentifier(lhs) == ObjectIdentifier(rhs)
}
func hash(into hasher: inout Hasher) { return hasher.combine(ObjectIdentifier(self)) }
}
class WorkoutPresenter: ObservableObject {
@Published public var id: UUID
@Published public var exercises: [WorkoutExerciseVM]
@Published public var name: String
@Published public var started: Date?
@Published public var completed: Date?
init(routine: WorkoutVM) {
self.id = UUID()
self.name = routine.name
self.started = Date()
self.completed = nil
self.exercises = routine.exercises.map{ exercise in
return WorkoutExerciseVM(
id: UUID(),
name: exercise.name,
sets: [
WorkoutExerciseSetVM(id: 1, reps: "0", weight: "0")
]
)
}
}
func removeExercise(id: UUID) {
let exerciseId = id.uuidString;
self.exercises = self.exercises.filter{$0.id.uuidString != exerciseId}
}
func addSet(id: UUID) {
let exerciseId = id.uuidString;
self.exercises = self.exercises.map {
if ($0.id.uuidString == exerciseId) {
if ($0.sets.count == 0) {
$0.sets.append(WorkoutExerciseSetVM(id: 1, reps: "0", weight: "0"))
}
if let lastSet = $0.sets.last {
$0.sets.append(WorkoutExerciseSetVM(id: lastSet.id + 1, reps: lastSet.reps, weight: lastSet.weight))
}
}
return $0
}
}
func updateSet(id: UUID, set: WorkoutExerciseSetVM) {
let exerciseId = id.uuidString
self.exercises = self.exercises.map{
if $0.id.uuidString == exerciseId {
$0.sets = $0.sets.map{(oldExerciseSet) -> WorkoutExerciseSetVM in
if oldExerciseSet.id == set.id {
return set
}
return oldExerciseSet
}
return $0
}
return $0;
}
}
func removeSet(id: UUID) {
let exerciseId = id.uuidString;
self.exercises = self.exercises.map{(exercise) -> WorkoutExerciseVM in
if exercise.id.uuidString == exerciseId {
let newExercise = exercise
if newExercise.sets.count > 1 {
newExercise.sets.removeLast()
}
return newExercise
}
return exercise;
}
}
}
struct ContentView: View {
var body: some View {
VStack {
WorkoutView(presenter: WorkoutPresenter(routine: WorkoutVM(id: UUID(), name: "Test", exercises: [WorkoutExerciseVM(id: UUID(), name: "Exercise", sets: [WorkoutExerciseSetVM(id: 1, reps: "0", weight: "0")])], started: nil, completed: nil)))
}
}
}
struct WorkoutView: View {
@ObservedObject var presenter: WorkoutPresenter
var body: some View {
return GeometryReader { geo in
ZStack {
VStack {
ScrollView {
ForEach(self.presenter.exercises, id: \.self) { exercise in
ExerciseView(presenter: self.presenter, exercise: exercise)
}
}
}
}
}
}
}
struct ExerciseView: View {
@ObservedObject var presenter: WorkoutPresenter
var exercise: WorkoutExerciseVM
var body: some View {
VStack {
VStack(alignment: .leading) {
VStack {
VStack {
ForEach(exercise.sets, id: \.self) { exerciseSet in
ExerciseSetView(
set: exerciseSet,
onUpdate: { newExerciseSet in
self.presenter.updateSet(id: self.exercise.id, set: newExerciseSet)
}
)
}
}
}
}
HStack {
Button(action: {
self.presenter.addSet(id: self.exercise.id)
}) {
HStack {
Image(systemName: "plus")
Text("Add Set")
}
}
Button(action: {
self.presenter.removeSet(id: self.exercise.id)
}) {
HStack {
Image(systemName: "minus")
Text("Remove Set")
}
}
}
}
}
}
struct ExerciseSetView: View {
var set: WorkoutExerciseSetVM
var onUpdate: (_ set: WorkoutExerciseSetVM) -> Void
var body: some View {
let repBinding = Binding(
get: {
String(self.set.reps)
},
set: {
if ($0 as String?) != nil {
self.onUpdate(WorkoutExerciseSetVM(id: self.set.id, reps: $0 , weight: self.set.weight))
}
}
)
let weightBinding = Binding(
get: {
String(self.set.weight)
},
set: {
if ($0 as String?) != nil {
self.onUpdate(WorkoutExerciseSetVM(id: self.set.id, reps: self.set.reps, weight: $0 ))
}
}
)
return HStack {
Spacer()
// textfield that isn't working
TextField("", text: repBinding)
Spacer()
// textfield that isn't working
TextField("", text: weightBinding)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
ObservableObject，应使用它们。只需传递ObservableObjects，让他们为您完成绑定即可，而不是设置自定义绑定。struct ExerciseView: View {
@ObservedObject var presenter: WorkoutPresenter
@ObservedObject var exercise: WorkoutExerciseVM
var body: some View {
VStack {
VStack(alignment: .leading) {
ForEach(exercise.sets, id: \.self) { exerciseSet in
ExerciseSetView(set: exerciseSet)
}
}
HStack {
Button(action: {
self.presenter.addSet(id: self.exercise.id)
}) {
HStack {
Image(systemName: "plus")
Text("Add Set")
}
}
Button(action: {
self.presenter.removeSet(id: self.exercise.id)
}) {
HStack {
Image(systemName: "minus")
Text("Remove Set")
}
}
}
}
}
}
struct ExerciseSetView: View {
@ObservedObject var set: WorkoutExerciseSetVM
var body: some View {
HStack {
Spacer()
TextField("", text: $set.reps)
Spacer()
TextField("", text: $set.weight)
}
}
}
让我知道这是否适合您。