iOS根据日期获得相应的星期

-(NSString *)weekStringFromDate:(NSDate *)date{

    

    NSArray *weeks=@[[NSNull null],@"Sunday",@"Monday",@"Tuesday",@"Wednesday",@"Thursday",@"Friday",@"Saturday"];

    NSCalendar *calendar=[[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar];

    NSTimeZone *timeZone=[[NSTimeZone alloc]initWithName:@"Asia/Beijing"];

    [calendar setTimeZone:timeZone];

    NSCalendarUnit calendarUnit=NSWeekdayCalendarUnit;

    NSDateComponents *components=[calendar components:calendarUnit fromDate:date];

    return [weeks objectAtIndex:components.weekday];

}

我们需要获得相应的日期时间date然后从而获得对应的星期

 NSString *currentWeekTime=[_directModel.update_time substringWithRange:weekRang];

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

    [dateFormatter setDateFormat: @"yyyy-MM-dd"];

    NSDate *destDate= [dateFormatter dateFromString:currentWeekTime];

    NSString *weekString=[self weekStringFromDate:destDate];