NSOpenPanel - 一切都弃用了吗？

Question

我一直试图让一个窗口出现，让人们选择一个文件，我最终做到了。问题是，Xcode 抱怨我使用的方法已被弃用。我查看了class reference，但从 Mac OS 10.6 开始，“运行面板”部分下的所有内容都已被弃用。我现在应该使用不同的课程吗？

Answer 1

在 10.6 中，对此类进行了一些更改。好处之一是现在有了基于块的 API。

这是一个关于如何使用它的代码 sn-p：

NSOpenPanel *panel = [[NSOpenPanel openPanel] retain];

// Configure your panel the way you want it
[panel setCanChooseFiles:YES];
[panel setCanChooseDirectories:NO];
[panel setAllowsMultipleSelection:YES];
[panel setAllowedFileTypes:[NSArray arrayWithObject:@"txt"]];

[panel beginWithCompletionHandler:^(NSInteger result){
    if (result == NSFileHandlingPanelOKButton) {

        for (NSURL *fileURL in [panel URLs]) {
            // Do what you want with fileURL
            // ...
        }
    }

    [panel release];
}];

Answer 2

据我所知，您可以使用如下所示的runModal 方法：

NSOpenPanel *openPanel = [[NSOpenPanel alloc] init];

if ([openPanel runModal] == NSOKButton)
{
    NSString *selectedFileName = [openPanel filename];
}

Answer 3

六年后我发现这个问题很有用，由于没有快速的答案，这里有一个快速的解决方案。

您会找到两个示例，一个作为独立窗口，另一个作为工作表。

Swift 3.0

func selectIcon() {
    // create panel
    let panel = NSOpenPanel()

    // configure as desired
    panel.canChooseFiles = true
    panel.canChooseDirectories = false
    panel.allowsMultipleSelection = false
    panel.allowedFileTypes = ["png"]

    // *** ONLY USE ONE OF THE FOLLOWING OPTIONS, NOT BOTH ***

    // ********************** OPTION 1 ***********************
    // use this if you want a selection window to display that is
    // displayed as a separate stand alone window
    panel.begin { [weak self] (result) in
        guard result == NSFileHandlingPanelOKButton, panel.urls.isEmpty == false, let url = panel.urls.first else {
            return
        }

        let image = NSImage.init(contentsOf: url)
        DispatchQueue.main.async {
            self?.iconImageView.image = image
        }
    }

    // ********************** OPTION 2 ***********************        
    // use this if you want a sheet style view that displays sliding
    // down from your apps window
    panel.beginSheetModal(for: self.view.window!) { [weak self] (result) in
        guard result == NSFileHandlingPanelOKButton, panel.urls.isEmpty == false, let url = panel.urls.first else {
            return
        }

        let image = NSImage.init(contentsOf: url)
        DispatchQueue.main.async {
            self?.iconImageView.image = image
        }
    }
}