继上篇文章 时间和时间戳转换 之后、我又把关于NSDate的一些大家在项目中可能会用到的内容进行了整理。现在分享一下供大家参考。
其实呢、我是把这些内容写了一个NSDate的分类、大家也可以使用这样的方式来让自己的代码更加简洁高效。
直接看代码吧：总有一条是你能用到的。
#import <Foundation/Foundation.h>
@interface NSDate (YJExtension)
// 获取给定日期对应的是星期几
- (NSString *)currentWeekDayByDate:(NSDate *)date format:(NSString *)format;
// 获取给定字符串对应的日期是星期几
- (NSString *)currentWeekDayByString:(NSString *)string format:(NSString *)format;
// 获取给定日期所在周的日期范围
- (NSString *)currentWeekTimeRangeByDate:(NSDate *)date;
// 根据给定日期计算明天日期---返回NSDate类型
- (NSDate *)tomorrowDateByDate:(NSDate *)date;
// 根据给定日期计算明天日期---返回字符串类型
- (NSString *)tomorrowStringByDate:(NSDate *)date format:(NSString *)format;
// 根据日期返回对应的是哪个星座
- (NSString *)currentConstellationByDate:(NSDate *)date;
@end
1、获取星期几
- (NSString *)currentWeekDayByDate:(NSDate *)date format:(NSString *)format
{
NSDateFormatter *fm = [[NSDateFormatter alloc] init];
[fm setDateFormat:format];
NSArray *array = [NSArray arrayWithObjects:@"",@"星期日",@"星期一",
@"星期二",@"星期三",@"星期四",@"星期五",@"星期六", nil];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSCalendarUnit calendarUnit = NSCalendarUnitWeekday;
NSDateComponents *theComponents = [calendar components:calendarUnit fromDate:date];
return array[theComponents.weekday];
}
- (NSString *)currentWeekDayByString:(NSString *)string format:(NSString *)format
{
NSDateFormatter *fm = [[NSDateFormatter alloc] init];
[fm setDateFormat:format];
NSDate *date = [fm dateFromString:string];
return [self currentWeekDayByDate:date format:format];
}
2、获取本周的日期范围
- (NSString *)currentWeekTimeRangeByDate:(NSDate *)date
{
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comp = [calendar components:NSCalendarUnitWeekday | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:date];
[comp setDay:([comp day] + 1)];
NSDateFormatter *fm = [[NSDateFormatter alloc] init];
[fm setDateFormat:@"yyyy.MM.dd"];
NSInteger weekDay = [comp weekday];
NSInteger day = [comp day];
long firstDiff,lastDiff;
if (weekDay == 1) {
firstDiff = 1;
lastDiff = 0;
}else{
firstDiff = [calendar firstWeekday] - weekDay;
lastDiff = 7 - weekDay;
}
NSDateComponents *dayComp = [calendar components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:date];
[dayComp setDay:day + firstDiff];
NSDate *firstDayOfWeek = [calendar dateFromComponents:dayComp];
[dayComp setDay:day + lastDiff];
NSDate *lastDayOfWeek = [calendar dateFromComponents:dayComp];
return [NSString stringWithFormat:@"%@-%@",[fm stringFromDate:firstDayOfWeek],[fm stringFromDate:lastDayOfWeek]];
}
3、获取明天日期
- (NSDate *)tomorrowDateByDate:(NSDate *)date
{
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *components = [gregorian components:NSCalendarUnitWeekday | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:date];
[components setDay:([components day] + 1)];
return [gregorian dateFromComponents:components];
}
- (NSString *)tomorrowStringByDate:(NSDate *)date format:(NSString *)format
{
NSDateFormatter *fm = [[NSDateFormatter alloc] init];
[fm setDateFormat:format];
return [fm stringFromDate:[self tomorrowDateByDate:date]];
}
4、获取当前日期对应的星座
- (NSString *)currentConstellationByDate:(NSDate *)date
{
NSString *retStr = @"";
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"MM"];
int i_month = 0;
NSString *theMonth = [dateFormat stringFromDate:date];
if([[theMonth substringToIndex:0] isEqualToString:@"0"]){
i_month = [[theMonth substringFromIndex:1] intValue];
}else{
i_month = [theMonth intValue];
}
[dateFormat setDateFormat:@"dd"];
int i_day = 0;
NSString *theDay = [dateFormat stringFromDate:date];
if([[theDay substringToIndex:0] isEqualToString:@"0"]){
i_day = [[theDay substringFromIndex:1] intValue];
}else{
i_day = [theDay intValue];
}
switch (i_month) {
case 1:
if(i_day >= 1 && i_day <= 19){
retStr = @"摩羯座";
}
if(i_day >= 20 && i_day <= 31){
retStr = @"水瓶座";
}
break;
case 2:
if(i_day >= 1 && i_day <= 18){
retStr = @"水瓶座";
}
if(i_day >= 19 && i_day <= 31){
retStr = @"双鱼座";
}
break;
case 3:
if(i_day >= 1 && i_day <= 20){
retStr = @"双鱼座";
}
if(i_day >= 21 && i_day <= 31){
retStr = @"白羊座";
}
break;
case 4:
if(i_day >= 1 && i_day <= 19){
retStr = @"白羊座";
}
if(i_day >= 20 && i_day <= 31){
retStr = @"金牛座";
}
break;
case 5:
if(i_day >= 1 && i_day <= 20){
retStr = @"金牛座";
}
if(i_day >= 21 && i_day <= 31){
retStr = @"双子座";
}
break;
case 6:
if(i_day >= 1 && i_day <= 21){
retStr = @"双子座";
}
if(i_day >= 22 && i_day <= 31){
retStr = @"巨蟹座";
}
break;
case 7:
if(i_day >= 1 && i_day <= 22){
retStr = @"巨蟹座";
}
if(i_day >= 23 && i_day <= 31){
retStr = @"狮子座";
}
break;
case 8:
if(i_day >= 1 && i_day <= 22){
retStr = @"狮子座";
}
if(i_day >= 23 && i_day <= 31){
retStr = @"处女座";
}
break;
case 9:
if(i_day >= 1 && i_day <= 22){
retStr = @"处女座";
}
if(i_day >= 23 && i_day <= 31){
retStr = @"天秤座";
}
break;
case 10:
if(i_day >= 1 && i_day <= 23){
retStr = @"天秤座";
}
if(i_day >= 24 && i_day <= 31){
retStr = @"天蝎座";
}
break;
case 11:
if(i_day >= 1 && i_day <= 22){
retStr = @"天蝎座";
}
if(i_day >= 23 && i_day <= 31){
retStr = @"射手座";
}
break;
case 12:
if(i_day >= 1 && i_day <= 21){
retStr = @"射手座";
}
if(i_day >= 21 && i_day <= 31){
retStr = @"摩羯座";
}
break;
}
return retStr;
}
以上就是本文要分享的内容了、希望可以对大家有所帮助。蟹蟹~~~
