swift问题数组无法打印到collectionviewcell标签

Posted 2023-03-14

【中文标题】swift问题数组无法打印到collectionviewcell标签

【英文标题】：Swift problem the array can't print to the collectionviewcell label

【发布时间】：2020-11-10 13:39:38

【问题描述】：

我尝试将集合视图作为这个 url How to make a simple collection view with Swift

但是标签无法连接到collectionviewcell.swift：

有一个Mycollectionview.swift：

只能显示背景，不能打印文字：

MyControllectionCell.swift

import UIKit
class MyCollectionViewCell: UICollectionViewCell 

    @IBOutlet weak var myLabel: UILabel!

ViewController.swift

import UIKit
class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate 
    
    let reuseIdentifier = "cell" // also enter this string as the cell identifier in the storyboard
    var items = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46", "47", "48"]
    
    
    // MARK: - UICollectionViewDataSource protocol
    
    // tell the collection view how many cells to make
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
        return self.items.count
    
    
    // make a cell for each cell index path
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
        
        // get a reference to our storyboard cell
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! MyCollectionViewCell
        
        // Use the outlet in our custom class to get a reference to the UILabel in the cell
        cell.myLabel?.text = self.items[indexPath.item] // The row value is the same as the index of the desired text within the array.
        cell.backgroundColor = UIColor.cyan // make cell more visible in our example project
        
        return cell
    
    
    // MARK: - UICollectionViewDelegate protocol
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) 
        // handle tap events
        print("You selected cell #\(indexPath.item)!")
    

【参考方案1】：

tldr;先看看教程。

长答案：

我猜你正在尝试将UILabel 连接到你的UIViewController 子类而不是UICollectionViewCell。

但我有点不确定，因为您提供的代码 sn-p 不完整... 例如。我没有看到您的 UICollectionView 属性列在您的 UIViewController 子类下。

所以这只是我的假设。

也不确定您的 UICollecitonView 的 delegate 和 dataSource 属性是否正确设置。

仔细检查label 不是cellForItemAt 方法中的nil，并且它是具有非零框架的单元格视图层次结构的一部分。

但老实说，您绝对应该先查看教程。有很多很棒的教程可以帮助您逐步实现这一点。