一、介绍
在开发中，日期的使用绝对是离不了的，跟业务的关联性太强了，例如课程表。有的时候我们不需要课程表，但是需要获取一周7天的日期，这一周内的日期，我觉得有两种理解：
1、获取当天开始的一周日期，当天作为起点往后顺延的一周（红色的为当天），实现方法见如下代码：方式一：
2、获取一周内的日期，当天在这一周内，所在一周的第一天和最后一天, 不是作为起点往后顺延（红色的为当天），实现方法见如下代码：方式二：
二、代码（放在单例工具类HYWeekCalendarUitility实现）
1、工具类声明和实现
@interface HYWeekCalendarUitility : NSObject
@property (nonatomic, strong) NSArray *weeks;
@property (nonatomic, copy) NSString *firstDayDeteOfWeek;
@property (nonatomic, copy) NSString *nowDayDeteOfWeek;
@property (nonatomic, copy) NSString *lastDayDeteOfWeek;
+ (instancetype)shareInstance;
@end
+ (instancetype)shareInstance {
static HYWeekCalendarUitility *weekCalendarUitility = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
weekCalendarUitility = [[HYWeekCalendarUitility alloc] init];
//[weekCalendarUitility getDateWeeksDuraingToday];
[weekCalendarUitility getDateWeeksFromToday];
});
return weekCalendarUitility;
}-(NSString *)transWeekName:(NSString *)orrignWeekName
{
NSString *targetWeekName = @""; //转换文案
if ([orrignWeekName isEqualToString:@"星期日"]) {
targetWeekName = @"周日";
}
else if ([orrignWeekName isEqualToString:@"星期一"]) {
targetWeekName = @"周一";
}
else if ([orrignWeekName isEqualToString:@"星期二"]) {
targetWeekName = @"周二";
}
else if ([orrignWeekName isEqualToString:@"星期三"]) {
targetWeekName = @"周三";
}
else if ([orrignWeekName isEqualToString:@"星期四"]) {
targetWeekName = @"周四";
}
else if ([orrignWeekName isEqualToString:@"星期五"]) {
targetWeekName = @"周五";
}else{
targetWeekName = @"周六";
} return targetWeekName;
}
2、方法实现
---方式一---
/**
* 模式一
* 获取当前时间开始的一周日期
* 注意：当天作为起点往后顺延的一周
*/
-(void)getDateWeeksFromToday{ //日历格式
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateFormatter *formater = [[NSDateFormatter alloc] init];
[formater setDateFormat:@"yyyy-MM-dd"]; NSMutableArray *dateWeeks = [NSMutableArray array];
for (int i=; i<; i++) {
//这一天
NSDateComponents *components = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekday fromDate:[NSDate dateWithTimeIntervalSinceNow: * * * i]];
NSDate *date = [calendar dateFromComponents:components]; //年月日
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSString *dateString = [dateFormatter stringFromDate:date];//几月几号 //星期
NSDateFormatter *weekFormatter = [[NSDateFormatter alloc] init];
[weekFormatter setDateFormat:@"EEEE"];
NSString *weekString = [self transWeekName:[weekFormatter stringFromDate:date]];//周几 NSString *date_weekStr = [NSString stringWithFormat:@"%@-%@",dateString,weekString];
[dateWeeks addObject:date_weekStr]; //赋值
if (i==) {
self.firstDayDeteOfWeek = [formater stringFromDate:date];
self.nowDayDeteOfWeek = [formater stringFromDate:date];
}else if (i==) {
self.lastDayDeteOfWeek = [formater stringFromDate:date];
}
} self.weeks = dateWeeks;
NSLog(@"----dateWeeks:%@------",dateWeeks);
}
---方式二---
/**
* 模式二
* 获取当前时间所在一周的第一天和最后一天, 也即一周的日期
* 注意：当天在这一周内，不是作为起点往后顺延
*/
- (void)getDateWeeksDuraingToday
{
//日历格式
NSDate *now = [NSDate date];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *comp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday
fromDate:now];
// 得到：今天是星期几
// 1(星期天) 2(星期二) 3(星期三) 4(星期四) 5(星期五) 6(星期六) 7(星期天)
NSInteger weekDay = [comp weekday];
// 得到：今天是几号
NSInteger day = [comp day]; NSLog(@"weekDay:%ld day:%ld",weekDay,day); // 计算当前日期和这周的星期一和星期天差的天数
long firstDiff,lastDiff;
if (weekDay == ) {
firstDiff = ;
lastDiff = ;
}else{
firstDiff = [calendar firstWeekday] - weekDay;
lastDiff = - weekDay;
}
NSLog(@"firstDiff:%ld lastDiff:%ld",firstDiff,lastDiff); // 一周日期
NSArray *dateWeeks = [self getCurrentWeeksWithFirstDiff:firstDiff lastDiff:lastDiff]; // 在当前日期(去掉了时分秒)基础上加上差的天数
NSDateComponents *firstDayComp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
[firstDayComp setDay:day + firstDiff];
NSDate *firstDayOfWeek= [calendar dateFromComponents:firstDayComp]; NSDateComponents *lastDayComp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
[lastDayComp setDay:day + lastDiff];
NSDate *lastDayOfWeek= [calendar dateFromComponents:lastDayComp]; NSDateFormatter *formater = [[NSDateFormatter alloc] init];
[formater setDateFormat:@"yyyy-MM-dd"];
NSLog(@"一周开始 %@",[formater stringFromDate:firstDayOfWeek]);
NSLog(@"当前 %@",[formater stringFromDate:now]);
NSLog(@"一周结束 %@",[formater stringFromDate:lastDayOfWeek]); NSLog(@"%@",dateWeeks); self.firstDayDeteOfWeek = [formater stringFromDate:firstDayOfWeek];
self.nowDayDeteOfWeek = [formater stringFromDate:now];
self.lastDayDeteOfWeek = [formater stringFromDate:lastDayOfWeek];
self.weeks = dateWeeks;
} //获取一周时间 数组
- (NSMutableArray *)getCurrentWeeksWithFirstDiff:(NSInteger)first lastDiff:(NSInteger)last{ NSMutableArray *eightArr = [[NSMutableArray alloc] init];
for (NSInteger i = first; i < last + ; i ++) {
//从现在开始的24小时
NSTimeInterval secondsPerDay = i * **;
NSDate *curDate = [NSDate dateWithTimeIntervalSinceNow:secondsPerDay]; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSString *dateStr = [dateFormatter stringFromDate:curDate];//几月几号
//NSString *dateStr = @"5月31日";
NSDateFormatter *weekFormatter = [[NSDateFormatter alloc] init];
[weekFormatter setDateFormat:@"EEEE"];//星期几 @"HH:mm 'on' EEEE MMMM d"];
NSString *weekStr = [weekFormatter stringFromDate:curDate]; //转换文案
weekStr = [self transWeekName:weekStr]; //组合时间
NSString *strTime = [NSString stringWithFormat:@"%@-%@",dateStr,weekStr];
[eightArr addObject:strTime]; }
return eightArr;
}