iOS自定義日歷控件的簡單實現過程

2020-07-26 03:09:51

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因為程序要求要插入一個日歷控件,該空間的要求是從當天開始及以后的六個月內的日歷,上網查資料基本上都說只要獲取兩個條件(當月第一天周幾和本月一共有多少天)就可以實現一個簡單的日歷,剩下的靠自己的簡單邏輯就OK了,下面開始自己從開始到完成的整個過程

1.首先做NSDate類目,擴展一些方法讓日期之間轉換更加方便

#import <Foundation/Foundation.h>@interface NSDate (LYWCalendar)#pragma mark - 獲取日- (NSInteger)day:(NSDate *)date;#pragma mark - 獲取月- (NSInteger)month:(NSDate *)date;#pragma mark - 獲取年- (NSInteger)year:(NSDate *)date;#pragma mark - 獲取當月第一天周幾- (NSInteger)firstWeekdayInThisMonth:(NSDate *)date;#pragma mark - 獲取當前月有多少天- (NSInteger)totaldaysInMonth:(NSDate *)date;@end

下面一一實現這些方法

#import "NSDate+LYWCalendar.h"@implementation NSDate (LYWCalendar)/** *實現部分 */#pragma mark -- 獲取日- (NSInteger)day:(NSDate *)date{ NSDateComponents *components = [[NSCalendar currentCalendar] components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay) fromDate:date]; return components.day;}#pragma mark -- 獲取月- (NSInteger)month:(NSDate *)date{ NSDateComponents *components = [[NSCalendar currentCalendar] components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay) fromDate:date]; return components.month;}#pragma mark -- 獲取年- (NSInteger)year:(NSDate *)date{ NSDateComponents *components = [[NSCalendar currentCalendar] components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay) fromDate:date]; return components.year;}#pragma mark -- 獲得當前月份第一天星期幾- (NSInteger)firstWeekdayInThisMonth:(NSDate *)date{ NSCalendar *calendar = [NSCalendar currentCalendar]; //設置每周的第一天從周幾開始,默認為1,從周日開始 [calendar setFirstWeekday:1];//1.Sun. 2.Mon. 3.Thes. 4.Wed. 5.Thur. 6.Fri. 7.Sat. NSDateComponents *comp = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay) fromDate:date]; [comp setDay:1]; NSDate *firstDayOfMonthDate = [calendar dateFromComponents:comp]; NSUInteger firstWeekday = [calendar ordinalityOfUnit:NSCalendarUnitWeekday inUnit:NSCalendarUnitWeekOfMonth forDate:firstDayOfMonthDate]; //若設置從周日開始算起則需要減一,若從周一開始算起則不需要減 return firstWeekday - 1;}#pragma mark -- 獲取當前月共有多少天- (NSInteger)totaldaysInMonth:(NSDate *)date{ NSRange daysInLastMonth = [[NSCalendar currentCalendar] rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:date]; return daysInLastMonth.length;}

接下來就要寫邏輯部分了,在ViewController里面實現,先說思想,首先想到的是用collectionView,但是每個月天數不一樣在日歷中的顯示就不一樣,有時候有五行有時候有六行,既然要用自動填充就必須考慮到這一點,下面是代碼實現

#import "ViewController.h"#import "Macro.h"#import "NSDate+LYWCalendar.h"#import "LYWCollectionViewCell.h"#import "LYWCollectionReusableView.h"

定義一些全局變量

static NSString *cellID = @"cellID";static NSString *headerID = @"headerID";static NSString *footerID = @"footerID";@implementation ViewController{ //自動布局 UICollectionViewFlowLayout *_layout; //表格視圖 UICollectionView *_collectionView; //當月第一天星期幾 NSInteger firstDayInMounthInWeekly; NSMutableArray *_firstMounth; //容納六個數組的數組 NSMutableArray *_sixArray; }

//定義星期視圖,若為周末則字體顏色為綠色 self.automaticallyAdjustsScrollViewInsets = NO;//關閉自動適應 NSArray *weekTitleArray = @[@"周日",@"周一",@"周二",@"周三",@"周四",@"周五",@"周六"]; for (int i = 0; i < weekTitleArray.count; i++) { UILabel *weekTitleLable = [[UILabel alloc]initWithFrame:CGRectMake(i * ((ScreenWidth/(weekTitleArray.count))), 64, ScreenWidth/(weekTitleArray.count ), 30)]; if (i == 0 || i == 6) {  weekTitleLable.textColor = [UIColor greenColor]; }else{  weekTitleLable.textColor = [UIColor blackColor]; } weekTitleLable.text = [weekTitleArray objectAtIndex:i]; weekTitleLable.textAlignment = NSTextAlignmentCenter; [self.view addSubview:weekTitleLable];}

