因此，我对Realm和Swift还是相当陌生，我正在构建我的第一个Gym App，并且目前正在为这个错误而苦苦挣扎。每当我尝试滑动以删除行/节时，都会出现此错误。
我认为我正在正确更新Realm，但显然不是因为我不断收到相同的错误。
任何帮助或指导将不胜感激。
import UIKit
import RealmSwift
import SwipeCellKit
class WorkoutsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, SwipeTableViewCellDelegate {
let realm = try! Realm()
var workouts : Results<Workouts>?
var days : Results<WeekDays>!
var daysOfWeek : [String] = ["Monday", "Tuesday", "Wednsday", "Thursday", "Friday", "Saturday", "Sunday"]
let picker = UIPickerView()
@IBOutlet weak var WorkoutsTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
WorkoutsTableView.delegate = self
WorkoutsTableView.dataSource = self
picker.delegate = self
picker.dataSource = self
loadCategories()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
tableView.rowHeight = 80.0
//Populate based on the # of workouts in each day.
let day = days[section]
return day.workouts.count
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return days[section].day
}
func numberOfSections(in tableView: UITableView) -> Int {
return days.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! SwipeTableViewCell
cell.delegate = self
if (days?[indexPath.row]) != nil {
cell.accessoryType = .disclosureIndicator
//Populate with titles of workouts based on section/day of the week.
//cell.textLabel?.text = days?[indexPath.row].workouts[indexPath.row].name
cell.textLabel?.text = days[indexPath.section].workouts[indexPath.row].name
}
return cell
}
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> [SwipeAction]? {
guard orientation == .right else { return nil }
let deleteAction = SwipeAction(style: .destructive, title: "Delete") { action, indexPath in
if let workoutForDeletion = self.days?[indexPath.row] {
do {
try self.realm.write {
self.realm.delete(workoutForDeletion)
}
} catch {
print("Error deleting workout, \(error)")
}
}
self.WorkoutsTableView.reloadData()
}
// customize the action appearance
deleteAction.image = UIImage(named: "delete-icon")
return [deleteAction]
}
func tableView(_ tableView: UITableView, editActionsOptionsForRowAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> SwipeOptions {
var options = SwipeOptions()
options.expansionStyle = .destructive
return options
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
}
@IBAction func AddWorkoutButton(_ sender: UIButton) {
var textField = UITextField()
let alert = UIAlertController(title: "New Workout", message: "Please name your workout...", preferredStyle: .alert)
let addAction = UIAlertAction(title: "Add Workout", style: .default) { (UIAlertAction) in
//Add workout to database
//Create a two dimensional array object in Realm with numbers corresponding to each day of the week.
//Append workouts to the day in the dictionary that the user selects.
let newWorkout = Workouts()
let dow = WeekDays()
dow.day = self.daysOfWeek[self.picker.selectedRow(inComponent: 0)]
newWorkout.name = textField.text!
dow.workouts.append(newWorkout)
self.save(newDay: dow)
}
alert.addTextField { (alertTextField) in
alertTextField.placeholder = "Muscle Group"
textField = alertTextField
alertTextField.inputView = self.picker
}
alert.addAction(addAction)
present(alert, animated: true, completion: nil)
}
func save(newDay: WeekDays){
do {
try realm.write {
realm.add(newDay)
}
} catch {
print("Error saving workout \(error)")
}
WorkoutsTableView.reloadData()
}
func loadCategories(){
days = realm.objects(WeekDays.self)
WorkoutsTableView.reloadData()
}
@IBAction func EditWorkout(_ sender: UIBarButtonItem) {
}
}
extension WorkoutsViewController : UIPickerViewDelegate, UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return 7
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return daysOfWeek[row]
}
}
class WeekDays : Object {
@objc dynamic var day : String = ""
let workouts = List<Workouts>()
}
class Workouts : Object {
@objc dynamic var name : String = ""
var parentDay = LinkingObjects(fromType: WeekDays.self, property: "workouts")
}
答案 0 :(得分：1)
我认为您对import os
from flask import *
from flask_session import Session
from sqlalchemy import *
from sqlalchemy.orm import scoped_session, sessionmaker
from models import *
app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = os.getenv("DATABASE_URL")
# Check for environment variable
if not os.getenv("DATABASE_URL"):
raise RuntimeError("DATABASE_URL is not set")
app.secret_key = '######'
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
db.init_app(app)
engine = create_engine(os.getenv("DATABASE_URL"))
db = scoped_session(sessionmaker(bind=engine))
...
@app.route("/submitpatient", methods=["POST"])
def submitpatient():
fname = request.form.get("fname")
mname = request.form.get("mname")
lname = request.form.get("lname")
patient = Patient(fname=fname, mname=mname, lname=lname)
db.session.add(patient)
db.session.commit()
return redirect(url_for('index'))
的取消引用感到困惑。它看起来像，这是一连串的日子，每一天都包含一系列的锻炼。 self.days函数操作支持此功能，用于计算每一行中的内容：
cellForRowAt但是对于您的删除代码，您仅通过行号来引用cell.textLabel?.text = days[indexPath.section].workouts[indexPath.row].name
，即：
days那里没有使用 if let workoutForDeletion = self.days?[indexPath.row] {
。纠正将有所帮助。
不过，您可能希望查看用于删除行的常用代码，该代码将使用类似于以下的代码：-
indexPath.section保存完整的数据重装并为您提供更好的UI更新。