iOS开发丨NSDate的常用方法

NSDate是项目开发中常用的类，用于时间的转换，下面将一些NSDate常用的方法集成在一个类DateConversion中，以供调用。

DateConversion.h文件如下：

#import <Foundation/Foundation.h>

@interface DateConversion : NSObject

/// 获取默认的date formatter
+ (NSDateFormatter *)getDateFormatter;
/// 将utc时间转换为默认日期格式字符串
+ (NSString *)utcToDateString:(long)utc;
/// 将utc时间转换为字符串, @"yyyy MM dd HH:mm:ss Z", 英文模式 MMM
+ (NSString *)utcToDateString:(long)utc dateFormat:(NSString *)format;
/// 将字符串转换为utc时间
+ (long)dateFormatToUTC:(NSString *)dateString dateFormat:(NSString *)format;
/// 将北京时区字符串转换为utc时间
+ (long)beijingDateStringToUTC:(NSString *)dateString dateFormat:(NSString *)format;
/// 将时间转换为新的格式
+ (NSString *)dateStringToFormatString:(NSString *)dateStr format:(NSString *)format toFormat:(NSString *)toFormat;
/// 获取每周第一天的utc
+ (long)getFirstUTCInWeekForUTC:(long)utc;
/// 获取每周最后一天的utc
+ (long)getLastUTCInWeekForUTC:(long)utc;
/// 获取当前utc是在以周日开始的一周的第几天
+ (int)getWeekDayForUTC:(long)utc;
/// 获取每月第一天的utc
+ (long)getFistDayUTCInMonthForUTC:(long)utc;
/// 获取每年第一天的utc
+ (long)getFistDayUTCInYearForUTC:(long)utc;
/// 获取本月天数
+ (int)getDaysInThisMonthWithUTC:(long)utc;
/// 获取本年天数
+ (int)getDaysInThisYearWithUTC:(long)utc;
/// 计算 utc 时间为周几
+ (NSString *)getWeekStringForUTC:(long)utc;
/// 获取月份文本
+ (NSString *)getMonthString:(NSInteger)index;
/// 获取随机整数值
+ (int)getRandomInt:(int)from to:(int)to;
/// 获取随机浮点数值
+ (float)getRandomFloat:(float)from to:(float)to;
/// 获取时间文本 xHxxMin
+ (NSString *)getTimeString:(int)time;
//// 获取时间文本 HH:MM
+ (NSString *)getHourMinuTimeString:(int)time;
/// 获取日期文本，是否显示年
+ (NSString *)dateStringWithUTC:(long)utc year:(BOOL)year;

@end

DateConversion.m文件如下：

#import "DateConversion.h"

@implementation DateConversion

/// 获取默认的date formatter
+ (NSDateFormatter *)getDateFormatter {
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
    dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]];  // 获得正确的返回日期，避免日本日历、佛教日历取date异常
    [dateFormatter setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
    return dateFormatter;
}

/// 将utc时间转换为默认日期格式字符串
+ (NSString *)utcToDateString:(long)utc {
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateStyle = NSDateFormatterMediumStyle;
    dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]];  // 获得正确的返回日期，避免日本日历、佛教日历取date异常
    [dateFormatter setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
    NSString *dateString = [dateFormatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
    return dateString;
}

/// 将utc时间转换为字符串, @"yyyy MM dd HH:mm:ss Z", 英文模式 MMM
+ (NSString *)utcToDateString:(long)utc dateFormat:(NSString *)format {
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = format;
    dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]];  // 获得正确的返回日期，避免日本日历、佛教日历取date异常
    [dateFormatter setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
    NSString *dateString = [dateFormatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
    return dateString;
}

/// 将字符串转换为utc时间
+ (long)dateFormatToUTC:(NSString *)dateString dateFormat:(NSString *)format {
    long utc = 0;
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = format;
    dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]];  // 获得正确的返回日期，避免日本日历、佛教日历取date异常
    [dateFormatter setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
    utc = [[dateFormatter dateFromString:dateString] timeIntervalSince1970];
    return utc;
}

/// 将北京时区字符串转换为手机当前utc时间
+ (long)beijingDateStringToUTC:(NSString *)dateString dateFormat:(NSString *)format {
    long utc = [self dateFormatToUTC:dateString dateFormat:format];
    NSInteger offset = [[NSTimeZone localTimeZone] secondsFromGMTForDate:[NSDate date]];  // 手机当前时区与格林威治时间的时间差
    utc = utc + offset - 8*3600;
    return utc;
}

/// 将时间转换为新的格式
+ (NSString *)dateStringToFormatString:(NSString *)dateStr format:(NSString *)format toFormat:(NSString *)toFormat {
    NSDateFormatter *curFormat = [[NSDateFormatter alloc] init];
    curFormat.dateFormat = format;
    // 获得正确的返回日期，避免日本日历、佛教日历取date异常的问题
    NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]];
    [curFormat setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
    [curFormat setLocale:locale];
    
    NSDateFormatter *newFormat = [[NSDateFormatter alloc] init];
    newFormat.dateFormat = toFormat;
    [newFormat setCalendar:[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian]];
    [newFormat setLocale:locale];
    
    NSString *formatString = [newFormat stringFromDate:[curFormat dateFromString:dateStr]];
    return formatString;
}

/// 获取每周第一天的utc
+ (long)getFirstUTCInWeekForUTC:(long)utc {
    NSDateComponents *comp = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitYear|NSCalendarUnitMonth|kCFCalendarUnitDay|kCFCalendarUnitWeekday
                                                             fromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
    comp.calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
    /// 1(星期天) 2(星期一) 3(星期二) 4(星期三) 5(星期四) 6(星期五) 7(星期六)
    int week[7] = {1, 2, 3, 4, 5, 6, 7};
    int current_wd = week[[comp weekday] - 1];  /// 当前星期
    long first_utc = utc - (current_wd - 1) * 24 * 3600;
    return first_utc;
}

/// 获取每周最后一天的utc
+ (long)getLastUTCInWeekForUTC:(long)utc {
    NSDateComponents *comp = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitYear|NSCalendarUnitMonth|kCFCalendarUnitDay|kCFCalendarUnitWeekday
                                                             fromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
    comp.calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
    /// 1(星期天) 2(星期一) 3(星期二) 4(星期三) 5(星期四) 6(星期五) 7(星期六)
    int week[7] = {1, 2, 3, 4, 5, 6, 7};
    int current_wd = week[[comp weekday] - 1];  /// 当前星期
    long last_utc = utc - (current_wd - 7) * 24 * 3600;
    return last_utc;
}

/// 获取当前utc是在以周日开始的一周的第几天
+ (int)getWeekDayForUTC:(long)utc {
    NSDateComponents *comp = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitYear|NSCalendarUnitMonth|kCFCalendarUnitDay|kCFCalendarUnitWeekday
                                                             fromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
    comp.calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
    return (int)[comp weekday];
}

/// 获取每月第一天的utc
+ (long)getFistDayUTCInMonthForUTC:(long)utc {
    NSString *year = [DateConversion utcToDateString:utc dateFormat:@"yyyy MM"];
    NSString *firstday = [NSString stringWithFormat:@"%@ 01", year];
    return [DateConversion dateFormatToUTC:firstday dateFormat:@"yyyy MM dd"];
}

/// 获取每年第一天的utc
+ (long)getFistDayUTCInYearForUTC:(long)utc {
    NSString *year = [DateConversion utcToDateString:utc dateFormat:@"yyyy"];
    NSString *firstday = [NSString stringWithFormat:@"%@ 01 01", year];
    return [DateConversion dateFormatToUTC:firstday dateFormat:@"yyyy MM dd"];
}

/// 获取本月天数
+ (int)getDaysInThisMonthWithUTC:(long)utc {
    NSRange daysInLastMonth = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] rangeOfUnit:NSCalendarUnitDay
                                                                 inUnit:NSCalendarUnitMonth
                                                                forDate:[NSDate dateWithTimeIntervalSince1970:utc]];
    return (int)daysInLastMonth.length;
}

/// 获取本年天数
+ (int)getDaysInThisYearWithUTC:(long)utc {
    int year = [[self utcToDateString:utc dateFormat:@"yyyy"] intValue];
    int days = 365;
    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
        days = 366; /// 闰年366天
    }
    return days;
}

/// 计算 utc 时间为周几
+ (NSString *)getWeekStringForUTC:(long)utc {
    int day = [DateConversion getWeekDayForUTC:utc] - 1;
    NSArray *weekArr = @[NSLocalizedString(@"calendar_sun", nil),
                         NSLocalizedString(@"calendar_mon", nil),
                         NSLocalizedString(@"calendar_tue", nil),
                         NSLocalizedString(@"calendar_wed", nil),
                         NSLocalizedString(@"calendar_thu", nil),
                         NSLocalizedString(@"calendar_fri", nil),
                         NSLocalizedString(@"calendar_sat", nil),];
    return weekArr[day];
}

/// 获取月份文本
+ (NSString *)getMonthString:(NSInteger)index {
    NSArray *monthArr = @[NSLocalizedString(@"January", nil),
                          NSLocalizedString(@"February", nil),
                          NSLocalizedString(@"March", nil),
                          NSLocalizedString(@"April", nil),
                          NSLocalizedString(@"May", nil),
                          NSLocalizedString(@"June", nil),
                          NSLocalizedString(@"July", nil),
                          NSLocalizedString(@"August", nil),
                          NSLocalizedString(@"September", nil),
                          NSLocalizedString(@"October", nil),
                          NSLocalizedString(@"November", nil),
                          NSLocalizedString(@"December", nil)];
    return monthArr[index - 1];
}

/// 获取随机整数值
+ (int)getRandomInt:(int)from to:(int)to {
    return (int)(from + (arc4random() % (to - from + 1)));
}

/// 获取随机浮点数值
+ (float)getRandomFloat:(float)from to:(float)to {
    float diff = to - from;
    return (((float) arc4random() / UINT_MAX) * diff) + from;
}

//// 获取时间文本 xHxxMin
+ (NSString *)getTimeString:(int)time {
    int hour = time / 60;
    int minu = time - hour*60;
    if (hour != 0 && minu < 0) {
        minu = abs(minu);
    }
    NSString *str_1 = hour == 0 ? @"" : [NSString stringWithFormat:@"%d", hour];
    NSString *str_2 = hour == 0 ? @"" : [NSString stringWithFormat:@"%@", NSLocalizedString(@"sleep_hour", nil)];
    NSString *str_3 = [NSString stringWithFormat:@"%d", minu];
    NSString *str_4 = [NSString stringWithFormat:@"%@", NSLocalizedString(@"sleep_min", nil)];
    if (minu == 0) {
        str_3 = @"";
        str_4 = @"";
    }
    return [NSString stringWithFormat:@"%@%@%@%@", str_1, str_2, str_3, str_4];
}

//// 获取时间文本 HH:MM
+ (NSString *)getHourMinuTimeString:(int)time {
    if (time == 0) {
        return [NSString stringWithFormat:@"--:--"];
    }
    int hour = time / 60;
    int minu = time - hour*60;
    if (hour != 0 && minu < 0) {
        minu = abs(minu);
    }
    return [NSString stringWithFormat:@"%02d:%02d", hour, minu];
}

/// 获取日期文本，是否显示年
+ (NSString *)dateStringWithUTC:(long)utc year:(BOOL)year {
    NSDateComponents *comp = [[NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian] components:NSCalendarUnitYear|NSCalendarUnitMonth|kCFCalendarUnitDay|kCFCalendarUnitHour|kCFCalendarUnitMinute|kCFCalendarUnitSecond|kCFCalendarUnitWeekday
                                                             fromDate:[NSDate dateWithTimeIntervalSince1970:utc]];
    comp.calendar = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
    NSString *dateString = @"";
    if ([APPModelManager isChinaCalendar]) {
        if (year) {
            dateString = [NSString stringWithFormat:@"%@%@%@",
                          [NSString stringWithFormat:@"%zi%@", comp.year, NSLocalizedString(@"report_year", nil)],
                          [NSString stringWithFormat:@"%zi%@", comp.month, NSLocalizedString(@"report_month", nil)],
                          [NSString stringWithFormat:@"%zi%@", comp.day, NSLocalizedString(@"report_day", nil)]];
        }
        else {
            dateString = [NSString stringWithFormat:@"%@%@",
                          [NSString stringWithFormat:@"%zi%@", comp.month, NSLocalizedString(@"report_month", nil)],
                          [NSString stringWithFormat:@"%zi%@", comp.day, NSLocalizedString(@"report_day", nil)]];
        }
    }
    else {
        if (year) {
            NSString *yeaStr = [NSString stringWithFormat:@"%zi", comp.year];
            NSString *monStr = [DateConversion getMonthString:comp.month];
            NSString *dayStr = [NSString stringWithFormat:@"%zi", comp.day];
            dateString = [NSString stringWithFormat:@"%@ %@, %@", monStr, dayStr, yeaStr];
        }
        else {
            NSString *monStr = [DateConversion getMonthString:comp.month];
            NSString *dayStr = [NSString stringWithFormat:@"%zi", comp.day];
            dateString = [NSString stringWithFormat:@"%@ %@", monStr, dayStr];
        }
    }
    return dateString;
}

@end

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iOS开发丨NSDate的常用方法

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