Multi-type Save Panel Controller

As a change of pace, I thought I’d post some code that doesn’t go out of its way to be bad.

JAMultiTypeSavePanelController is a class (abstracted from ImageIO Export for Acorn) to handle the case where you want to offer the user a choice of formats to save in.

It wraps an NSSavePanel and handles all the UTI and extension details. You can provide a customised NSSavePanel or let the controller create one. The only restriction is that the controller appropriates the accessory view. Usage is similar to NSSavePanel itself:

NSArray *types =
    [NSArray arrayWithObjects:@"com.apple.rtfd", @"public.rtf", @"public.plain-text", nil];
JAMultiTypeSavePanelController *controller =
    [JAMultiTypeSavePanelController controllerWithSupportedUTIs:types];
controller.autoSaveSelectedUTIKey = @"document format"; // Optional: preferences key for selected type.
controller.sortTypesByName = NO; // Optional: show in specified order instead of alphabetically by display name.

[controller beginSheetForDirectory:nil
                              file:@"untitled 42"
                    modalForWindow:docWindow
                     modalDelegate:self
                    didEndSelector:@selector(savePanelDidEnd:returnCode:contextInfo:)
                       contextInfo:nil];

-runModalForDirectory:file: is also supported.

Code (MIT/X11 license)