Swift - 将tableview添加到UIViewController

Question

我正在swift中构建一个iOS应用程序。我有一个显示一些标签和字段的UIViewController，我想添加一个tableview。我是一个完全快速的菜鸟，但经过大量的谷歌搜索，我已经把所有的东西整合在一起并且工作了＃34;正常。但是，我遇到了一个致命的错误：在解开一个Optional值时意外地发现了nil＆＃34;当我使用dequeueReusableCellWithIdentifier时。我的单元格是一个自定义类，只有两个IBOutlets，detailKey和detailValue。有什么建议吗？

import UIKit

class ContactViewController: UIViewController, UITableViewDataSource,     UITableViewDelegate {

// MARK:Properties
var contact : Contact?
var params : [Detail]?

@IBOutlet weak var keywords: UILabel!
@IBOutlet weak var name: UILabel!
@IBOutlet weak var contactDetails: UITableView!

// for use in params array
struct Detail {
    var key : String,
        value : String
}

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
    contactDetails.dataSource = self
    contactDetails.delegate = self

    if (self.contact != nil) {
        // set default value for params array since optional
        self.params = []

        // make keywords string
        var count : Int = 0
        var keywordString : String = ""

        while count < contact!.keywords.count {
            keywordString += contact!.keywords[count].description

            if count + 1 < contact!.keywords.count {
                keywordString += ", "
            }

            count += 1
        }

        // compile details for tableview
        if (!self.contact!.company.isEmpty) { self.params! += [Detail(key: "Company", value: self.contact!.company)] } // company
        if (!self.contact!.phone1.isEmpty) {
            self.params! += [Detail(key: self.contact!.phone_label1.isEmpty ? "Phone 1" : self.contact!.phone_label1, value: self.contact!.phone1)]
        }
        if (!self.contact!.phone2.isEmpty) {
            self.params! += [Detail(key: self.contact!.phone_label2.isEmpty ? "Phone 2" : self.contact!.phone_label2, value: self.contact!.phone2)]
        }
        if (!self.contact!.email1.isEmpty) {
            self.params! += [Detail(key: self.contact!.email_label1.isEmpty ? "Email 1" : self.contact!.email_label1, value: self.contact!.email1)]
        }
        if (!self.contact!.email2.isEmpty) {
            self.params! += [Detail(key: self.contact!.email_label2.isEmpty ? self.contact!.email_label2 : "Email 2", value: self.contact!.email2)]
        }
        if (!self.contact!.street.isEmpty) { self.params! += [Detail(key: "Address", value: self.contact!.address)] } // address (condition checks for street)
        if (!self.contact!.dob.isEmpty) { self.params! += [Detail(key: "Birthday", value: self.contact!.dob)] } // dob
        if (!self.contact!.social.isEmpty) { self.params! += [Detail(key: "Social Security Number", value: self.contact!.social)] } // social

        self.name.text = contact!.name
        self.keywords.text = keywordString
    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

// table view stuffs
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return self.params!.count ?? 0
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    print("going")
    let cell = tableView.dequeueReusableCellWithIdentifier("contactDetail") as! ContactDetailTableViewCell
    let param = self.params![indexPath.row]

    print(param.key + ": " + param.value)

    cell.detailKey.text = param.key
    cell.detailValue.text = param.value

    return cell
}

Answer 1

确保您的IBOutlet已正确连接。从视图拖到代码中的连接。

Answer 2

设置您的小区标识符选择您的小区，然后您会在Attributes Inspector中看到标识符字段，在那里设置您的重用标识符...这就是它......

还尝试添加： -

func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
}

并替换

 let cell = tableView.dequeueReusableCellWithIdentifier("contactDetail") as! ContactDetailTableViewCell

到

let cell = tableView.dequeueReusableCellWithIdentifier("contactDetail", forIndexPath: indexPath) as! ContactDetailTableViewCell

<强>说明

CMD +点击功能名称：dequeueReusableCellWithIdentifier - 您将被引导至其文档..

public func dequeueReusableCellWithIdentifier(identifier: String) -> UITableViewCell? // Used by the delegate to acquire an already allocated cell, in lieu of allocating a new one.
@available(iOS 6.0, *)
public func dequeueReusableCellWithIdentifier(identifier: String, forIndexPath indexPath: NSIndexPath) -> UITableViewCell // newer dequeue method guarantees a cell is returned and resized properly, assuming identifier is registered

• dequeueReusableCellWithIdentifier(identifier: String, forIndexPath indexPath: NSIndexPath)保证你有一个牢房..

也许这些链接很有帮助： -

Fatal error: unexpectedly found nil while unwrapping an Optional values

https://stackoverflow.com/a/25569704/6297658