1、可以實現時間篩選,目測應該還有更簡單的方法。
思路: 獲取當天時間,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 =@"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(@"這個日期是上週");
}
if([self intervalSinceNow:xmlData]<7&&[self intervalSinceNow:xmlData]<[self getTodayisWeek:today])
{
NSLog(@"這個日期是本週");
}
}
- (int)intervalSinceNow: (NSDate *) theDate
{
NSTimeInterval late=[theDate timeIntervalSince1970]*1;
NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];
dat= [self getNowDateFromatAnDate:dat];
NSTimeInterval now=[dat timeIntervalSince1970]*1;
NSString *timeString=@"";
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
{
//設置源日期時區
NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"UTC"];//或GMT
//設置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偏移量
NSInteger sourceGMTOffset = [sourceTimeZone secondsFromGMTForDate:anyDate];
//目標日期與本地時區的偏移量
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:anyDate];
//得到時間偏移量的差值
NSTimeInterval interval = destinationGMTOffset - sourceGMTOffset;
//轉爲現在時間
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,週日是“1”,週一是“2”。。。。)
int factWeekDay;
//默認是週日開始
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;
}