Question

我想在tableView中向不同的单元格添加不同的图像，其中我已经有了一个字符串列表，这是我的代码，类别的结构：

  struct QCategoryy {
        var name:String
        var image:UIImage
        var isSelected = false
        init(name:String, image.UIImage) {
            self.name = name
            self.image = image
}


    extension QCategoryy: ExpressibleByStringLiteral {
        init(stringLiteral value: String) {
            self.name = value
        }
        init(unicodeScalarLiteral value: String) {
            self.init(name: value)
        }
        init(extendedGraphemeClusterLiteral value: String) {
            self.init(name: value)
        }
    }

这里是我创建列表的地方（我将添加到tableView中）

import Foundation
import UIKit
import CoreLocation
import Alamofire

class NearbyPlaces {
    static func getCategories() -> [QCategoryy] {
        let list:[QCategoryy] = ["Art_gallery", "Amusement_park", "Zoo", "Bar", "Night_club", "Movie_theater", "Restaurant", "Shopping_mall", "Atm", "Gym", "Store", "Spa", "Museum", "Stadium", "Hardware_store", "Casino", "Library", "Painter", "Book_store", "Bowling_alley", "Cafe", "Clothing_store",  ]
        return list
    }

对于列表中的每个项目，我想添加单元格大小的特定图像，但我该怎么办？

修改

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let identifier = "CATEGORY_CELL"
        let cell = tableView.dequeueReusableCell(withIdentifier: identifier, for: indexPath)
        let selectedIndexPaths = tableView.indexPathsForSelectedRows
        let rowIsSelected = selectedIndexPaths != nil && selectedIndexPaths!.contains(indexPath)
       /* cell.accessoryType = rowIsSelected ? .checkmark : .none  */
        cell.accessoryType = list[indexPath.row].isSelected ? .checkmark : .none
        cell.textLabel?.text = list[indexPath.row].name
        return cell
    }

Answer 1

列表是静态的，对吗？

为什么不向对象添加图片网址（或您需要的图片网址）。这将解决你的问题^^。所以你可以在单元格中调用它来行：）

Answer 2

public class ViewData extends AppCompatActivity {

DatabaseHelper mDb;
TextView EList;
Button mBtn;
ListView listView;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_view_data);

    listView = (ListView) findViewById(R.id.listView);
    mBtn = (Button) findViewById(R.id.buttonList);
    mDb=new DatabaseHelper(this);
    view1All();



}


public void view1All() {
    mBtn.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    ArrayList<String> theList=new ArrayList<>();

                    Cursor res = mDb.getAllData();
                    if(res.getCount() == 0) {
                        // show message
                      //  showMessage("Error","Nothing found");
                      //  return;
                    }




                    while (res.moveToNext()) {
                        theList.add(res.getString(1));
                        ListAdapter listAdapter=new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,theList);
                        listView.setAdapter(listAdapter);
                    }


                }
            }
    );
}

}

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Answer 3

正如@TMX所说，你可以使用：

func cellForRow(at indexPath: IndexPath) -> UITableViewCell?

请参阅：https://developer.apple.com/documentation/uikit/uitableview/1614983-cellforrow

并且：https://stackoverflow.com/a/8079765/7510062

如果您刚开始编写代码，则应遵循本教程：https://developer.apple.com/library/content/referencelibrary/GettingStarted/DevelopiOSAppsSwift/CreateATableView.html

..为了理解它的工作原理，它应该很容易！

Answer 4

如果您可以创建自定义单元格会更好。而是在CellForRowAtIndex方法中使用相同的代码。

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let identifier = "CATEGORY_CELL"
            let cell = tableView.dequeueReusableCell(withIdentifier: identifier, for: indexPath)
            let selectedIndexPaths = tableView.indexPathsForSelectedRows
            let rowIsSelected = selectedIndexPaths != nil && selectedIndexPaths!.contains(indexPath)

            cell.accessoryType = list[indexPath.row].isSelected ? .checkmark : .none
            cell.textLabel?.text = list[indexPath.row].name
            cell.imageView?.image = list[indexPath.row].image // make sure you are saving images in struct.
            return cell
        }

初始化为

init(name:String, image:UIImage) {
            self.name = name
            self.image = image
        }

将func更改为

static func getCategories() -> [QCategoryy] {
        let list:[QCategoryy] = [QCategoryy(name: "name", image: UIImage(named: "imageName")!)]
        return list
    }

扩展代码：

extension QCategoryy: ExpressibleByStringLiteral {
     init(stringLiteral value: String) {
            self.name = value
            self.image = UIImage()
        }
        init(unicodeScalarLiteral value: String) {
            self.init(name: value, image: UIImage())
        }
        init(extendedGraphemeClusterLiteral value: String) {
            self.init(name: value, image: UIImage())
        }
    }

如何以编程方式将不同单元格的不同图像添加到tableView（Swift）

4 个答案: