Swift 2.1 - 如何更改 uidatepicker 以便它只允许时间而不是日期？

Question

下面的代码允许用户选择一个日期，但我想通过 AM/PM 将其更改为“时间”，因此用户只能选择一个设定时间而不是一个日期。我想要这个分开而不是合并，如果有人能在这里帮助我，我将不胜感激。

import Foundation
import UIKit
import QuartzCore

class DatePickerDialog: UIView {

    typealias DatePickerCallback = (date: NSDate) -> Void

    /* Consts */
    private let kDatePickerDialogDefaultButtonHeight:       CGFloat = 50
    private let kDatePickerDialogDefaultButtonSpacerHeight: CGFloat = 1
    private let kDatePickerDialogCornerRadius:              CGFloat = 7
    private let kDatePickerDialogDoneButtonTag:             Int     = 1

    /* Views */
    private var dialogView:   UIView!
    private var titleLabel:   UILabel!
    private var datePicker:   UIDatePicker!
    private var cancelButton: UIButton!
    private var doneButton:   UIButton!

    /* Vars */
    private var defaultDate:    NSDate?
    private var datePickerMode: UIDatePickerMode?
    private var callback:       DatePickerCallback?


    /* Overrides */
    init() {
        super.init(frame: CGRectMake(0, 0, UIScreen.mainScreen().bounds.size.width, UIScreen.mainScreen().bounds.size.height))

        setupView()
    }

    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    deinit {
        NSNotificationCenter.defaultCenter().removeObserver(self)
    }

    func setupView() {
        self.dialogView = createContainerView()

        self.dialogView!.layer.shouldRasterize = true
        self.dialogView!.layer.rasterizationScale = UIScreen.mainScreen().scale

        self.layer.shouldRasterize = true
        self.layer.rasterizationScale = UIScreen.mainScreen().scale

        self.dialogView!.layer.opacity = 0.5
        self.dialogView!.layer.transform = CATransform3DMakeScale(1.3, 1.3, 1)

        self.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0)

        self.addSubview(self.dialogView!)

        UIApplication.sharedApplication().windows.first!.addSubview(self)
    }

    /* Handle device orientation changes */
    func deviceOrientationDidChange(notification: NSNotification) {
        /* TODO */
    }

    /* Create the dialog view, and animate opening the dialog */
    func show(title: String, datePickerMode: UIDatePickerMode = .Date, callback: DatePickerCallback) {
        show(title, doneButtonTitle: "Done", cancelButtonTitle: "Cancel", datePickerMode: datePickerMode, callback: callback)
    }

    func show(title: String, doneButtonTitle: String, cancelButtonTitle: String, defaultDate: NSDate = NSDate(), datePickerMode: UIDatePickerMode = .Date, callback: DatePickerCallback) {
        self.titleLabel.text = title
        self.doneButton.setTitle(doneButtonTitle, forState: .Normal)
        self.cancelButton.setTitle(cancelButtonTitle, forState: .Normal)
        self.datePickerMode = datePickerMode
        self.callback = callback
        self.defaultDate = defaultDate
        self.datePicker.datePickerMode = self.datePickerMode ?? .Date
        self.datePicker.date = self.defaultDate ?? NSDate()

        /* Anim */
        UIView.animateWithDuration(
            0.2,
            delay: 0,
            options: UIViewAnimationOptions.CurveEaseInOut,
            animations: { () -> Void in
                self.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4)
                self.dialogView!.layer.opacity = 1
                self.dialogView!.layer.transform = CATransform3DMakeScale(1, 1, 1)
            },
            completion: nil
        )
    }

    /* Dialog close animation then cleaning and removing the view from the parent */
    private func close() {
        let currentTransform = self.dialogView.layer.transform

        let startRotation = (self.valueForKeyPath("layer.transform.rotation.z") as? NSNumber) as? Double ?? 0.0
        let rotation = CATransform3DMakeRotation((CGFloat)(-startRotation + M_PI * 270 / 180), 0, 0, 0)

        self.dialogView.layer.transform = CATransform3DConcat(rotation, CATransform3DMakeScale(1, 1, 1))
        self.dialogView.layer.opacity = 1

