NSOpenPanel setAllowedFileTypes [英] NSOpenPanel setAllowedFileTypes

问题描述

我有一个NSOpenPanel.但是我想使它只能选择PDF文件.我正在寻找类似的东西:

I have a NSOpenPanel. But I want to make it PDF-files selectable only. I'm looking for something like that:

// NOT WORKING 
NSOpenPanel *panel;

panel = [NSOpenPanel openPanel];
[panel setFloatingPanel:YES];
[panel setCanChooseDirectories:YES];
[panel setCanChooseFiles:YES];
[panel setAllowsMultipleSelection:YES];
[panel setAllowedFileTypes:[NSArray arrayWithObject:@"pdf"]];
int i = [panel runModalForTypes:nil];
if(i == NSOKButton){
    return [panel filenames];
}

我希望someboby有解决方案.

I hope someboby has a solution.

推荐答案

我注意到了几件事..将setCanChooseDirectories更改为NO.启用后，表明文件夹是有效输入.这很可能不是您想要的功能.对于区分大小写的系统，您可能还希望将允许的文件类型更改为[NSArray arrayWithObject:@"pdf", @"PDF", nil]. runModalForTypes应该是文件类型的数组.更改代码，使其看起来像这样:

A couple things I noticed.. change setCanChooseDirectoriesto NO. When enabled this indicates that folders are valid input. This is most likely not the functionality you want. You might also want to change your allowed file types to [NSArray arrayWithObject:@"pdf", @"PDF", nil] for case sensitive systems. runModalForTypes should be the array of file types. Change your code to look like this:

// WORKING :)
NSOpenPanel *panel;
NSArray* fileTypes = [NSArray arrayWithObjects:@"pdf", @"PDF", nil];
panel = [NSOpenPanel openPanel];
[panel setFloatingPanel:YES];
[panel setCanChooseDirectories:NO];
[panel setCanChooseFiles:YES];
[panel setAllowsMultipleSelection:YES];
[panel setAllowedFileTypes:fileTypes];
int i = [panel runModal];
if(i == NSOKButton){
    return [panel URLs];
}

雨燕4.2:

let fileTypes = ["jpg", "png", "jpeg"]
let panel = NSOpenPanel()
panel.canChooseFiles = true
panel.canChooseDirectories = false
panel.allowsMultipleSelection = false
panel.allowedFileTypes = fileTypes
panel.beginSheetModal(for: window) { (result) in
    if result.rawValue == NSApplication.ModalResponse.OK.rawValue {
         // Do something with the result.
         let selectedFolder = panel.urls[0]
         print(selectedFolder)
    }
}

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