NSDateComponents Weekday 總是從星期日開(kāi)始，也就是星期天是 1 星期一是 2 ……星期六是 7

[NSCalendar setFirstWeekday:2]，改變的是類NSCalendar的week排列順序，跟NSDateComponents的weekday沒(méi)有關(guān)系，它還是以星期天是1開(kāi)始，改變的只是NSCalendar的實(shí)例，該實(shí)例的weekday改為了周一是1開(kāi)始。

//返回周幾的問(wèn)題

- (NSString *)datestr

{

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

NSArray *weekdayAry = [NSArray arrayWithObjects:@"周日", @"周一", @"周二", @"周三", @"周四", @"周五", @"周六", nil];

[dateFormat ?setShortWeekdaySymbols:weekdayAry];

[dateFormat setDateFormat:@"yyyy年eee"];

NSDate *date = [NSDate date];

NSString *srting = [dateFormat stringFromDate:date];

return srting;

}