swift 使用UIDropInteractionDelegate和影片

xuo3flqw 于 2022-12-10 发布在 Swift

关注(0)|答案(3)|浏览(143)

我试图实现拖放照片和视频到我的应用程序。
我已经使照片工作使用下面的代码

public func dropInteraction(_ interaction: UIDropInteraction, canHandle session: UIDropSession) -> Bool {
    return session.hasItemsConforming(toTypeIdentifiers:
        [kUTTypeImage as String, kUTTypeMovie as String]) &&
        session.items.count == 1
}
public func dropInteraction(_ interaction: UIDropInteraction, sessionDidUpdate
    session: UIDropSession) -> UIDropProposal {
    let dropOperation: UIDropOperation?
    if session.canLoadObjects(ofClass: UIImage.self) {
        //Make sure over drop space
    }
    else
    {
        dropOperation = .forbidden
    }
    return UIDropProposal(operation: dropOperation!)
}
public func dropInteraction(_ interaction: UIDropInteraction,
                            performDrop session: UIDropSession) {
    if session.canLoadObjects(ofClass: UIImage.self) {
        session.loadObjects(ofClass: UIImage.self) { (items) in
            if let images = items as? [UIImage] {
                //Do something with the image file
            }
        }
    }
}

正如我所说，照片工作完美，但我不确定该如何处理视频（kUTTypeMovie），什么类类型是“session.canLoadObjects（ofClass：用户界面图像.self）”
谢谢

swift

来源：https://stackoverflow.com/questions/56894917/using-uidropinteractiondelegate-and-movies

3条答案

按热度按时间

f3temu5u1#

您可以使用itemProvidersloadFileRepresentation获取电影文件的URL，如下所示

for item in session.items {
    if item.itemProvider.hasItemConformingToTypeIdentifier(kUTTypeMovie as String) {
        item.itemProvider.loadFileRepresentation(forTypeIdentifier: kUTTypeMovie as String) { (url, error) in
                
             // Copy the file to your documents directory before using it
            
        }
    }
}

记住还要将kuTTypeMovie添加到canHandle函数中

func dropInteraction(_ interaction: UIDropInteraction, canHandle session: UIDropSession) -> Bool {
    return session.hasItemsConforming(toTypeIdentifiers: [kUTTypeMovie as String])
}

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svmlkihl2#

2022 ...类型标识符的语法已更改：

func dropInteraction(_ i: UIDropInteraction, canHandle s: UIDropSession) -> Bool {
    guard s.items.count == 1 else { return false }
    return s.hasItemsConforming(
     toTypeIdentifiers: [UTType.image.identifier, UTType.video.identifier])
}

您需要：

import UniformTypeIdentifiers

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llycmphe3#

为了添加到@torof的解决方案中，我完成了他在代码注解中提到的复制部分。作为文件目标，我使用.cachesDirectory，因为我不想永久存储文件，而只是为了在此会话中使用，就在回调之外。这样，当需要空间时，操作系统会自动清理它。

session.items.filter { $0.itemProvider.hasItemConformingToTypeIdentifier(UTType.movie.identifier) }.forEach { item in
    item.itemProvider.loadFileRepresentation(forTypeIdentifier: UTType.movie.identifier) { [weak self] (videoURL, error) in
        guard let url = videoURL,
              let documentsURL = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask).first else { return }
        let destURL = documentsURL.appendingPathComponent(url.lastPathComponent)
        try? FileManager.default.copyItem(at: url, to: destURL)
        
        // the file is now at destURL
        // you may us it now outside of the callback
    }
}

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我来回答

swift 使用UIDropInteractionDelegate和影片

3条答案

2022 ...类型标识符的语法已更改：

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