Question

我试图将我的字典中的“专业”与每个专业的相关图片对应，以便显示在单元格中。

import Foundation

class ClassRosterModel {
    var studentsRoster = [Dictionary<String, String>] ()
    init () {
        studentsRoster.append(["name": "Kaz, Alex", "number" : "s0834347", "major" : "SE"])
        studentsRoster.append(["name": "O'Rore, Ryan", "number" : "s0835357", "major" : "SE"])
        studentsRoster.append(["name": "Lote, Lote", "number" : "s0835357", "major" : "SE"])
        studentsRoster.append(["name": "Flora, Nico", "number" : "s0748324", "major" : "MA"])
    }
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("studentCell", forIndexPath: indexPath)

    // Configure the cell...
    cell.textLabel?.text = studentsList[indexPath.row]["name"]
    cell.detailTextLabel?.text = studentsList[indexPath.row]["number"]
    print("Student's name: \(studentsList[indexPath.row]["name"])")
    print("Student's number: \(studentsList[indexPath.row]["number"])")

    return cell

Answer 1

你可以制作一本字典来映射你的＆＃34; major＆＃34;对于图像，例如：

let images = [
    "SE": UIImage(named: "se-image.png"),
    "MD": UIImage(named: "another-image.png")
]
let major = studentsList[indexPath.row]["major"]
if let image = images[major] {
    cell.imageView?.image = image
}

我会对你好，并为你提供一个更好的例子来说明如何编写好的Swift代码：

enum Major: String {
    case SE
    case MA

    var image: UIImage? {
        return UIImage(named: self.rawValue)
    }
}
struct Student {
    let name: String
    let number: String
    let major: Major
}

class SomeTableViewController: UITableViewController {
    let students = [
        Student(name: "Kaz, Alex",    number: "s0834347", major: .SE),
        Student(name: "O'Rore, Ryan", number: "s0835357", major: .SE),
        Student(name: "Lote, Lote",   number: "s0835357", major: .SE),
        Student(name: "Flora, Nico",  number: "s0748324", major: .MA)
    ]

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let student = students[indexPath.row]

        let cell = tableView.dequeueReusableCellWithIdentifier("studentCell", forIndexPath: indexPath)
        cell.textLabel?.text = student.name
        cell.detailTextLabel?.text = student.number
        cell.imageView?.image = student.major.image
        return cell
    }
}

Answer 2

在您的代码中，您已声明var studentsRoster = [Dictionary<String, String>] ()，这意味着包含键和字符串的字典数组。字符串的值。你可能想要做的第一件事就是修复它，如果你不打算将它作为一个字典数组。

基本上，[String]是字符串数组的简写。 Array<String>是长形式。同样，Dictionary<String, String>是声明字典的长形式，您可以使用[String:String]的简写

因此，您需要开始的代码很可能是var studentsRoster = [String:String]()

您可以添加新密钥并使用studentsRoster["key"] = "Value"

设置其值

阅读以下内容对您有很大好处：https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-ID113

访问String键以显示获取图像（Swift）

2 个答案: