如果语句不使用解析

Question

我正在检索一个我知道在解析时为nil的值，在表中检查并使用print语句，并且仍然被if语句忽略。为什么会这样？

class func checkLicense(){
    var compQuery = PFQuery(className:"User")
    var userDefaults = NSUserDefaults.standardUserDefaults()
    var secretKey = userDefaults.stringForKey("secretkey")
    var team = userDefaults.stringForKey("teamID")
    var scout = userDefaults.stringForKey("scoutID")
    var password = userDefaults.stringForKey("password")
    compQuery.whereKey("teamID", equalTo:"1")
    compQuery.whereKey("scoutID", equalTo:"1")
    compQuery.whereKey("password", equalTo:"1234")
    compQuery.findObjectsInBackgroundWithBlock {
        (users: [AnyObject]!, error: NSError!) -> Void in
        if error == nil && users.count >= 1{
            let date = NSDate()
            let calendar = NSCalendar.currentCalendar()
            let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute | .DayCalendarUnit | .CalendarUnitMonth | .CalendarUnitYear, fromDate: date)
            let expiraton = date.dateByAddingTimeInterval(10800)
            let expirecomponents = calendar.components(.CalendarUnitHour | .CalendarUnitMinute | .DayCalendarUnit | .CalendarUnitMonth | .CalendarUnitYear, fromDate: expiraton)
            let hour = components.hour
            let minutes = components.minute
            let month = components.month
            let year = components.year
            let day = components.day
            let exhour = expirecomponents.hour
            let exminutes = expirecomponents.minute
            let exmonth = expirecomponents.month
            let exyear = expirecomponents.year
            let exday = expirecomponents.day
            var query = PFQuery(className:"User")
            for user in users{
                if user["secretkey"] == nil {
                    query.getObjectInBackgroundWithId(user.objectId) {
                        (newData: PFObject!, error: NSError!) -> Void in
                        if error != nil {
                            NSLog("%@", error)
                        } else {
                            newData["secretkey"] = "\(secretKey!)"
                            newData["keyDate"] = "\(month)/\(day)/\(year) \(hour):\(minutes)"
                            newData["keyExpireDate"] = "\(exmonth)/\(exday)/\(exyear) \(exhour):\(exminutes)"
                            newData.save()
                            println("License Agent Completed License Data Refresh")
                        }
                    }
                }
            }
        }
    }
}

问题是由行

引起的

if user["secretkey"] == nil {