将当前日期更改为一个之前/一个之后-Swift日期选择器
我有一个约会挑选员。我想将显示的日期更改为使用手势控制之前或之后的日期。也就是说,当一个人向左滑动时,日期会推迟一天;如果一个人向右滑动,日期会推迟一天。我不知道如何实现这一点,因为我已经尝试了下面的方法,但我得到一个错误,声明“无法将类型为“UITextField”的值转换为预期的参数类型“Date”。如果有人能帮我或者给我指出正确的方向,我会非常感激!谢谢 视图控制器:将当前日期更改为一个之前/一个之后-Swift日期选择器,swift,nsdate,uidatepicker,uiswipegesturerecognizer,Swift,Nsdate,Uidatepicker,Uiswipegesturerecognizer,我有一个约会挑选员。我想将显示的日期更改为使用手势控制之前或之后的日期。也就是说,当一个人向左滑动时,日期会推迟一天;如果一个人向右滑动,日期会推迟一天。我不知道如何实现这一点,因为我已经尝试了下面的方法,但我得到一个错误,声明“无法将类型为“UITextField”的值转换为预期的参数类型“Date”。如果有人能帮我或者给我指出正确的方向,我会非常感激!谢谢 视图控制器: @IBOutlet weak var userDate: UITextField! private var
@IBOutlet weak var userDate: UITextField!
private var datePicker: UIDatePicker?
override func viewDidLoad() {
super.viewDidLoad()
datePicker = UIDatePicker()
datePicker?.datePickerMode = .date
datePicker?.addTarget(self, action: #selector(Test.dateChanged(datePicker:)), for: .valueChanged)
userDate.inputView = datePicker
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "EEEE, MMM d, yyyy"
let todayDate = dateFormatter.string(from: Date.init())
self.userDate.text = todayDate
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeLeft.direction = .left
self.view.addGestureRecognizer(swipeLeft)
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeRight.direction = .right
self.view.addGestureRecognizer(swipeRight)
}
@objc func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
if gesture.direction == UISwipeGestureRecognizer.Direction.right {
print("Swipe Right")
view.backgroundColor = .black
// WHERE I WOULD LIKE TO CHANGE THE DATE ONE DAY AFTER
}
else if gesture.direction == UISwipeGestureRecognizer.Direction.left {
print("Swipe Left")
view.backgroundColor = .yellow
// WHERE I WOULD LIKE TO CHANGE THE DATE ONE DAY BEFORE
}
}
我尝试了此方法,但这就是我得到错误的原因:
Calendar.current.date(byAdding: .day, value: 1, to: userDate)!
函数date(通过添加:value:to:options:)
要求将日期类型作为参数传递。您传递的是UITextField,而不是日期类型。
我想你想做的是
Calendar.current.date(byAdding: .day, value: 1, to: datePicker.date)!
函数date(通过添加:value:to:options:)
要求将日期类型作为参数传递。您传递的是UITextField,而不是日期类型。
我想你想做的是
Calendar.current.date(byAdding: .day, value: 1, to: datePicker.date)!
您正在尝试设置一个textField,该方法在此处预期日期:
Calendar.current.date(byAdding: .day, value: 1, to: userDate)!
从您的问题来看,您似乎想从文本字段中显示的当前日期中增加或减少一天。请尝试以下代码来实现这一点。这将从userDate.text中获取日期,并根据滑动方向将userDate.text设置为新值,添加或减去一天
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var userDate: UITextField!
private var datePicker: UIDatePicker?
private let dateFormatter = DateFormatter()
override func viewDidLoad() {
super.viewDidLoad()
datePicker = UIDatePicker()
datePicker?.datePickerMode = .date
// datePicker?.addTarget(self, action: #selector(Test.dateChanged(datePicker:)), for: .valueChanged)
userDate.inputView = datePicker
dateFormatter.dateFormat = "EEEE, MMM d, yyyy"
let todayDate = dateFormatter.string(from: Date.init())
self.userDate.text = todayDate
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeLeft.direction = .left
self.view.addGestureRecognizer(swipeLeft)
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeRight.direction = .right
self.view.addGestureRecognizer(swipeRight)
}
@objc func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
if gesture.direction == UISwipeGestureRecognizer.Direction.right {
print("Swipe Right")
// WHERE I WOULD LIKE TO CHANGE THE DATE ONE DAY AFTER
let date = dateFormatter.date (from: userDate.text ?? dateFormatter.string(from: Date()))!
let plusDay = Calendar.current.date(byAdding: .day, value: 1, to: date)!
userDate.text = dateFormatter.string(from: plusDay)
}
else if gesture.direction == UISwipeGestureRecognizer.Direction.left {
print("Swipe Left")
// WHERE I WOULD LIKE TO CHANGE THE DATE ONE DAY BEFORE
let date = dateFormatter.date (from: userDate.text ?? dateFormatter.string(from: Date()))!
let minusDay = Calendar.current.date(byAdding: .day, value: -1, to: date)!
userDate.text = dateFormatter.string(from: minusDay)
}
}
}
您正在尝试设置一个textField,该方法在此处预期日期:
Calendar.current.date(byAdding: .day, value: 1, to: userDate)!
从您的问题来看,您似乎想从文本字段中显示的当前日期中增加或减少一天。请尝试以下代码来实现这一点。这将从userDate.text中获取日期,并根据滑动方向将userDate.text设置为新值,添加或减去一天
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var userDate: UITextField!
private var datePicker: UIDatePicker?
private let dateFormatter = DateFormatter()
override func viewDidLoad() {
super.viewDidLoad()
datePicker = UIDatePicker()
datePicker?.datePickerMode = .date
// datePicker?.addTarget(self, action: #selector(Test.dateChanged(datePicker:)), for: .valueChanged)
userDate.inputView = datePicker
dateFormatter.dateFormat = "EEEE, MMM d, yyyy"
let todayDate = dateFormatter.string(from: Date.init())
self.userDate.text = todayDate
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeLeft.direction = .left
self.view.addGestureRecognizer(swipeLeft)
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.handleGesture(gesture:)))
swipeRight.direction = .right
self.view.addGestureRecognizer(swipeRight)
}
@objc func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
if gesture.direction == UISwipeGestureRecognizer.Direction.right {
print("Swipe Right")
// WHERE I WOULD LIKE TO CHANGE THE DATE ONE DAY AFTER
let date = dateFormatter.date (from: userDate.text ?? dateFormatter.string(from: Date()))!
let plusDay = Calendar.current.date(byAdding: .day, value: 1, to: date)!
userDate.text = dateFormatter.string(from: plusDay)
}
else if gesture.direction == UISwipeGestureRecognizer.Direction.left {
print("Swipe Left")
// WHERE I WOULD LIKE TO CHANGE THE DATE ONE DAY BEFORE
let date = dateFormatter.date (from: userDate.text ?? dateFormatter.string(from: Date()))!
let minusDay = Calendar.current.date(byAdding: .day, value: -1, to: date)!
userDate.text = dateFormatter.string(from: minusDay)
}
}
}