//設置collectionView及自動布局,代理方法尤為重要 _layout = [[UICollectionViewFlowLayout alloc]init]; //頭部始終在頂端 _layout.sectionHeadersPinToVisibleBounds = YES; //頭部視圖高度 _layout.headerReferenceSize = CGSizeMake(414, 40); _layout.minimumLineSpacing = 0; _layout.minimumInteritemSpacing = 0; _collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 64 + 30, ScreenWidth, ScreenHeight - 64 - 30) collectionViewLayout:_layout]; _collectionView.backgroundColor = [UIColor whiteColor]; //注冊表格 [_collectionView registerClass:[LYWCollectionViewCell class] forCellWithReuseIdentifier:cellID]; //注冊頭視圖 [_collectionView registerClass:[LYWCollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:headerID]; //注冊尾視圖// [_collectionView registerClass:[UICollectionReusableView class] forCellWithReuseIdentifier:footerID];　　 _collectionView.delegate = self; _collectionView.dataSource = self; [self.view addSubview:_collectionView];

邏輯部分,這里有個比較長的三項表達式

(daysInMounth > 29 && (firstDayInThisMounth == 6 || firstDayInThisMounth ==5) ? 42 : 35)

就是日歷到底是六行還是七行,這就要根據日歷的特性來判斷了,如果當月天數大于29天并且當月第一天星期六(以這個程序的準則)或者星期天是返回六行剩下的返回三行,也有可能返回四行的,但是就這個程序來說是不可能的也就不需要做判斷了

 //NumberMounthes 為宏定義,表示要顯示月的個數,程序要求是六個月,所以宏定義為六　　//#define NumberMounthes 6 //想要展示的月數//創建六個數組,并將這六個數組裝入大數組中 _sixArray = [[NSMutableArray alloc]init]; for (int i = 0; i < NumberMounthes ; i++ ) { NSMutableArray *array = [[NSMutableArray alloc]init]; [_sixArray addObject:array]; } //為六個數組寫入每個月的日歷信息 for (int i = 0 ; i < NumberMounthes; i++) { //獲取月份 int mounth = ((int)[currentDate month:currentDate] + i)%12; NSDateComponents *components = [[NSDateComponents alloc]init]; //獲取下個月的年月日信息,并將其轉為date components.month = mounth; components.year = 2016 + mounth/12; components.day = 1; NSCalendar *calendar = [NSCalendar currentCalendar]; NSDate *nextDate = [calendar dateFromComponents:components]; //獲取該月第一天星期幾 NSInteger firstDayInThisMounth = [nextDate firstWeekdayInThisMonth:nextDate]; //該月的有多少天daysInThisMounth NSInteger daysInThisMounth = [nextDate totaldaysInMonth:nextDate]; NSString *string = [[NSString alloc]init]; for (int j = 0; j < (daysInMounth > 29 && (firstDayInThisMounth == 6 || firstDayInThisMounth ==5) ? 42 : 35) ; j++) {  if (j < firstDayInThisMounth || j > daysInThisMounth + firstDayInThisMounth - 1) {  string = @"";  [[_sixArray objectAtIndex:i]addObject:string];  }else{  string = [NSString stringWithFormat:@"%ld",j - firstDayInThisMounth + 1];  [[_sixArray objectAtIndex:i]addObject:string];  } } }

下面是代理方法

//這兩個不用說,返回cell個數及section個數- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{ return [[_sixArray objectAtIndex:section] count];}- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{ return _sixArray.count;}

//這里是自定義cell,非常簡單的自定義- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{ LYWCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellID forIndexPath:indexPath]; UIView *blackgroundView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, cell.frame.size.width, cell.frame.size.height)]; blackgroundView.backgroundColor = [UIColor yellowColor]; cell.dateLable.text = [[_sixArray objectAtIndex:indexPath.section]objectAtIndex:indexPath.row]; NSDate *date = [[NSDate alloc]init]; NSInteger day = [date day:date];　　//設置單擊后的顏色 　　cell.selectedBackgroundView = blackgroundView; return cell;}

