var list = [String]()
@IBOutlet weak var TableView: UITableView!
override func viewDidLoad() {
self.title = "Routines"
TableView.delegate = self
TableView.dataSource = self
super.viewDidLoad()
}
//refresh view when going back to this viewcontroller
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
print("Test Worked")
TableView.reloadData()
}
//generating rows
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return (list.count)
}
//returning text in UITableViewCell
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let cell = UITableViewCell(style:
UITableViewCell.CellStyle.default, reuseIdentifier:
"prototype1")
print("printed")
cell.textLabel?.text = list[indexPath.row]
return cell
}
//deleting rows
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath)
{
if editingStyle == UITableViewCell.EditingStyle.delete{
deleteAllData("ToDo")
self.list.remove(at: indexPath.row)
TableView.reloadData()
}
}
@IBAction func didAdd() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(identifier: "addRoutinePage")as! addRoutinePage
self.navigationController?.pushViewController(vc, animated: true)
}
//function to get data from core data
func getData()
{
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "ToDo")
request.returnsObjectsAsFaults = false
do{
//fetching data from coredata
let result = try context.fetch(request)
for data in result as! [NSManagedObject]
{
//appending the list from the value in coredata (attribute) or entity
self.list.append(data.value(forKey: "title")as! String)
print("append success")
}
}catch {
print("failed")
}
}
我的代码有什么问题? 除了UITableViewCell之外,其他一切似乎都能正常工作,我输入的print命令只是为了检查函数是否被执行,它甚至都不能正常工作。 我尝试了TableView.reloadData(),但它仍然不工作。 从逻辑上讲,如果问题出在公共函数,数据源或委托上,它甚至不会生成任何行,但会生成行。 我也尝试调整单元格的高度大小,但它仍然不工作。 请救命!
代码中有几个错误:
CoreData
获取数据完成后,您需要重新加载。func getData() {
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "ToDo")
request.returnsObjectsAsFaults = false
do {
let result = try context.fetch(request)
for data in result as! [NSManagedObject] {
self.list.append(data.value(forKey: "title")as! String)
}
self.TableView.reloadData()
} catch {
print(error)
}
}
override func viewDidLoad() {
super.viewDidLoad()
title = "Routines"
TableView.delegate = self
TableView.dataSource = self
getData()
}