Bundles are a convenient way to deliver software in macOS and iOS. Bundles provide a simplified interface for end users and at the same time provide support for development. This chapter provides an introduction to bundles and discusses the role they play in macOS and iOS.

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Bundles and Packages

Although bundles and packages are sometimes referred to interchangeably, they actually represent very distinct concepts:

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• A package is any directory that the Finder presents to the user as if it were a single file.

• A bundle is a directory with a standardized hierarchical structure that holds executable code and the resources used by that code.

Packages provide one of the fundamental abstractions that makes macOS easy to use. If you look at an application or plug-in on your computer, what you are actually looking at is a directory. Inside the package directory are the code and resource files needed to make the application or plug-in run. When you interact with the package directory, however, the Finder treats it like a single file. This behavior prevents casual users from making changes that might adversely affect the contents of the package. For example, it prevents users from rearranging or deleting resources or code modules that might prevent an application from running correctly.

Loadable bundles usually have the extension.bundle, and are most often used as plug-ins. On macOS, there is a way to load bundles even into applications that do not support them, allowing for third party hacks for popular applications, such as Safari and Apple Mail.

Note: Even though packages are treated as opaque files by default, it is still possible for users to view and modify their contents. On the contextual menu for package directories is a Show Package Contents command. Selecting this command displays a new Finder window set to the top level of the package directory. The user can use this window to navigate the package's directory structure and make changes as if it were a regular directory hierarchy.

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Whereas packages are there to improve the user experience, bundles are geared more toward helping developers package their code and to helping the operating system access that code. Bundles define the basic structure for organizing the code and resources associated with your software. The presence of this structure also helps facilitate important features such as localization. The exact structure of a bundle depends on whether you are creating an application, framework, or plug-in. It also depends on other factors such as the target platform and the type of plug-in.

The reason bundles and packages are sometimes considered to be interchangeable is that many types of bundles are also packages. For example, applications and loadable bundles are packages because they are usually treated as opaque directories by the system. However, not all bundles are packages and vice versa.

How the System Identifies Bundles and Packages

The Finder considers a directory to be a package if any of the following conditions are true:

• The directory has a known filename extension: .app, .bundle, .framework, .plugin, .kext, and so on.

• The directory has an extension that some other application claims represents a package type; see Document Packages.

• The directory has its package bit set.

The preferred way to specify a package is to give the package directory a known filename extension. For the most part, Xcode takes care of this for you by providing templates that apply the correct extension. All you have to do is create an Xcode project of the appropriate type.

Most bundles are also packages. For example, applications and plug-ins are typically presented as a single file by the Finder. However, this is not true for all bundle types. In particular, a framework is a type of bundle that is treated as a single unit for the purposes of linking and runtime usage, but framework directories are transparent so that developers can view the header files and other resources they contain.

About Bundle Display Names

Display names give the user some control over how bundles and packages appear in the Finder without breaking clients that rely on them. Whereas a user can rename a file freely, renaming an application or framework might cause related code modules that refer to the application or framework by name to break. Therefore, when the user changes the name of a bundle, the change is superficial only. Rather than change the bundle name in the file system, the Finder associates a separate string (known as the display name) with the bundle and displays that string instead.

Display names are for presentation to the user only. You never use display names to open or access directories in your code, but you do use them when displaying the name of the directory to the user. By default, a bundle’s display name is the same as the bundle name itself. However, the system may alter the default display name in the following cases:

• If the bundle is an application, the Finder hides the .app extension in most cases.

• If the bundle supports localized display names (and the user has not explicitly changed the bundle name), the Finder displays the name that matches the user’s current language settings.

Although the Finder hides the .app extension for applications most of the time, it may display it to prevent confusion. For example, if the user changes the name of an application and the new name contains another filename extension, the Finder shows the .app. extension to make it clear that the bundle is an application. For example, if you were to add the .mov extension to the Chess application, the Finder would display Chess.mov.app to prevent users from thinking Chess.mov is a QuickTime file.

