swift – “不能调用非函数类型的值”

概述我刚刚下载了 Xcode 8 Beta,因此我可以在我的应用程序中包含一些新的iOS 10框架.但是,在将我的代码从 Swift 2转换为 Swift 3的过程中,我遇到了几个错误.除了一个超级烦人之外我修好了. 我收到错误： Cannot call value of non-function type ‘JSQMessagesCollectionView!’ at the following l 我刚刚下载了 Xcode 8 Beta,因此我可以在我的应用程序中包含一些新的iOS 10框架.但是,在将我的代码从 Swift 2转换为 Swift 3的过程中,我遇到了几个错误.除了一个超级烦人之外我修好了.

我收到错误：

Cannot call value of non-function type ‘JsQMessagesCollectionVIEw!’ at the following line of code:

let cell = super.collectionVIEw(collectionVIEw,cellForItemAtIndexPath: indexPath) as! JsQMessagesCollectionVIEwCell

这是我的整个上下文功能：

func collectionVIEw(collectionVIEw: UICollectionVIEw,cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionVIEwCell{    let cell = super.collectionVIEw(collectionVIEw,cellForItemAtIndexPath: indexPath) as! JsQMessagesCollectionVIEwCell    let message = messages[indexPath.item]    if message.senderID == senderID {        cell.textVIEw!.textcolor = UIcolor.whitecolor()    } else {        cell.textVIEw!.textcolor = UIcolor.blackcolor()    }    return cell}

