Swift CVCalendar 没有更新 monthLabel

Question

我最近开始使用 CVCalendar 创建一个带有 Week 演示文稿的 CalendarView。

我创建了一个名为 monthLabel 的 UILabel，它有一个视图控制器的出口

这个特定视图的 ViewController 是这个：

import UIKit
import CVCalendar

class EventsViewController: UIViewController {
    @IBOutlet weak var headerView: UIView!
    @IBOutlet weak var menuView: CVCalendarMenuView!
    @IBOutlet weak var calendarView: CVCalendarView!
    @IBOutlet weak var eventsTable: UITableView!
    @IBOutlet weak var monthLabel: UILabel!
    
    private var currentCalendar: Calendar?
    private var animationFinished: Bool = true
    
    let mainAppViewHeader: MainAppViewHeader = UIView.fromNib()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        loadViewHeader()
        setupTable()
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()

        setupDatePicker()
    }
    
    override func awakeFromNib() {
        let timeZoneBias = 480 // (UTC+08:00)
        currentCalendar = Calendar(identifier: .gregorian)
        currentCalendar?.locale = Locale(identifier: "fr_FR")
        if let timeZone = TimeZone(secondsFromGMT: -timeZoneBias * 60) {
            currentCalendar?.timeZone = timeZone
        }
    }
    
    func setupDatePicker() {
        menuView.delegate = self
        calendarView.delegate = self
        
        menuView.backgroundColor = ColorManager.Gray5
        calendarView.backgroundColor = ColorManager.Gray5
        
        calendarView.appearance.dayLabelPresentWeekdaySelectedBackgroundColor = ColorManager.PrimaryColor
        calendarView.appearance.dayLabelWeekdaySelectedBackgroundColor = ColorManager.PrimaryColor
        
        if let currentCalendar = currentCalendar {
            monthLabel.text = CVDate(date: Date(), calendar: currentCalendar).globalDescription
        }
        
        menuView.commitMenuViewUpdate()
        calendarView.commitCalendarViewUpdate()
    }
    
    func loadViewHeader() {
        mainAppViewHeader.setupHeader()
        headerView.addSubview(mainAppViewHeader)
    }
    
    func setupTable() {
        let rowNib = UINib(nibName: "EventTableCell", bundle: nil)
        
        eventsTable.dataSource = self
        eventsTable.delegate = self
        
        eventsTable.register(rowNib, forCellReuseIdentifier: "eventCell")
        eventsTable.separatorStyle = .none
    }
}

extension EventsViewController: CVCalendarViewDelegate, CVCalendarMenuViewDelegate {
    func presentationMode() -> CalendarMode {
        return .weekView
    }
    
    func firstWeekday() -> Weekday {
        return .sunday
    }
    
    func shouldAutoSelectDayOnWeekChange() -> Bool {
        return true
    }
    
    func disableScrollingBeforeDate() -> Date {
        let currentDate = Date()
        return currentDate.addingTimeInterval(-8 * 24 * 60 * 60)
    }
    
    func disableScrollingBeyondDate() -> Date {
        let currentDate = Date()
        return currentDate.addingTimeInterval(180 * 24 * 60 * 60)
    }
    
    func maxSelectableRange() -> Int {
        return 1
    }
    
    func shouldSelectRange() -> Bool {
        false
    }
    
    func earliestSelectableDate() -> Date {
        let currentDate = Date()
        return currentDate.addingTimeInterval(-8 * 24 * 60 * 60)
    }
    
    func latestSelectableDate() -> Date {
        let currentDate = Date()
        return currentDate.addingTimeInterval(180 * 24 * 60 * 60)
    }
    
    func shouldShowWeekdaysOut() -> Bool {
        return true
    }
    
    func didShowPreviousWeekView(from startDayView: DayView, to endDayView: DayView) {
        print(startDayView, endDayView)
    }
    
    func presentedDateUpdated(_ date: CVDate) {
        monthLabel.text = "asdf" //calendarView.presentedDate.globalDescription
        print(date.globalDescription)
    }
}

extension EventsViewController: UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 3
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let eventCell = tableView.dequeueReusableCell(withIdentifier: "eventCell") as? EventTableCell else {
            return UITableViewCell()
        }
        
        eventCell.setupCell()
        eventCell.updateConstraintsIfNeeded()
        
        return eventCell
    }
}

extension EventsViewController: UITableViewDelegate {
    
}

出口参考：

这里的问题是，即使我告诉 UILabel 在显示日期更新时更改其文本：

func presentedDateUpdated(_ date: CVDate) {
    monthLabel.text = "asdf" //calendarView.presentedDate.globalDescription
    print(date.globalDescription)
}