        UIView.animateWithDuration(
            0.2,
            delay: 0,
            options: UIViewAnimationOptions.TransitionNone,
            animations: { () -> Void in
                self.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0)
                self.dialogView.layer.transform = CATransform3DConcat(currentTransform, CATransform3DMakeScale(0.6, 0.6, 1))
                self.dialogView.layer.opacity = 0
            }) { (finished: Bool) -> Void in
                for v in self.subviews {
                    v.removeFromSuperview()
                }

                self.removeFromSuperview()
        }
    }

    /* Creates the container view here: create the dialog, then add the custom content and buttons */
    private func createContainerView() -> UIView {
        let screenSize = countScreenSize()
        let dialogSize = CGSizeMake(
            300,
            230
                + kDatePickerDialogDefaultButtonHeight
                + kDatePickerDialogDefaultButtonSpacerHeight)

        // For the black background
        self.frame = CGRectMake(0, 0, screenSize.width, screenSize.height)

        // This is the dialog's container; we attach the custom content and the buttons to this one
        let dialogContainer = UIView(frame: CGRectMake((screenSize.width - dialogSize.width) / 2, (screenSize.height - dialogSize.height) / 2, dialogSize.width, dialogSize.height))

        // First, we style the dialog to match the iOS8 UIAlertView >>>
        let gradient: CAGradientLayer = CAGradientLayer(layer: self.layer)
        gradient.frame = dialogContainer.bounds
        gradient.colors = [UIColor(red: 218/255, green: 218/255, blue: 218/255, alpha: 1).CGColor,
            UIColor(red: 233/255, green: 233/255, blue: 233/255, alpha: 1).CGColor,
            UIColor(red: 218/255, green: 218/255, blue: 218/255, alpha: 1).CGColor]

        let cornerRadius = kDatePickerDialogCornerRadius
        gradient.cornerRadius = cornerRadius
        dialogContainer.layer.insertSublayer(gradient, atIndex: 0)

        dialogContainer.layer.cornerRadius = cornerRadius
        dialogContainer.layer.borderColor = UIColor(red: 198/255, green: 198/255, blue: 198/255, alpha: 1).CGColor
        dialogContainer.layer.borderWidth = 1
        dialogContainer.layer.shadowRadius = cornerRadius + 5
        dialogContainer.layer.shadowOpacity = 0.1
        dialogContainer.layer.shadowOffset = CGSizeMake(0 - (cornerRadius + 5) / 2, 0 - (cornerRadius + 5) / 2)
        dialogContainer.layer.shadowColor = UIColor.blackColor().CGColor
        dialogContainer.layer.shadowPath = UIBezierPath(roundedRect: dialogContainer.bounds, cornerRadius: dialogContainer.layer.cornerRadius).CGPath

        // There is a line above the button
        let lineView = UIView(frame: CGRectMake(0, dialogContainer.bounds.size.height - kDatePickerDialogDefaultButtonHeight - kDatePickerDialogDefaultButtonSpacerHeight, dialogContainer.bounds.size.width, kDatePickerDialogDefaultButtonSpacerHeight))
        lineView.backgroundColor = UIColor(red: 198/255, green: 198/255, blue: 198/255, alpha: 1)
        dialogContainer.addSubview(lineView)
        // ˆˆˆ

        //Title
        self.titleLabel = UILabel(frame: CGRectMake(10, 10, 280, 30))
        self.titleLabel.textAlignment = NSTextAlignment.Center
        self.titleLabel.font = UIFont.boldSystemFontOfSize(17)
        dialogContainer.addSubview(self.titleLabel)

        self.datePicker = UIDatePicker(frame: CGRectMake(0, 30, 0, 0))
        self.datePicker.autoresizingMask = UIViewAutoresizing.FlexibleRightMargin
        self.datePicker.frame.size.width = 300
        dialogContainer.addSubview(self.datePicker)

