arrays - 在 Swift4 中按日期过滤事件

Question

我正在构建一个应用程序，为自闭症 child 提供一个基于预定事件的非常简单的视觉日历。到目前为止，我没有遇到任何重大问题，并且当为每个重复频率(每日、每周、每月、每年)添加第一个事件时，我的事件可以正确过滤。

但是，由于某种原因，当我尝试添加第二个事件(其重复频率与之前添加的任何事件相匹配)时，它将不会填充。

我尝试自行调试并缩小问题范围，但无济于事。我确信我错过了一些非常简单的东西。预先感谢您提供的任何帮助来解决此问题。

此函数按日期过滤整个日期列表:

func filterEvents() {
    filteredEvents = []
    tempEvents = []
    dates = []

    removeOldEvents()
    generateRecurrances()
    extractDates()

    var currentIndex = 0

    for date in dates {
        if filteredEvents.count == 0 {
            filteredEvents.append([])
        }

        else if filteredEvents.count != currentIndex + 1 {
            filteredEvents.append([])
        }

        filteredEvents[currentIndex] = tempEvents.filter({ $0.filterDate() == date })

        currentIndex += 1
    }
}

此函数用于提取必要的信息以按日期过滤:

func extractDates() {
    for event in tempEvents {
        let extractedDate: (month: Int, day: Int, year: Int) = (event.month(), event.day(), event.year())

        dates.append(extractedDate)
    }

    var currentIndex = 0

    for date in dates {
        if currentIndex != 0 {
            if date.month == dates[currentIndex - 1].month && date.day == dates[currentIndex - 1].day && date.year == dates[currentIndex - 1].year {
                dates.remove(at: currentIndex)
                currentIndex -= 1
            }
        }

        currentIndex += 1
    }
}

此函数根据用户在创建原始事件时的偏好生成重复的 future 事件:

func generateRecurrances() {
    var dateComponent = DateComponents()
    var daysToAdd = 0
    var weeksToAdd = 0
    var monthsToAdd = 0
    var yearsToAdd = 0

    for event in events {
        if event.recurrenceFrequency == 1 {
            for _ in 1...60 {
                dateComponent.day = daysToAdd
                dateComponent.month = 0
                dateComponent.year = 0

                let newDate = Calendar.current.date(byAdding: dateComponent, to: event.date)

                tempEvents.append(Event(name: event.name, date: newDate!, image: event.image, completion: event.requiresCompletion, recurrenceFrequency: event.recurrenceFrequency))

                daysToAdd += 1
            }
        }

        else if event.recurrenceFrequency == 2 {
            for _ in 1...8 {
                dateComponent.day = weeksToAdd
                dateComponent.month = 0
                dateComponent.year = 0

                let newDate = Calendar.current.date(byAdding: dateComponent, to: event.date)

                tempEvents.append(Event(name: event.name, date: newDate!, image: event.image, completion: event.requiresCompletion, recurrenceFrequency: event.recurrenceFrequency))

                weeksToAdd += 7
            }
        }

        else if event.recurrenceFrequency == 3 {
            for _ in 1...2 {
                dateComponent.day = 0
                dateComponent.month = monthsToAdd
                dateComponent.year = 0

                let newDate = Calendar.current.date(byAdding: dateComponent, to: event.date)

                tempEvents.append(Event(name: event.name, date: newDate!, image: event.image, completion: event.requiresCompletion, recurrenceFrequency: event.recurrenceFrequency))

                monthsToAdd += 1
            }
        }

        else if event.recurrenceFrequency == 4 {
            for _ in 1...2 {
                dateComponent.day = 0
                dateComponent.month = 0
                dateComponent.year = yearsToAdd

                let newDate = Calendar.current.date(byAdding: dateComponent, to: event.date)

                tempEvents.append(Event(name: event.name, date: newDate!, image: event.image, completion: event.requiresCompletion, recurrenceFrequency: event.recurrenceFrequency))

                yearsToAdd += 1
            }
        }

        else if event.recurrenceFrequency == 0 {
            tempEvents.append(event)
        }
    }

    daysToAdd = 0
}

我真的不认为这是相关的，但为了安全起见，这里是用于自动删除日期早于当前日期的事件的函数:

func removeOldEvents() {
    var currentIndex = 0

    let now = Event(name: "Now", date: Date(), image: #imageLiteral(resourceName: "Logo"), completion: false, recurrenceFrequency: 0)

    for event in events {
        if event.year() < now.year() {
            events.remove(at: currentIndex)

            currentIndex -= 1
        }

        else if event.month() < now.month() {
            events.remove(at: currentIndex)

            currentIndex -= 1
        }

        else if event.day() < now.day() {
            events.remove(at: currentIndex)

            currentIndex -= 1
        }

        currentIndex += 1
    }
}

Answer 1

对 extractDates() 的修改解决了此问题。感谢您为我指明了正确的方向。

func extractDates() {
    for event in tempEvents {
        dates.append(event.date)
    }

    var currentIndex = 0

    for date in dates {
        let newDate = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: date)!
        dates[currentIndex] = newDate
        print(dates[currentIndex])
        currentIndex += 1
    }

    var tempDates = dates.removingDuplicates()
    tempDates = tempDates.sorted()
    dates = tempDates

    for date in dates {
        let calendar = Calendar.current

        let year = calendar.component(.year, from: date)
        let month = calendar.component(.month, from: date)
        let day = calendar.component(.day, from: date)

        dateComponents.append((month, day, year))
    }
}