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)iddelegate;@end//实现部分@interface YHBaseCalendarView() { //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
（4）为用户交互设计的协议
@protocol YHBaseCalendarViewDelegate-(void)YHBaseCalendarViewSelectAtDateModel:(YHBaseDateModel *)dateModel;-(void)YHBaseCalendarViewScrollEndToDate:(YHBaseDateModel *)dateModel;@end
三、插个小广告
控件的源码在中，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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