Ios Swift 3中的JTAppleCalendar单元格背景颜色更改错误

我在我的项目中使用

JTAppleCalendar

，你可以在这里看到它->。但当我想改变某些单元格的背景色时，会给我带来一个大问题，当我过去几个月和下个月某些单元格的背景色发生变化时

这怎么可能？我怎样才能修好它？我只想改变；榜样

let fetchRequest=NSFetchRequest（entityName:“Mains”）
let predicate=NSPredicate（格式：“日期=%@”，freshdate）
fetchRequest.predicate=谓词
如果让结果=尝试？context.fetch（fetchRequest）as！[电源]{
对于结果中的对象{
如果（object.user！==“”

一个，但当我再过一个月，在日历中，一些单元格的背景发生了变化

下面的图片显示了应用程序打开时的真实情况

但当我上个月或下个月改变了下面的一些单元格背景。这是一个错误。我不想改变这一点

下面是我的代码，哪里会出错

@IBOutlet weak var calendarView: JTAppleCalendarView!
let kStartDate = "2016-01-01"
let kEndDate = "2049-12-31"
var numberOfRows = 6
let formatter = DateFormatter()
var myCalendar = Calendar(identifier: .gregorian)
var generateInDates: InDateCellGeneration = .forAllMonths
var generateOutDates: OutDateCellGeneration = .off
var hasStrictBoundaries = true
let firstDayOfWeek: DaysOfWeek = .monday
var monthSize: MonthSize? = nil

extension ViewController: JTAppleCalendarViewDelegate, JTAppleCalendarViewDataSource {
   func configureCalendar(_ calendar: JTAppleCalendarView) -> ConfigurationParameters {
      formatter.dateFormat = "yyyy-MM-dd"
      formatter.timeZone = TimeZone(secondsFromGMT: 0)
      formatter.locale = Locale(identifier: "en_US")

      let startDate = formatter.date(from: kStartDate)!
      let endDate = formatter.date(from: kEndDate)!      
      let parameters = ConfigurationParameters(startDate: startDate,
                                                     endDate: endDate,
                                                     numberOfRows: numberOfRows,
                                                     calendar: myCalendar,
                                                     generateInDates: generateInDates,
                                                     generateOutDates: generateOutDates,
                                                     firstDayOfWeek: firstDayOfWeek,
                                                     hasStrictBoundaries: hasStrictBoundaries)
      return parameters
   }

   func calendar(_ calendar: JTAppleCalendarView, cellForItemAt date: Date, cellState: CellState, indexPath: IndexPath) -> JTAppleCell {
        let cell = calendar.dequeueReusableCell(withReuseIdentifier: "CellView", for: indexPath) as! CellView
        let comedate = String(describing: myCalendar.date(byAdding: .day, value: 1, to: cellState.date))
        var freshdate = comedate.substring(from: 9)
        freshdate = freshdate.substring(to: 10)

        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName:"Mains")
        let predicate = NSPredicate (format:"date = %@",freshdate)
        fetchRequest.predicate = predicate

        if let result = try? context.fetch(fetchRequest) as! [Mains] {
            for object in result {
                if(object.user! == "" < freshdate) {
                   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
                } else if(object.userme! == "") {
                   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
                } else {
                   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "ffffff")
                }
            }
        }

        handleCellConfiguration(cell: cell, cellState: cellState)
        return cell
   }
}

@ibvar日历视图：JTAppleCalendarView！
让kStartDate=“2016-01-01”
让kEndDate=“2049-12-31”
var numberOfRows=6
let formatter=DateFormatter（）
var myCalendar=日历（标识符：。公历）
var generateInDates:InDateCellGeneration=.forAllMonths
var generateOutDates:OutDateCellGeneration=.off
var hasStrictBoundaries=true
让firstDayOfWeek:DaysOfWeek=.monday
var monthSize：monthSize？=无
扩展视图控制器：JTAppleCalendarViewDelegate，JTAppleCalendarViewDataSource{
func configureCalendar（uCalendar:JTAppleCalendarView）->ConfigurationParameters{
formatter.dateFormat=“yyyy-MM-dd”
formatter.timeZone=时区（秒自GMT:0）
formatter.locale=locale（标识符：“en_US”）
让startDate=formatter.date（from:kStartDate）！
让endDate=formatter.date（from:kEndDate）！
让参数=配置参数（起始日期：起始日期，
endDate:endDate，
numberOfRows:numberOfRows，
日历：我的日历，
generateInDates：generateInDates，
生成日期：生成日期，
星期一：星期一，
hasStrictBoundaries:hasStrictBoundaries）
返回参数
}
func日历（日历：JTAppleCalendarView，cellForItemAt日期：日期，cellState:cellState，indexPath:indexPath）->JTAppleCell{
让cell=calendar.dequeueReusableCell（带有reuseidentifier:“CellView”，for:indexPath）作为！CellView
let cometate=String（描述：myCalendar.date（通过添加：.day，值：1，到：cellState.date））
var freshdate=cometate.substring（from:9）
freshdate=freshdate.substring（to:10）
let fetchRequest=NSFetchRequest（entityName:“Mains”）
let predicate=NSPredicate（格式：“日期=%@”，freshdate）
fetchRequest.predicate=谓词
如果let result=try？context.fetch（fetchRequest）as！[Mains]{
对于结果中的对象{
如果（object.user！==“”

