iOS 自定义日历

#import <UIKit/UIKit.h>

@interface CYCalenderView : UIView

@property (nonatomic,assign) NSInteger sYear;

@property (nonatomic,assign) NSInteger eYear;


-(CYCalenderView *)initWithFrame:(CGRect)rect;

@end

//
//  CYCalenderView.m
//  UIOne
//
//  Created by SaturdayNight on 2018/1/25.
//  Copyright © 2018年 SaturdayNight. All rights reserved.
//

#import "CYCalenderView.h"
#import "CalenderNumberCell.h"
#import <Masonry.h>
#import "CalenderManager.h"

static NSString *const kListWeekCell = @"CalenderNumberCell";
static NSString *const kListMonthCell = @"Month";

@interface CYCalenderView () <UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>

@property (nonatomic,strong) UILabel *lbData;   // 日期 年：月：日
@property (nonatomic,strong) UICollectionView *listWeek;    // 星期列表
@property (nonatomic,strong) NSArray *arrayListWeek;        // 星期数据

@property (nonatomic,strong) UICollectionView *listMonth;   // 月份列表
@property (nonatomic,strong) NSMutableArray *arrayListMonth; // 月份详细

@end

@implementation CYCalenderView

-(CYCalenderView *)initWithFrame:(CGRect)rect
{
    self = [super initWithFrame:rect];
    if (self) {
        // 设置需要显示的日历范围
        self.sYear = 2017;
        self.eYear = 2020;

        [self addSubview:self.listWeek];
        [self addSubview:self.listMonth];
        
        [self myLayout];
    }
    
    return self;
}

#pragma mark - Delegate
#pragma mark UICollectionViewDelegate
#pragma mark UICollectionViewDataSource
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    if (collectionView.tag == 101) {
        return 1;
    }
    else
    {
        return self.arrayListMonth.count;
    }
}

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    if (collectionView.tag == 101) {
        return self.arrayListWeek.count;
    }
    else
    {
        return 42 + 1;
    }
}

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    if (collectionView.tag == 101) {
        CalenderNumberCell *cell = (CalenderNumberCell *)[collectionView dequeueReusableCellWithReuseIdentifier:kListWeekCell forIndexPath:indexPath];
        
        cell.lbTitle.text = [NSString stringWithFormat:@"%@",[self.arrayListWeek objectAtIndex:indexPath.row]];
        cell.contentView.backgroundColor = CY_GET_UICOLOR(34, 182, 141, 1);
        cell.lbTitle.textColor = [UIColor whiteColor];
        
        return cell;
    }
    else
    {
        CalenderNumberCell *cell = (CalenderNumberCell *)[collectionView dequeueReusableCellWithReuseIdentifier:kListMonthCell forIndexPath:indexPath];
        
        NSDictionary *dic = self.arrayListMonth[indexPath.section];
        
        if (indexPath.row == 0) {
            cell.lbTitle.text = [dic objectForKey:@"Title"];
        }
        else
        {
            NSInteger firstWeekdayNum = [[dic objectForKey:@"FirstWeekdayNum"] integerValue];
            NSInteger totalDays = [[dic objectForKey:@"TotalDays"] integerValue];
            
            if (firstWeekdayNum > indexPath.row || (totalDays + firstWeekdayNum
                 - 1) < indexPath.row ) {
                cell.lbTitle.text = @"";
            }
            else
            {
                cell.lbTitle.text = [NSString stringWithFormat:@"%li",indexPath.row - firstWeekdayNum + 1];
            }
            
            cell.lbTitle.textColor = [UIColor blackColor];
        }
        
        return cell;
    }
}

#pragma mark - UICollectionViewDelegateFlowLayout
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    if (collectionView.tag == 101) {
        return CGSizeMake(self.frame.size.width / (self.arrayListWeek.count * 1.0), 35);
    }
    else
    {
        if (indexPath.row == 0) {
            return CGSizeMake(self.frame.size.width, 50);
        }
        else
        {
            return CGSizeMake(self.frame.size.width / (self.arrayListWeek.count * 1.0) - 1, 50);
        }
    }
}

