Swift

Question

我有这个代码：

class Cell:UITableViewCell {
    var fullName:UILabel! = UILabel()
    var userImage:UIImage! = UIImage()

    override func awakeFromNib() {
        super.awakeFromNib()
        println("wake")
        fullName.setTranslatesAutoresizingMaskIntoConstraints(false)
        contentView.addSubview(fullName)
        let imageView = UIImageView(image: userImage)
        contentView.addSubview(imageView)
        var viewsDict = [
            "fullName" : fullName,
            "userImage" : userImage
        ]

        contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[userImage(10)]", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDict))
        contentView.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[fullName]-[userImage(10)]-|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDict))
    }
}

viewDidLoad:

var tableView = UITableView()
tableView.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.height-64)
tableView.delegate = self
tableView.dataSource = self
var cell = Cell.self
tableView.registerClass(cell, forCellReuseIdentifier: "cell")
self.view.addSubview(tableView)

cellForRowAtIndexpath:

let cell:Cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as Cell
cell.fullName.text = testarray.objectAtIndex(indexPath.row) as? String
return cell

我执行代码时看不到单元格中的标签，甚至 class 单元格中的 println("wake") 也没有执行。

Answer 1

awakeFromNib 仅在从笔尖或故事板加载对象时调用。您没有这样做，因为 class 已注册。

您需要将该代码移动到 initWithStyle:reuseIdentifier 方法，如 UITableView 文档中提到的 dequeue 方法：

If you registered a class for the specified identifier and a new cell must be created, this method initializes the cell by calling its initWithStyle:reuseIdentifier: method. For nib-based cells, this method loads the cell object from the provided nib file

Answer 2

您的自定义 UITableViewCell 应该像下面的代码：

class ListTableViewCell: UITableViewCell {

    var lblTitle = UILabel()

    override init(style: UITableViewCellStyle, reuseIdentifier: String!) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        lblTitle = UILabel(frame: CGRectZero)
        lblTitle.font = UIFont(name: "HelveticaNeue-Light", size: 18.0)
        lblTitle.textAlignment = NSTextAlignment.Right
        lblTitle.numberOfLines = 1
        lblTitle.backgroundColor = UIColor.clearColor()
        lblTitle.textColor = UIColor(red: 130/255, green: 137/255, blue: 141/255, alpha: 1.0)
        self.contentView.addSubview(self.lblTitle)
        // 130 137 141
        self.separatorInset = UIEdgeInsets(top: 0, left: 100, bottom: 0, right: -100)

    }

    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func layoutSubviews() {

        var marginX = CGFloat(30.0)
        var marginY = CGFloat(0.0)
        var width = CGFloat(320)
        var height = self.contentView.frame.size.height

        self.lblTitle.frame = CGRectMake(marginX, marginY, width, height)
    }

}

这就是如何在 UITableView 数据源的 cellForRowAtIndexPath 方法中创建单元格。

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        var cell:ListTableViewCell! = tableView.dequeueReusableCellWithIdentifier(self.cellIdentifier) as? ListTableViewCell

        if (cell == nil) {
            cell = ListTableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: self.cellIdentifier)
        }
        cell.lblTitle.text = self.listItems[indexPath.row]
        return cell
    }

Swift - 以编程方式添加 UITableViewCell 无法正常工作

Swift - Add UITableViewCell programmatically don't work properly

uitableview

ios