如何获取周一和周六，我教你

1. -(void)test{
   
2.    
   
3.    
   
4.     NSDate *now = [NSDate date];
   
5.     NSCalendar *calendar = [NSCalendar currentCalendar];
   
6.     NSDateComponents *comp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday|NSCalendarUnitDay
   
7.                                          fromDate:now];
   
8.    
   
9.     // 得到星期几
   
10.     // 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)
    
11.     NSInteger weekDay = [comp weekday];
    
12.     // 得到几号
    
13.     NSInteger day = [comp day];
    
14.    
    
15.     NSLog(@"weekDay:%ld   day:%ld",weekDay,day);
    
16.    
    
17.     // 计算当前日期和这周的星期一和星期天差的天数
    
18.     long firstDiff,lastDiff;
    
19.     if (weekDay == 1) {
    
20.         firstDiff = 1;
    
21.         lastDiff = 0;
    
22.     }else{
    
23.         firstDiff = [calendar firstWeekday] - weekDay;
    
24.         lastDiff = 9 - weekDay;
    
25.     }
    
26.    
    
27.     NSLog(@"firstDiff:%ld   lastDiff:%ld",firstDiff,lastDiff);
    
28.    
    
29.     // 在当前日期(去掉了时分秒)基础上加上差的天数
    
30.     NSDateComponents *firstDayComp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
    
31.     [firstDayComp setDay:day + firstDiff];
    
32.     NSDate *firstDayOfWeek= [calendar dateFromComponents:firstDayComp];
    
33.    
    
34.     NSDateComponents *lastDayComp = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:now];
    
35.     [lastDayComp setDay:day + lastDiff];
    
36.     NSDate *lastDayOfWeek= [calendar dateFromComponents:lastDayComp];
    
37.    
    
38.     NSDateFormatter *formater = [[NSDateFormatter alloc] init];
    
39.     [formater setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    
40.     NSLog(@"星期一开始 %@",[formater stringFromDate:firstDayOfWeek]);
    
41.     NSLog(@"当前 %@",[formater stringFromDate:now]);
    
42.     NSLog(@"星期天结束 %@",[formater stringFromDate:lastDayOfWeek]);
    
43. }

复制代码