子UIView无法接收触摸事件

Question

I have a UIViewController that embeds a UITableView . This table view is 3/4 the size of the entire screen in height. the remaining 1/4th of the UIViewController has a rounded UIButton that triggers a new UIView on top of the parent view. ( UITableView ).

Upon instantiating and calling a UIView with a background that is set to: self.backgroundColor = UIColor(black: 1, alpha: 0.5) it would normally fill the entire view with a black see-through background that will then have an additional UIView with the following constraints:

Leading: 10
Trailing: 10
Top: 50
Bottom: 50

this, in turn, gives me a 'Card' effect on top of the tableView . This 'Card' view then has a UITextview property that is supposed to show the keyboard when the user taps the view with the textview embedded.

The Problem: Upon selecting the UITextview , or even touching this 'Card' view, the background table is being selected and interacted with. Neither the 'Card' textfield raises the keyboard nor does it make itself solely interactive as the parent table controller seems to be getting the touch events.

Is there any solution to this problem that is encountered in iOS 11? I never experienced this issue in iOS 10. I am using iPhone X for the further note on my issue.

Here is an example of the actual issue occurring.

NOTE: If I were to select the dark area of the card itself, the table view would receive touch events but not the text area within the card view. The reason this card view has the keyboard showing is that I called it manually in code with the textview.becomeFirstResponder method.

ADDITIONAL NOTES: I have also enabled the isUserInteractionEnabled = false on the overall presenting child view. Still does not work and parent view receives touches only.

Code for the Card

class Card: UIView {

// instantiating the textview 
var textview = UITextview()
var cardView = UIView()


private override init(frame: CGRect) {
    super.init(frame: frame)

    self.backgroundColor = UIColor(black: 1, alpha: 0.5)    
    self.cardView.backgroundColor = UIColor.white
    self.cardView.layer.cornerRadius = 8

    // Just demo the textview
    self.textview.frame = CGRect(x: 10, y: 100, width: 300. height: 100)



    self.addSubview(cardView) // adding the cardView as a subview to the background colored view
    cardView.addSubview(textview)

}

required init?(coder aDecoder: NSCoder) {
    fatalError("Error")
}

private func ConstrainCardWith() {
    // Constraints 

}


}
 extension UIView {

func Width()-> CGFloat {
    return UIScreen.main.bounds.size.width
}
func Height()-> CGFloat{
    return UIScreen.main.bounds.size.height
}
}

Answer 1

问题是您的容器视图（cardview）没有框架，因此您的子视图（textview）不能触摸，因为它超出范围，因此只需在卡片视图中添加一些框架即可解决此问题