SwiftUI：如何从 macOS 上的联系人中拖放联系人

Posted 2023-05-08

【中文标题】SwiftUI：如何从 macOS 上的联系人中拖放联系人

【英文标题】：SwiftUI: How to drag and drop a contact from Contacts on macOS

【发布时间】：2021-02-11 17:56:21

【问题描述】：

我正在尝试将联系人从联系人拖到我的应用程序中。

这是我更新的代码：

import SwiftUI
import UniformTypeIdentifiers
let uttypes = [UTType.contact, UTType.emailMessage]

struct ContentView: View

    let dropDelegate = ContactDropDelegate()

    var body: some View
    
        VStack
        
            Text("Drag your contact here!")
            .padding(20)
        
        .onDrop(of: uttypes, delegate: dropDelegate)
    


struct ContactDropDelegate: DropDelegate


    func validateDrop(info: DropInfo) -> Bool
    
        return true
    
    
    func dropEntered(info: DropInfo)
    
        print ("Drop Entered")
    
    
    func performDrop(info: DropInfo) -> Bool
    
        print ("performDrop")
        NSSound(named: "Submarine")?.play()
        
        print (info)
        print ("Has UniformTypeIdentifiers:", info.hasItemsConforming(to: uttypes))
        
        let items = info.itemProviders(for: uttypes)
        print ("Number of items:",items.count)
        print (items)
        for item in items
        
            print ("item:", item)
                item.loadDataRepresentation(forTypeIdentifier: kUTTypeVCard as String, completionHandler:  (data, error) in
                if let data = data
                
                    print ("contact")
                
            )
         
        return true
    


struct ContentView_Previews: PreviewProvider 
    static var previews: some View 
        ContentView()
    

控制台输出如下：

Drop Entered
performDrop
2020-11-07 10:00:37.150359+0000 DropContact[9653:434367] [plugin] AddInstanceForFactory: No factory registered for id <CFUUID 0x600003fd9b80> F8BB1C28-BAE8-11D6-9C31-00039315CD46
DropInfo(platformDropInfo: SwiftUI.(unknown context at $7fff423616a8).DropInfo_Mac(location: (85.0618896484375, 22.804290771484375), pasteboard: <NSPasteboard: 0x600001ba6ca0>))
Has UniformTypeIdentifiers: true
Number of items: 1
[<NSItemProvider: 0x6000014a73a0> types = (
)]
item: <NSItemProvider: 0x6000014a73a0> types = (
)
2020-11-07 10:00:37.427867+0000 DropContact[9653:434367] Cannot find representation conforming to type public.vcard

所以它知道 drop 中有一个联系人，但我如何访问它？当我尝试将其取出时，它似乎为零。

【问题讨论】：

这是在 macOS 上吗？

是的，它在 macOS 上。

我已经更新了代码以包含查看问题所需的所有内容并提供完整代码。我现在也在 macOS 11 中使用 UTI。

【参考方案1】：

订阅和加载数据类型应该相同，所以这里是一个工作解决方案的演示。使用 Xcode 12.1 / macOS 10.15.7 测试

let uttypes = [String(kUTTypeVCard), String(kUTTypeEmailMessage)]

struct ContentView: View

    let dropDelegate = ContactDropDelegate()

    var body: some View
    
        VStack
        
            Text("Drag your contact here!")
            .padding(20)
        
        .onDrop(of: uttypes, delegate: dropDelegate) // << kUTTypeVCard !!
    


import Contacts

struct ContactDropDelegate: DropDelegate


    func validateDrop(info: DropInfo) -> Bool
    
        return true
    
    
    func dropEntered(info: DropInfo)
    
        print ("Drop Entered")
    
    
    func performDrop(info: DropInfo) -> Bool
    
        print ("performDrop")
        NSSound(named: "Submarine")?.play()
        
        print (info)
        print ("Has UniformTypeIdentifiers:", info.hasItemsConforming(to: uttypes))
        
        let items = info.itemProviders(for: uttypes)
        print ("Number of items:",items.count)
        print (items)

        for item in items
        
            item.loadDataRepresentation(forTypeIdentifier: kUTTypeVCard as String, completionHandler:  (data, error) in
                if let data = data, 
                   let contact = try? CNContactVCardSerialization.contacts(with: data).first
                
                    print("Contact: \(contact.givenName)")
                
            )
         
        return true
    

【讨论】：

效果很好。如果您可以扩展该答案以包括从 Apple Mail 拖放电子邮件，我将很乐意再支付一笔赏金！