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放置目标的简单示例。在 MacOS 上运行。当您从另一个应用程序（例如 Notes）拖动文本内容时，它被成功定位（即框变为绿色），但没有为实际放置公开任何类型。生成的日志消息是：

Item can't load desired type. Types registered:

这是沙盒问题吗？我感到很困惑....

import SwiftUI
import UniformTypeIdentifiers

struct DumbDrop: View {
    @State var isDropTarget: Bool = false
    func drop(items: [NSItemProvider]) -> Bool{
        var foundAny = false
        for item in items{
            if item.canLoadObject(ofClass: String.self){
                let _ = item.loadObject(ofClass: String.self){ (text, error) in
                    if let text = text{
                        logger.log("loaded: \(text)")
                    }
                    else if let error = error{
                        logger.log("error during load: \(error.localizedDescription)")
                    }
                }
                foundAny = true
            }
            else{
                logger.log("Item can't load desired type. Types registered: \(item.registeredTypeIdentifiers().joined())")
            }
        }
        return foundAny
    }
    var body: some View {
        Color(isDropTarget ? NSColor.green : NSColor.blue)
            .frame(width: 300, height: 300)
            .onDrop(of: [UTType.text.identifier], isTargeted: $isDropTarget, perform: drop)
    }
}
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