iphone - 显示当前周的开始和结束日期

Question

我想显示当前周，UINavigationBar然后单击下一个或上一个按钮以显示上一周或下周

例子：

7 月 22 日 - 7 月 28 日
7 月 29 日 - 8 月 4 日

Answer 1

要获得一周的第一个日期，您可以执行以下操作：

- (NSDate *)firstDayOfWeekFromDate:(NSDate *)date {
    CFCalendarRef currentCalendar = CFCalendarCopyCurrent();
    NSDateComponents *components = [CURRENT_CALENDAR components:DATE_COMPONENTS  fromDate:date];
    [components setDay:([components day] - ([components weekday] - CFCalendarGetFirstWeekday(currentCalendar)))];
    //[components setDay:(CFCalendarGetFirstWeekday(currentCalendar))];
    [components setHour:0];
    [components setMinute:0];
    [components setSecond:0];
    CFRelease(currentCalendar);
    return [CURRENT_CALENDAR dateFromComponents:components];
}

在获得一天的第一周后，您可以按照@vikas 上述答案中的建议计算天数：)

Answer 2

 NSDate * selectedDate = [NSDate date];


-(IBAction)Week_CalendarActionEvents:(id)sender{

NSCalendar *gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease];
NSDateComponents *offsetComponents = [[[NSDateComponents alloc] init] autorelease];
NSDate *nextDate;

if(sender==Week_prevBarBtn)  // Previous button events 
    [offsetComponents setDay:-7];
else if(sender==Week_nextBarBtn) // next button events 
    [offsetComponents setDay:7];

nextDate = [gregorian dateByAddingComponents:offsetComponents toDate:selectedDate options:0];

selectedDate = nextDate;
[selectedDate retain];

NSDateComponents *components = [gregorian components:NSWeekCalendarUnit fromDate:selectedDate];
NSInteger week = [components week];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"MMMM YYYY"];
NSString *stringFromDate = [formatter stringFromDate:selectedDate];
[formatter release];
[Week_weekBarBtn setTitle:[NSString stringWithFormat:@"%@,Week %d",stringFromDate,week]];

}