NSDate,NSCalendar,制作日历简单实用的方法
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以下内容转自 http://www.0531s.com/content-39-1040313-1.html
//1. self代表的是调用方法的时间NSDate类型.这是在NSDate的类目中增加的方法
//获取当前的年
-(int)year {
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorian components:NSCalendarUnitYear fromDate:self];
return [components year];
}
//获取当前的月
-(int)month {
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorian components:NSCalendarUnitMonth fromDate:self];
return [components month];
}
//获取当前的日
-(int)day {
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorian components:NSCalendarUnitDay fromDate:self];
return [components day];
}
//获取当前月有多少天
- (NSUInteger)numberOfDaysInCurrentMonth
{
// 频繁调用 [NSCalendar currentCalendar] 可能存在性能问题
return [[NSCalendar currentCalendar] rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonthforDate:self].length;
}
//获得一月的第一天为星期几
-(int)firstWeekDayInMonth {
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
[gregorian setFirstWeekday:1];
//[gregorian setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"nl_NL"]];
//Set date to first of month
NSDateComponents *comps = [gregorian components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:self];
[comps setDay:1];
NSDate *newDate = [gregorian dateFromComponents:comps];
return (8 - [gregorian ordinalityOfUnit:NSCalendarUnitWeekday inUnit:NSCalendarUnitWeekOfMonthforDate:newDate]);
}
//减去第一周的天数,剩余天数除以7,得到倍数和余数, 获得一个月有几周
- (NSUInteger)numberOfWeeksInCurrentMonth
{
NSUInteger weeks = 0;
NSUInteger weekday = [self firstWeekDayInMonth];
if (weekday > 0) {
weeks += 1;
}
NSUInteger monthDays = [self numberOfDaysInCurrentMonth];
weeks = weeks + (monthDays - weekday)/7;
if ((monthDays - weekday) %7 > 0) {
weeks += 1;
}
return weeks;
}
//2.在调用方法的类中写方法
//上一个月的日期
- (NSDate *)lastMonthDate:(NSDate *)date
{
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSCalendarUnitWeekday | NSCalendarUnitMonth |NSCalendarUnitYear | NSCalendarUnitDay) fromDate:date];
if ([components month] == 1) {
[components setMonth:12];
[components setYear:[components year] - 1];
} else {
[components setMonth:[components month] - 1];
}
NSDate *lastMonth = [calendar dateFromComponents:components];
return lastMonth;
}
//下一个月的日期
- (NSDate *)nextMonthDate:(NSDate *)date
{
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSCalendarUnitWeekday|NSCalendarUnitMonth |NSCalendarUnitYear | NSCalendarUnitDay) fromDate:date];
if ([components month] == 12) {
[components setMonth:1];
[components setYear:[components year] + 1];
} else {
[components setMonth:[components month] + 1];
}
NSDate *lastMonth = [calendar dateFromComponents:components];
return lastMonth;
}
同上可以得到上一年,上一天等等时间
//获取当前的年
-(int)year {
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorian components:NSCalendarUnitYear fromDate:self];
return [components year];
}
//获取当前的月
-(int)month {
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorian components:NSCalendarUnitMonth fromDate:self];
return [components month];
}
//获取当前的日
-(int)day {
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorian components:NSCalendarUnitDay fromDate:self];
return [components day];
}
//获取当前月有多少天
- (NSUInteger)numberOfDaysInCurrentMonth
{
// 频繁调用 [NSCalendar currentCalendar] 可能存在性能问题
return [[NSCalendar currentCalendar] rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonthforDate:self].length;
}
//获得一月的第一天为星期几
-(int)firstWeekDayInMonth {
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
[gregorian setFirstWeekday:1];
//[gregorian setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"nl_NL"]];
//Set date to first of month
NSDateComponents *comps = [gregorian components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:self];
[comps setDay:1];
NSDate *newDate = [gregorian dateFromComponents:comps];
return (8 - [gregorian ordinalityOfUnit:NSCalendarUnitWeekday inUnit:NSCalendarUnitWeekOfMonthforDate:newDate]);
}
//减去第一周的天数,剩余天数除以7,得到倍数和余数, 获得一个月有几周
- (NSUInteger)numberOfWeeksInCurrentMonth
{
NSUInteger weeks = 0;
NSUInteger weekday = [self firstWeekDayInMonth];
if (weekday > 0) {
weeks += 1;
}
NSUInteger monthDays = [self numberOfDaysInCurrentMonth];
weeks = weeks + (monthDays - weekday)/7;
if ((monthDays - weekday) %7 > 0) {
weeks += 1;
}
return weeks;
}
//2.在调用方法的类中写方法
//上一个月的日期
- (NSDate *)lastMonthDate:(NSDate *)date
{
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSCalendarUnitWeekday | NSCalendarUnitMonth |NSCalendarUnitYear | NSCalendarUnitDay) fromDate:date];
if ([components month] == 1) {
[components setMonth:12];
[components setYear:[components year] - 1];
} else {
[components setMonth:[components month] - 1];
}
NSDate *lastMonth = [calendar dateFromComponents:components];
return lastMonth;
}
//下一个月的日期
- (NSDate *)nextMonthDate:(NSDate *)date
{
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *components = [calendar components:(NSCalendarUnitWeekday|NSCalendarUnitMonth |NSCalendarUnitYear | NSCalendarUnitDay) fromDate:date];
if ([components month] == 12) {
[components setMonth:1];
[components setYear:[components year] + 1];
} else {
[components setMonth:[components month] + 1];
}
NSDate *lastMonth = [calendar dateFromComponents:components];
return lastMonth;
}
同上可以得到上一年,上一天等等时间
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