#pragma mark - Layout
-(void)myLayout
{
    [self.listWeek mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self);
        make.right.equalTo(self);
        make.top.equalTo(self);
        make.height.equalTo(@35);
    }];
    
    [self.listMonth mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self);
        make.right.equalTo(self);
        make.top.equalTo(self.listWeek.mas_bottom);
        make.bottom.equalTo(self);
    }];
}

#pragma mark - LazyLoad
-(UILabel *)lbData
{
    if (!_lbData) {
        _lbData = [[UILabel alloc] init];
    }
    
    return _lbData;
}

-(UICollectionView *)listWeek
{
    if (!_listWeek) {
        UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
        layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
        layout.minimumLineSpacing = 0;
        layout.minimumInteritemSpacing = 0;
        
        layout.itemSize = CGSizeMake(35, 35);
        
        _listWeek = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        _listWeek.tag = 101;
        _listWeek.backgroundColor = CY_GET_UICOLOR(34, 182, 141, 1);
        _listWeek.showsVerticalScrollIndicator = NO;
        [_listWeek registerClass:[CalenderNumberCell class] forCellWithReuseIdentifier:kListWeekCell];
        _listWeek.dataSource = self;
        _listWeek.delegate = self;
    }
    
    return _listWeek;
}

-(NSArray *)arrayListWeek
{
    if (!_arrayListWeek) {
        _arrayListWeek = [NSArray arrayWithObjects:@"日",@"一",@"二",@"三",@"四",@"五",@"六", nil];
    }
    
    return _arrayListWeek;
}

-(UICollectionView *)listMonth
{
    if (!_listMonth) {
        UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
        layout.scrollDirection = UICollectionViewScrollDirectionVertical;
        layout.minimumLineSpacing = 0;
        layout.minimumInteritemSpacing = 0;
        
        layout.itemSize = CGSizeMake(35, 35);
        
        _listMonth = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        _listMonth.tag = 102;
        _listMonth.backgroundColor = [UIColor whiteColor];
        _listMonth.showsVerticalScrollIndicator = NO;
        [_listMonth registerClass:[CalenderNumberCell class] forCellWithReuseIdentifier:kListMonthCell];
        _listMonth.dataSource = self;
        _listMonth.delegate = self;
    }
    
    return _listMonth;
}

-(NSMutableArray *)arrayListMonth
{
    if (!_arrayListMonth) {
        _arrayListMonth = [NSMutableArray arrayWithCapacity:0];
        
        for (NSInteger year = self.sYear; year < (self.eYear + 1); year ++) {
            for (NSInteger month = 1; month < 13; month ++) {
                NSMutableDictionary *dicInfo = [NSMutableDictionary dictionaryWithCapacity:0];
                
                NSInteger num = [CalenderManager getWeekdayNumWithYear:year month:month day:1];
                NSInteger totalDays = [CalenderManager getDaysWithYear:year month:month];
                
                NSString *title = [NSString stringWithFormat:@"%li年%li月",year,month];
                
                [dicInfo setObject:[NSNumber numberWithInteger:num] forKey:@"FirstWeekdayNum"];
                [dicInfo setObject:[NSNumber numberWithInteger:totalDays] forKey:@"TotalDays"];
                [dicInfo setObject:title forKey:@"Title"];
                
                [_arrayListMonth addObject:dicInfo];
            }
        }
    }
    
    return _arrayListMonth;
}

@end

#import <UIKit/UIKit.h>

@interface CalenderNumberCell : UICollectionViewCell

@property (nonatomic,strong) UILabel *lbTitle;

@end

//
//  CalenderNumberCell.m
//  UIOne
//
//  Created by SaturdayNight on 2018/1/26.
//  Copyright © 2018年 SaturdayNight. All rights reserved.
//

#import "CalenderNumberCell.h"
#import <Masonry.h>

@implementation CalenderNumberCell

-(instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self.contentView addSubview:self.lbTitle];
        
        [self myLayout];
    }
    
    return self;
}

#pragma mark - Layout
-(void)myLayout
{
    [self.lbTitle mas_makeConstraints:^(MASConstraintMaker *make) {
        make.center.equalTo(self);
        make.right.equalTo(self);
        make.left.equalTo(self);
        make.height.mas_equalTo(60);
    }];
}

