别的大神写的控件根据自己项目的需求进行改进
只需要以下代码就可以创建控件，并实现选择回调：
_calendarView = [[FyCalendarView alloc] initWithFrame:CGRectMake(0,64, self.view.frame.size.width,self.view.width 60)];
//日期状态
[self.view addSubview:_calendarView];
_calendarView.date = [NSDate date];
__weak typeof(self)weakSelf=self;
_calendarView.calendarBlock = ^(NSInteger day, NSInteger month, NSInteger year){
NSString *dateString=[NSString stringWithFormat:@"%lu-%lu-%lu",year,month,day];
};
self.calendarView.nextMonthBlock = ^(){
[weakSelf setupNextMonth];
};
self.calendarView.lastMonthBlock = ^(){
[weakSelf setupLastMonth];
};
self.calendarView.lastYearBlock=^(){
[weakSelf setupLastYear];
};
self.calendarView.nextYearBlock=^(){
[weakSelf setupNextYear];
};
