iOS Swift之時間段抓取

在家手癢就給自己找了點(diǎn)事做做，下面是關(guān)于怎么獲取某個時間點(diǎn)對應(yīng)時間段的一些方法，包含本周（上周，下周）開始結(jié)束日期，本月（上月，下月）開始結(jié)束日期，本年（上年，下年）開始結(jié)束日期的獲取方法。內(nèi)容以后會持續(xù)更新：
（封裝在一個自定義的類中（DateEncapsulation））
指定日期的當(dāng)前周，上周，下周 的時間段

// MARK: - week
static func getThisWeek(_ date: Date) -> (firstDate: String, lastDate: String)? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        
        let calendar = Calendar.current
        let comp = calendar.dateComponents([.year, .month, .day, .weekday], from: date)
        
        // 獲取今天是周幾, 今天是幾號
        if let weekDay = comp.weekday, let day = comp.day {
            
            // 計(jì)算當(dāng)前日期和本周的星期一和星期天相差天數(shù)
            var firstDiff: Int
            var lastDiff: Int
            // weekDay = 1;
            if (weekDay == 1) {
                firstDiff = -6;
                lastDiff = 0;
            } else {
                firstDiff = calendar.firstWeekday - weekDay + 1
                lastDiff = 8 - weekDay
            }
            
            // 在當(dāng)前日期(去掉時分秒)基礎(chǔ)上加上差的天數(shù)
            var firstDayComp = calendar.dateComponents([.year, .month, .day], from: date)
            firstDayComp.day = day + firstDiff
            var lastDayComp = calendar.dateComponents([.year, .month, .day], from: date)
            lastDayComp.day = day + lastDiff
            
            if let firstDayOfWeek = calendar.date(from: firstDayComp), let lastDayOfWeek = calendar.date(from: lastDayComp) {
                
                let firstDay = dateFormatter.string(from: firstDayOfWeek)
                let lastDay = dateFormatter.string(from: lastDayOfWeek)
                
                return (firstDate: firstDay, lastDate: lastDay)
            }
        }
       return nil
    }

 static func getLastWeek(_ date: Date) -> (firstDate: String, lastDate: String)? {
        let dateFormatter = DateFormatter()
         dateFormatter.dateFormat = "yyyy-MM-dd"
        
         let calendar = Calendar.current
         let comp = calendar.dateComponents([.year, .month, .day, .weekday], from: date)
         
         // 獲取今天是周幾, 今天是幾號
         if let weekDay = comp.weekday, let day = comp.day {
             
             // 計(jì)算當(dāng)前日期和本周的星期一和星期天相差天數(shù)
             var firstDiff: Int
             var lastDiff: Int
             // weekDay = 1;
             if (weekDay == 1) {
                 firstDiff = -6;
                 lastDiff = 0;
             } else {
                 firstDiff = calendar.firstWeekday - weekDay + 1
                 lastDiff = 8 - weekDay
             }

            // 上周，減七天
            firstDiff -= 7
            lastDiff -= 7
             
             // 在當(dāng)前日期(去掉時分秒)基礎(chǔ)上加上差的天數(shù)
             var firstDayComp = calendar.dateComponents([.year, .month, .day], from: date)
             firstDayComp.day = day + firstDiff
             var lastDayComp = calendar.dateComponents([.year, .month, .day], from: date)
             lastDayComp.day = day + lastDiff
             
             if let firstDayOfWeek = calendar.date(from: firstDayComp), let lastDayOfWeek = calendar.date(from: lastDayComp) {
                 
                 let firstDay = dateFormatter.string(from: firstDayOfWeek)
                 let lastDay = dateFormatter.string(from: lastDayOfWeek)
                 
                 return (firstDate: firstDay, lastDate: lastDay)
             }
         }
         
        return nil
    }
    
    static func getNextWeek(_ date: Date) -> (firstDate: String, lastDate: String)? {
        let dateFormatter = DateFormatter()
         dateFormatter.dateFormat = "yyyy-MM-dd"
        
         let calendar = Calendar.current
         let comp = calendar.dateComponents([.year, .month, .day, .weekday], from: date)
         
         // 獲取今天是周幾, 今天是幾號
         if let weekDay = comp.weekday, let day = comp.day {
             
             // 計(jì)算當(dāng)前日期和本周的星期一和星期天相差天數(shù)
             var firstDiff: Int
             var lastDiff: Int
             // weekDay = 1;
             if (weekDay == 1) {
                 firstDiff = -6;
                 lastDiff = 0;
             } else {
                 firstDiff = calendar.firstWeekday - weekDay + 1
                 lastDiff = 8 - weekDay
             }

