swift - 从另一个 .swift 文件调用 ViewController 函数

Question

一旦收到某些数据，我就有一个collectionView想要的。reloadData()问题是：我不知道如何从另一个处理数据的 .swift 文件中调用 ViewController 函数。我试着做：

class WebSocketLogic: WebSocketDelegate {
    var viewController = ViewController()
    var columns = 0
    var rows = 0
...
    func receiveData {
        ...
        columns = map.count
        rows = map[0].count
        viewController.collectionView.reloadData()
    }
}

它在初始化行时给了我Thread 1: EXC_BAD_ACCESS (code=2, address=0x7ffeec870fe8)错误。 我也尝试过：ViewController()

class ViewController: UIViewController {
    
    @IBOutlet weak var collectionView: UICollectionView!
    
    var webSocket = WebSocketLogic(roomId: 1)
    var columns = 0 {
        didSet {
            collectionView.reloadData()
            print("columns number set to: \(columns)")
        }
    }
    var rows = 0  

    override func viewDidLoad() {
        super.viewDidLoad()
        
        webSocket.setupStarScream()
        columns = webSocket.columns
        rows = webSocket.rows
    }
}

但是由于某种原因， didSet 只在开始时被调用一次。一旦funcreloadData()在另一个文件中完成，我该怎么做才能调用？ViewControllerreceiveData()

标签： swiftxcodemodel-view-controllerviewcontroller

Answer 1

您可以使用委托模式

protocol DataDelegate {
    func dataReceived()
}

class WebSocketLogic: WebSocketDelegate {
    var delegate: DataDelegate?
    var columns = 0
    var rows = 0
...
    func receiveData {
        ...
        columns = map.count
        rows = map[0].count
        delegate?.dataReceived()
    }
}

class ViewController: UIViewController, DataDelegate {
    
    @IBOutlet weak var collectionView: UICollectionView!
    
    var webSocket = WebSocketLogic(roomId: 1)
    var columns = 0 {
        didSet {
            collectionView.reloadData()
            print("columns number set to: \(columns)")
        }
    }
    var rows = 0  

    override func viewDidLoad() {
        super.viewDidLoad()
        webSocket.delegate = self
        
        webSocket.setupStarScream()
        columns = webSocket.columns
        rows = webSocket.rows
    }
   
    func dataReceived() {
        collectionView.reloadData()
    }
}