SwiftUI：类型不符合协议“UIViewRepresentable”

Posted 2023-03-16

【中文标题】SwiftUI：类型不符合协议“UIViewRepresentable”

【英文标题】：SwiftUI: Type does not conform to protocol 'UIViewRepresentable'

【发布时间】：2020-04-28 15:21:01

【问题描述】：

我正在开发一个新的 SwiftUI 应用程序，并试图弄清楚如何使这个 Swift 项目与 SwiftUI 兼容： https://github.com/suzuki-0000/SKPhotoBrowser

问题是我无法使 UIViewRepresentable 工作。 我收到一个错误：

类型“PhotoViewer”不符合协议“UIViewRepresentable”

这是我的代码：

struct PhotoViewer: UIViewRepresentable 

    @Binding var viewerImages:[SKPhoto]
    @Binding var currentPageIndex: Int

    func makeUIView(context: Context) -> SKPhotoBrowser 
        let browser = SKPhotoBrowser(photos: viewerImages)
        browser.initializePageIndex(currentPageIndex)
        browser.delegate = context.coordinator
        return browser
    

    func makeCoordinator() -> Coordinator 
        Coordinator(self)
    

    func updateUIView(_ browser: SKPhotoBrowser, context: Context) 
        browser.photos = viewerImages
        browser.currentPageIndex = currentPageIndex
    

    class Coordinator: NSObject, SKPhotoBrowserDelegate 

        var control: PhotoViewer

        init(_ control: PhotoViewer) 
            self.control = control
        

        func didShowPhotoAtIndex(_ browser: PhotoViewer) 
            self.control.currentPageIndex = browser.currentPageIndex
        

    

我在这里错过了什么？

【参考方案1】：

SKPhotoBrowser 是 UIViewController 子类，因此您需要将其与 UIViewControllerRepresentable 而非 UIViewRepresentable 一致

其实差别不大：

struct PhotoViewer: UIViewControllerRepresentable 

    @Binding var viewerImages:[SKPhoto]
    @Binding var currentPageIndex: Int

    func makeUIViewController(context: Context) -> SKPhotoBrowser 
        let browser = SKPhotoBrowser(photos: viewerImages)
        browser.initializePageIndex(currentPageIndex)
        browser.delegate = context.coordinator
        return browser
    

    func makeCoordinator() -> Coordinator 
        Coordinator(self)
    

    func updateUIViewController(_ browser: SKPhotoBrowser, context: Context) 
        browser.photos = viewerImages
        browser.currentPageIndex = currentPageIndex
    

    class Coordinator: NSObject, SKPhotoBrowserDelegate 

        var control: PhotoViewer

        init(_ control: PhotoViewer) 
            self.control = control
        

        func didShowPhotoAtIndex(_ browser: PhotoViewer) 
            self.control.currentPageIndex = browser.currentPageIndex
        

    

【参考方案2】：

也许您忘记明确指定 UIViewType 的类型别名？

【讨论】：

@FilipeSá 啊，你忘了typealias UIViewControllerType