问题描述
您好，我正在开发一个路线查找器应用程序，当用户搜索特定位置时，该应用程序内部将在地图上和UICollectionView中提供位置数，其中包含所找到位置列表的简短说明和“转到“ UIButton 以显示方向。但是，尽管按钮显示在单元格上并且是可触摸的，这意味着isUserInteractionEnabled为true，但按钮并未触发动作。控制台上未显示“已按下”。 （注意：屏幕截图仅供演示。）
在MapViewController中声明UICollectionView。
let collectionViewOflistofPlaces:UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
let cv = UICollectionView(frame: .zero,collectionViewLayout: layout)
cv.translatesAutoresizingMaskIntoConstraints = false
cv.register(CustomCell.self,forCellWithReuseIdentifier: "cell")
return cv
}()
在MapViewController的viewDidLoad函数中添加了这些行。
collectionViewOflistofPlaces.reloadData()
collectionViewOflistofPlaces.delegate = self
在MapViewController的扩展中，添加了以下几行功能。
func setupCollectionViewOflistofPlaces(){
hideListViewButton.translatesAutoresizingMaskIntoConstraints = false
hideListViewButton.isUserInteractionEnabled = true
collectionViewOflistofPlaces.backgroundColor = UIColor.white.withAlphaComponent(0)
collectionViewOflistofPlaces.topAnchor.constraint(equalTo: listContentView.topAnchor,constant: 0).isActive = true
collectionViewOflistofPlaces.leadingAnchor.constraint(equalTo: listContentView.leadingAnchor,constant: 10).isActive = true
collectionViewOflistofPlaces.trailingAnchor.constraint(equalTo: listContentView.trailingAnchor,constant: -10).isActive = true
collectionViewOflistofPlaces.heightAnchor.constraint(equalToConstant: view.frame.height/5).isActive = true // ?
}
func collectionView(_ collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,sizeforItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionViewOflistofPlaces.frame.height/0.8,height: collectionViewOflistofPlaces.frame.height/1.2)
}
func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
return landmarks.count
}
func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionViewOflistofPlaces.dequeueReusableCell(withReuseIdentifier: "cell",for: indexPath) as! CustomCell
let cellData = self.landmarks[indexPath.item]
cell.backgroundColor = Colors.violet3
cell.setData(dataa: cellData) //????????
cell.delegate = self
return cell
}
自定义类别：
import Foundation
import UIKit
protocol CustomCellDelegate {
func didPrintNameOfPlace(placeName: String)
}
class CustomCell: UICollectionViewCell {
// var data: Landmark? {
// didSet {
// guard let data = data else { return }
//
// }
// }
let directButton: UIButton = {
let button = UIButton(type: .system)
button.setTitle("Go",for: .normal)
button.titleLabel?.font = .systemFont(ofSize: 18)
button.addTarget(
self,action: #selector(directButtonpressed),for: UIControl.Event.touchUpInside)
button.backgroundColor = .white
return button
}()
var data: Landmark?
var delegate: CustomCellDelegate?
override init(frame: CGRect) {
super.init(frame: .zero)
setUpDirectButton()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setData(dataa: Landmark){
data = dataa
}
func setUpDirectButton(){
contentView.addSubview(directButton)
directButton.translatesAutoresizingMaskIntoConstraints = false
directButton.isUserInteractionEnabled = true
directButton.topAnchor.constraint(equalTo: contentView.topAnchor,constant: 0).isActive = true
directButton.rightAnchor.constraint(equalTo: contentView.rightAnchor,constant: 0).isActive = true
directButton.widthAnchor.constraint(equalToConstant: 50).isActive = true
directButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
directButton.frame.size.width = 50
directButton.frame.size.height = 50
}
@objc func directButtonpressed(sender: UIButton!) {
// delegate?.didPrintNameOfPlace(placeName: data!.nameOfPlace)
print("pressed")
}
}
```[Screen shot link][1]
[1]: https://i.stack.imgur.com/azHSd.jpg
解决方法
剪切此行：
button.addTarget(
self,action: #selector(directButtonPressed),for: UIControl.Event.touchUpInside)
...并将其粘贴到setupDirectButton中。您的按钮将开始工作。
用惰性标记您的按钮初始化
private lazy var directButton: UIButton = {
let button = UIButton(type: .system)
button.setTitle("Go",for: .normal)
button.titleLabel?.font = .systemFont(ofSize: 18)
button.addTarget(
self,for: UIControl.Event.touchUpInside)
button.backgroundColor = .white
return button
}()