我认为这是重用单元格的问题，您可以尝试设置默认背景色

if freshdate == "2017-04-16" {
   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
} else if freshdate == "2017-04-28" {
   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "45ca6")
} else {
   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "your_color")
}

---

我认为这是重用单元格的问题，您可以尝试设置默认背景色

if freshdate == "2017-04-16" {
   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
} else if freshdate == "2017-04-28" {
   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "45ca6")
} else {
   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "your_color")
}

如前所述，这是一个单元重用问题。但这里还有另一个问题

屏幕上的每个单元格都会调用此函数。简而言之，这就是正在发生的问题

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

    // Here you got one single cell
    let cell = calendar.dequeueReusableCell(withReuseIdentifier: "CellView", for: indexPath) as! CellView

    // Here you got a result for your single cell
    if let result = try? context.fetch(fetchRequest) as! [Mains] {

         // Here you are changing the color of a *single* cell multiple times
         // Based on the number of [objects] found in the [result]
         // Why?
         for object in result {
            if(object.user! == "" < freshdate) {
               cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
            } else if(object.userme! == "") {
               cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
            } else {
               cell.contentView.backgroundColor = hexStringToUIColor(hex:  "ffffff")
            }
        }
    } else { 
         // There will also be a problem here if you data is not found.
         // Your cell background color will just pick up any random re-used color
    }
}

现在，根据数据源中的值，是否要更改单元格的背景色？ 看起来您正在检查

对象.user

，

对象.userme

和

空值

看起来您正在检查任意数据

函数将单元格映射到日期，而不是任意数据。 因此，必须将数据源映射到日期。这可以通过

词典

完成。因此，将数据源更改为如下所示：

let myDataSource: [String: Mains ] = [:]
// The String can be a date string
// The Mains object can be the object associated with that Date

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

    // Here you got one single cell
    let cell = calendar.dequeueReusableCell(withReuseIdentifier: "CellView", for: indexPath) as! CellView

    // Here you got a result for your single cell
    let dateString = dateFormatter.stringFrom(date)
    let myObjectForThisCell = myDataSource[dateString]

    if(myObjectForThisCell.user! == "" < freshdate) {
       cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
    } else if(myObjectForThisCell.userme! == "") {
       cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
    } else {
       cell.contentView.backgroundColor = hexStringToUIColor(hex:  "ffffff")
    }
}

现在，您的

cellForItem

函数可以如下所示：

let myDataSource: [String: Mains ] = [:]
// The String can be a date string
// The Mains object can be the object associated with that Date

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

    // Here you got one single cell
    let cell = calendar.dequeueReusableCell(withReuseIdentifier: "CellView", for: indexPath) as! CellView

    // Here you got a result for your single cell
    let dateString = dateFormatter.stringFrom(date)
    let myObjectForThisCell = myDataSource[dateString]

    if(myObjectForThisCell.user! == "" < freshdate) {
       cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
    } else if(myObjectForThisCell.userme! == "") {
       cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
    } else {
       cell.contentView.backgroundColor = hexStringToUIColor(hex:  "ffffff")
    }
}

func日历（calendar:JTAppleCalendarView，cellForItemAt日期：日期，cellState:cellState，indexPath:indexPath）->JTAppleCell{
//这里有一个单间
让cell=calendar.dequeueReusableCell（带有reuseidentifier:“CellView”，for:indexPath）作为！CellView
//这是您的单个单元格的结果
让dateString=dateFormatter.stringFrom（日期）
让myObjectForThisCell=myDataSource[dateString]
if（myObjectForThisCell.user！==“”

我贴在abov上的代码

 if let result = try? context.fetch(fetchRequest) as! [Mains] {
            for object in result {
                if(object.user! == "" < freshdate) {
                   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
                } else if(object.userme! == "") {
                   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "f7bca6")
                } else {
                   cell.contentView.backgroundColor = hexStringToUIColor(hex:  "ffffff")
                }
            }
        }