【每日一博】iOS 开发一款小巧简洁的日历控件
iOS开发一款小巧简洁的日历控件
一、引言
日 历是iOS开发中有时会用到的一个UI控件，网上开源的代码也很多，我浏览过一些，大致有两种模式，一种是日历的逻辑由开发者自己实现，通过计算闰年与平 年来确定月份天数，另外一种模式是通过NSDate这个时间类，来获取日历的信息。我个人认为后一种更加安全，代码性能也会更加优质，下面就是我用这种模 式实现的一个日历控件。
二、设计思路
1、先来看下效果吧
2、我们需要实现的功能
（1）每行7天，对应星期，列数为将当前月显示完全
（2）今日标红
（3）点击的日期背景填充
（4）提供特殊标记，用于标记计划日，节日等
（5）左右无限翻页，直到世界起源和末日
3、设计步骤
（1）设计一个日历模型
#import "YHBaseModel.h" @interface YHBaseDateModel : YHBaseModel @property(nonatomic,strong)NSString * year; @property(nonatomic,strong)NSString * month; @property(nonatomic,strong)NSString * day; @end
（2）向系统的NSDate类中添加一些扩展方法，便于我们使用
//头文件部分 @interface NSDate (YHBaseCalendar) /** *获取当前月的天数 */ - (NSUInteger)YHBaseNumberOfDaysInCurrentMonth; /** *获取本月第一天 */ - (NSDate *)YHBaseFirstDayOfCurrentMonth; //下面这些方法用于获取各种整形的数据 /** *确定某天是周几 */ -(int)YHBaseWeekly; /** *年月日 时分秒 */ -(int)getYear; -(int)getMonth; -(int)getDay; -(int)getHour; -(int)getMinute; -(int)getSecond; @end //实现部分 @implementation NSDate (YHBaseCalendar) -(NSUInteger)YHBaseNumberOfDaysInCurrentMonth{ return [[NSCalendar currentCalendar] rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:self].length; } - (NSDate *)YHBaseFirstDayOfCurrentMonth { NSDate *startDate = nil; BOOL ok = [[NSCalendar currentCalendar] rangeOfUnit:NSMonthCalendarUnit startDate:&startDate interval:NULL forDate:self]; NSAssert1(ok, @"Failed to calculate the first day of the month based on %@", self); return startDate; } -(int)YHBaseWeekly{ return (int)[[NSCalendar currentCalendar] ordinalityOfUnit:NSDayCalendarUnit inUnit:NSWeekCalendarUnit forDate:self]; } -(int)getYear{ NSCalendar *calendar = [NSCalendar currentCalendar]; NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:self]; return (int)dateComponent.year; } -(int)getMonth{ NSCalendar *calendar = [NSCalendar currentCalendar]; NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:self]; return (int)dateComponent.month; } -(int)getDay{ NSCalendar *calendar = [NSCalendar currentCalendar]; NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:self]; return (int)dateComponent.day; } -(int)getHour{ NSCalendar *calendar = [NSCalendar currentCalendar]; NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:self]; return (int)dateComponent.hour; } -(int)getMinute{ NSCalendar *calendar = [NSCalendar currentCalendar]; NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:self]; return (int)dateComponent.minute; } -(int)getSecond{ NSCalendar *calendar = [NSCalendar currentCalendar]; NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit; NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:self]; return (int)dateComponent.second; } @end （3）设计我们的UI控件
//头文件部分 @interface YHBaseCalendarView : YHBaseView @property(nonatomic,strong)NSDate * currentDate; //标记数组 用于标记特殊日期 这个数组中存放的必须是YHBaseDateModel 对象 @property(nonatomic,strong)NSArray * markArray; @property(nonatomic,weak)id<YHBaseCalendarViewDelegate> delegate; @end //实现部分 @interface YHBaseCalendarView()<UIScrollViewDelegate> { //星期 UIView * _headView; //日历的展示 UIView * _bodyViewL; UIView * _bodyViewM; UIView * _bodyViewR; //滑动功能的支持 UIScrollView * _scrollView; NSDate * _today; YHBaseDateModel * _selectModel; } @end @implementation YHBaseCalendarView -(void)reloadView{ _currentDate = [NSDate date]; _today = [NSDate date]; _selectModel = [[YHBaseDateModel alloc]init]; _selectModel.year = [NSString stringWithFormat:@"%d",[_today getYear]]; _selectModel.month =[NSString stringWithFormat:@"%d",[_today getMonth]]; _selectModel.day = [NSString stringWithFormat:@"%d",[_today getDay]]; _scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 30, self.frame.size.width, self.frame.size.height)]; _scrollView.contentSize = CGSizeMake(3*self.frame.size.width, 0); _scrollView.contentOffset = CGPointMake(self.frame.size.width, 0); _scrollView.pagingEnabled=YES; _scrollView.delegate=self; [self addSubview:_scrollView]; _bodyViewL = [[UIView alloc]initWithFrame:CGRectMake(0, 