iPhone：将日期字符串转换为相对时间戳

问题描述

我有一个如下字符串的时间戳：

，我想将其转换为相对时间戳，例如'20分钟前'或'3天前'。

使用Objective-C for iPhone的最好方法是什么？

解决方案

pre> - （NSString *）dateDiff：（NSString *）origDate {
NSDateFormatter * df = [[NSDateFormatter alloc] init];
[df setFormatterBehavior：NSDateFormatterBehavior10_4];
[df setDateFormat：@EEE，dd MMM yy HH：mm：ss VVVV];
NSDate * convertedDate = [df dateFromString：origDate];
[df release];
NSDate * todayDate = [NSDate date];
double ti = [convertedDate timeIntervalSinceDate：todayDate];
ti = ti * -1;
if（ti< 1）{
return @never;
} else if（ti return @less than a minute ago;
} else if（ti int diff = round（ti / 60）;
return [NSString stringWithFormat：@％d minutes ago，diff];
} else if（ti int diff = round（ti / 60/60）;
return [NSString stringWithFormat：@％d hours ago，diff];
} else if（ti int diff = round（ti / 60/60/24）;
return [NSString stringWithFormat：@％d days ago，diff];
} else {
return @never;
}
}


I've got a timestamp as a string like:

and I'd like to convert it to a relative time stamp like '20 minutes ago' or '3 days ago'.

What's the best way to do this using Objective-C for the iPhone?

解决方案

-(NSString *)dateDiff:(NSString *)origDate {
    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    [df setFormatterBehavior:NSDateFormatterBehavior10_4];
    [df setDateFormat:@"EEE, dd MMM yy HH:mm:ss VVVV"];
    NSDate *convertedDate = [df dateFromString:origDate];
    [df release];
    NSDate *todayDate = [NSDate date];
    double ti = [convertedDate timeIntervalSinceDate:todayDate];
    ti = ti * -1;
    if(ti < 1) {
        return @"never";
    } else  if (ti < 60) {
        return @"less than a minute ago";
    } else if (ti < 3600) {
        int diff = round(ti / 60);
        return [NSString stringWithFormat:@"%d minutes ago", diff];
    } else if (ti < 86400) {
        int diff = round(ti / 60 / 60);
        return[NSString stringWithFormat:@"%d hours ago", diff];
    } else if (ti < 2629743) {
        int diff = round(ti / 60 / 60 / 24);
        return[NSString stringWithFormat:@"%d days ago", diff];
    } else {
        return @"never";
    }   
}

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