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好吧,所以我想學習XCode 8中的Swift 3。我遵循了一些教程,並且正在嘗試構建我自己的應用程序,它可以讓我保存事件日期和類別。將核心數據保存到核心數據
現在我很難將日期保存到核心數據。最重要的是,我想在UITextfield中顯示完整的日期樣式,但將其保存爲核心數據中的短日期樣式。
有沒有人有解決方案?並且請注意,我是一個n00b,我沒有接受所有正確的術語。所以請告訴我我需要改變什麼,因爲我仍然在學習所有不同的東西......
我認爲我應該做的是創建一個函數,它將格式化字符串以保存核心數據(實體'MyEvents'的屬性'dateOfEvent'設置爲'date'),然後從datePickerChanged函數調用它,以保持它始終更新。
我已經拿出這個到目前爲止,這是從我找到的不同教程組合。
import UIKit
class addEventViewController: UIViewController, UITextFieldDelegate, UIPickerViewDataSource, UIPickerViewDelegate {
@IBOutlet weak var addEventNameInput: UITextField!
@IBOutlet weak var addEventDateInput: UITextField!
@IBOutlet weak var addEventCategoryInput: UITextField!
var addEventCategories = ["Født", "Startede børnehave", "Startede uddannelse", "Startede job", "Flyttede hjemmefra", "Startede romantisk forhold", "Startede forhold"]
var categoryPicker = UIPickerView()
let datePicker = UIDatePicker()
func textFieldDidBeginEditing(_ textField: UITextField) {
addEventDateInput.inputView = datePicker
datePicker.datePickerMode = .date
datePicker.addTarget(self, action: #selector(datePickerChanged), for: .valueChanged)
}
func datePickerChanged(sender: UIDatePicker) {
let formatter = DateFormatter()
formatter.dateStyle = .full
formatter.timeStyle = .none
addEventDateInput.text = formatter.string(from: sender.date)
}
override func viewDidLoad() {
super.viewDidLoad()
addEventNameInput.delegate = self
addEventDateInput.delegate = self
categoryPicker.delegate = self
categoryPicker.dataSource = self
addEventCategoryInput.inputView = categoryPicker
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
// returns the number of 'columns' to display.
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
// returns the # of rows in each component..
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return addEventCategories.count
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
addEventCategoryInput.text = addEventCategories[row]
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return addEventCategories[row]
}
@IBAction func addEventButtonPressed(_ sender: Any) {
if addEventNameInput.text == "" {
} else {
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let newevent = MyEvents(context: context)
newevent.nameOfevent = addEventNameInput.text!
newevent.categoryOfevent = addEventCategoryInput.text!
// Save data to coredata
(UIApplication.shared.delegate as! AppDelegate).saveContext()
// Pop back to events list
navigationController!.popViewController(animated: true)
}
}
}
所以你有一個名爲'dateOfEvent'的'NSManagedObject'作爲'MyEvents'的一部分,對吧?您應該可以通過說'new event.dateOfEvent = datePicker.date'來設置當前日期與datePicker的值。 – Pierce
謝謝,皮爾斯! 這確實保存日期,但它也節省時間。我只想要日期:-) – Polle
@Polle沒有「僅限日期」。將實際日期保存到數據庫中,並使用日期格式化程序將這些值顯示給用戶。 – jrturton