Mac OS AppKit文档翻译——NSOpenPanel

NSPanel

The NSPanel class implements a special kind of window (known as a panel), typically performing an auxiliary function.

NSPanel类是一种特殊的window类，主要用于实现一些辅助功能。

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NSOpenPanel

The NSOpenPanel class provides the Open panel for the Cocoa user interface. Applications use the Open panel as a convenient way to query the user for the name of a file to open.

NSOpenPanel类为Cocoa用户界面提供打开面板的操作。应用使用面板作为一种便捷方式，询问用户需要打开的文件名。

Overview

In a sandboxed environment, Open panels are drawn in a separate process by the powerbox, not by AppKit itself. When the user chooses a file to open, macOS adds that file to the app’s sandbox.

在沙盒环境里，电源箱将面板拖进一个单独的进程。当用户选择打开一个文件时，macOS系统会将这个文件添加到app沙盒里。

var canChooseFiles: Bool

A Boolean that indicates whether the panel allows the user to choose files to open.

canChooseFiles——布尔值，表示面板是否允许用户选择打开文件。

var canChooseDirectories: Bool

A Boolean that indicates whether the panel allows the user to choose directories to open.

canChooseDirectories——布尔值，表示面板是否允许用户选择打开文件夹。

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使用示例代码：

```

- (IBAction)push:(NSButton *)sender

{

NSOpenPanel *panel = [NSOpenPanel openPanel];

panel.canChooseFiles = YES;

[panel beginSheetModalForWindow:_window completionHandler:^(NSInteger result)

{

if (result == NSModalResponseOK)

{

NSArray *urls = panel.URLs;

for (NSURL *url in urls)

{

NSLog(@"url = %@",url);//选择文件的本地路径

NSString *str_FilePath = [NSString stringWithFormat:@"%@",url];

self.TF_ShowFilePath.stringValue = [str_FilePath substringFromIndex:7];

}

}

}];

NSLog(@"openPanel");

}

```

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