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#import "ViewController.h"
#import "LYCalender.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    LYCalender *calender = [[LYCalender alloc] initWithFrame:CGRectMake(0, 100, 320, 250)];
    [calender customCellView:^(NSString *dayNumber,UIView *superView) {
        UILabel *label1 = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, superView.frame.size.width, superView.frame.size.height / 2)];
        label1.textAlignment = NSTextAlignmentCenter;
        label1.font = [UIFont systemFontOfSize:14];
        label1.text = dayNumber;
        [superView addSubview:label1];
        UILabel *label2 = [[UILabel alloc] initWithFrame:CGRectMake(0, superView.frame.size.height / 2, superView.frame.size.width, superView.frame.size.height / 2)];
        label2.textAlignment = NSTextAlignmentCenter;
        label2.font = [UIFont systemFontOfSize:10];
        label2.text = @"¥998";
        [superView addSubview:label2];
    }];
    [calender customCellSelect:^(UIView *view) {
        NSLog(@"123");
    }];
    [self.view addSubview:calender];
}
#import <UIKit/UIKit.h>
typedef void(^CellView)(NSString *dayNumber,UIView *superView);
typedef void(^CellSelect)(UIView *view);
@interface LYCalender : UIView
// 设置每个item显示的内容
- (void)customCellView:(CellView)cellView;
// 设置每个item点击时触发的时间
- (void)customCellSelect:(CellSelect)cellSelect;
@end
#import "LYCalender.h"
#import "LYCalenderCell.h"
#import "MouthModel.h"

#define KWidth self.frame.size.width
#define KHeight self.frame.size.height
#define KYearDisplayNum 10
@interface LYCalender ()<UICollectionViewDelegateFlowLayout,UICollectionViewDataSource>
// 设置collectionView
@property (nonatomic,strong)UICollectionView *collectionView;
// 显示2016年10月格式信息
@property (nonatomic,strong)UILabel *timeLabel;
// 用来存放model数据源
@property (nonatomic,strong)NSMutableArray *dataAry;
// item的视图block
@property (nonatomic,copy)CellView cellView;
// item的点击事件
@property (nonatomic,copy)CellSelect cellSelect;
@end
static NSString *indentifier = @"LYCalenderCell";
@implementation LYCalender
// 懒加载
- (NSMutableArray *)dataAry{
    if (!_dataAry) {
        self.dataAry = [NSMutableArray array];
    }
    return _dataAry;
}
// 重写初始化方法
- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor whiteColor];
        // 设置表头
        [self setWeekDateStr];
        // 计算日期
        [self customDate];
        // 自定义子视图
        [self set_up];
    }
    return self;
}
// 设置表头
- (void)setWeekDateStr{
    NSArray *weekDayAry = @[@"周日",@"周一",@"周二",@"周三",@"周四",@"周五",@"周六"];
    for (int i = 0; i < 7; i++) {
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(i * (KWidth / 7), KHeight / 8, KWidth / 7, KHeight / 8)];
        label.text = weekDayAry[i];
        label.textAlignment = NSTextAlignmentCenter;
        label.textColor = [UIColor lightGrayColor];
        label.font = [UIFont systemFontOfSize:12];
        [self addSubview:label];
    }
    self.timeLabel = [[UILabel alloc] initWithFrame:CGRectMake(KWidth / 2 - 60, 0, 120, KHeight / 8)];
    _timeLabel.textAlignment = NSTextAlignmentCenter;
    _timeLabel.font = [UIFont systemFontOfSize:12];
    [self addSubview:_timeLabel];
}
// 根据滚动修改显示年月
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
   NSInteger num = (NSInteger)floor(self.collectionView.contentOffset.y / self.collectionView.frame.size.height);
    MouthModel *mouthModel = self.dataAry[num];
    _timeLabel.text = mouthModel.timeStr;
}
// 对数据初始化
- (void)customCellView:(CellView)cellView{
    self.cellView = cellView;
}
- (void)customCellSelect:(CellSelect)cellSelect{
    self.cellSelect = cellSelect;
}
// 自定义子视图
- (void)set_up{

