iOS剩余时间的计算 与 显示 返回的数据是截止时间,,我们改成剩余时间

-(NSString *)getUTCFormateDate:(NSString *)newsDate  //newsDate服务器得到的时间

{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];
   
   
    NSDate *newsDateFormatted = [dateFormatter dateFromString:newsDate];
    NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
    [dateFormatter setTimeZone:timeZone];
   
    NSDate* current_date = [[NSDate alloc] init];
   
    NSTimeInterval time=[newsDateFormatted timeIntervalSinceDate:current_date];//间隔的秒数
    int days=((int)time)/(3600*24);
    int hours=((int)time)%(3600*24)/3600;
    int minute=((int)time)%(3600*24)%60;
   
    NSString *dateContent;
    if(days>0){
        dateContent=[[NSString alloc] initWithFormat:@"剩余%i天%i小时%i分钟",days,hours,minute];
    }
    else if(hours>0){
        dateContent=[[NSString alloc] initWithFormat:@"剩余%i小时%i分钟",hours,minute];
    }
    else{
        dateContent=[[NSString alloc] initWithFormat:@"剩余%i分钟",minute];
    }
   
    if (time<=0) {
        dateContent=@"";
    }
    return dateContent;

}