JTAppleCalendar以编程方式，单元格未显示

Question

我正在尝试使用Xib文件为单元格以编程方式在没有情节提要的情况下实现JTAppleCalendar。我已经设置了委托和数据源，并实现了所需的功能，但是未显示单元格。我可以看到集合视图已建立并且在Viewcontroller中可见（链接2中图像中的蓝色方块），并且调用了configureCalendar（）和cellForItemAt（），但仍未显示任何数据。

我想念什么？

    var calendarView: JTAppleCalendarView!

  override func viewDidLoad() {
    super.viewDidLoad()

    calendarView = JTAppleCalendarView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
    calendarView.register(CalendarCellView.self, forCellWithReuseIdentifier: "cell")
    calendarView.ibCalendarDelegate = self
    calendarView.ibCalendarDataSource = self
    self.view.addSubview(calendarView)
    self.view.bringSubview(toFront: calendarView)
    self.calendarView.backgroundColor = UIColor.blue
}

extension TestViewController: JTAppleCalendarViewDataSource {
   func configureCalendar(_ calendar: JTAppleCalendarView) -> ConfigurationParameters {
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyy MM dd"

    let startDate = formatter.date(from: "2016 02 01")! // You can use date generated from a formatter
    let endDate = Date()                                // You can also use dates created from this function
    let parameters = ConfigurationParameters(startDate: startDate,
                                             endDate: endDate,
                                             numberOfRows: 6, // Only 1, 2, 3, & 6 are allowed
        calendar: Calendar.current,
        generateInDates: .forAllMonths,
        generateOutDates: .tillEndOfGrid,
        firstDayOfWeek: .sunday)
    return parameters
}

func calendar(_ calendar: JTAppleCalendarView, willDisplay cell: JTAppleCell, forItemAt date: Date, cellState: CellState, indexPath: IndexPath) {

    }
}

extension TestViewController: JTAppleCalendarViewDelegate {
  func calendar(_ calendar: JTAppleCalendarView, cellForItemAt date: Date, cellState: CellState, indexPath: IndexPath) -> JTAppleCell {

    let cell = calendar.dequeueReusableJTAppleCell(withReuseIdentifier: "cell", for: indexPath) as! CalendarCellView
    cell.dayLabel?.text = cellState.text
    print(cellState.text)

    return cell
  }  
}



class CalendarCellView: JTAppleCell {

@IBOutlet var dayLabel: UILabel!
@IBOutlet var taskImage: UIImageView!

override func awakeFromNib() {
    dayLabel.textColor = UIColor.red
    self.backgroundColor = UIColor.blue
  }   
}

screenschot of xib cell

screenshot of how the collectionview currently looks

Answer 1

布局

JTAppleCalendarView的超类是UICollectionView，它使用UICollectionViewFlowLayout来布局项目。JTAppleCalendarView提供了CellSize来配置项目大小，您也可以可以使用UICollectionViewFlowLayout来配置Min Spacing。

使用自定义单元格

我猜您正在使用xib自定义单元格，因此您必须使用register(_ nib: UINib?, forCellWithReuseIdentifier identifier: String)来注册单元格。最后，不要忘记为dayLabel添加约束。

示例

calendarView的像元大小为40，宽度为280（7列），高度为240（六行），像元和行的最小间距为0。

Answer 2

这是一种通过可能对您有用的代码来实现JTAppleCalendar的可能方法：

注意：这只是让一切正常运行的起点，您可以根据自己的需要进行进一步的定制

JTAppleCalendar版本：8.0.3

在viewDidLoad中：

let cal = JTACMonthView(frame: CGRect.zero)
        cal.backgroundColor = .white
        cal.cellSize = 20
        cal.calendarDelegate = self
        cal.calendarDataSource = self
        cal.register(DateCell.self, forCellWithReuseIdentifier: "calenderCellID")
        view.addSubview(cal)
        cal.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([cal.centerXAnchor.constraint(equalTo: view.centerXAnchor),
                                     cal.topAnchor.constraint(equalTo: view.topAnchor),
                                     cal.widthAnchor.constraint(equalToConstant: 200),
                                     cal.heightAnchor.constraint(equalToConstant: 200)])

自定义单元格：

class DateCell: JTACDayCell {
    var dateLabel : UILabel = {
        let dateLabel = UILabel()
        dateLabel.text = "sample"
        return dateLabel
    }()
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        addSubview(dateLabel)
        dateLabel.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([dateLabel.centerXAnchor.constraint(equalTo: centerXAnchor),
                                    dateLabel.centerYAnchor.constraint(equalTo: centerYAnchor),
                                    dateLabel.heightAnchor.constraint(equalToConstant: 15)])
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

最后的数据源和委托方法：

func calendar(_ calendar: JTACMonthView, cellForItemAt date: Date, cellState: CellState, indexPath: IndexPath) -> JTACDayCell {
        let cell = calendar.dequeueReusableCell(withReuseIdentifier: calenderCellID, for: indexPath) as! DateCell
        cell.dateLabel.text = cellState.text
        return cell
    }
    
    func configureCalendar(_ calendar: JTACMonthView) -> ConfigurationParameters {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy MM dd"
        
        let startDate = formatter.date(from: "2016 02 01")!
        let endDate = Date()
        let parameters = ConfigurationParameters(startDate: startDate,
                                                 endDate: endDate,
                                                 numberOfRows: 6, // Only 1, 2, 3, & 6 are allowed
                                                 calendar: Calendar.current,
                                                 generateInDates: .forAllMonths,
                                                 generateOutDates: .tillEndOfGrid,
                                                 firstDayOfWeek: .sunday)
        return parameters
    }
    
    func calendar(_ calendar: JTACMonthView, willDisplay cell: JTACDayCell, forItemAt date: Date, cellState: CellState, indexPath: IndexPath) {
        let cell = cell as! DateCell
        cell.dateLabel.text = cellState.text
    }

注意：根据this：

这两个函数应该包含相同的代码，因此是明智的 具有共享功能以减少代码重复。唯一的 这两个功能之间的区别应该是第一行 代码（出队代码）。

陈述的功能是：

1. func calendar(_ calendar: JTACMonthView, cellForItemAt date: Date, cellState: CellState, indexPath: IndexPath)
2. func calendar(_ calendar: JTACMonthView, willDisplay cell: JTACDayCell, forItemAt date: Date, cellState: CellState, indexPath: IndexPath)