时间日历控件

日历时间生成

关于日历就看这一个类NSCalendar就可以，结合日期拆解析类NSDateComponents就可以搞定日历相关各种奇葩问题了

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/** * 获取当前日期是周几 * * @return 输出结果是星期几的字符串。 */ -(NSString *)weekday { NSDateComponents *comps = [calendar components:NSCalendarUnitWeekday fromDate:self]; NSArray *weekdays = [NSArray arrayWithObjects: [NSNull null], @"0", @"1", @"2", @"3", @"4", @"5", @"6", nil]; return [weekdays objectAtIndex:comps.weekday]; } -(NSString *)weekdayString { NSString *week = [self weekday]; NSDictionary *map = @{@"0" : @"周日", @"1" : @"周一", @"2" : @"周二", @"3" : @"周三", @"4" : @"周四", @"5" : @"周五", @"6" : @"周六", }; return map[week]; }

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/** * 获取当前日期所在月的第一天是周几 * * @return 输出结果是星期几的字符串。 */ -(NSString *)firstWeekdayInCurrentMonth { double interval = 0; NSDate *beginDate = nil; NSDate *endDate = nil; NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian]; calendar.timeZone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];; [calendar setFirstWeekday:2];//设定周一为周首日 BOOL ok = [calendar rangeOfUnit:NSCalendarUnitMonth startDate:&beginDate interval:&interval forDate:self]; //分别修改为 NSDayCalendarUnit NSWeekCalendarUnit NSYearCalendarUnit if (ok) { endDate = [beginDate dateByAddingTimeInterval:interval-1]; }else { return @""; } return [beginDate weekday]; }

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/** * 获取当前日期所在月有多少天 * * @return 天数 */ -(NSInteger)daysInCurrentMonth { NSRange range =[calendar rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:self]; return range.length; }

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/** * 获取当前日期所在月的下offset个月 * * @return 获得时间 */ -(NSDate *)dateOffsetMonth:(NSInteger)offset { NSDateComponents *comps = [[NSDateComponents alloc] init]; comps.month = offset; return [calendar dateByAddingComponents:comps toDate:self options:0]; }

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/** * 获取当前日期的下offset个日期 * * @return 获得时间 */ -(NSDate *)dateOffsetDay:(NSInteger)offset { NSDateComponents *comps = [[NSDateComponents alloc] init]; comps.day = offset; 大专栏  时间日历控件ne"> return [calendar dateByAddingComponents:comps toDate:self options:0]; }

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+(NSDate *)dateFromSelectIndex:(NSIndexPath *)indexPath { NSDate *date = [[NSDate date] dateOffsetMonth:indexPath.section]; NSInteger day = indexPath.row - [date firstWeekdayInCurrentMonth].integerValue + 1; NSDateComponents *comp = [[NSDateComponents alloc] init]; comp.year = date.components.year; comp.month = date.components.month; comp.day = day; return [calendar dateFromComponents:comp]; } -(NSIndexPath *)indexPath { // 上面的反推 monthOffset 要注意，年末最后一天 和 下一年的一月的处理，所以通过判断若两者月相等section就等于0，不等的话，有可能是大于，有可能是小于(比如当前月2016-12，下个月2017-01) NSInteger row = self.components.day-1+[self firstWeekdayInCurrentMonth].integerValue; NSInteger monthOffset = (self.components.month == [NSDate date].components.month) ? 0 : 1; return [NSIndexPath indexPathForRow:row inSection:monthOffset]; }

日历时间UI相关

显示日历大都是UICollectionView 这个很简单，想怎么显示直接写cell就行。

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#pragma mark collectionview delegate - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 2; } - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { NSDate *date = [[NSDate date] dateOffsetMonth:section]; return [date daysInCurrentMonth] + [date firstWeekdayInCurrentMonth].integerValue; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { DatePickerCell *cell =[collectionView dequeueReusableCellWithReuseIdentifier:datePickerCellReuse forIndexPath:indexPath]; [cell updateCellIndex:indexPath select:(_selectIndex == indexPath)]; return cell; } - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath { if ([kind isEqualToString:UICollectionElementKindSectionHeader]) { DatePickerHeaderView * headerCell = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:datePickerHeaderReuse forIndexPath:indexPath]; NSDate *date = [[NSDate date] dateOffsetMonth:indexPath.section]; headerCell.tipLab.text = [date ymString]; return headerCell; }else if ([kind isEqualToString:UICollectionElementKindSectionFooter]){ DatePickerFooterView * footerCell = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:datePickerFooterReuse forIndexPath:indexPath]; footerCell.hidden = !(indexPath.section == 0); return footerCell; } return nil; } - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{ [collectionView deselectItemAtIndexPath:indexPath animated:YES]; _selectIndex = indexPath; [collectionView reloadData]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.4*NSEC_PER_SEC), dispatch_get_main_queue(), ^{ if (selectBlock) { selectBlock(); } [self.navigationController popViewControllerAnimated:YES]; }); }

详细完整工程，请查看 github