它没有更新它的值，但我在控制台中打印了 date.globalDescription 值。

我在尝试更新标签时是否遗漏了什么？

我尝试使用 official example 中的代码：

func presentedDateUpdated(_ date: CVDate) {
    if monthLabel.text != date.globalDescription && self.animationFinished {
        let updatedMonthLabel = UILabel()
        updatedMonthLabel.textColor = monthLabel.textColor
        updatedMonthLabel.font = monthLabel.font
        updatedMonthLabel.textAlignment = .center
        updatedMonthLabel.text = date.globalDescription
        updatedMonthLabel.sizeToFit()
        updatedMonthLabel.alpha = 0
        updatedMonthLabel.center = self.monthLabel.center
        
        let offset = CGFloat(48)
        updatedMonthLabel.transform = CGAffineTransform(translationX: 0, y: offset)
        updatedMonthLabel.transform = CGAffineTransform(scaleX: 1, y: 0.1)
        
        UIView.animate(withDuration: 0.35, delay: 0, options: UIView.AnimationOptions.curveEaseIn, animations: {
            self.animationFinished = false
            self.monthLabel.transform = CGAffineTransform(translationX: 0, y: -offset)
            self.monthLabel.transform = CGAffineTransform(scaleX: 1, y: 0.1)
            self.monthLabel.alpha = 0
            
            updatedMonthLabel.alpha = 1
            updatedMonthLabel.transform = CGAffineTransform.identity
            
        }) { _ in
            
            self.animationFinished = true
            self.monthLabel.frame = updatedMonthLabel.frame
            self.monthLabel.text = updatedMonthLabel.text
            self.monthLabel.transform = CGAffineTransform.identity
            self.monthLabel.alpha = 1
            updatedMonthLabel.removeFromSuperview()
        }
        
        self.view.insertSubview(updatedMonthLabel, aboveSubview: self.monthLabel)
    }
}

但这种方法只是推送一个包含更新月份的新视图，然后关闭该视图，虽然它包含的代码与我使用的代码基本相同：

self.monthLabel.text = updatedMonthLabel.text

monthLabel没有被更新，这是使用上面代码时发生的情况，它恢复为原始文本。

如果我删除这一行：

updatedMonthLabel.removeFromSuperview()

两个文本重叠，因此它忽略了这一行：

self.monthLabel.text = updatedMonthLabel.text

我做了一些额外的测试，并检查了标签是否正确链接到我的视图，我更改了文本颜色：

func presentedDateUpdated(_ date: CVDate) {
        print(Thread.current)
        print("Wololo")
        monthLabel.textColor = UIColor.green
        monthLabel.text = "asdf"
//        calendarView.contentController.refreshPresentedMonth()
//        monthLabel.text = "asdf" //calendarView.presentedDate.globalDescription
//        print(date.globalDescription)
    }

它打印：

<NSThread: 0x600002b6c100>{number = 1, name = main}
Wololo

N 次我通过单击日历更改日期，但文本保持不变：

Answer 1

presentedDateUpdated 可能在后台线程上被调用，因此您的 UI 更改不会显示。您可以通过在 presentedDateUpdated.

中打印 Thread.current 来确认这一点

一个简单的解决方案是这样的：

func presentedDateUpdated(_ date: CVDate) {
    DispatchQueue.main.async { [weak self] in
        self?.monthLabel.text = "asdf" //calendarView.presentedDate.globalDescription
        print(date.globalDescription)
    }
}

Answer 2

出于某种原因，里面的代码：

override func awakeFromNib() {
    let timeZoneBias = 480 // (UTC+08:00)
    currentCalendar = Calendar(identifier: .gregorian)
    currentCalendar?.locale = Locale(identifier: "fr_FR")
    if let timeZone = TimeZone(secondsFromGMT: -timeZoneBias * 60) {
        currentCalendar?.timeZone = timeZone
    }
}

与不更新标签有冲突，如果我们删除上面的代码并改为这样做：

func setupDatePicker() {
    menuView.delegate = self
    calendarView.delegate = self
    
    menuView.commitMenuViewUpdate()
    calendarView.commitCalendarViewUpdate()
    
    monthLabel.text = calendarView.presentedDate.globalDescription //This line at the bottom of this method
}

一切再次正常。

如果有人知道背后的原因，请随时发表评论，我会添加到答案中。

Swift CVCalendar 没有更新 monthLabel

Swift CVCalendar not updating monthLabel

uilabel

ios

swift

cvcalendar