判断发表的时间长度
+ (NSString *)prettyDateWithReference:(NSString *)reference {
NSString *suffix = @"之前";
double t = [reference doubleValue];
NSDate *date = [NSDate dateWithTimeIntervalSince1970:t];
float different = [date timeIntervalSinceDate:[NSDate date]];
if (different < 0) {
different = -different;
suffix = @"刚刚";
}
// days = different / (24 * 60 * 60), take the floor value
float dayDifferent = floor(different / 86400);
int days = (int)dayDifferent;
int weeks = (int)ceil(dayDifferent / 7);
int months = (int)ceil(dayDifferent / 30);
int years = (int)ceil(dayDifferent / 365);
// It belongs to today
if (dayDifferent <= 0) {
// lower than 60 seconds
if (different < 60) {
return @"刚刚";
}
// lower than 120 seconds => one minute and lower than 60 seconds
if (different < 120) {
return [NSString stringWithFormat:@"1 分钟 %@", suffix];
}
// lower than 60 minutes
if (different < 660 * 60) {
return [NSString stringWithFormat:@"%d 分钟 %@", (int)floor(different / 60), suffix];
}
// lower than 60 * 2 minutes => one hour and lower than 60 minutes
if (different < 7200) {
return [NSString stringWithFormat:@"1 小时 %@", suffix];
}
// lower than one day
if (different < 86400) {
return [NSString stringWithFormat:@"%d 小时 %@", (int)floor(different / 3600), suffix];
}
}
// lower than one week
else if (days < 7) {
return [NSString stringWithFormat:@"%d 天%@ %@", days, days == 1 ? @"" : @"s", suffix];
}
// lager than one week but lower than a month
else if (weeks < 4) {
return [NSString stringWithFormat:@"%d 周%@ %@", weeks, weeks == 1 ? @"" : @"s", suffix];
}
// lager than a month and lower than a year
else if (months < 12) {
return [NSString stringWithFormat:@"%d 月%@ %@", months, months == 1 ? @"" : @"s", suffix];
}
// lager than a year
else {
return [NSString stringWithFormat:@"%d 年%@ %@", years, years == 1 ? @"" : @"s", suffix];
}
return self.description;
}