            // 下周，加七天
            firstDiff += 7
            lastDiff += 7
             
             // 在當(dāng)前日期(去掉時分秒)基礎(chǔ)上加上差的天數(shù)
             var firstDayComp = calendar.dateComponents([.year, .month, .day], from: date)
             firstDayComp.day = day + firstDiff
             var lastDayComp = calendar.dateComponents([.year, .month, .day], from: date)
             lastDayComp.day = day + lastDiff
             
             if let firstDayOfWeek = calendar.date(from: firstDayComp), let lastDayOfWeek = calendar.date(from: lastDayComp) {
                 
                 let firstDay = dateFormatter.string(from: firstDayOfWeek)
                 let lastDay = dateFormatter.string(from: lastDayOfWeek)
                 
                 return (firstDate: firstDay, lastDate: lastDay)
             }
         }
        return nil
    }

指定日期的當(dāng)前月，上月，下月 的時間段

// MARK: - month
static func getThisMonth(_ date: Date) -> (firstDate: String, lastDate: String)? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        
        let calendar = Calendar.current
        let currentComponents = calendar.dateComponents([.year, .month], from: date)
        
        if let startDate = calendar.date(from: currentComponents) {
            // 當(dāng)月第一天
            let startDayString = dateFormatter.string(from: startDate)
            
            var diffComponents = DateComponents()
            // 比當(dāng)月一日多一個月少一天即為當(dāng)月最后一日
            diffComponents.month = 1
            diffComponents.day = -1
            if let endDate = calendar.date(byAdding: diffComponents, to: startDate) {
                let endDayString = dateFormatter.string(from: endDate)
                return (firstDate: startDayString, lastDate: endDayString)
            }
        }
        
        return nil
    }
    
    static func getLastMonth(_ date: Date) -> (firstDate: String, lastDate: String)? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        
        // 當(dāng)前傳入日期 轉(zhuǎn)成 Date 格式
        let calendar = Calendar.current
        var currentComponents = calendar.dateComponents([.year, .month, .day], from: date)
        
        // 設(shè)置為 1，轉(zhuǎn)成 Date 后為當(dāng)前傳入日期月份的第一天
        currentComponents.day = 1
        
        if let startOfMonth = calendar.date(from: currentComponents) {
            
            var diffComponents = DateComponents()
            // 比當(dāng)前月一日少一個月即為上月一日
            diffComponents.month = -1
            
            // 當(dāng)月第一天
            if let startDate = calendar.date(byAdding: diffComponents, to: startOfMonth) {
                let startDayString = dateFormatter.string(from: startDate)
                
                // 比當(dāng)前月少一天即為上月最后一日
                diffComponents.month = 0
                diffComponents.day = -1
                if let endDate = calendar.date(byAdding: diffComponents, to: startOfMonth) {
                    let endDayString = dateFormatter.string(from: endDate)
                    return (firstDate: startDayString, lastDate: endDayString)
                }
            }
        }
        return nil
    }
    
    static func getNextMonth(_ date: Date) -> (firstDate: String, lastDate: String)? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        
        let calendar = Calendar.current
        
        // 當(dāng)前傳入日期 轉(zhuǎn)成 DateComponents 格式
        var currentComponents = calendar.dateComponents([.year, .month, .day], from: date)
        
        // 設(shè)置為 1，轉(zhuǎn)成 Date 后為當(dāng)前傳入日期月份的第一天
        currentComponents.day = 1
        
        if let startOfMonth = calendar.date(from: currentComponents) {
                        
            // 處理時間差
            var diffComponents = DateComponents()
            // 添加一個月的時間差
            diffComponents.month = 1
            
            // 下個月第一天
            if let startDate = calendar.date(byAdding: diffComponents, to: startOfMonth) {
                let startDayString = dateFormatter.string(from: startDate)
                
                // 和當(dāng)前月第一天相差兩個月少一天即為下個月最后一天時間
                diffComponents.month = 2
                diffComponents.day = -1
                if let endDate = calendar.date(byAdding: diffComponents, to: startOfMonth) {
                    let endDayString = dateFormatter.string(from: endDate)
                    return (firstDate: startDayString, lastDate: endDayString)
                }
            }
        }
        return nil
    }

指定日期的當(dāng)前年，上一年，下一年 的時間段

 // MARK: - year
    static func getThisYear(_ date: Date) -> (firstDate: String, lastDate: String)? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        
        let calendar = Calendar.current
        let currentComponents = calendar.dateComponents([.year], from: date)
        if let startDate = calendar.date(from: currentComponents) {
            // 當(dāng)年第一天
            let startDayString = dateFormatter.string(from: startDate)
            
            var diffComponents = DateComponents()
            // 比當(dāng)年一月一號多一年少一天即為當(dāng)年最后一日
            diffComponents.year = 1
            diffComponents.day = -1
            if let endDate = calendar.date(byAdding: diffComponents, to: startDate) {
                let endDayString = dateFormatter.string(from: endDate)
                return (firstDate: startDayString, lastDate: endDayString)
            }
        }
        return nil
    }

    static func getLastYear(_ date: Date) -> (firstDate: String, lastDate: String)? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        
        let calendar = Calendar.current
        let currentComponents = calendar.dateComponents([.year], from: date)
        if let startDate = calendar.date(from: currentComponents) {
            // 當(dāng)年第一天
            // let startOfday = dateFormatter.string(from: startOfMonth)
            
            var diffComponents = DateComponents()
            
            diffComponents.year = -1
            if let startOfLastYear = calendar.date(byAdding: diffComponents, to: startDate) {
                let startDayString = dateFormatter.string(from: startOfLastYear)
                
