将UITapGestureRecognizer添加到UIPickerView的子视图中

Question

Im having problems receiving a UITapGesture on a UILabel which is a subview of a UIPickerView .

let statusDisplayLabel = UILabel(frame: CGRect(x: 0,
                                               y: 0,
                                           width: <#width of UIPickerView #>,
                                          height: <# height of UIPickerView row #>))

statusDisplayLabel.isUserInteractionEnabled = true

let tapGesture = UITapGestureRecognizer(target: self,
                                        action: #selector(didTapStatusDisplayLabel(tap:)))

tapGesture.numberOfTapsRequired = 1
tapGesture.numberOfTouchesRequired = 1
statusDisplayLabel.addGestureRecognizer(tapGesture)



<# UIPickerView #>.addSubview(statusDisplayLabel)



@objc func didTapStatusDisplayLabel(tap: UITapGestureRecognizer){
                print("tapped")
}

The UILabel displays as it should over the UIPickerView . However "tapped" message is never displayed in console as the tap just falls through the statusDisplayLabel and moves the UIPickerView instead. It's as if the UILabel is not there

What am I missing?

Answer 1

尝试创建Container View ，在该视图中放入UIPickerView，并尝试将标签添加到Container View中，而不是将其添加到选择器视图中。

Answer 2

Check following

First check view hierarchy, is label on top of picker view

if all correct then

Here, missing part is only userInteractionEnabled

EDIT

You can debug view hierarchy using

EDIT2

You can implement func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? in subclass of UIView as alternative solution. If you need demo then I can post