UITableView无法正确显示索引在Swift 3中的数据
问题描述:
我的应用程序项目中有一个UITableView,它从数组中提取数据。此数据也必须编入索引。但由于某些原因,数据不会显示在适当的部分,即A,B等。我似乎无法看到什么是错的。我的数据到目前为止是:UITableView无法正确显示索引在Swift 3中的数据
import Foundation
import UIKit
class uniVC: UITableViewController {
let university = ["Allcat University", "Allday University", "Bejnamin University", "Cat University"]
var universitySections = [String]()
var wordsDict = [String:[String]]()
let wordIndexTitles = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"]
func generateWordsDict() {
for word in university {
let key = "\(word[word.startIndex])"
let lower = key.lowercased()
if var wordValues = wordsDict[lower] {
wordValues.append(word)
wordsDict[lower] = wordValues
} else {
wordsDict[lower] = [word]
}
}
universitySections = [String](wordsDict.keys)
universitySections = universitySections.sorted()
}
override func viewDidLoad() {
super.viewDidLoad()
generateWordsDict()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
//Dispose
}
// Mark table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return universitySections.count
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return universitySections[section]
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
let wordKey = universitySections[section]
if let wordValues = wordsDict[wordKey] {
return wordValues.count
}
return 0
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
let wordKey = universitySections[indexPath.section]
if wordsDict[wordKey.lowercased()] != nil {
cell.textLabel?.text = university[indexPath.row]
}
return cell
}
override func sectionIndexTitles(for tableView: UITableView) -> [String]? {
return wordIndexTitles
}
override func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int {
guard let index = universitySections.index(of: title) else {
return -1
}
return index
}
}
对此问题的任何建议?
答
所有的东西都很好,除外:
if wordsDict[wordKey.lowercased()] != nil {
cell.textLabel?.text = university[indexPath.row]
}
我想你搞错了。让我们改变:
if let wordValues = wordsDict[wordKey] {
cell.textLabel?.text = wordValues[indexPath.row]
}
+0
谢谢,工作正常。 – Sole
答
你的问题是在这里:
if wordsDict[wordKey.lowercased()] != nil {
cell.textLabel?.text = university[indexPath.row]
}
无论你是在哪个部分(即A,B或C)你然后再问第一所大学,而不是第一所大学,该部分是。你可能打算看看wordsDict
,而不是university
。
尝试用这种替代它:
if let wordValues = wordsDict[wordKey.lowercased()] {
cell.textLabel?.text = wordValues[indexPath.row]
}
我不明白你的问题。目前的产出是多少?预期的产出是多少?不要让人猜测问题是什么。另外,您是否使用了断点和调试器来遍历代码以查找逻辑中的错误? –
我不是让人猜测问题是什么,阅读问题 - 数据不显示在适当的部分,即一个不显示在等... – Sole
截图添加到帮助 – Sole