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For more information about display names and specifying localized bundle names, see File System Overview.

The Advantages of Bundles

Bundles provide the following advantages for developers:

• Because bundles are directory hierarchies in the file system, a bundle just contains files. Therefore, you can use all of the same file-based interfaces to open your bundle resources as you do to open other types of files.

• The bundle directory structure makes it easy to support multiple localizations. You can easily add new localized resources or remove unwanted ones.

• Bundles can reside on volumes of many different formats, including multiple fork formats like HFS, HFS+, and AFP, and single-fork formats like UFS, SMB, and NFS.

• Users can install, relocate, and remove bundles simply by dragging them around in the Finder.

• Bundles that are also packages, and are therefore treated as opaque files, are less susceptible to accidental user modifications, such as removal, modification, or renaming of critical resources.

• Best retirement planning software for macos. A bundle can support multiple chip architectures (PowerPC, Intel) and different address space requirements (32-bit/64-bit). It can also support the inclusion of specialized executables (for example, libraries optimized for a particular set of vector instructions).

• Most (but not all) executable code can be bundled. Applications, frameworks (shared libraries), and plug-ins all support the bundle model. Static libraries, dynamic libraries, shell scripts, and UNIX command line tools do not use the bundle structure.

• A bundled application can run directly from a server. No special shared libraries, extensions, and resources need to be installed on the local system.

Types of Bundles

Although all bundles support the same basic features, there are variations in the way you define and create bundles that define their intended usage:

• Application - An application bundle manages the code and resources associated with a launchable process. The exact structure of this bundle depends on the platform (iOS or macOS) that you are targeting. For information about the structure of application bundles, see Application Bundles.

• Frameworks - A framework bundle manages a dynamic shared library and its associated resources, such as header files. An application can link against one or more frameworks to take advantage of the code they contain. For information about the structure of framework bundles, see Anatomy of a Framework Bundle.

• Plug-Ins - macOS supports plug-ins for many system features. Plug-ins are a way for an application to load custom code modules dynamically. The following list identifies some of the key types of plug-ins you might want to develop:

  • Custom plug-ins are plug-ins you define for your own purposes; see Anatomy of a Loadable Bundle.

  • Image Unit plug-ins add custom image-processing behaviors to the Core Image technology; see Image Unit Tutorial.

  • Interface Builder plug-ins contain custom objects that you want to integrate into Interface Builder’s library window.

  • Preference Pane plug-ins define custom preferences that you want to integrate into the System Preferences application; see Preference Pane Programming Guide.

  • Quartz Composer plug-ins define custom patches for the Quartz Composer application; see Quartz Composer Custom Patch Programming Guide.

  • Quick Look plug-ins support the display of custom document types using Quick Look; see Quick Look Programming Guide.

  • Spotlight plug-ins support the indexing of custom document types so that those documents can be searched by the user; see Spotlight Importer Programming Guide.

  • WebKit plug-ins extend the content types supported by common web browsers.

  • Widgets add new HTML-based applications to Dashboard.

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Although document formats can leverage the bundle structure to organize their contents, documents are generally not considered bundles in the purest sense. A document that is implemented as a directory and treated as an opaque type is considered to be a document package, regardless of its internal format. For more information about document packages, see Document Packages.

Creating a Bundle

For the most part, you do not create bundles or packages manually. When you create a new Xcode project (or add a target to an existing project), Xcode automatically creates the required bundle structure when needed. For example, the application, framework, and loadable bundle targets all have associated bundle structures. When you build any of these targets, Xcode automatically creates the corresponding bundle for you.

Note: Some Xcode targets (such as shell tools and static libraries) do not result in the creation of a bundle or package. This is normal and there is no need to create bundles specifically for these target types. The resulting binaries generated for those targets are intended to be used as is.