0, _scrollView.frame.size.width, _scrollView.frame.size.height)]; [_scrollView addSubview:_bodyViewL]; _bodyViewM = [[UIView alloc]initWithFrame:CGRectMake(_scrollView.frame.size.width,0, _scrollView.frame.size.width, _scrollView.frame.size.height)]; [_scrollView addSubview:_bodyViewM]; _bodyViewR = [[UIView alloc]initWithFrame:CGRectMake(_scrollView.frame.size.width*2, 0, _scrollView.frame.size.width, _scrollView.frame.size.height)]; [_scrollView addSubview:_bodyViewR]; //展示星期 _headView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, 30)]; _headView.backgroundColor = [UIColor redColor]; NSArray * weekArray = @[@"SUN",@"MON",@"TUES",@"WED",@"THUR",@"FRI",@"SAT"]; for (int i=0; i<7; i++) { UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(self.frame.size.width/7*i, 0, self.frame.size.width/7, 30)]; if (i!=0&&i!=6) { label.backgroundColor = [UIColor redColor]; }else{ label.backgroundColor = [UIColor purpleColor]; } label.text=weekArray[i]; label.textAlignment = NSTextAlignmentCenter; label.layer.borderWidth=1; label.layer.borderColor = [[UIColor grayColor]CGColor]; label.font = [UIFont boldSystemFontOfSize:16]; label.layer.borderColor=[[UIColor grayColor] CGColor]; label.textColor = [UIColor whiteColor]; label.layer.borderWidth = 1; [_headView addSubview:label]; } [self addSubview:_headView]; [self creatViewWithData:_currentDate onView:_bodyViewM]; [self creatViewWithData:[YHBaseDateTools getPreviousframDate:_currentDate] onView:_bodyViewL]; [self creatViewWithData:[YHBaseDateTools getNextMonthframDate:_currentDate] onView:_bodyViewR]; } //核心的构造方法 -(void)creatViewWithData:(id)data onView:(UIView *)bodyView{ NSDate * currentDate = (NSDate *)data; //获取当前月有多少天 int monthNum = (int)[currentDate YHBaseNumberOfDaysInCurrentMonth]; //获取第一天的日期 NSDate * firstDate = [currentDate YHBaseFirstDayOfCurrentMonth]; //确定这一天是周几 int weekday = [firstDate YHBaseWeekly]; //确定创建多少行 int weekRow=0; int tmp=monthNum; if (weekday!=7) { weekRow++; tmp=monthNum-(7-weekday); } weekRow += tmp/7; weekRow += (tmp%7)?1:0; //开始创建按钮 /** *这里的逻辑是有问题的，应该设计成cell的复用机制，而不应该重复耗性能的创建 有时间在优化 */ #warning 可以优化哦 NSArray * array = [bodyView subviews]; for (UIView * v in array) { [v removeFromSuperview]; } int nextDate = 1; //行 for (int i=0; i<weekRow; i++) { //列 for (int j=0; j<7; j++) { //先进行上个月余天的创建 UIButton * btn; if (weekday!=7&&(i*7+j)<weekday) { //获取上个月有多少天 NSDate * preDate = [YHBaseDateTools getPreviousframDate:currentDate]; int preDays = (int)[preDate YHBaseNumberOfDaysInCurrentMonth]; btn =[[UIButton alloc]initWithFrame:CGRectMake(self.frame.size.width/7*j, self.frame.size.width/7*i, self.frame.size.width/7, self.frame.size.width/7)]; [btn setTitle:[NSString stringWithFormat:@"%d",preDays-weekday+j+1] forState:UIControlStateNormal]; [btn setTitleColor:[UIColor grayColor] forState:UIControlStateNormal]; [bodyView addSubview:btn]; }else if((i*7+j+1-(weekday==7?0:weekday))<=monthNum){ btn =[[UIButton alloc]initWithFrame:CGRectMake(self.frame.size.width/7*j, self.frame.size.width/7*i, self.frame.size.width/7, self.frame.size.width/7)]; [btn setTitle:[NSString stringWithFormat:@"%d",(i*7+j+1-(weekday==7?0:weekday))] forState:UIControlStateNormal]; [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; [bodyView addSubview:btn]; }else{ btn =[[UIButton alloc]initWithFrame:CGRectMake(self.frame.size.width/7*j, self.frame.size.width/7*i, self.frame.size.width/7, self.frame.size.width/7)]; [btn setTitle:[NSString stringWithFormat:@"%d",nextDate++] forState:UIControlStateNormal]; [btn setTitleColor:[UIColor grayColor] forState:UIControlStateNormal]; [bodyView addSubview:btn]; } //将今天的日期标出 if ([currentDate getYear]==[_today getYear]&&[currentDate getMonth]==[_today getMonth]&&[btn.titleLabel.text intValue]==[_today getDay]&&!CGColorEqualToColor([btn.titleLabel.textColor CGColor], [[UIColor grayColor] CGColor])) { [btn setTitleColor:[UIColor redColor] forState:UIControlStateNormal]; } //是否进行自定义标记 /** *if中的颜色比较 是为了让上月与下月的余日不产生bug */ if (_markArray!