-(NSString *)returnIntegralStringData:(NSArray *)activityArr{
        //开始时间
        NSTimeInterval time1= [activityArr[index][@"apr_stime"] doubleValue];
        NSDate *startDate=[NSDate dateWithTimeIntervalSince1970:time1];
       //结束时间
        NSTimeInterval time2= [activityArr[index][@"apr_etime"] doubleValue];
        NSDate *endDate=[NSDate dateWithTimeIntervalSince1970:time2];
        
        //比较时间
        if ([startDate timeIntervalSinceNow]>0.0f) {
            return @"即将开抢";
        }else if ([endDate timeIntervalSinceNow]>0.0f){
            return @"抢购中";
        }else{
            return @"已过抢购时间";
        }
    
    return nil;
}