ios - 快速/重构

Question

我正在创建一个 View 以将其用作 viewDidLoad 中的 subview 。

    override func viewDidLoad() {
    let backgroundView = UIView()
    backgroundView.translatesAutoresizingMaskIntoConstraints = false
    backgroundView.backgroundColor = UIColor.blackColor()

    let viewsDictionary = ["backgroundView":backgroundView]

    let backgroundView_constraint_H = NSLayoutConstraint.constraintsWithVisualFormat(
        "H:[backgroundView(10000)]",
        options: NSLayoutFormatOptions(rawValue: 0),
        metrics: nil, views: viewsDictionary)
    let backgroundView_constraint_V = NSLayoutConstraint.constraintsWithVisualFormat(
        "V:[backgroundView(10000)]",
        options: NSLayoutFormatOptions(rawValue:0),
        metrics: nil, views: viewsDictionary)

    backgroundView.addConstraints(backgroundView_constraint_H)
    backgroundView.addConstraints(backgroundView_constraint_V)

    backgroundView.alpha = 0.9

    self.tableView.backgroundView = backgroundView
}

将所有代码放入自己的 .swift 文件并仅在 viewDidLoad 调用 self.tableView.backgroundView = backgroundView 的正确解决方法是什么？

非常感谢您的帮助。

Answer 1

        class func backgroundView()->UIView {
            let backgroundView = UIView()
            backgroundView.translatesAutoresizingMaskIntoConstraints = false
            backgroundView.backgroundColor = UIColor.blackColor()
            backgroundView.frame = self.tableView.frame
            backgroundView.alpha = 0.9

self.tableView.backgroundView = backgroundView