自定義cell .h

#import <UIKit/UIKit.h>@interface LYWCollectionViewCell : UICollectionViewCell@property (nonatomic,strong) UILabel *dateLable;- (instancetype)initWithFrame:(CGRect)frame;@end

#import "LYWCollectionViewCell.h"@implementation LYWCollectionViewCell- (instancetype)initWithFrame:(CGRect)frame{ if (self == [super initWithFrame:frame]) { _dateLable = [[UILabel alloc] initWithFrame:self.bounds]; [_dateLable setTextAlignment:NSTextAlignmentCenter]; [_dateLable setFont:[UIFont systemFontOfSize:17]]; _dateLable.textColor = [UIColor blackColor]; [self addSubview:_dateLable]; } return self;}@end

接著代理

//cell大小及間距- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{ return CGSizeMake(ScreenWidth/7, ScreenWidth/7);}- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{ return UIEdgeInsetsMake(0, 0, 0, 0);}

既然有日歷,總得顯示哪年哪月吧,前面已經注冊表頭視圖了,這里只需要實現以下代理方法即可

collectionView有點不同其頭視圖也有單獨的類,和cell一樣先自定義headCell,也是非常簡單的自定義

.h文件

#import <UIKit/UIKit.h>@interface LYWCollectionReusableView : UICollectionReusableView@property (nonatomic,strong) UILabel *dateLable;- (instancetype)initWithFrame:(CGRect)frame;@end

.m文件

#import "LYWCollectionReusableView.h"@implementation LYWCollectionReusableView- (instancetype)initWithFrame:(CGRect)frame{ if (self == [super initWithFrame:frame]) { _dateLable = [[UILabel alloc] initWithFrame:self.bounds]; [_dateLable setTextAlignment:NSTextAlignmentLeft]; [_dateLable setFont:[UIFont systemFontOfSize:20]]; _dateLable.textColor = [UIColor blackColor]; [self addSubview:_dateLable]; } return self;}@end

接著代理方法,這里也有個三項判斷式,和上面的大同小異,主要是防止12月顯示為0月

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{ if (kind == UICollectionElementKindSectionHeader) { LYWCollectionReusableView *headerRV = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:headerID forIndexPath:indexPath]; //自定義藍色 headerRV.backgroundColor = DODGER_BLUE; NSDate *currentDate = [[NSDate alloc]init]; NSInteger year = ([currentDate month:currentDate] + indexPath.section)/12 + 2016; NSInteger mounth = ([currentDate month:currentDate] + indexPath.section) % 12 == 0 ? 12 : ([currentDate month:currentDate] + indexPath.section)%12; headerRV.dateLable.text = [NSString stringWithFormat:@"%ld年%ld月",year,mounth]; return headerRV; }else{ return nil; }}

還是代理,處理選中效果,選中的為黃色

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{ LYWCollectionViewCell *cell = [self collectionView:_collectionView cellForItemAtIndexPath:indexPath]; NSDate *currentDate = [[NSDate alloc]init]; //打印當前日期 if (![cell.dateLable.text isEqualToString:@""]) { NSInteger year = ([currentDate month:currentDate] + indexPath.section)/12 + 2016; NSInteger mounth = ([currentDate month:currentDate] + indexPath.section)%12; NSInteger day = [cell.dateLable.text intValue]; NSLog(@"%ld年%02ld月%02ld日",year,mounth,day); } //排除空值cell //獲取月份 NSInteger mounth = ([currentDate month:currentDate] + indexPath.section) % 12 == 0 ? 12 : ([currentDate month:currentDate] + indexPath.section)%12; NSDateComponents *components = [[NSDateComponents alloc]init]; components.month = mounth; components.year = 2016 + mounth/12; components.day = 1; NSCalendar *calendar = [NSCalendar currentCalendar]; NSDate *nextDate = [calendar dateFromComponents:components]; //獲取該月第一天星期幾 NSInteger firstDayInThisMounth = [nextDate firstWeekdayInThisMonth:nextDate]; //該月的有多少天daysInThisMounth NSInteger daysInThisMounth = [nextDate totaldaysInMonth:nextDate]; if ((indexPath.row < firstDayInThisMounth || indexPath.row > daysInThisMounth + firstDayInThisMounth - 1)){ //如果點擊空表格則單擊無效 [collectionView cellForItemAtIndexPath:indexPath].userInteractionEnabled = NO; [collectionView reloadData]; }}

最后展示很爛的效果圖: