由于项目需要,整理出来以供大家参考,请各位大神指教,多谢
方法一:NSCalendar 自带方法判断是否是昨天、今天、明天
+ (NSString *)dateStrToStrWithDateStr:(NSString *)dateStr {
NSString *flagString = @"";
// 目标日期
NSDate *tarDate = [self getDateFromDateStr:dateStr];
if ([[NSCalendar currentCalendar] isDateInYesterday:tarDate]) {
flagString = @"昨天";
}else if ([[NSCalendar currentCalendar] isDateInToday:tarDate]) {
flagString = @"今天";
}else if ([[NSCalendar currentCalendar] isDateInTomorrow:tarDate]) {
flagString = @"明天";
}
return flagString;
}
方法二:只适用于判断同一个月份的昨天、今天、明天、后天
+ (NSString *)dateStrToStrWithNowDateStr:(NSString *)nowDateStr dateStr:(NSString *)dateStr {
NSString *flagString = @"";
// 当前日期
int currentDateInt = [self getIntegerFromDateStr:nowDateStr];
// 目标日期
int tarInt = [self getIntegerFromDateStr:dateStr];
// 时间差
int diff = tarInt - currentDateInt;
if ( diff < 3 && diff >= 0) {
switch (diff) {
case 0:
flagString = @"今天";
break;
case 1:
flagString = @"明天";
break;
case 2:
flagString = @"后天";
break;
default:
break;
}
}else if (diff == -1) {
flagString = @"昨天";
}
return flagString;
}
方法三:获取到当前日期的昨天、今天、明天、后天。。。来跟目标日期进行判断,适用于同一个月份和不同月份
+ (NSString *)dateStrToStrWithNowDateStr:(NSString *)nowDateStr dateStr:(NSString *)dateStr {
NSString *flagString = @"";
///
if ([dateStr isEqualToString:[self getTheDayAfterDay:nowDateStr addDay:-1]]) {
flagString = @"昨天";
}else if ([dateStr isEqualToString:[self getTheDayAfterDay:nowDateStr addDay:0]]) {
flagString = @"今天";
}else if ([dateStr isEqualToString:[self getTheDayAfterDay:nowDateStr addDay:1]]) {
flagString = @"明天";
}else if ([dateStr isEqualToString:[self getTheDayAfterDay:nowDateStr addDay:2]]) {
flagString = @"后天";
}
return flagString;
}
+ (NSString *)getTheDayAfterDay:(NSString *)theDayStr addDay:(int)addDay {
NSDateFormatter *format = [[NSDateFormatter alloc]init];
[format setDateFormat:@"yyyy-MM-dd"];
NSDate *theDay = [format dateFromString:theDayStr];
NSCalendar *cal = [NSCalendar currentCalendar];
unsigned int time = NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay;
NSDateComponents *t = [cal components:time fromDate:theDay];
int year = (int)[t year];
int month = (int)[t month];
int day = (int)[t day];
day = day + (addDay);
int monthDays = [self daysCountOfMonth:month andYear:year];
if (day > monthDays) {
month += 1;
day = day - monthDays;
}else {
///不做任何处理
}
NSString *resultStr = [NSString stringWithFormat:@"%02d-%02d-%02d",year,month,day];
return resultStr;
}
+ (int)daysCountOfMonth:(NSInteger)month andYear:(NSInteger)year {
if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
return 31;
}else if (month == 4 || month == 6 || month == 9 || month == 11) {
return 30;
}
if((year%4 != 0) || (year%100 == 0 && year%400 != 0)) {
return 28;
}
return 29;
}
方法四:综合上述所有方法的判断
+ (NSString *)dateStrToStrWithNowDateStr:(NSString *)nowDateStr dateStr:(NSString *)dateStr {
NSString *flagString = @"";
// 当前日期
int currentDateInt = [self getIntegerFromDateStr:nowDateStr];
// 目标日期
int tarInt = [self getIntegerFromDateStr:dateStr];
NSDate *tarDate = [self getDateFromDateStr:dateStr];
// 时间差
int diff = tarInt - currentDateInt;
if ( diff < 3 && diff >= 0) {
switch (diff) {
case 0:
flagString = @"今天";
break;
case 1:
flagString = @"明天";
break;
case 2:
flagString = @"后天";
break;
default:
break;
}
}else if (diff == -1) {
flagString = @"昨天";
}else {
if ([[NSCalendar currentCalendar] isDateInYesterday:tarDate]) {
flagString = @"昨天";
}else if ([[NSCalendar currentCalendar] isDateInToday:tarDate]) {
flagString = @"今天";
}else if ([[NSCalendar currentCalendar] isDateInTomorrow:tarDate]) {
flagString = @"明天";
}else if ([dateStr isEqualToString:[self getTheDayAfterDay:nowDateStr addDay:2]]) {
flagString = @"后天";
}
}
return flagString;
}
其中公共方法如下:
+ (NSDate *)getDateFromDateStr:(NSString *)dateStr {
NSDateFormatter *format = [[NSDateFormatter alloc]init];
[format setDateFormat:@"yyyy-MM-dd"];
NSDate *date = [format dateFromString:dateStr];
return date;
}
+ (int)getIntegerFromDateStr:(NSString *)dateStr {
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"yyyy-MM-dd"];
NSDate *date = [formatter dateFromString:dateStr];
NSDateFormatter *formatter1 = [[NSDateFormatter alloc]init];
[formatter1 setDateFormat:@"yyyyMMdd"];
NSString *todayStr = [formatter1 stringFromDate:date];
int presentDay = [todayStr intValue];
return presentDay;
}