Question

嗨我有一个ViewController，当我的collectionview中的一个单元格被点击时会弹出。我遇到的问题是我的ViewController顶部的按钮没有响应被点击。

弹出视图控制器的代码：

import UIKit

class PopUpCellViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

var expandedNoteTable: UITableView = UITableView()
let cellId = "cellId"
var picture: UIImage?
var comment: UILabel?

let addNBackgroundView: UIView = {
    let view = UIView()
    view.backgroundColor = UIColor(r: 244, g: 244, b: 255)
    view.translatesAutoresizingMaskIntoConstraints = false
    view.layer.cornerRadius = 8
    view.layer.masksToBounds = true
    return view
}()

lazy var addNButton: UIButton = {
    let button = UIButton(type: .system)
    button.setTitle("Add N", for: .normal)
    button.translatesAutoresizingMaskIntoConstraints = false
    button.isUserInteractionEnabled = true
    button.setTitleColor(UIColor(r: 88, g: 88, b: 88), for: .normal)
    button.titleLabel?.font = UIFont(name: "Nunito", size: 17)
    button.addTarget(self, action: #selector(handleTouch), for: .touchUpInside)
    return button
}()

let viewMBackgroundView: UIView = {
    let view = UIView()
    view.backgroundColor = UIColor(r: 244, g: 244, b: 255)
    view.translatesAutoresizingMaskIntoConstraints = false
    view.layer.cornerRadius = 8
    view.layer.masksToBounds = true
    return view
}()

lazy var viewMButton: UIButton = {
    let button = UIButton(type: .system)
    button.setTitle("M", for: .normal)
    button.translatesAutoresizingMaskIntoConstraints = false
    button.setTitleColor(UIColor(r: 88, g: 88, b: 88), for: .normal)
    button.titleLabel?.font = UIFont(name: "Nunito", size: 17)
    button.isUserInteractionEnabled = true
    button.addTarget(self, action: #selector(handleTouch), for: .touchUpInside)
    return button
}()

override func viewDidLoad() {
    super.viewDidLoad()

    view.addSubview(viewMBackgroundView)
    viewMBackgroundView.addSubview(viewMButton)
    view.addSubview(addNBackgroundView)
    addNBackgroundView.addSubview(addNButton)
    view.addSubview(expandedNoteTable)

    expandedNoteTable.frame = CGRect(x: 0, y: 67, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height - (67+49))
    expandedNoteTable.delegate = self
    expandedNoteTable.dataSource = self
    expandedNoteTable.separatorColor = UIColor.clear
    expandedNoteTable.register(ExpandedNoteTableViewCell.self, forCellReuseIdentifier: "cellId")

    self.view.backgroundColor = UIColor.white

    setConstraints()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func handleTouch() {

    print("button pressed")

}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 1
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: cellId) as! ExpandedNoteTableViewCell
    cell.imageView.image = picture
    cell.commentLabel.text = comment?.text
    return cell

}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat{

    let pictureHeight = picture?.cgImage?.height

    return CGFloat(pictureHeight! + 1000)
}



func setConstraints() {

    viewMBackgroundView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -25).isActive = true
    viewMBackgroundView.topAnchor.constraint(equalTo: view.topAnchor, constant: ((self.navigationController?.navigationBar.frame.size.height)!/2)).isActive = true
    viewMBackgroundView.heightAnchor.constraint(equalToConstant: 35).isActive = true
    viewMBackgroundView.widthAnchor.constraint(equalToConstant: 90).isActive = true

    viewMButton.centerXAnchor.constraint(equalTo: viewMBackgroundView.centerXAnchor, constant: 10).isActive = true
    viewMButton.centerYAnchor.constraint(equalTo: viewMBackgroundView.centerYAnchor).isActive = true

    addNBackgroundView.rightAnchor.constraint(equalTo: viewMBackgroundView.leftAnchor, constant: -15).isActive = true
    addNBackgroundView.centerYAnchor.constraint(equalTo: viewMBackgroundView.centerYAnchor).isActive = true
    addNBackgroundView.heightAnchor.constraint(equalToConstant: 35).isActive = true
    addNBackgroundView.widthAnchor.constraint(equalToConstant: 95).isActive = true

    addNButton.centerXAnchor.constraint(equalTo: addNBackgroundView.centerXAnchor).isActive = true
    addNButton.centerYAnchor.constraint(equalTo: addNBackgroundView.centerYAnchor).isActive = true
}

}

Answer 1

尝试下面的代码

    let button:UIButton = UIButton(frame: CGRect(x: 100, y: 400, width: 100, height: 50))
    button.backgroundColor = .black
    button.setTitle("Button", for: .normal)
    button.addTarget(self, action:#selector(self.buttonClicked), for: .touchUpInside)
    self.view.addSubview(button)

    func buttonClicked() {
     print("Button Clicked")
    }

Answer 2

您的按钮代码一切正常，但看起来您将按钮放在后面的navigationController navigationBar。我假设您在其他地方有代码使导航栏清晰，否则您根本看不到按钮。

问题是：navigationBar在到达按钮之前会拦截触摸。要解决此问题，请在viewDidLoad()中（或在您设置navigationBar透明度的任何位置）添加此行：

self.navigationController?.navigationBar.isUserInteractionEnabled = false

这会关闭条形图的用户交互，允许触摸将其传递到下方的按钮。

自定义按钮无法响应触摸 - 快速

2 个答案: