目录：

  1. 存文件
  2. 取文件
  3. 按类型存文件

1.存文件

    NSSavePanel*    panel = [NSSavePanel savePanel];
    //设置默认的文件名
    [panel setNameFieldStringValue:@"213.html"];
    //设置提示信息
    [panel setMessage:@"将网页存到哪里？"];  
    // 
    [panel   setAllowsOtherFileTypes:YES];
    //设置允许的文件类型
    [panel setAllowedFileTypes:@[@"html"]];
    //隐藏扩展名
    [panel setExtensionHidden:YES];
    //设置可以创建文件
    [panel setCanCreateDirectories:YES];
    //运行窗口
    [panel beginSheetModalForWindow:self.view.window 
    completionHandler:^(NSInteger result){
        if (result == NSFileHandlingPanelOKButton)
        {
        NSString *path = [[panel URL] path];
        //将文字存入，保存成HTML
        [@"onecodego" writeToFile:path atomically:YES 
        encoding:NSUTF8StringEncoding error:nil];
        }
    }];

屏幕快照 2016-09-01 上午11.00.46.png

2.取文件

    NSOpenPanel* openDlg = [NSOpenPanel openPanel];
    //设置默认路径
    //[openDlg setDirectory:NSOpenStepRootDirectory()];
    [openDlg setCanChooseFiles:TRUE];
    //设置可以打开文件夹
    [openDlg setCanChooseDirectories:FALSE];
    //设置是否可多选
    [openDlg setAllowsMultipleSelection:TRUE];
    [openDlg setAllowsOtherFileTypes:FALSE];
    //允许的文件类型
    [openDlg setAllowedFileTypes:@[@"png", @"PNG"]];
    
    if ([openDlg runModal] == NSModalResponseOK)
    {
        
        //用户选中的路径
        NSString* fileNameOpened = [[[openDlg URLs] objectAtIndex:0] path];
        
        NSLog(@"%@",fileNameOpened);
        
    }

屏幕快照 2016-09-01 上午11.29.52.png

3. 按类型存文件

 NSSavePanel *panel = [NSSavePanel savePanel];
    
    NSView *viewExt = [[NSView alloc] initWithFrame:NSMakeRect(0, 0, 180, 40)];
    
    NSTextField *labExt = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 10, 80, 20)];
    
    
    
    [labExt setBordered:NO];
    
    [labExt setDrawsBackground:NO];
    
    labExt.stringValue = @"Image type: ";
    
    
    
    NSComboBox *Ext = [[NSComboBox alloc] initWithFrame:NSMakeRect(80, 8, 100, 25)];
    
    [Ext addItemsWithObjectValues:@[@".bmp", @".jpg", @".png", @".tif"]];
    //默认选择第几个
    [Ext selectItemAtIndex:0];

    [viewExt addSubview:labExt];
    
    [viewExt addSubview: Ext];
    
    [panel setAccessoryView:viewExt];

    [panel runModal];

屏幕快照 2016-09-01 下午12.04.02.png