如何从另一个UIView将触摸转发到UIButton?

创建 ContainerView 包含按钮和覆盖的 hitTest:withEvent: 所以它返回UIButton实例。

我以前使用过这种触摸转发,但是没有问题,所以我不知道你为什么会看到这些问题。

当我需要比按钮的视觉尺寸更大的触摸目标时,我使用下面的小类。

用法:

let button = UIButton(...) // set a title, image, target/action etc on the button
let insets = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
let buttonContainer = TouchForwardingButtonContainer(button: button, insets: insets) // this is what you add to your view

// a container view for a button that insets the button itself but forwards touches in the inset area to the button
// allows for a larger touch target than the visual size of the button itself
private class TouchForwardingButtonContainer: UIView {
    private let button: UIButton

    init(button: UIButton, insets: UIEdgeInsets) {
        self.button = button

        super.init(frame: .zero)

        button.translatesAutoresizingMaskIntoConstraints = false
        addSubview(button)
        let constraints = [
            button.topAnchor.constraint(equalTo: topAnchor, constant: insets.top),
            button.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -insets.bottom),
            button.leftAnchor.constraint(equalTo: leftAnchor, constant: insets.left),
            button.rightAnchor.constraint(equalTo: rightAnchor, constant: -insets.right)
        ]
        NSLayoutConstraint.activate(constraints)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("NSCoding not supported")
    }

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        return button
    }
}