    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
    flowLayout.minimumLineSpacing = 0;
    flowLayout.minimumInteritemSpacing = 0;
    flowLayout.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0);
    flowLayout.scrollDirection = UICollectionViewScrollDirectionVertical;
    self.collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, KHeight / 8 * 2, KWidth, KHeight / 8 * 6) collectionViewLayout:flowLayout];
    _collectionView.pagingEnabled = YES;
    _collectionView.showsVerticalScrollIndicator = NO;
    _collectionView.dataSource = self;
    _collectionView.delegate = self;
    _collectionView.backgroundColor = [UIColor whiteColor];
    [self addSubview:_collectionView];
    NSIndexPath *indexPath = [NSIndexPath indexPathForItem:0 inSection:12 * KYearDisplayNum - 1];
    [_collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:(UICollectionViewScrollPositionTop) animated:NO];
    [self.collectionView registerClass:[LYCalenderCell class] forCellWithReuseIdentifier:indentifier];
}
#pragma mark - collectionView的代理方法 -
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
    return self.dataAry.count;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return 42;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    LYCalenderCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:indentifier forIndexPath:indexPath];
    for (UIView *view in cell.contentView.subviews) {
        [view removeFromSuperview];
    }
    MouthModel *mouthModel = self.dataAry[indexPath.section];
    if (indexPath.row < mouthModel.dayDataAry.count && indexPath.row >= mouthModel.firstDayForWeekDay - 1) {
        UIView *view = [[UIView alloc] initWithFrame:cell.contentView.frame];
        CGRect frame = cell.contentView.frame;
        frame.size.width = frame.size.width / 6 * 4;
        frame.origin.x = frame.size.width / 6;
        frame.size.height = frame.size.height / 8 * 7;
        frame.origin.y = frame.size.height / 9;
        view.frame = frame;
        [cell.contentView addSubview:view];
        self.cellView(mouthModel.dayDataAry[indexPath.row],view);
    }
    return cell;
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
   MouthModel *mouthModel = self.dataAry[indexPath.section];
    if (indexPath.row < mouthModel.dayDataAry.count && indexPath.row >= mouthModel.firstDayForWeekDay - 1) {
        LYCalenderCell *cell = (LYCalenderCell *)[collectionView cellForItemAtIndexPath:indexPath];
        self.cellSelect(cell.contentView.subviews[0]);
    }
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
    return CGSizeMake(KWidth / 7, (KHeight - 0) / 8 );
}
// 进行日历计算
- (void)customDate{
    NSCalendar *calender = [NSCalendar calendarWithIdentifier:NSCalendarIdentifierGregorian];
    for (int i = 12 * KYearDisplayNum; i > 1; i--) {
        NSDate *date = [NSDate dateWithTimeIntervalSinceNow:- (i - 1) * 24 * 32 * 60 * 60];
        MouthModel *mouthModel = [[MouthModel alloc] init];
        // 设置一个月有多少天
        mouthModel.dayNumber = [calender rangeOfUnit:NSCalendarUnitDay inUnit:(NSCalendarUnitMonth) forDate:date].length;
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setDateFormat:@"YYYY年MM月"];
        // 设置时间字符串
        mouthModel.timeStr = [formatter stringFromDate:date];
        NSDateFormatter *dateFor = [[NSDateFormatter alloc] init];
        [dateFor setDateStyle:(NSDateFormatterMediumStyle)];
        [dateFor setTimeStyle:(NSDateFormatterNoStyle)];
        [dateFor setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
        [dateFor setDateFormat:@"YYYY-MM-dd"];
        [formatter setDateFormat:@"YYYY-MM"];
        NSDate *firstDate = [dateFor dateFromString:[NSString stringWithFormat:@"%@-01",[formatter stringFromDate:date]]];
        mouthModel.firstDayForWeekDay = [calender component:(NSCalendarUnitWeekday) fromDate:firstDate];
        for (int i = 1; i < mouthModel.firstDayForWeekDay; i++) {
            [mouthModel.dayDataAry insertObject:@"" atIndex:0];
        }
        [self.dataAry addObject:mouthModel];
    }
    for (int i = 1; i <= 12 * KYearDisplayNum; i++) {
        NSDate *date = [NSDate dateWithTimeIntervalSinceNow:(i - 1) * 24 * 32 * 60 * 60];
        MouthModel *mouthModel = [[MouthModel alloc] init];
        mouthModel.dayNumber = [calender rangeOfUnit:NSCalendarUnitDay inUnit:(NSCalendarUnitMonth) forDate:date].length;
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        [formatter setDateFormat:@"YYYY年MM月"];
        mouthModel.timeStr = [formatter stringFromDate:date];
        NSDateFormatter *dateFor = [[NSDateFormatter alloc] init];
        [dateFor setDateStyle:(NSDateFormatterMediumStyle)];
        [dateFor setTimeStyle:(NSDateFormatterNoStyle)];
        [dateFor setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
        [dateFor setDateFormat:@"YYYY-MM-dd"];
        [formatter setDateFormat:@"YYYY-MM"];
        NSDate *firstDate = [dateFor dateFromString:[NSString stringWithFormat:@"%@-01",[formatter stringFromDate:date]]];
        mouthModel.firstDayForWeekDay = [calender component:(NSCalendarUnitWeekday) fromDate:firstDate];
        for (int i = 1; i < mouthModel.firstDayForWeekDay; i++) {
            [mouthModel.dayDataAry insertObject:@"" atIndex:0];
        }
        [self.dataAry addObject:mouthModel];
    }
}
@end

#import <UIKit/UIKit.h>
@interface LYCalenderCell : UICollectionViewCell
@end

#import "LYCalenderCell.h"
@implementation LYCalenderCell
@end
#import <Foundation/Foundation.h>
@interface MouthModel : NSObject
@property (nonatomic,copy)NSString *timeStr;
@property (nonatomic,assign)NSInteger dayNumber;
@property (nonatomic,assign)NSInteger firstDayForWeekDay;
@property (nonatomic,strong)NSMutableArray *dayDataAry;
@end
#import "MouthModel.h"
@implementation MouthModel
- (NSMutableArray *)dayDataAry{
    if (!_dayDataAry) {
        self.dayDataAry = [NSMutableArray array];
    }
    return _dayDataAry;
}
- (void)setDayNumber:(NSInteger)dayNumber{
    _dayNumber = dayNumber;
    for (int i = 1; i <= dayNumber; i++) {
        [self.dayDataAry addObject:[NSString stringWithFormat:@"%d",i]];
    }
}
@end