DaffodilGirl 于 2012.11.30 13:30 提问

2个回答

DaffodilGirl   2012.11.30 16:53

``````    -(void)findWeekDay:(NSInteger)weekDay forWeek:(NSInteger)week OfMonth:(NSInteger)month OfYear:(NSInteger)year
{
NSDateComponents *dateComp = [[NSDateComponents alloc]init];
[dateComp setYear:year];
[dateComp setMonth:month];
[dateComp setDay:1];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *firstDate=[gregorian dateFromComponents:dateComp];  //Sets first date of month.
firstDate=[self dateToGMT:firstDate];
NSLog(@"First date: %@",firstDate);
NSDateComponents *dateComp1 = [gregorian components:NSDayCalendarUnit|NSWeekdayCalendarUnit fromDate:firstDate];
NSInteger firstWeekDay=[dateComp1 weekday];  //Gets firstday of a week. 1-Sunday, 2-Monday and so on.
NSLog(@"First Week Day: %d",firstWeekDay);
NSRange daysInMonth = [gregorian rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:firstDate];   //To get number of days in that month
NSInteger x;    //days to be added to first date
if (firstWeekDay < weekDay) {
x = (weekDay - firstWeekDay) + (7 * (week-1));
}
if (firstWeekDay > weekDay) {
x = (7 - firstWeekDay + weekDay) + (7 * (week-1));
}
if (firstWeekDay == weekDay) {
x = (7 * (week-1));
}
if (x > daysInMonth.length) {
NSLog(@"Invalid Date: %d",x);
}
else {
NSDateComponents *dateComp2 = [[NSDateComponents alloc]init];
[dateComp2 setYear:0];
[dateComp2 setMonth:0];
[dateComp2 setDay:x];
NSDate *desiredDate = [gregorian dateByAddingComponents:dateComp2 toDate:firstDate options:0];
}
}

- (NSDate *)dateToGMT:(NSDate *)sourceDate {
NSTimeZone* destinationTimeZone = [NSTimeZone systemTimeZone];
NSInteger destinationGMTOffset = [destinationTimeZone secondsFromGMTForDate:sourceDate];
NSDate* destinationDate = [[NSDate alloc] initWithTimeInterval:destinationGMTOffset sinceDate:sourceDate];
return destinationDate;
}
``````

``````  [self findWeekDay:2 forWeek:3 OfMonth:12 OfYear:2012];
``````
Chengzi_963   2012.11.30 14:36
``````// 设置月份中开始的时间
NSString *str = @"01 - 12 - 2012";
NSDateFormatter *formatter1 = [[[NSDateFormatter alloc] init] autorelease];
[formatter1 setDateFormat:@"dd - MM - yyyy"];
NSDate *date = [formatter1 dateFromString:str];
NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDateComponents *weekdayComponents = [gregorian components:(NSDayCalendarUnit | NSWeekdayCalendarUnit) fromDate:date];
NSInteger weekday = [weekdayComponents weekday];
int weekNumber = 2;
int dayOfweek = 2;
int x = (7 - weekday) * (weekNumber - 1) + dayOfweek;
// 添加第几个星期
if(x < 7)
{
x += 7 * (weekNumber - 1) + 1;
}
else
{
x += 7 * (weekNumber - 2) + 1;
}
``````
DaffodilGirl 谢谢你的回答，我根据你的回答自己写出来了实现代码
5 年多之前 回复