小兵项目中用到日历签到功能，之前写过相关的Demo，从新整理一遍，温故而知新，重新整理了份相关知识点
.h文件方法函数
@interface XFCalendarTool : NSObject
+ (NSInteger)day:(NSDate *)date;
+ (NSInteger)month:(NSDate *)date;
+ (NSInteger)year:(NSDate *)date;
+ (NSInteger)firstWeekdayInThisMonth:(NSDate *)date;
+ (NSInteger)totaldaysInMonth:(NSDate *)date;
+ (NSDate *)lastMonth:(NSDate *)date;
+ (NSDate*)nextMonth:(NSDate *)date;
@implementation XFCalendarTool
/**
@param date 当前 几号
@return <#return value description#>
*/
+ (NSInteger)day:(NSDate *)date{
NSDateComponents *components = [[NSCalendar currentCalendar] components:(NSCalendarUnitDay) fromDate:date];
return [components day];
}
/**
当前 月
@param date <#date description#>
@return <#return value description#>
*/
+ (NSInteger)month:(NSDate *)date{
NSDateComponents *components = [[NSCalendar currentCalendar] components:(NSCalendarUnitMonth) fromDate:date];
return [components month];
}
/**
当前 年
@param date <#date description#>
@return <#return value description#>
*/
+ (NSInteger)year:(NSDate *)date{
NSDateComponents *components = [[NSCalendar currentCalendar] components:(NSCalendarUnitYear) fromDate:date];
return [components year];
}
/**
当前时间 当前月 1号 是 weak
@param date <#date description#>
@return <#return value description#>
*/
+ (NSInteger)firstWeekdayInThisMonth:(NSDate *)date{
NSCalendar *calendar = [NSCalendar currentCalendar];
[calendar setFirstWeekday:1];
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];
return firstWeekday - 1;
}
/**
当前月 天数
@param date 31-
@return <#return value description#>
*/
+ (NSInteger)totaldaysInMonth:(NSDate *)date{
NSRange daysInOfMonth = [[NSCalendar currentCalendar] rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:date];
return daysInOfMonth.length;
}
/**
上个月
@param date 2017-02-28 14:29:50 +0000--
@return <#return value description#>
*/
+ (NSDate *)lastMonth:(NSDate *)date{
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
dateComponents.month = -1;
NSDate *newDate = [[NSCalendar currentCalendar] dateByAddingComponents:dateComponents toDate:date options:0];
return newDate;
}
/**
下个月
@param date 2017-04-29 14:29:50 +0000--
@return <#return value description#>
*/
+ (NSDate*)nextMonth:(NSDate *)date{
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
dateComponents.month = +1;
NSDate *newDate = [[NSCalendar currentCalendar] dateByAddingComponents:dateComponents toDate:date options:0];
return newDate;
}
