xcode - Swift 2 tableview 滚动更改数据

Question

我无法正确加载数据!顶部的单元格加载良好，然后当我向下滚动并返回时，曾经必须是电话号码的黑色图标会亮起，当它们被触摸时，它们会调用一个随机号码。这很奇怪，因为其他带有电话号码的单元格不会只更改剩下等于“”的单元格。

这是来自 ViewController.swift

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return contactList.count
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! TableViewCell

    let contact = contactList[indexPath.row]

    cell.name.text = "\(contact.name)"

    cell.id.text = "\(phoneFormat(contact.callPhone))"

    if contact.callPhone != "" {

        cell.callButton.setImage(UIImage(named: "phone.png"), forState: UIControlState.Normal)

        cell.callButton.userInteractionEnabled = true

        cell.callButton.tag = indexPath.row

        cell.callButton.addTarget(self, action: "call:", forControlEvents: .TouchUpInside)

    }

   /* if contact.smsPhone != nil {

        cell.smsButton.setImage(UIImage(named: "chat.png"), forState: UIControlState.Normal)

        cell.smsButton.userInteractionEnabled = true

        cell.smsButton.tag = indexPath.row
    }

    if contact.email != nil {

        cell.emailButton.setImage(UIImage(named: "email.png"), forState: UIControlState.Normal)

        cell.emailButton.userInteractionEnabled = true

        cell.emailButton.tag = indexPath.row

    }*/

    return cell
}

这是 tableviewcell.swift 文件

class TableViewCell: UITableViewCell {

@IBOutlet var name: UILabel!

@IBOutlet var id: UILabel!

@IBOutlet var callButton: UIButton!

override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code
}

override func setSelected(selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)

    // Configure the view for the selected state
}}

Answer 1

您看到此行为的原因是您的 if 缺少 else 分支，您可以在该分支中清除 中设置的视觉内容如果:

if contact.callPhone != "" {
    cell.callButton.setImage(UIImage(named: "phone.png"), forState: UIControlState.Normal)
    cell.callButton.userInteractionEnabled = true
    cell.callButton.tag = indexPath.row
    cell.callButton.addTarget(self, action: "call:", forControlEvents: .TouchUpInside)
} else {
    cell.callButton.setImage(nil, forState: UIControlState.Normal)
    cell.callButton.userInteractionEnabled = false
    cell.callButton.tag = 0
    cell.callButton.hidden = true
}

这将防止滚动到屏幕外的重复使用单元格的按钮出现在缺少电话号码的单元格中。