先看下效果图：
rili.jpg
一个简单的自定义日历需求，一周从日开始，上个月的日期为灰色，点击cell选中日期并返回结果。ok！下面上菜～
1.我们先封装一个日期的类YBKDateItem，包括当前日期，具体是所属月的哪号，在UICollectionView中显示是否是属于当前月
@interface YBKDateItem : NSObject
@property (nonatomic, copy) NSString *dateString;
@property (nonatomic, assign) NSInteger day; //几号
@property (nonatomic, assign) BOOL isCurrentMonth;
+ (YBKDateItem *)dateItemWithDateString:(NSString *)dateString Day:(NSInteger)day IsCurrentMonth:(BOOL)isCurrentMonth;
@end
#import "YBKDateItem.h"
@implementation YBKDateItem
+ (YBKDateItem *)dateItemWithDateString:(NSString *)dateString Day:(NSInteger)day IsCurrentMonth:(BOOL)isCurrentMonth {
YBKDateItem *item = [[YBKDateItem alloc] init];
item.dateString = dateString;
item.day = day;
item.isCurrentMonth = isCurrentMonth;
return item;
}
@end
- 再来自定义UICollectionViewCell，包括一个显示日期的label，是否是默认日期
#import <UIKit/UIKit.h>
@class YBKDateItem;
@interface YBKDatePickerCell : UICollectionViewCell
@property (nonatomic, strong) UILabel *textLabel;
- (void)setCellWithDateItem:(YBKDateItem *)item;
@property (nonatomic, assign) BOOL isDefault; //是否是默认日期
@end
#import "YBKDatePickerCell.h"
#import "YBKDateItem.h"
@interface YBKDatePickerCell ()
@property (nonatomic, strong) YBKDateItem *item;
@end
@implementation YBKDatePickerCell
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
self.textLabel = [UILabel new];
self.textLabel.text = @"33";
self.textLabel.textAlignment = 1;
self.textLabel.textColor = RGBA(212, 212, 212, 212);
self.textLabel.layer.cornerRadius = self.contentView.bounds.size.height / 2;
self.textLabel.layer.masksToBounds = YES;
[self addSubview:self.textLabel];
[self.textLabel mas_makeConstraints:^(MASConstraintMaker *make) {
make.center.equalTo(self.contentView);
make.width.height.mas_equalTo(self.contentView.mas_height);
}];
}
return self;
}
- (void)setSelected:(BOOL)selected {
[super setSelected:selected];
if (selected) {
self.textLabel.backgroundColor = kColor_Blue;
self.textLabel.textColor = [UIColor whiteColor];
} else {
if (self.isDefault) {
self.textLabel.backgroundColor = [UIColor orangeColor];
self.textLabel.textColor = [UIColor whiteColor];
} else {
self.textLabel.backgroundColor = [UIColor whiteColor];
if (self.item.isCurrentMonth) {
self.textLabel.textColor = [UIColor blackColor];
} else {
self.textLabel.textColor = RGBA(212, 212, 212, 212);
}
}
}
}
- (void)setIsDefault:(BOOL)isDefault {
if (isDefault) {
self.textLabel.backgroundColor = [UIColor orangeColor];
self.textLabel.textColor = [UIColor whiteColor];
} else {
self.textLabel.backgroundColor = [UIColor whiteColor];
if (self.item.isCurrentMonth) {
self.textLabel.textColor = [UIColor blackColor];
} else {
self.textLabel.textColor = RGBA(212, 212, 212, 212);
}
}
}
- (void)setCellWithDateItem:(YBKDateItem *)item {
self.textLabel.text = [NSString stringWithFormat:@"%ld", item.day];
self.item = item;
if (item.isCurrentMonth) {
self.textLabel.textColor = [UIColor blackColor];
} else {
self.textLabel.textColor = RGBA(212, 212, 212, 212);
}
}
3.下面是关于日历选择view的封装，先看看YBKDatePickerView.h中的代码
@interface YBKDatePickerView : UIView
- (instancetype)initWithFrame:(CGRect)frame WithDefaultDateString:(NSString *)defaultDateStr;
@property (nonatomic, copy) void(^YBKDatePickerBlock)(NSString *selectDate);
@end
再瞅瞅正餐
#define kHeight_Cell 30
@interface YBKDatePickerView () <UICollectionViewDelegate, UICollectionViewDataSource, UIGestureRecognizerDelegate>
@property (nonatomic, strong) UILabel *dateLabel;
@property (nonatomic, strong) UIButton *preBtn;
@property (nonatomic, strong) UIButton *nextBtn;
@property (nonatomic, strong) UICollectionView *collectionView;
//dataArr数据有5*7 或者6*7个（包括本月日期个数和上月尾下月初）
@property (nonatomic, strong) NSMutableArray *dataArr;
@property (nonatomic, strong) NSArray *weekArr; //用于一周七天创建周天
@property (nonatomic, assign) NSInteger weeksInMonths; //每个月有几周
@property (nonatomic, assign) NSInteger firstDayIndex; //每个月第一天是周几
@property (nonatomic, strong) NSCalendar *calendar;
@property (nonatomic, copy) NSString *defaultDateString; //默认日期
@end
UI创建放到最后面，先看看最重要的日期计算
- (void)getDateData {
NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];//设置时区
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:timeZone];
[dateFormatter setDateFormat:@"yyyy年MM月"];
//先判断当前label是否有日期，没有的话，就显示获取默认日期
if (self.dateLabel.text == nil) {
self.dateLabel.text = [dateFormatter stringFromDate:[NSDate date]];
}
NSDate *date = [dateFormatter dateFromString:self.dateLabel.text];
NSInteger interval = [timeZone secondsFromGMTForDate: date];
date = [date dateByAddingTimeInterval:interval];
//计算日期items
NSDateComponents *components = [self.calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitWeekday fromDate:date];
//获取该月有几周
self.weeksInMonths = [self.calendar rangeOfUnit:NSCalendarUnitWeekOfMonth inUnit:NSCalendarUnitMonth forDate:date].length;
//获取每个月第一天是周几，或当前默认日期是周几
self.firstDayIndex = [self.calendar ordinalityOfUnit:NSCalendarUnitWeekday inUnit:NSCalendarUnitWeekOfMonth forDate:date];
NSDate *tmpDate =[self.calendar dateFromComponents:components];
//日期格式化
NSDateFormatter *dayDateFormatter = [[NSDateFormatter alloc] init];
[dayDateFormatter setDateFormat:@"yyyy-MM-dd"];
//初始化一个临时的数组，用于存放计算的日期
NSMutableArray *tmpArr = [NSMutableArray arrayWithCapacity:42];
//计算上个月剩余的天数
for (int i = 1; i < self.firstDayIndex; i++) {
NSDate *preDate = [NSDate dateWithTimeInterval:-24*60*60 * (self.firstDayIndex - i) sinceDate:tmpDate];
NSDateComponents *daycoms = [self.calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitWeekday fromDate:preDate];
YBKDateItem *item = [YBKDateItem dateItemWithDateString:[dayDateFormatter stringFromDate:preDate] Day:daycoms.day IsCurrentMonth:NO];
[tmpArr addObject:item];
}
//计算本月天数
NSInteger allDays = [self.calendar rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:date].length;
for (int i = 1; i <= allDays; i++) {
NSDateComponents *daycoms = [self.calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitWeekday fromDate:tmpDate];
daycoms.day = i;
NSDate *curDate = [self.calendar dateFromComponents:daycoms];
YBKDateItem *item = [YBKDateItem dateItemWithDateString:[dayDateFormatter stringFromDate:curDate] Day:daycoms.day IsCurrentMonth:YES];
[tmpArr addObject:item];
}
//计算下个月露出来的天数
NSString *lastDateString = ((YBKDateItem *)[tmpArr lastObject]).dateString;
NSDate *lastDate = [dayDateFormatter dateFromString:lastDateString];
NSInteger lastInterval = [timeZone secondsFromGMTForDate:lastDate];
lastDate = [lastDate dateByAddingTimeInterval:lastInterval];
NSInteger count = (self.weeksInMonths * 7 -tmpArr.count);
for (int i = 1; i <= count; i++) {
NSDate *nextDate = [NSDate dateWithTimeInterval:24*60*60 * i sinceDate:lastDate];
NSDateComponents *daycoms = [self.calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitWeekday fromDate:nextDate];
YBKDateItem *item = [YBKDateItem dateItemWithDateString:[dayDateFormatter stringFromDate:nextDate] Day:daycoms.day IsCurrentMonth:NO];
[tmpArr addObject:item];
}
//计算over，刷新collectionview
self.dataArr = tmpArr;
[self.collectionView reloadData];
}
然后就是点击上个月，下个月的按钮后的数据处理
- (void)getNextMonthDateForType:(BOOL)isNextMonth {
NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];//设置时区
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:timeZone];
[dateFormatter setDateFormat:@"yyyy年M月"];
NSDate *date = [dateFormatter dateFromString:self.dateLabel.text];
NSInteger interval = [timeZone secondsFromGMTForDate: date];
date = [date dateByAddingTimeInterval:interval];
NSLog(@"日期：%@", date);
//每个月有几周
self.weeksInMonths = [self.calendar rangeOfUnit:NSCalendarUnitWeekOfMonth inUnit:NSCalendarUnitMonth forDate:date].length;
//每个月第一天是周几
self.firstDayIndex = [self.calendar ordinalityOfUnit:NSCalendarUnitWeekday inUnit:NSCalendarUnitWeekOfMonth forDate:date];
NSDateComponents *components = [self.calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitWeekday fromDate:date];
//计算下一个月是几月份
if (isNextMonth) {
//下个月
components.month += 1;
if (components.month > 12) {
components.year += 1;
components.month -= 12;
}
} else {
components.month -= 1;
if (components.month <= 0) {
components.year -= 1;
components.month += 12;
}
}
self.dateLabel.text = [NSString stringWithFormat:@"%ld年%ld月", components.year, components.month];
[self getDateData];
}
再后面就是UI布局了，篇幅原因懒得贴代码了，自行想象吧～～
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
YBKDatePickerCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"YBKDatePickerCellReuse" forIndexPath:indexPath];
YBKDateItem *item = self.dataArr[indexPath.row];
[cell setCellWithDateItem:item];
if ([self.defaultDateString isEqualToString:item.dateString]) {
cell.isDefault = YES;
} else {
cell.isDefault = NO;
}
return cell;
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
YBKDatePickerCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"YBKDatePickerCellReuse" forIndexPath:indexPath];
YBKDateItem *item = self.dataArr[indexPath.row];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.5f * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
if (self.YBKDatePickerBlock) {
self.YBKDatePickerBlock(item.dateString);
[self removeFromSuperview];
}
});
}
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