=nil) { for (int i=0; i<_markArray.count; i++) { YHBaseDateModel * model = _markArray[i]; if ([currentDate getYear]==[model.year intValue]&&[currentDate getMonth]==[model.month intValue]&&[btn.titleLabel.text intValue]==[model.day intValue]&&!CGColorEqualToColor([btn.titleLabel.textColor CGColor], [[UIColor grayColor] CGColor])) { btn.layer.borderColor = [[UIColor grayColor]CGColor]; btn.layer.borderWidth=1; } } } //是否进行选中标记 if ([_selectModel.year intValue]==[currentDate getYear]&&[_selectModel.month intValue]==[currentDate getMonth]&&[_selectModel.day intValue]==[btn.titleLabel.text intValue]&&!CGColorEqualToColor([btn.titleLabel.textColor CGColor], [[UIColor grayColor] CGColor])) { btn.backgroundColor = [UIColor cyanColor]; } if (!CGColorEqualToColor([btn.titleLabel.textColor CGColor], [[UIColor grayColor] CGColor])) { //添加点击事件 [btn addTarget:self action:@selector(clickBtn:) forControlEvents:UIControlEventTouchUpInside]; } } } } //这个方法中进行重构 -(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{ if (scrollView.contentOffset.x==0) {//向前翻页了 _currentDate = [YHBaseDateTools getPreviousframDate:_currentDate]; _scrollView.contentOffset=CGPointMake(scrollView.frame.size.width, 0); [self creatViewWithData:_currentDate onView:_bodyViewM]; [self creatViewWithData:[YHBaseDateTools getPreviousframDate:_currentDate] onView:_bodyViewL]; [self creatViewWithData:[YHBaseDateTools getNextMonthframDate:_currentDate] onView:_bodyViewR]; }else if (scrollView.contentOffset.x==scrollView.frame.size.width){ }else if (scrollView.contentOffset.x==scrollView.frame.size.width*2){ _currentDate = [YHBaseDateTools getNextMonthframDate:_currentDate]; _scrollView.contentOffset=CGPointMake(scrollView.frame.size.width, 0); [self creatViewWithData:_currentDate onView:_bodyViewM]; [self creatViewWithData:[YHBaseDateTools getPreviousframDate:_currentDate] onView:_bodyViewL]; [self creatViewWithData:[YHBaseDateTools getNextMonthframDate:_currentDate] onView:_bodyViewR]; } scrollView.userInteractionEnabled=YES; if ([self.delegate respondsToSelector:@selector(YHBaseCalendarViewScrollEndToDate:)]) { YHBaseDateModel * model = [[YHBaseDateModel alloc]init]; model.year = [NSString stringWithFormat:@"%d",[_currentDate getYear]]; model.month = [NSString stringWithFormat:@"%d",[_currentDate getMonth]]; model.day = [NSString stringWithFormat:@"%d",[_currentDate getDay]]; [self.delegate YHBaseCalendarViewScrollEndToDate:model]; } } -(void)scrollViewDidScroll:(UIScrollView *)scrollView{ scrollView.userInteractionEnabled=NO; } //点击事件 -(void)clickBtn:(UIButton *)btn{ _selectModel.year = [NSString stringWithFormat:@"%d",[_currentDate getYear]]; _selectModel.month = [NSString stringWithFormat:@"%d",[_currentDate getMonth]]; _selectModel.day = btn.titleLabel.text; [self creatViewWithData:_currentDate onView:_bodyViewM]; [self creatViewWithData:[YHBaseDateTools getPreviousframDate:_currentDate] onView:_bodyViewL]; [self creatViewWithData:[YHBaseDateTools getNextMonthframDate:_currentDate] onView:_bodyViewR]; if ([self.delegate respondsToSelector:@selector(YHBaseCalendarViewSelectAtDateModel:)]) { [self.delegate YHBaseCalendarViewSelectAtDateModel:_selectModel]; } } @end （4）为用户交互设计的协议
@protocol YHBaseCalendarViewDelegate<NSObject> -(void)YHBaseCalendarViewSelectAtDateModel:(YHBaseDateModel *)dateModel; -(void)YHBaseCalendarViewScrollEndToDate:(YHBaseDateModel *)dateModel; @end
三、插个小广告
控件的源码在 https://github.com/ZYHshao/YHBaseFoundationTest.git 中，这是我封装的一套基于Cocoa与Foundation的更易用的开发框架，其中也对AFN，CRLabel，SDImage,MJRefresh进行了集成，有易用的下载框架，缓存框架，错误处理框架，皮肤管理框架等，也有支持加载HTML并且异步缓存图片的view，边下边播并做缓存的AVAudioPlayer，以及各种自定义性能很强的view控件，如用block创建的按钮，提示框以及对json和模型做相关映射的处理类，如果这些东西有帮到你，我很开心，如果你发现一些问题或者优化建议，请一定告知我，我将十分感激，QQ316045346
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