[iOS]時間篩選之<本周、上周、更早>

標籤：時間篩選

1、可以實現時間篩選，目測應該還有更簡單的方法。

思路： 擷取當天時間，和目標時間進行比對操作。

注意點：時區 時區 時區 重要的時區說三遍。

- (void)viewDidLoad {    [super viewDidLoad];    NSDate * today = [NSDate date];        //定義當前時區時間    NSString * time [email protected]"2015-08-16 00:00:00";    NSDate* xmlData = [self dateFromString:time];        xmlData = [self getNowDateFromatAnDate:xmlData];        if([self intervalSinceNow:xmlData]>=[self getTodayisWeek:today]+7)    {        NSLog(@"這個日期是很早以前");    }    if([self intervalSinceNow:xmlData]>=[self getTodayisWeek:today]&&[self intervalSinceNow:xmlData]<[self getTodayisWeek:today]+7)    {        NSLog(@"這個日期是上周");    }    if([self intervalSinceNow:xmlData]<7&&[self intervalSinceNow:xmlData]<[self getTodayisWeek:today])    {        NSLog(@"這個日期是本周");    }        }- (int)intervalSinceNow: (NSDate *) theDate{    NSTimeInterval late=[theDate timeIntervalSince1970]*1;        NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];    dat=  [self getNowDateFromatAnDate:dat];    NSTimeInterval now=[dat timeIntervalSince1970]*1;    NSString *[email protected]"";        NSTimeInterval cha=now-late;        if (cha/86400>1)    {        timeString = [NSString stringWithFormat:@"%f", cha/86400];        timeString = [timeString substringToIndex:timeString.length-7];        return [timeString intValue];    }    return -1;   }- (NSDate *)getNowDateFromatAnDate:(NSDate *)anyDate{    //設定源日期時區    NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];//或GMT    //設定轉換後的目標日期時區    NSTimeZone* destinationTimeZone = [NSTimeZone localTimeZone];    //得到源日期與世界標準時間的位移量    NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:anyDate];    //目標日期與本地時區的位移量    NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:anyDate];    //得到時間位移量的差值    NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;    //轉為現在時間    NSDate* destinationDateNow = [[NSDate alloc] initWithTimeInterval:interval sinceDate:anyDate];    return destinationDateNow;}- (NSDate *)dateFromString:(NSString *)dateString{        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];        [dateFormatter setDateFormat: @"yyyy-MM-dd HH:mm:ss"];         NSDate *destDate= [dateFormatter dateFromString:dateString];         return destDate;    }//獲得某日是周幾-(int)getTodayisWeek:(NSDate *)today{    today = [self getNowDateFromatAnDate:today];    NSCalendar*calendar = [NSCalendar currentCalendar];    NSDateComponents*comps;    [comps setWeekday:0];    comps =[calendar components:(NSCalendarUnitWeekday)fromDate:today];    NSInteger weekday = [comps weekday]; // 星期幾（注意，周日是“1”，周一是“2”。。。。）    int  factWeekDay;    //預設是周日開始    switch (weekday) {        case 1:            factWeekDay = 7  ;            break;        case 2:            factWeekDay = 1  ;            break;        case 3:            factWeekDay = 2  ;            break;        case 4:            factWeekDay = 3  ;            break;        case 5:            factWeekDay = 4  ;            break;        case 6:            factWeekDay = 5  ;            break;        case 7:            factWeekDay = 6  ;            break;        default:            break;    }        return  factWeekDay;}

著作權聲明：本文為博主原創文章，未經博主允許不得轉載。

[iOS]時間篩選之<本周、上周、更早>