iOS：日期轉為xx之前

iOS：日期轉為xx之前

//日期轉xx前@interface NSString(date)+ (NSString *)dateString:(NSString *)dateStr;@end@implementation NSString (date)+ (NSString *)dateString:(NSString *)dateStr{    NSDate *date = [NSDate dateFromString:dateStr withFormat:@"yyyy-MM-dd HH:mm:ss"];    if (!date) {        return @"";    }    int minites = [[NSDate date] timeIntervalSinceDate:date]/60;    if (minites < 0) {        return @"";    }    if (minites < 60) {//不到一小時        return [NSString stringWithFormat:@"%d分鐘前",minites];    }    else if(minites < 60 * 24)//不到一天    {        return [NSString stringWithFormat:@"%d小時前",minites / 60];    }    else if(minites < 60 * 24 * 3)//不大於三天    {        return [NSString stringWithFormat:@"%d天前",minites / 60 / 24];    }    //可以根據自己需要再添加幾個月前，甚至幾年前    return [date stringWithFormat:@"MM-dd”];//返回一個xx月xx日}@end