ios 时间戳转换成时间

NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
formatter.timeZone = [NSTimeZone timeZoneWithName:@"shanghai"];
[formatter setDateStyle:NSDateFormatterMediumStyle];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

NSDate* date = [NSDate dateWithTimeIntervalSince1970: [[self.dataDict objectForKey:@"create_time"] integerValue]];

NSString* dateString = [formatter stringFromDate:date];

cell.timeLabel.text = dateString;