NSDate 一些常用方法（待补充）
/**
**判断 日期是否是本周
**/
-(BOOL)isCurrentWeek:(NSString *)dateStr{
NSDateFormatter *dateFormatter=[[NSDateFormatteralloc]init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSDate *date=[dateFormatter dateFromString:dateStr];
[dateFormatter release];
NSDate *start;
NSTimeInterval extends;
NSCalendar *cal=[NSCalendarautoupdatingCurrentCalendar];
[cal setFirstWeekday:2];//一周的第一天设置为周一
NSDate *today=[NSDatedate];
BOOL success= [calrangeOfUnit:NSWeekCalendarUnit startDate:&start interval: &extends forDate:today];
if(!success)
return NO;
NSTimeInterval dateInSecs = [date timeIntervalSinceReferenceDate];
NSTimeInterval dayStartInSecs= [starttimeIntervalSinceReferenceDate];
if(dateInSecs >= dayStartInSecs && dateInSecs < (dayStartInSecs+extends)){
return YES;
}
else {
return NO;
}
}
/***
***根据日期计算周几
****/
-(NSString *)weekDayWithDate:(NSString *)date{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];
NSDate *fromdate=[dateFormatter dateFromString:date];
NSCalendar *gregorian = [NSCalendar currentCalendar];
NSDateComponents *weekDayComponents = [gregorian components:NSWeekdayCalendarUnit fromDate:fromdate];
NSInteger mDay = [weekDayComponents weekday];
[dateFormatter release];
NSString *week=@"";
switch (mDay) {
case 0:{
week=@"日";
break;
}
case 1:{
week=@"日";
break;
}
case 2:{
week=@"一";
break;
}
case 3:{
week=@"二";
break;
}
case 4:{
week=@"三";
break;
}
case 5:{
week=@"四";
break;
}
case 6:{
week=@"五";
break;
}
case 7:{
week=@"六";
break;
}
default:{
break;
}
};
return week;
}