xcode 重新加载集合视图数据时对成员“collectionView(_:numberOfItemsInSection:)”的不明确引用
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Ambiguous reference to member 'collectionView(_:numberOfItemsInSection:)' when reloading collection view data
提问by Ryan Tremblay
In an app I've been writing, one of the tabs contains a Collection View that is originally filled with dummy information, but is supposed to be replaced once the user inputs some information in another tab. However, when I try to use self.collectionView?.reloadData()Xcode says Ambiguous reference to member 'collectionView(_:numberOfItemsInSection:)'. The code relevant to getting the data for the slots was removed. Does anyone here have any idea why it isn't working?
在我一直在编写的应用程序中，其中一个选项卡包含一个集合视图，该视图最初填充了虚拟信息，但是一旦用户在另一个选项卡中输入了一些信息，就应该被替换。但是，当我尝试使用self.collectionView?.reloadData()Xcode 时说Ambiguous reference to member 'collectionView(_:numberOfItemsInSection:)'. 删除了与获取插槽数据相关的代码。这里有人知道为什么它不起作用吗？
//
// FirstViewController.swift
import UIKit
import Alamofire
class FirstViewController: 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"]
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
self.collectionView?.reloadData()
}
// 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]
cell.backgroundColor = UIColor.white
cell.layer.borderColor = UIColor.white.cgColor
cell.layer.borderWidth = 5
cell.layer.cornerRadius = 8// 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)!")
}
}
}
回答by Josh Homann
You are using UIViewControllerand not UICollectionViewControllerso you don't get the collectionViewproperty for free. You need to drag in an outlet form your storyboard and name it @IBOutlet var collectionView: UICollectionView!.
您使用的是UIViewController而不是UICollectionViewController，因此您无法免费获得collectionView属性。您需要从故事板中拖入一个插座并将其命名为@IBOutlet var collectionView：UICollectionView！.
