使用UIDocumentPickerViewController时没有回调

Question

我使用UIDocumentPickerViewController从iPhone中选择一个文档。

我以以下方式实现了这个特性。

class Si3EntityDocumentViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, UIDocumentInteractionControllerDelegate, UIDocumentPickerDelegate, UINavigationControllerDelegate, UIDocumentMenuDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        setLoader()
        getDocuments(id:entity.id)
        let button = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
        button.backgroundColor = .red
        button.setTitle("Upload Doc", for: .normal)
        button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
        self.view.addSubview(button)
        // Do any additional setup after loading the view.
    }

    @objc func buttonAction(sender: UIButton!){
        let documentPicker = UIDocumentPickerViewController(documentTypes: [String(kUTTypeText),String(kUTTypeContent),String(kUTTypeItem),String(kUTTypeData)], in: .import)
        documentPicker.delegate = self
        present(documentPicker, animated: true, completion: {
            documentPicker.delegate = self
        } )
    }

    func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
        print(urls)
    }

}

func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt url: URL)方法在iOS 11中被废弃，所以我用func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL])替换了它

出于某种原因，我无法在func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL])中得到回调

这个类中还有一些其他代码，但我没有包括它。选择文档或单击“取消”时，控制台中会出现以下错误

DocumentManager视图服务终止时出现了错误: Domain=_UIViewServiceErrorDomain Code=1 "(null)“UserInfo={Terminated=disconnect方法}

我知道我错过了一些很愚蠢的东西，任何帮助都是值得感激的。

感谢你的期待。

Answer 1

您可以查看苹果文档以获得更好的理解。

UIDocumentPickerViewController的默认行为是选择一个文档，您必须使用：

func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL) {
}

如果使用allowsMultipleSelection选择多个文档，则必须将UIDocumentPickerViewController属性设置为true并实现

func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) {
}

另外，下面一行就足够了。

present(documentPicker, animated: true)

Answer 2

试试看一个装置。当我登录到iCloud并试图查看目录时，模拟器没有为我工作。