【问题标题】:UITableView in xcode playground is not showing text/subtitlesxcode 游乐场中的 UITableView 不显示文本/字幕
【发布时间】:2018-03-25 10:56:16
【问题描述】:

我正在关注一篇关于 WWDC17 的文章。一切都很好,但我的实时视图看起来不像它应该的样子。 (.subtitle) 和表格单元格没有显示任何内容

谁能帮我完成这项工作?

下面是操场:

import PlaygroundSupport
import UIKit

class WWDCMasterViewController: UITableViewController {

    var reasons = ["WWDC is great", "the people are awesome", "I love lab works", "key of success"]

    override func viewDidLoad() {
        title = "Reason I should attend WWDC18"
        view.backgroundColor = .lightGray
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        var cell: UITableViewCell!
        cell = tableView.dequeueReusableCell(withIdentifier: "Cell")
        if cell == nil {
            cell = UITableViewCell(style: .subtitle , reuseIdentifier: "Cell")
            cell.accessoryType = .disclosureIndicator
        }

        let reason = reasons[indexPath.row]
        cell.detailTextLabel?.text = "I want to attend because\(reason)"
        cell.textLabel?.text = "Reason #\(indexPath.row + 1)"

        return cell
    }
}

let master = WWDCMasterViewController()
let nav = UINavigationController(rootViewController: master)
PlaygroundPage.current.liveView = nav

【问题讨论】:

    标签: swift xcode swift-playground wwdc


    【解决方案1】:

    由于您缺少 UITableViewDataSource 的方法 numberOfRowsInSection,因此您的 UITableView 最终有 0 行,请尝试添加以下内容:

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.reasons.count
    }
    

    这里是固定的游乐场:

    import PlaygroundSupport
    import UIKit
    
    class WWDCMasterViewController: UITableViewController {
    
        var reasons = ["WWDC is great", "the people are awesome", "I love lab works", "key of success"]
    
        override func viewDidLoad() {
            title = "Reason I should attend WWDC18"
            view.backgroundColor = .lightGray
        }
    
        override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            return self.reasons.count
        }
    
        override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            var cell: UITableViewCell! = tableView.dequeueReusableCell(withIdentifier: "Cell")
            if cell == nil {
                cell = UITableViewCell(style: .subtitle , reuseIdentifier: "Cell")
                cell.accessoryType = .disclosureIndicator
            }
    
            let reason = reasons[indexPath.row]
            cell.detailTextLabel?.text = "I want to attend because\(reason)"
            cell.textLabel?.text = "Reason #\(indexPath.row + 1)"
    
            return cell
        }
    }
    
    let master = WWDCMasterViewController()
    let nav = UINavigationController(rootViewController: master)
    PlaygroundPage.current.liveView = nav
    

    【讨论】:

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