iOS根據日期判斷是剛剛、幾分鐘前、幾小時前等的代碼片段

嘆落花 2015-04-01

展開全文

參考github源碼中的一個格式化字符串的源碼,

是NSDate的一個擴展方法:

[objc] view plain copy print ?

/**
* Given the reference date and return a pretty date string to show
*
* @param refrence the date to refrence
*
* @return a pretty date string, like "just now", "1 minute ago", "2 weeks ago", etc
*/
- (NSString *)prettyDateWithReference:(NSDate *)reference {
NSString *suffix = @"ago";
float different = [reference timeIntervalSinceDate:self];
if (different < 0) {
different = -different;
suffix = @"from now";
}
// 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 @"just now";
}
// lower than 120 seconds => one minute and lower than 60 seconds
if (different < 120) {
return [NSString stringWithFormat:@"1 minute %@", suffix];
}
// lower than 60 minutes
if (different < 660 * 60) {
return [NSString stringWithFormat:@"%d minutes %@", (int)floor(different / 60), suffix];
}
// lower than 60 * 2 minutes => one hour and lower than 60 minutes
if (different < 7200) {
return [NSString stringWithFormat:@"1 hour %@", suffix];
}
// lower than one day
if (different < 86400) {
return [NSString stringWithFormat:@"%d hours %@", (int)floor(different / 3600), suffix];
}
}
// lower than one week
else if (days < 7) {
return [NSString stringWithFormat:@"%d day%@ %@", days, days == 1 ? @"" : @"s", suffix];
}
// lager than one week but lower than a month
else if (weeks < 4) {
return [NSString stringWithFormat:@"%d week%@ %@", weeks, weeks == 1 ? @"" : @"s", suffix];
}
// lager than a month and lower than a year
else if (months < 12) {
return [NSString stringWithFormat:@"%d month%@ %@", months, months == 1 ? @"" : @"s", suffix];
}
// lager than a year
else {
return [NSString stringWithFormat:@"%d year%@ %@", years, years == 1 ? @"" : @"s", suffix];
}
return self.description;
}