iOS 时间对比，判断几分钟前、几小时前、昨天、本周几

本文链接：https://blog.youkuaiyun.com/XWS1990/article/details/79723770

这个博客介绍了一个iOS方法，用于将输入的时间字符串与当前时间对比，以输出‘几分钟前’、‘几小时前’、‘昨天’或‘本周几’等描述。它涉及NSDate的使用，包括时间戳计算、日期转换以及判断是否为昨天和本周的逻辑。

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* 需要传入的时间格式 2017-06-14 14:18:54

// 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）

+(NSString *)inputTimeStr:(NSString *)timeStr

{

NSDate *nowDate = [NSDate date];

NSDate *sinceDate = [self becomeDateStr:timeStr];

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]];

}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

{

NSDateFormatter *formatter2 = [[NSDateFormatter alloc]init];

[formatter2 setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *date1 = [formatter2 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;

}