如何将@published 和@observed 与FSCalendar 一起使用？

Posted 2023-02-24

【中文标题】如何将@published 和@observed 与FSCalendar 一起使用？

【英文标题】：how to use @published and @observed with FSCalendar?

【发布时间】：2020-11-02 05:21:52

【问题描述】：

如何从 FSCalendar 中获取例如 selectedDate？

struct CalendarController: UIViewControllerRepresentable 
    
    func makeCoordinator() -> Coordinator 
        Coordinator(self)
    
    
    
    func makeUIViewController(context: UIViewControllerRepresentableContext<CalendarController>) 
        -> calendars 
        let calendarViewController = calendars()
        return calendarViewController
    
    
    func updateUIViewController(_ uiViewController: calendars, context: 
    UIViewControllerRepresentableContext<CalendarController>) 
    

    
    func updateUIViewController(_ uiViewController: CalendarController, context: 
    UIViewControllerRepresentableContext<CalendarController>) 
    

    class Coordinator: NSObject 
        var parent: CalendarController
        init(_ calendarViewController: CalendarController) 
            self.parent = calendarViewController
        
    


class calendars: UIViewController, FSCalendarDelegate, ObservableObject  
    var calendar = FSCalendar()
    @Published var selectedData : Date?
    
    override func viewDidLoad() 
        super.viewDidLoad()
        
        calendar.delegate = self
    

    override func viewDidLayoutSubviews() 
        super.viewDidLayoutSubviews()
        calendar.frame = CGRect(x: 0, y: 0, width: view.frame.size.width, height: 
    view.frame.size.width)
        view.addSubview(calendar)
    
    
    func calendar(_ calendar: FSCalendar, didSelect date: Date, at monthPosition: 
    FSCalendarMonthPosition)  
        print("didSelect date: \(date)")
        selectedData = date
    


struct CalendarView: View 
  
    var body: some View
        CalendarController().padding().frame(alignment: .top)
    
    


    struct Calendar_Previews: PreviewProvider 
    static var previews: some View 
        CalendarView()
        
    

稍后在另一个快速视图中，我尝试获取日期，但它从未更改过。 我用的

@ObservedObject var calendarData = calendars()

//...

CalendarView().scaledToFit()
Text("\(self.calendarData.selectedData ?? Date())")

【问题讨论】：

我认为将视图控制器作为 ios 中的观察对象并不是一个好主意。在您的示例中，您正在代码中创建视图控制器的新实例，因此这不是您要更改的实例，因为我假设它是从情节提要创建的。

是swiftui。我尝试使用 FSCalendar - 在文档中，据说为此使用 UIViewControllerRepresentable 协议。我看到我创建了一个新实例。我没有足够的 iOS 开发经验来让它工作。

【参考方案1】：

以下作品。

由于我是 iOS 新手，所以我很快就搞不懂委托的诀窍。

协调器类应实现它以使其工作。

''' 导入 SwiftUI 导入 UIKit 导入FSCalendar 导入合并

struct CalendarController: UIViewControllerRepresentable

@Binding var selectedDate : Date?

func makeCoordinator() -> CalendarController.Coordinator 
    Coordinator(self)
   

func makeUIViewController(context: Context) -> calendars 
    let calendar = calendars()
    calendar.calendar.delegate = context.coordinator 
    return calendar
   

func updateUIViewController(_ uiViewController: calendars, context: Context) 
   

 

class calendars: UIViewController 
var calendar = FSCalendar()
var selectedDate : Date?

override func viewDidLoad() 
    super.viewDidLoad()
    
    calendar.delegate = self // delegate


override func viewDidLayoutSubviews() 
    super.viewDidLayoutSubviews()
    calendar.frame = CGRect(x: 0, y: 0, width: view.frame.size.width, height: 
 view.frame.size.width)
    view.addSubview(calendar)




 extension CalendarController 
 class Coordinator: NSObject, FSCalendarDelegate 
    var parent: CalendarController

    init(_ parent: CalendarController) 
        self.parent = parent
    
    func calendar(_ calendar: FSCalendar, didSelect date: Date, at 
 monthPosition: FSCalendarMonthPosition) 
        print(date)
        parent.selectedDate = date
    

 
 

'''