从未使用变量'variableName'的初始化;考虑将赋值替换为'_'或删除它

Question

我的应用中只剩下几个警告消息。我借用了一些代码，这恰好是带有警告信息的区域。应用程序运行良好，没有问题，但我想找出为什么那些警告消息存在。

两个单独的swift文件中出现相同的警告消息，因为它们使用类似的代码。

WriteViewController.swift

从未使用变量'memoNum'的初始化;考虑将赋值替换为'_'或删除它 变量'i'的初始化从未使用过;考虑将作业替换为'_'或将其删除

@IBAction func save(){

    /*----------------------------------------*/
    var memoNum = memo.count  // <—- error 
    var i: Int = 0            // <—- error 

    print(memo)

    let id:AnyObject = convertUnixTimeFromDate(NSDate())
    let newDic = ["id":id,"contents":writeView.text]

    print("newDic=\(newDic)¥¥¥")
    print(memo)
    print(memoArray)

    let memoDictionary = ["id":id,"contents":writeView.text]


    var tempArr : Array = memoArray as Array
    print("beforeReverse=\(tempArr)")
    var tempArr2 = Array(tempArr.reverse()) 
    print("afterReverse=\(tempArr2)")
    var tArray : NSArray = tempArr2 as NSArray
    memoArray = tArray.mutableCopy() as! NSMutableArray

    memoArray.addObject(memoDictionary)

    tempArr  = memoArray as Array
    print("beforeReverse=\(tempArr)")
     tempArr2 = tempArr.reverse()
    print("afterReverse=\(tempArr2)")
    tArray  = tempArr2 as NSArray
    memoArray = tArray.mutableCopy() as! NSMutableArray


    /*--------------------------------------------------*/

    UD.setObject(memoArray, forKey: "array")   
    print(memo)
    UD.synchronize()   

    writeView.text=""
    self.view.endEditing(true)   
    writeView.resignFirstResponder()

    let alert2 = UIAlertController()
    alert2.addAction(UIAlertAction(title: "Save", style: UIAlertActionStyle.Cancel, handler: nil))
    self.presentViewController(alert2, animated: true, completion: nil)

}

EditViewController.swift

从未使用变量'TD'的初始化;考虑将赋值替换为'_'或删除它 从未使用变量'TDArray'的初始化;考虑将作业替换为'_'或将其删除

@IBAction func edit(){
    var i: Int



    print(memo)



    if(searchString == ""){
        var dic  = memo[cellNum] as! Dictionary<NSObject, AnyObject>

        print("dic=\(dic)")
        dic["contents"] = editView.text as String

        memo[cellNum]=dic
        memoArray[cellNum]=memo[cellNum]!
    }else{
        var TD : Dictionary<NSObject,AnyObject> = [:]  // <—— error
        var TDArray : NSMutableArray = []              // <—— error
        let edtTxt = editView.text as String
        var dic = tmpDictionaryArray[cellNum] as! Dictionary<NSObject,AnyObject>
        dic["contents"] = edtTxt

        tmpDictionaryArray[cellNum]=dic

        let tmpId: Double = dic["id"] as! Double

        print("memo=\(memo)")

        for(var k=0;k<memo.count;k++){
            let Tmp = memo[k] as! NSDictionary
            print("Tmp=\(Tmp)")
            let double : Double = Tmp["id"] as! Double
            print("tmpId=\(tmpId)")
            print("double=\(double)")
            if(double == tmpId){

                var dic = memo[cellNum] as! Dictionary<NSObject,AnyObject>
                dic["contents"] = edtTxt
                memo[k] = dic
                memoArray[k]=memo[k]!
                print("Tmp=\(Tmp)")
                print("memo=\(memo)")
            }
        }
        print("tmpDA=\(tmpDictionaryArray)")

    }

    print(memo)
    UD.setObject(memoArray as NSArray, forKey: "array")   
    print(memo)
    UD.synchronize()   

    self.view.endEditing(true)   


    //Notification
    let ns = NSNotificationCenter.defaultCenter()
    ns.postNotificationName(MyNotification, object: nil)

   self.dismissViewControllerAnimated(true, completion: nil)   
}