子类化 UICollectionReusableView：参考 "content area"

Question

我正在尝试继承 UICollectionReusableView 以简化一些代码。我运行遇到了一个问题，就是 "add the view to" 建成后要做什么。

这是我想做的一个例子，以 UICollectionViewCell 为例：

class CVCell: UICollectionViewCell {

    let textLabel: UILabel!

    override init(frame: CGRect) {

        let textFrame = CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height)
        textLabel = UILabel(frame: textFrame)

        super.init(frame: frame)

        textLabel.font = UIFont.systemFontOfSize(10)
        textLabel.autoresizingMask = UIViewAutoresizing.FlexibleHeight | UIViewAutoresizing.FlexibleWidth
        textLabel.textAlignment = NSTextAlignment.Center
        textLabel.backgroundColor = UIColor.clearColor()

        contentView.addSubview(textLabel)
    }

    required init(coder aDecoder: NSCoder) {
    ...

    }
}

在这里，当我准备添加 UILabel 时，我将其添加到 contentView。我似乎无法找到 UICollectionReusableView 的并行子视图来引用。所以我写了这个并到达最后一行，但我不确定在我有占位符 "ConfusionHere":

的地方放什么

class CVHeaderView: UICollectionReusableView {

    let textLabel: UILabel!

    override init(frame: CGRect) {

        let textSize = CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height)
        textLabel = UILabel(frame: textSize)

        super.init(frame: frame)
        textLabel.font = UIFont.systemFontOfSize(10)
        textLabel.autoresizingMask = UIViewAutoresizing.FlexibleHeight | UIViewAutoresizing.FlexibleWidth
        textLabel.textAlignment = NSTextAlignment.Center
        textLabel.backgroundColor = UIColor.clearColor()

        ConfusionHere.addSubview(textLabel)
}

我可能在这里遗漏了一些概念，但我搜索了文档，发现 UICollectionReusableView.

与 "contentView" 没有相似之处

Answer 1

只需做 self.addSubView(textLabel)

class CVHeaderView: UICollectionReusableView {

let textLabel: UILabel!

override init(frame: CGRect) {

    let textSize = CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height)
    textLabel = UILabel(frame: textSize)

    super.init(frame: frame)
    textLabel.font = UIFont.systemFontOfSize(10)
    textLabel.autoresizingMask = UIViewAutoresizing.FlexibleHeight | UIViewAutoresizing.FlexibleWidth
    textLabel.textAlignment = NSTextAlignment.Center
    textLabel.backgroundColor = UIColor.clearColor()


    self.addSubview(textLabel) // confusion removed
}

子类化 UICollectionReusableView：参考 "content area"

Subclassing UICollectionReusableView: reference to "content area"

subclass

ios

uicollectionview

swift