根据已知的日期获取星期

    

    NSArray *weekArr =
@[@"星期日",@"星期一",@"星期二",@"星期三",@"星期四",@"星期五",@"星期六"];

    NSDateComponents *dateComponent = [[NSCalendar
autoupdatingCurrentCalendar] components:NSWeekdayCalendarUnit
fromDate:[NSDate
date]];
   
NSInteger weekDay = [dateComponent
weekday];

//    日期label
   
UILabel *dateLabel = [[UILabel
alloc]initWithFrame:CGRectMake(14,
28 + 64,
150, 30)];
    dateLabel.font = [UIFont
systemFontOfSize:14];
    dateLabel.text = [NSString
stringWithFormat:@"%@%@",dateStr,weekArr[weekDay -
1]];

//    dateLabel.layer.borderWidth = 1;
    [_beforeWorkView
addSubview:dateLabel];