#pragma mark - LazyLoad
-(UILabel *)lbTitle
{
    if (!_lbTitle) {
        _lbTitle = [[UILabel alloc] init];
        _lbTitle.textAlignment = NSTextAlignmentCenter;
    }
    
    return _lbTitle;
}
@end

//
//  CalenderManager.h
//  UIOne
//
//  Created by SaturdayNight on 2018/1/26.
//  Copyright © 2018年 SaturdayNight. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface CalenderManager : NSObject

#pragma mark 获取传入日期 所对应的WeekDayNum 1表示星期天 2表示星期一 以此类推
+(NSInteger)getWeekdayNumWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day;

#pragma mark 获取传入日期 所对应的礼拜几
+(NSString *)getWeekdayStrWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day;

#pragma mark - 获取某一月的天数
+(NSInteger)getDaysWithYear:(NSInteger)year month:(NSInteger)month;

@end

//
//  CalenderManager.m
//  UIOne
//
//  Created by SaturdayNight on 2018/1/26.
//  Copyright © 2018年 SaturdayNight. All rights reserved.
//

#import "CalenderManager.h"

@implementation CalenderManager

#pragma mark 获取传入日期 所对应的WeekDayNum 1表示星期天 2表示星期一 以此类推
+(NSInteger)getWeekdayNumWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day
{
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateFormatter *format = [[NSDateFormatter alloc] init];
    format.dateFormat = @"yyyy-MM-dd";
    
    NSString *time = [NSString stringWithFormat:@"%li-%li-%li",year,month,day];
    NSDate *date = [format dateFromString:time];
    
    NSInteger num = [calendar component:NSCalendarUnitWeekday fromDate:date];
    
    return num;
}

#pragma mark 获取传入日期 所对应的礼拜几字符串
+(NSString *)getWeekdayStrWithYear:(NSInteger)year month:(NSInteger)month day:(NSInteger)day
{
    NSArray *array = [NSArray arrayWithObjects:@"星期天",@"星期一",@"星期二",@"星期三",@"星期四",@"星期六", nil];
    NSString *weekStr = [array objectAtIndex:[self getWeekdayNumWithYear:year month:month day:day]];
    
    return weekStr;
}

#pragma mark - 获取某一月的天数
+(NSInteger)getDaysWithYear:(NSInteger)year month:(NSInteger)month
{
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateFormatter *format = [[NSDateFormatter alloc] init];
    format.dateFormat = @"yyyy-MM";
    
    NSString *time = [NSString stringWithFormat:@"%li-%li",year,month];
    NSDate *date = [format dateFromString:time];
    
    NSRange range = [calendar rangeOfUnit:NSCalendarUnitDay
                                   inUnit: NSCalendarUnitMonth
                                  forDate:date];
    
    return range.length;
}

@end

//
//  CYCalenderVC.h
//  UIOne
//
//  Created by SaturdayNight on 2018/1/25.
//  Copyright © 2018年 SaturdayNight. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface CYCalenderVC : UIViewController

@end

//
//  CYCalenderVC.m
//  UIOne
//
//  Created by SaturdayNight on 2018/1/25.
//  Copyright © 2018年 SaturdayNight. All rights reserved.
//

#import "CYCalenderVC.h"
#import "CYCalenderView.h"
#import <Masonry.h>

@interface CYCalenderVC ()

@property (nonatomic,strong) CYCalenderView *calanderView;

@end

@implementation CYCalenderVC

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    [self.view addSubview:self.calanderView];
    
    [self myLayout];
}

#pragma mark - Layout
-(void)myLayout
{
    [self.calanderView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(self.view);
        make.left.equalTo(self.view);
        make.top.equalTo(self.view).mas_offset(64);
        make.bottom.equalTo(self.view);
    }];
}

#pragma mark - LazyLoad
-(CYCalenderView *)calanderView
{
    if (!_calanderView) {
        _calanderView = [[CYCalenderView alloc] initWithFrame:CGRectZero];
    }
    
    return _calanderView;
}

@end

一共4个类，创建后直接可以使用。

具体效果如下：