大佬教程收集整理的这篇文章主要介绍了将当前日期更改为一个之前/一个之后 - Swift DatePicker，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
我有一个日期选择器。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。即，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，则日期会推迟一天。我不知道如何实现这一点，因为我已经尝试了下面的方法，但我收到一条错误消息，指出“无法转换‘UITextFIEld 类型的值？’到预期的参数类型“日期”。如果有人可以帮助我或为我指明正确的方向，我将不胜感激！谢谢
视图控制器：
@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
}
}
Calendar.current.date(byAdding: .day,value: 1,to: userDatE)!
函数 date(byAdding:value:to:options:) 期望将日期类型作为参数传递。您正在传递 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文本字段，该方法在此处需要一个日期：
Calendar.current.date(byAdding: .day,to: userDatE)!
从您的问题来看，您似乎想从 textField 中显示的当前日期中添加或减去一天。尝试以下代码来做到这一点。这从 userDate.text 获取日期，并根据将 userDate.text 设置为新值的滑动方向添加或减去一天。
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,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)
}
}
}
以上是大佬教程为你收集整理的将当前日期更改为一个之前/一个之后 - Swift DatePicker全部内容，希望文章能够帮你解决将当前日期更改为一个之前/一个之后 - Swift DatePicker所遇到的程序开发问题。
如果觉得大佬教程网站内容还不错，欢迎将大佬教程推荐给程序员好友。
本图文内容来源于网友网络收集整理提供，作为学习参考使用，版权属于原作者。
如您有任何意见或建议可联系处理。小编QQ：384754419，请注明来意。