Swift 中的 NSOpenPanel。 如何打開？

Question

我有這個 Objective-C 代碼：

- (IBAction)selectFileButtonAction:(id)sender {

    //create open panel...
    NSOpenPanel* openPanel = [NSOpenPanel openPanel];
    // NSLog(@"Open Panel");
    //set restrictions / allowances...
    [openPanel setAllowsMultipleSelection: NO];
    [openPanel setCanChooseDirectories:NO];
    [openPanel setCanCreateDirectories:NO];
    [openPanel setCanChooseFiles:YES];
    //only allow images...
    [openPanel setAllowedFileTypes:[NSImage imageFileTypes]];
    //open panel as sheet on main window...
    [openPanel beginWithCompletionHandler:^(NSInteger result)  {
        if (result == NSFileHandlingPanelOKButton) {

            //get url (should only be one due to restrictions)...
            for( NSURL* URL in [openPanel URLs] ) {
               // self.roundClockView1.URL = URL ;
                _thePath = URL;
                currentSelectedFileName = [[URL path] lastPathComponent];
               // [_roundClockView1 setNeedsDisplay:1];
                [self openEditor];
            }

        }
    }];

現在我想用 swift 寫同樣的東西。 這是我到目前為止所做的：

@IBAction func selectAnImageFromFile(sender: AnyObject) {
    var openPanel = NSOpenPanel()
    openPanel.allowsMultipleSelection = false
    openPanel.canChooseDirectories = false
    openPanel.canCreateDirectories = false
    openPanel.canChooseFiles = true
    openPanel.beginWithCompletionHandler(handler: (Int) -> Void)
}

我被卡住了。 感謝幫助。

Answer 1

@IBAction func selectAnImageFromFile(sender: AnyObject) {
    let openPanel = NSOpenPanel()
    openPanel.allowsMultipleSelection = false
    openPanel.canChooseDirectories = false
    openPanel.canCreateDirectories = false
    openPanel.canChooseFiles = true
    openPanel.beginWithCompletionHandler { (result) -> Void in
        if result == NSFileHandlingPanelOKButton {
            //Do what you will
            //If there's only one URL, surely 'openPanel.URL'
            //but otherwise a for loop works
        }
    }
}

我猜你被困在完成處理程序部分？ 在任何情況下，從打開面板處理 URL 應該沒問題，但如果您希望我添加更多，請發表評論。 :)

Answer 2

對於 Swift 4，響應的檢查應該是

if response == .OK { 
  ... 
}

Answer 3

我 swift 5.0 的兩分錢

override func showChooseFileDialog(title: String){
    let openPanel = NSOpenPanel()
    openPanel.canChooseFiles = false
    openPanel.allowsMultipleSelection = false
    openPanel.canChooseDirectories = false
    openPanel.canCreateDirectories = false
    openPanel.title = title

    openPanel.beginSheetModal(for:self.view.window!) { (response) in
        if response == .OK {
            let selectedPath = openPanel.url!.path
            // do whatever you what with the file path
        }
        openPanel.close()
    }
}

Answer 4

斯威夫特 4 版本：

let openPanel = NSOpenPanel()
        openPanel.canChooseFiles = false
        openPanel.allowsMultipleSelection = false
        openPanel.canChooseDirectories = false
        openPanel.canCreateDirectories = false
        openPanel.title = "Select a folder"

        openPanel.beginSheetModal(for:self.view.window!) { (response) in
            if response.rawValue == NSFileHandlingPanelOKButton {
                let selectedPath = openPanel.url!.path
                // do whatever you what with the file path
            }
            openPanel.close()
        }

Answer 5

NSOpenPanel | 蘋果開發者文檔https://developer.apple.com/documentation/appkit/nsopenpanel

斯威夫特5

@objc func changeConfigFolder() {
    let openPanel = NSOpenPanel()
    openPanel.canChooseFiles = false
    openPanel.allowsMultipleSelection = false
    openPanel.canChooseDirectories = true
    openPanel.canCreateDirectories = true
    openPanel.title = NSLocalizedString("change_the_folder", comment: "")

    openPanel.begin { [weak self] (result) -> Void in
        if result == .OK {
            let selectedPath = openPanel.url!.path
            if var userSetting = self?.userSetting {
                userSetting["save_path"] = selectedPath
                UserDefaults.standard.set(userSetting, forKey: "config")
                self?.resetStatusBar()
            }
        } else {
            openPanel.close()
        }
    }
}
    

Answer 6

在 SwiftUI 中

    struct FileView: View {
    var body: some View {
        Button("Press Me") {
            let openPanel = NSOpenPanel()
            openPanel.prompt = "Select File"
            openPanel.allowsMultipleSelection = false
                openPanel.canChooseDirectories = false
                openPanel.canCreateDirectories = false
                openPanel.canChooseFiles = true
                openPanel.begin { (result) -> Void in
                    if result.rawValue == NSApplication.ModalResponse.OK.rawValue {
                        let selectedPath = openPanel.url!.path
                        print(selectedPath)

                    }
                }
           }
        }
     }