ust中UIDocumentPickerDelegate回调问题

ust中使用UIDocumentPickerDelegate代理，点击“取消”时可以触发documentPickerWasCancelled，但是选中文件时无法触发documentPicker 请问是什么问题

@objc(UTSSDKModulesIkeFileUtilMyUIDocumentPickerDelegate)  
@objcMembers  
public class MyUIDocumentPickerDelegate : NSObject, UIDocumentPickerDelegate, IUTSSourceMap {  
    public func __$getOriginalPosition() -> UTSSourceMapPosition? {  
        return UTSSourceMapPosition("MyUIDocumentPickerDelegate", "uni_modules/ike-file-util/utssdk/app-ios/index.uts", 63, 7);  
    }  
    public var resultCallback: ((_ res: [String]) -> Void)?;  
    public func documentPicker(_ controller: UIDocumentPickerViewController, _ urls: [URL]) -> Void {  
        console.log("确定选择文件", " at uni_modules/ike-file-util/utssdk/app-ios/index.uts:97");  
        controller.dismiss(animated: true, completion: nil);  
    }  
    public func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) -> Void {  
        console.log("取消选择文件", " at uni_modules/ike-file-util/utssdk/app-ios/index.uts:113");  
        controller.dismiss(animated: true, completion: nil);  
    }  
}  
@objc(UTSSDKModulesIkeFileUtilNativeCode)  
@objcMembers  
public class NativeCode : UIViewController, UIDocumentPickerDelegate {  
    private static var myDelegate = MyUIDocumentPickerDelegate();  
    public func showPicker(_ options: ChooseFileOptions) {  
        NativeCode.myDelegate.resultCallback = options.success;  
        var uiDocumentPickerViewController: UIDocumentPickerViewController = UIDocumentPickerViewController(documentTypes: options.mime_types, in: UIDocumentPickerMode.import);  
        uiDocumentPickerViewController.delegate = NativeCode.myDelegate;  
        if #available(iOS 13.0, *) {  
            uiDocumentPickerViewController.shouldShowFileExtensions = true;  
        }  
        UTSiOS.getCurrentViewController().present(uiDocumentPickerViewController, animated: true, completion: nil);  
    }  
}  
public var chooseFile: ChooseFile = {  
(_ options: ChooseFileOptions) -> Void in  
DispatchQueue.main.async(execute: {  
() -> Void in  
var nativeCode = NativeCode();  
nativeCode.showPicker(options);  
});  
};