如何聚焦UIView？

Question

我想实现单选按钮之类的功能。更具体地说，我想实现从几个UIView中仅选择一个UIView的功能。这类似于 tvOS 上的Focus Engine。

在搜索相关内容时，我注意到UIKit支持Focus-based Navigation。但是我不确定这是否完全支持我想要的。也缺少其他相关示例。

我想听听有关相关功能的帮助和建议。 基于焦点的导航是否适合我追求的目标？还有其他好的方法可以实现我要实现的功能吗？

Answer 1

@Paulw谢谢你的热心帮助。

以下步骤解决了该问题！

我使用了一个简单的方式影响特定UIView多个间UIViews。

import UIKit

class ViewController: UIViewController {
    var selectView: UIView?

    override func viewDidLoad() {
        super.viewDidLoad()

        selectView = self.view

        let viw = UIView(frame: CGRect(x: 100, y: 100, width: 150, height: 150))
        viw.backgroundColor = UIColor.white
        viw.layer.cornerRadius = 10
        self.view.addSubview(viw)

        let objectView = ObjectView()
        objectView.frame.size = CGSize(width: 150, height: 150)
        objectView.backgroundColor = UIColor.clear

        self.view.addSubview(objectView)

        let tapObject = UITapGestureRecognizer(target: self, action: #selector(handleTap(sender:)))
        objectView.addGestureRecognizer(tapObject)

        let tapObjects = UITapGestureRecognizer(target: self, action: #selector(handleTap(sender:)))
        viw.addGestureRecognizer(tapObjects)

        let tapRootView = UITapGestureRecognizer(target: self, action: #selector(handleTap(sender:)))
        self.view.addGestureRecognizer(tapRootView)
    }

    @objc func handleTap(sender: UITapGestureRecognizer) {
        if sender.state == .ended {
            if selectView != self.view {
                selectView?.layer.shadowColor = UIColor.clear.cgColor
            }

            selectView = sender.view

            if selectView != self.view {
                sender.view?.layer.shadowOffset = .zero
                sender.view?.layer.shadowOpacity = 0.5
                sender.view?.layer.shadowColor = UIColor.black.cgColor
            }
        }
    }
}