/**
和当前时间进行比较 输出字符串为（刚刚几个小时前 几天前 ）
最好要传入的时间格式 2017-06-14 14:18:54
@param timeStr 输入时间
@param format 时间格式，默认为yyyy-MM-dd HH:mm:ss
@return 输出字符串为（刚刚几个小时前 几天前 ）
*/
+(NSString *)inputTimeStr:(NSString *)timeStr withFormat:(NSString *)format
{
NSDate *nowDate = [NSDate date];
NSDate *sinceDate = [self becomeDateStr:timeStr withFormat:format];
int i = [nowDate timeIntervalSinceDate:sinceDate];
NSString *str = @"";
if (i <= 60)
{//小于60s
str = @"刚刚";
}else if(i>60 && i<=3600)
{//大于60s，小于一小时
str = [NSString stringWithFormat:@"%d分钟前",i/60];
}else if (i>3600 && i<60*60*24)
{//
if ([self isYesterdayWithDate:sinceDate])
{//24小时内可能是昨天
str = [NSString stringWithFormat:@"昨天"];
}else
{//今天
str = [NSString stringWithFormat:@"%d小时前",i/3600];
}
}else
{//
int k = i/(3600*24);
if ([self isYesterdayWithDate:sinceDate])
{//大于24小时也可能是昨天
str = [NSString stringWithFormat:@"昨天"];
}else
{
//在这里大于1天的我们可以以周几的形式显示
if (k>=1)
{
if (k < [self getNowDateWeek])
{//本周
str = [self weekdayStringFromDate:[self becomeDateStr:timeStr withFormat:format]];
}else
{//不是本周
// str = [NSString stringWithFormat:@"不是本周%@",[self weekdayStringFromDate:[self becomeDateStr:timeStr]]];
str = timeStr;
}
}else
{//
str = [NSString stringWithFormat:@"%d天前",i/(3600*24)];
}
}
}
return str;
}
//把时间字符串转换成NSDate
+ (NSDate *)becomeDateStr:(NSString *)dateStr withFormat:(NSString *)format
{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
if (format) {
[dateFormatter setDateFormat:format];
}else{
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
}
NSDate *date1 = [dateFormatter dateFromString:dateStr];
return date1;
}
//把时间转换成星期
+ (NSString*)weekdayStringFromDate:(NSDate*)inputDate {
NSArray *weekdays = [NSArray arrayWithObjects: [NSNull null], @"周日", @"周一", @"周二", @"周三", @"周四", @"周五", @"周六", nil];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
// NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"Asia/Shanghai"];
NSTimeZone *timeZone = [[NSTimeZone alloc] initWithName:@"zh-Hans"];
[calendar setTimeZone: timeZone];
NSCalendarUnit calendarUnit = NSCalendarUnitWeekday;
NSDateComponents *theComponents = [calendar components:calendarUnit fromDate:inputDate];
return [weekdays objectAtIndex:theComponents.weekday];
}
//判断是否为昨天
+ (BOOL)isYesterdayWithDate:(NSDate *)newDate
{
BOOL isYesterday = YES;
NSTimeInterval secondsPerDay = 24 * 60 * 60;
//
NSDate *yearsterDay = [[NSDate alloc] initWithTimeIntervalSinceNow:-secondsPerDay];
/** 前天判断
// NSDate *qianToday = [[NSDate alloc] initWithTimeIntervalSinceNow:-2*secondsPerDay];
// NSDateComponents* comp3 = [calendar components:unitFlags fromDate:qianToday];
// if (comp1.year == comp3.year && comp1.month == comp3.month && comp1.day == comp3.day)
// {
// dateContent = @"前天";
// }
**/
NSCalendar* calendar = [NSCalendar currentCalendar];
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay;
// unsigned unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
NSDateComponents* comp1 = [calendar components:unitFlags fromDate:newDate];
NSDateComponents* comp2 = [calendar components:unitFlags fromDate:yearsterDay];
if ( comp1.year == comp2.year && comp1.month == comp2.month && comp1.day == comp2.day)
{
isYesterday = YES;
}else
{
isYesterday = NO;
}
return isYesterday;
}
//判断今天是本周的第几天
+ (int)getNowDateWeek
{
NSDate *nowDate = [NSDate date];
NSString *nowWeekStr = [self weekdayStringFromDate:nowDate];
int factWeekDay = 0;
if ([nowWeekStr isEqualToString:@"周日"])
{
factWeekDay = 7;
}else if ([nowWeekStr isEqualToString:@"周一"])
{
factWeekDay = 1;
}else if ([nowWeekStr isEqualToString:@"周二"])
{
factWeekDay = 2;
}else if ([nowWeekStr isEqualToString:@"周三"])
{
factWeekDay = 3;
}else if ([nowWeekStr isEqualToString:@"周四"])
{
factWeekDay = 4;
}else if ([nowWeekStr isEqualToString:@"周五"])
{
factWeekDay = 5;
}else if ([nowWeekStr isEqualToString:@"周六"])
{
factWeekDay = 6;
}
return factWeekDay;
}
```
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