有人有想法吗？

附：如果这有帮助,这是我的整个代码块：

import UIKitimport Firebaseimport JsQMessagesVIEwControllerclass ChatVIEwController: JsQMessagesVIEwController {    // MARK: PropertIEs    var rootRef = FIRDatabase.database().reference()    var messageRef: FIRDatabaseReference!    var messages = [JsQMessage]()    var outgoingBubbleImageVIEw: JsQMessagesBubbleImage!    var incomingBubbleImageVIEw: JsQMessagesBubbleImage!    var userIsTy@R_404_6817@Ref: FIRDatabaseReference! // 1    private var localTy@R_404_6817@ = false // 2    var isTy@R_404_6817@: Bool {        get {            return localTy@R_404_6817@        }        set {            // 3            localTy@R_404_6817@ = newValue            userIsTy@R_404_6817@Ref.setValue(newValue)        }    }    var usersTy@R_404_6817@query: FIRDatabasequery!    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        // Change the navigation bar background color to blue.        // navigationController!.navigationbar.barTintcolor = UIcolor.init(red:252/255,green: 87/255,blue: 68/255,Alpha: 1)        navigationController!.navigationbar.barTintcolor = UIcolor.init(red:250/255,green: 69/255,blue: 85/255,Alpha: 1)        Title = "RoastChat"        setupBubbles()        // No avatars        collectionVIEw!.collectionVIEwLayout.incomingAvatarVIEwSize = CGSize.zero        collectionVIEw!.collectionVIEwLayout.outgoingAvatarVIEwSize = CGSize.zero        // Remove file upload icon        self.inputToolbar.contentVIEw.leftbarbuttonItem = nil;        messageRef = rootRef.child("messages")    }    func vIEwDIDAppear(animated: Bool) {        super.vIEwDIDAppear(animated)        observeMessages()        observeTy@R_404_6817@()    }  func vIEwDIDdisappear(animated: Bool) {    super.vIEwDIDdisappear(animated)  }    func collectionVIEw(collectionVIEw: JsQMessagesCollectionVIEw!,messageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JsQMessageData! {        return messages[indexPath.item]    }    func collectionVIEw(collectionVIEw: JsQMessagesCollectionVIEw!,messageBubbleImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JsQMessageBubbleImageDataSource! {        let message = messages[indexPath.item] // 1        if message.senderID == senderID { // 2            return outgoingBubbleImageVIEw        } else { // 3            return incomingBubbleImageVIEw        }    }    func collectionVIEw(collectionVIEw: UICollectionVIEw,numberOfItemsInSection section: Int) -> Int {        return messages.count    }    func collectionVIEw(collectionVIEw: JsQMessagesCollectionVIEw!,avatarImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JsQMessageAvatarImageDataSource! {        return nil    }    private func setupBubbles() {        let factory = JsQMessagesBubbleImageFactory()        outgoingBubbleImageVIEw = factory?.outgoingMessagesBubbleImage(            // UIcolor.init(red:250/255,Alpha: 1))            with: UIcolor.init(red:47/255,green: 53/255,blue: 144/255,Alpha: 1))        incomingBubbleImageVIEw = factory?.incomingMessagesBubbleImage(            with: UIcolor.Jsq_messageBubblelightGray())    }    func addMessage(ID: String,text: String) {        let message = JsQMessage(senderID: ID,displayname: "",text: text)        messages.append(message!)    }    func collectionVIEw(collectionVIEw: UICollectionVIEw,cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionVIEwCell{        let cell = super.collectionVIEw(collectionVIEw,cellForItemAtIndexPath: indexPath) as! JsQMessagesCollectionVIEwCell        let message = messages[indexPath.item]        if message.senderID == senderID {            cell.textVIEw!.textcolor = UIcolor.whitecolor()        } else {            cell.textVIEw!.textcolor = UIcolor.blackcolor()        }        return cell    }    func dIDPressSendbutton(button: UIbutton!,withMessageText text: String!,senderID: String!,senderdisplayname: String!,date: NSDate!) {        let itemRef = messageRef.childByautoID() // 1        let messageItem = [ // 2            "text": text,"senderID": senderID        ]        itemRef.setValue(String(messageItem)) // 3        // 4        JsQSystemSoundplayer.Jsq_playMessageSentSound()        // 5        finishSendingMessage()        isTy@R_404_6817@ = false    }    private func observeMessages() {        // 1        let messagesquery = messageRef.querylimited(tolast: 25)        // 2        messagesquery.observe(.childAdded) { (snapshot: FIRDataSnapshot!) in            // 3            let ID = snapshot.value!["senderID"] as! String            let text = snapshot.value!["text"] as! String            // 4            self.addMessage(ID: ID,text: text)            // 5            self.finishReceivingMessage()        }    }    private func observeTy@R_404_6817@() {        let ty@R_404_6817@IndicatorRef = rootRef.child("ty@R_404_6817@Indicator")        userIsTy@R_404_6817@Ref = ty@R_404_6817@IndicatorRef.child(senderID)        userIsTy@R_404_6817@Ref.ondisconnectRemoveValue()        // 1        usersTy@R_404_6817@query = ty@R_404_6817@IndicatorRef.queryOrderedByValue().queryEqual(tovalue: true)        // 2        usersTy@R_404_6817@query.observe(.value) { (data: FIRDataSnapshot!) in            // 3 You're the only ty@R_404_6817@,don't show the indicator            if data.childrenCount == 1 && self.isTy@R_404_6817@ {                return            }            // 4 Are there others ty@R_404_6817@?            self.showTy@R_404_6817@Indicator = data.childrenCount > 0            self.scrollToBottom(animated: true)        }    }    func textVIEwDIDChange(textVIEw: UITextVIEw) {        super.textVIEwDIDChange(textVIEw)        // If the text is not empty,the user is ty@R_404_6817@        isTy@R_404_6817@ = textVIEw.text != ""    }    func collectionVIEw(collectionVIEw: JsQMessagesCollectionVIEw!,attributedTextForCellBottomLabelAtIndexPath indexPath: NSIndexPath!) -> AttributedString! {        return AttributedString(string:"test")    }}

尝试将方法更改为：

overrIDe func collectionVIEw(_ collectionVIEw: UICollectionVIEw,cellForItemAt indexPath: NSIndexPath) -> UICollectionVIEwCell{    let cell = super.collectionVIEw(collectionVIEw,cellForItemAt: indexPath) as! JsQMessagesCollectionVIEwCell    let message = messages[indexPath.item]    if message.senderID == senderID {        cell.textVIEw!.textcolor = UIcolor.whitecolor()    } else {        cell.textVIEw!.textcolor = UIcolor.blackcolor()    }    return cell}

如果您正在正确编写重写方法,Swift会抱怨缺少overrIDe关键字.因此,如果您在此重写方法上找不到任何警告或错误,则很可能会滥用方法签名.

并且许多UICollectionVIEwDataSources方法都被重命名,在Swift3中“cellForItemAtIndexPath”有这个签名：

func collectionVIEw(_ collectionVIEw: UICollectionVIEw,cellForItemAt indexPath: IndexPath) -> UICollectionVIEwCell

所以,Swift找不到匹配collectionVIEw(_：cellForItemAtIndexPath :)的方法定义,所以假设collectionVIEw会有一个属性. (不幸的是,它在JsQMessagesVIEwController中声明.)

您可能在类中有这种不匹配的方法实现.更好地检查它们.

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