        // Add the buttons
        addButtonsToView(dialogContainer)

        return dialogContainer
    }

    /* Add buttons to container */
    private func addButtonsToView(container: UIView) {
        let buttonWidth = container.bounds.size.width / 2

        self.cancelButton = UIButton(type: UIButtonType.Custom) as UIButton
        self.cancelButton.frame = CGRectMake(
            0,
            container.bounds.size.height - kDatePickerDialogDefaultButtonHeight,
            buttonWidth,
            kDatePickerDialogDefaultButtonHeight
        )
        self.cancelButton.setTitleColor(UIColor(red: 0, green: 0.5, blue: 1, alpha: 1), forState: UIControlState.Normal)
        self.cancelButton.setTitleColor(UIColor(red: 0.2, green: 0.2, blue: 0.2, alpha: 0.5), forState: UIControlState.Highlighted)
        self.cancelButton.titleLabel!.font = UIFont.boldSystemFontOfSize(14)
        self.cancelButton.layer.cornerRadius = kDatePickerDialogCornerRadius
        container.addSubview(self.cancelButton)

        self.doneButton = UIButton(type: UIButtonType.Custom) as UIButton
        self.doneButton.frame = CGRectMake(
            buttonWidth,
            container.bounds.size.height - kDatePickerDialogDefaultButtonHeight,
            buttonWidth,
            kDatePickerDialogDefaultButtonHeight
        )
        self.doneButton.tag = kDatePickerDialogDoneButtonTag
        self.doneButton.setTitleColor(UIColor(red: 0, green: 0.5, blue: 1, alpha: 1), forState: UIControlState.Normal)
        self.doneButton.setTitleColor(UIColor(red: 0.2, green: 0.2, blue: 0.2, alpha: 0.5), forState: UIControlState.Highlighted)
        self.doneButton.titleLabel!.font = UIFont.boldSystemFontOfSize(14)
        self.doneButton.layer.cornerRadius = kDatePickerDialogCornerRadius
        self.doneButton.addTarget(self, action: "buttonTapped:", forControlEvents: UIControlEvents.TouchUpInside)
        container.addSubview(self.doneButton)
    }

    func buttonTapped(sender: UIButton!) {
        if sender.tag == kDatePickerDialogDoneButtonTag {
            self.callback?(date: self.datePicker.date)
        }

        close()
    }

    /* Helper function: count and return the screen's size */
    func countScreenSize() -> CGSize {
        let screenWidth = UIScreen.mainScreen().bounds.size.width
        let screenHeight = UIScreen.mainScreen().bounds.size.height

        return CGSizeMake(screenWidth, screenHeight)
    }

}

这是一个单独的 View Controller 中的 Action 。

@IBAction func datePickerTapped(sender: AnyObject) {
        DatePickerDialog().show("Select Date of Incident", doneButtonTitle: "Done", cancelButtonTitle: "Cancel", datePickerMode: .Date) {
            (date) -> Void in
            let dateFormatter = NSDateFormatter()
            dateFormatter.dateFormat = "dd-MM-yyyy" //format style. you can change according to yours
            let dateString = dateFormatter.stringFromDate(date)
            self.textField3.text = dateString
        } 
    }

Answer 1

如果“分别”是指提示输入日期然后提示时间，您只需再次调用 show 方法并传入适当的 UIDatePickerMode(在本例中为 .Time)并根据您的时间设置格式要求。

像这样:

DatePickerDialog().show("Select Time of Incident", doneButtonTitle: "Done", cancelButtonTitle: "Cancel", datePickerMode: .Time) {
    //format your time accordingly
    //self.textField3.text = timeString
}