iOS Swift：选择一个我想选择整行的单元格

Question

我有一个日历，当我选择一天时，我想选择整行（一周）。这是到目前为止的代码：

//When a date is selected
func calendar(_ calendar: JTAppleCalendarView, didSelectDate date: Date, cell: JTAppleCell?, cellState: CellState) {

    selectTheWeek(of: date)
    setupLayoutCell(cell: cell, cellState: cellState)

}

func selectTheWeek(of date: Date) {
    let starOfTheWeek = date.startOfWeek()
    let endOfTheWeeK = date.endOfWeek()
    calendarCollectionView.selectDates(from: starOfTheWeek, to: endOfTheWeeK)
}

extension Date {
func startOfWeek() -> Date {
    let calendar = Calendar.autoupdatingCurrent
    let currentDateComponents = calendar.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self)
    return calendar.date(from: currentDateComponents)!
}

func endOfWeek() -> Date {
    let cal = Calendar.autoupdatingCurrent
    var component = DateComponents()
    component.weekOfYear = 1
    component.day = -1
    return cal.date(byAdding: component, to: startOfWeek())!
}
}

问题是我遇到了无限循环，原因很明显。 但是我不知道如何预防。 有什么帮助吗？

JTAppleCalender是一个外部库。 它是collectionView的扩展。

Answer 1

您可以使用2种技巧来打破循环。

首先 ：

calendarViewselectDates(from: starOfTheWeek, to: endOfTheWeeK, triggerSelectionDelegate: false)

通过将triggerSelectionDelegate设置为false，将不会调用您的委托函数didSelect 。

---

第二：

如果您使用的是MasterBranch代码（我将在一周左右的时间内发布该代码），则可以知道您的选择是否是程序员发起的还是 用户发起的 。 您知道-> cellState。

if cellState.selectionType == .programatic {
   // ignore stuff        
} else {
   // Do stuff
}

您可以将此if语句放入shouldSelect函数中。

Answer 2

我知道这不是最好的解决方案，但可以避免出现问题

//When a date is selected
var shouldSelectWeek = true
func calendar(_ calendar: JTAppleCalendarView, didSelectDate date: Date, cell: JTAppleCell?, cellState: CellState) {
    if shouldSelectWeek{
        selectTheWeek(of: date)
        shouldSelectWeek = false
    }
    setupLayoutCell(cell: cell, cellState: cellState)


}

func selectTheWeek(of date: Date) {
    let starOfTheWeek = date.startOfWeek()
    let endOfTheWeeK = date.endOfWeek()
    calendarCollectionView.selectDates(from: starOfTheWeek, to: endOfTheWeeK)
}

extension Date {
    func startOfWeek() -> Date {
        let calendar = Calendar.autoupdatingCurrent
        let currentDateComponents = calendar.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self)
        return calendar.date(from: currentDateComponents)!
    }

    func endOfWeek() -> Date {
        let cal = Calendar.autoupdatingCurrent
        var component = DateComponents()
        component.weekOfYear = 1
        component.day = -1
        return cal.date(byAdding: component, to: startOfWeek())!
}

Answer 3

只需添加一个新的布尔变量，如var shouldIgnoreDateSelection = false ，然后就可以了

func calendar(_ calendar: JTAppleCalendarView, didSelectDate date: Date, cell: JTAppleCell?, cellState: CellState) {
    if shouldIgnoreDateSelection == false {
        selectTheWeek(of: date)
    }
    setupLayoutCell(cell: cell, cellState: cellState)
}

func selectTheWeek(of date: Date) {
    let starOfTheWeek = date.startOfWeek()
    let endOfTheWeeK = date.endOfWeek()
    shouldIgnoreDateSelection = true
    calendarCollectionView.selectDates(from: starOfTheWeek, to: endOfTheWeeK)
    shouldIgnoreDateSelection = false
}