我正在开发一个应用程序，您可以在其中使用Realm数据库将项目添加到表视图中。目前，我可以将一个项目添加到“表视图”中，但是它已两次添加到“领域数据库”中。这意味着，如果我关闭我的应用程序然后再回到它，则我之前添加的新项目出现两次，一次位于新位置，一次替换其上方表格视图中的项目。附件是我的代码。我尝试了各种不同的方法，但无法弄清楚该如何解决。谢谢您的帮助！
这是我将项目添加到Table View / Realm数据库中的代码：
extension MainTableViewController {
func createNewEventAlertView () {
let newEventAlert = PMAlertController(title: "New Event Alert", description: "", image: nil, style: .alert)
newEventAlert.addTextField { (eventNameAlertTextField) in
eventNameAlertTextField?.placeholder = "Event Name"
eventNameAlertTextField?.adjustsFontSizeToFitWidth = true
eventNameAlertTextField?.textAlignment = .center
eventNameAlertTextField?.text! = nameOfEvent.text!
nameOfEvent = eventNameAlertTextField!
}
newEventAlert.addTextField { (dayEventDateTextField) in
dayEventDateTextField?.placeholder = "Day Of The Month"
dayEventDateTextField?.inputView = dayPickerView
dayOfEvent = dayEventDateTextField!
}
newEventAlert.addTextField { (monthEventDateTextField) in
monthEventDateTextField?.placeholder = "Month"
monthEventDateTextField?.inputView = monthPickerView
monthOfEvent = monthEventDateTextField!
}
newEventAlert.addTextField { (remindOneDayBeforeTextField) in
remindOneDayBeforeTextField?.placeholder = "Remind 1 Day Before?"
remindOneDayBeforeTextField?.inputView = oneDayPickerView
oneDayReminder = remindOneDayBeforeTextField!
}
newEventAlert.addTextField { (remindSevenDaysBeforeTextField) in
remindSevenDaysBeforeTextField?.placeholder = "Remind 7 Days Before?"
remindSevenDaysBeforeTextField?.inputView = sevenDayPickerView
sevenDayReminder = remindSevenDaysBeforeTextField!
}
newEventAlert.addAction(PMAlertAction(title: "Add", style: .default, action: {
print("Add Event Button Pressed in Alert")
//Adding realmEventItem & its variables to the Database
try! realm.write {
//Adding the name & date of the Event to the Realm Database Item
self.realmEventItem.nameOfEventRealm = self.nameOfEvent.text!
let fullDateOfEvent = self.dayOfEvent.text! + " " + self.monthOfEvent.text!
self.realmEventItem.dateOfEventRealm = fullDateOfEvent
//Telling the Realm Database whether they wan't to be reminded one & seven days before the event
if self.oneDayReminder.text == "Yes" {
self.realmEventItem.oneDayBeforeReminderRealm = true
} else {self.realmEventItem.oneDayBeforeReminderRealm = false}
if self.sevenDayReminder.text == "Yes" {
self.realmEventItem.sevenDaysBeforeReminderRealm = true
} else {self.realmEventItem.sevenDaysBeforeReminderRealm = false}
// Making Sure there is something written in the Name & Date Text Fields before allowing anything to be added
if self.nameOfEvent.text != "" && self.dayOfEvent.text != "" && self.monthOfEvent.text != "" {
/*
- use create method instead of add method to add new entries,
- Because add method replaces last new entry with our previous entry,
- so every time only one object store in database
*/
realm.create(RealmEventItem.self, value: self.realmEventItem, update: false)
self.tableView.insertRows(at: [IndexPath.init(row: realmEventList.count-1, section: 0)], with: .automatic)
//By Adding the follwing line it has meant that my code no longer crashes when I add an Item, then delete it & then try and add another item again.
self.tableView.numberOfRows(inSection: realmEventList.count)
print(realmEventList.count)
self.labelWhenTableViewIsEmpty.text = ""
print("Add to Table View Called")
} else {
// Missing Boxes
print("Missing Information!")
}
// This makes sure that each time the user goes to add a new Event all the picker are reset
if self.nameOfEvent.text != "" { self.nameOfEvent.text = "" }
if self.dayPickerView.selectedRow(inComponent: 0) != 0 { self.dayPickerView.selectRow(0, inComponent: 0, animated: false) }
if self.monthPickerView.selectedRow(inComponent: 0) != 0 {self.monthPickerView.selectRow(0, inComponent: 0, animated: false)}
if self.oneDayPickerView.selectedRow(inComponent: 0) != 0 {self.oneDayPickerView.selectRow(0, inComponent: 0, animated: false)}
if self.sevenDayPickerView.selectedRow(inComponent: 0) != 0 {self.sevenDayPickerView.selectRow(0, inComponent: 0, animated: false)}
}
print("REAL DATA:::-- \(realm.objects(RealmEventItem.self))")
}))
newEventAlert.addAction(PMAlertAction(title: "Cancel", style: .cancel, action: {
print("Cancel Button Pressed in Alert")
}))
present(newEventAlert, animated: true, completion: nil)
}
}
答案 0 :(得分：0)
我设法通过使用类型为RealmEventItem（）的新变量解决了该问题 现在，已更改的代码（在try！realm.write中）如下：
try! realm.write {
//The concept of adding a newEventItem of type RealmEventItem() & and then adding all the values to it rather than direct to the RealmEventItem() fixed the problem of the new items replacing the previous ones.
let newEventItem = RealmEventItem()
// Joining the Day & Month Together
let fullDateOfEvent = self.dayOfEvent.text! + " " + self.monthOfEvent.text!
// Making Variables to give a boolean of whether the user would like reminders
var oneDayReminderItem = false
var sevenDayReminderItem = false
if self.oneDayReminder.text == "Yes" {
oneDayReminderItem = true
} else {oneDayReminderItem = false}
if self.sevenDayReminder.text == "Yes" {
sevenDayReminderItem = true
} else {sevenDayReminderItem = false}
//Setting the values to the newEventItem --> which is part of the RealmEventItem()
newEventItem.nameOfEventRealm = self.nameOfEvent.text!
newEventItem.dateOfEventRealm = fullDateOfEvent
newEventItem.oneDayBeforeReminderRealm = oneDayReminderItem
newEventItem.sevenDaysBeforeReminderRealm = sevenDayReminderItem
// Making Sure there is something written in the Name & Date Text Fields before allowing anything to be added
if self.nameOfEvent.text != "" && self.dayOfEvent.text != "" && self.monthOfEvent.text != "" {
/*
- use create method instead of add method to add new entries,
- Because add method replaces last new entry with our previous entry,
- so every time only one object store in database
*/
//realm.add(newEventItem, update: false)
realm.create(RealmEventItem.self, value: newEventItem, update: false)
self.tableView.insertRows(at: [IndexPath.init(row: realmEventList.count-1, section: 0)], with: .automatic)
//By Adding the following line it has meant that my code no longer crashes when I add an Item, then delete it & then try and add another item again.
self.tableView.numberOfRows(inSection: realmEventList.count)
print(realmEventList.count)
self.labelWhenTableViewIsEmpty.text = ""
print("Add to Table View Called")
} else {
// Missing Boxes
print("Missing Information!")
}
}
希望这对以后的人有帮助！