                // 比當(dāng)年一月一號多一年少一天即為當(dāng)年最后一日
                diffComponents.year = 0
                diffComponents.day = -1
                if let endDate = calendar.date(byAdding: diffComponents, to: startDate) {
                    let endDayString = dateFormatter.string(from: endDate)
                    return (firstDate: startDayString, lastDate: endDayString)
                }
                
            }
            
        }
        return nil
    }

    static func getNextYear(_ date: Date) -> (firstDate: String, lastDate: String)? {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd"
        
        let calendar = Calendar.current
        let currentComponents = calendar.dateComponents([.year], from: date)
        if let startOfMonth = calendar.date(from: currentComponents) {
            // 當(dāng)年第一天
            // let startOfday = dateFormatter.string(from: startOfMonth)
            
            var diffComponents = DateComponents()
            
            diffComponents.year = 1
            if let startDate = calendar.date(byAdding: diffComponents, to: startOfMonth) {
                let startDayString = dateFormatter.string(from: startDate)
                
                // 比當(dāng)年一月一號多一年少一天即為當(dāng)年最后一日
                diffComponents.year = 2
                diffComponents.day = -1
                if let endDate = calendar.date(byAdding: diffComponents, to: startOfMonth) {
                    let endDayString = dateFormatter.string(from: endDate)
                    return (firstDate: startDayString, lastDate: endDayString)
                }
                
            }
            
        }
        return nil
    }

為了方便獲取，又做了一些集中處理，加了兩個枚舉類型

// 周/月/年
    enum CalendarFormMode {
        case week
        case month
        case year
    }

    // 上周/月/年， 本周/月/年， 下周/月/年
    enum CalendarSequence {
        case this(CalendarFormMode)
        case last(CalendarFormMode)
        case next(CalendarFormMode)
    }

// 通過輸入 enum 獲取 對應(yīng)時間的 時間段
    class func dateSpanFromDate(_ date: Date, mode: DateEncapsulation.CalendarSequence) -> (firstDate: String, lastDate: String)? {
        switch mode {
        case .this(.week):
            return DateEncapsulation.getThisWeek(date)
        case .this(.month):
            return DateEncapsulation.getThisMonth(date)
        case .this(.year):
            return DateEncapsulation.getThisYear(date)
        case .last(.week):
            return DateEncapsulation.getLastWeek(date)
        case .last(.month):
            return DateEncapsulation.getLastMonth(date)
        case .last(.year):
            return DateEncapsulation.getLastYear(date)
        case .next(.week):
            return DateEncapsulation.getNextWeek(date)
        case .next(.month):
            return DateEncapsulation.getNextMonth(date)
        case .next(.year):
            return DateEncapsulation.getNextYear(date)
        }
    }

exp:

DateEncapsulation.dateSpanFromDate(Date(), mode: .this(.week))
?著作權(quán)歸作者所有,轉(zhuǎn)載或內(nèi)容合作請聯(lián)系作者
【社區(qū)內(nèi)容提示】社區(qū)部分內(nèi)容疑似由AI輔助生成，瀏覽時請結(jié)合常識與多方信息審慎甄別。
平臺聲明：文章內(nèi)容（如有圖片或視頻亦包括在內(nèi)）由作者上傳并發(fā)布，文章內(nèi)容僅代表作者本人觀點(diǎn)，簡書系信息發(fā)布平臺，僅提供信息存儲服務(wù)。

相關(guān)閱讀更多精彩內(nèi)容

  • 《鎖城》優(yōu)孕于才誕秋挲，科索連城雪百漠。通勤達(dá)謀韜五略，訊據(jù)爾塔權(quán)六聞。雎玉棠，門側(cè)影，志士山前席如縷，爾殘臥，希...
    墨上僧閱讀 386評論 0贊 0
  • 當(dāng)我談跑步時，我在談些什么。作者村上春樹以其跑步、寫作時的點(diǎn)點(diǎn)滴滴、隨時感想感受以及態(tài)度進(jìn)行了記錄總結(jié)，堅(jiān)...
    沁心雅苑閱讀 1,448評論 0贊 2

友情鏈接更多精彩內(nèi)容