If you use make files (instead of Xcode) to build your projects, there is no magic to creating a bundle. A bundle is just a directory in the file system with a well-defined structure and a specific filename extension added to the end of the bundle directory name. As long as you create the top-level bundle directory and structure the contents of your bundle appropriately, you can access those contents using the programmatic support for accessing bundles. For more information on how to structure your bundle directory, see Bundle Structures.

Programmatic Support for Accessing Bundles

Programs that refer to bundles, or are themselves bundled, can take advantage of interfaces in Cocoa and Core Foundation to access the contents of a bundle. Using these interfaces you can find bundle resources, get information about the bundle’s configuration, and load executable code. In Objective-C applications, you use the NSBundle class to get and manage bundle information. For C-based applications, you can use the functions associated with the CFBundleRef opaque type to manage a bundle.

Note: Unlike many other Core Foundation and Cocoa types, NSBundle and CFBundleRef are not toll-free bridged data types and cannot be used interchangeably. However, you can extract the bundle path information from either object and use it to create the other.

For information about how to use the programmatic support in Cocoa and Core Foundation to access bundles, see Accessing a Bundle's Contents.

Guidelines for Using Bundles

Bundles are the preferred organization mechanism for software in macOS and iOS. The bundle structure lets you group executable code and the resources to support that code in one place and in an organized way. The following guidelines offer some additional advice on how to use bundles:

• Always include an information-property list (Info.plist) file in your bundle. Make sure you include the keys recommended for your bundle type. For a list of all keys you can include in this file, see Runtime Configuration Guidelines.

• If an application cannot run without a specific resource file, include that file inside the application bundle. Applications should always include all of the images, strings files, localizable resources, and plug-ins that they need to operate. Noncritical resources should similarly be stored inside the application bundle whenever possible but may be placed outside the bundle if needed. For more information about the bundle structure of applications, see Application Bundles.

• If you plan to load C++ code from a bundle, you might want to mark the symbols you plan to load as extern “C”. Neither NSBundle nor the Core Foundation CFBundleRef functions know about C++ name mangling conventions, so marking your symbols this way can make it much easier to identify them later.

• You cannot use the NSBundle class to load Code Fragment Manager (CFM) code. If you need to load CFM-based code, you must use the functions for the CFBundleRef or CFPlugInRef opaque types. You may load CFM-based plugins from a Mach-O executable using this technique.

• You should always use the NSBundle class (as opposed to the functions associated with the CFBundleRef opaque type) to load any bundle containing Java code.

• When loading bundles containing Objective-C code, you may use either the NSBundle class or the functions associated with the CFBundleRef opaque type in macOS v10.5 and later, but there are differences in behavior for each. If you use the Core Foundation functions to load a plug-in or other loadable bundle (as opposed to a framework or dynamic shared library), the functions load the bundle privately and bind its symbols immediately; if you use NSBundle, the bundle is loaded globally and its symbols are bound lazily. In addition, bundles loaded using the NSBundle class cause the generation of NSBundleDidLoadNotificationnotifications, whereas those loaded using the Core Foundation functions do not.

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In NeXTSTEP, OPENSTEP, GNUstep, and their lineal descendants macOS and iOS, a bundle is a file directory with a defined structure and file extension, allowing related files to be grouped together as a conceptually single item.

Examples of bundles that contain executable code include applications, frameworks, and plugins. This kind of bundle usually contains one file representing executable code, and files that represent resources such as nibs, templates, images, sounds, and other media. On some other systems, such as Microsoft Windows, these resources are usually included directly in the executable file itself at compile time. On older Macintoshes, a similar technique is used, where additional metadata can be added to a file's resource fork. Similar in concept are the application directories used in RISC OS and on the ROX Desktop.

Examples of bundles that do not contain executable code include document packages (iWork documents) and media libraries (iPhoto Library).

Bundles are programmatically accessed with the NSBundle class in Cocoa, NeXTSTEP and GNUstep's Foundation frameworks, and with CFBundle in Core Foundation. Bundles often include an Info.plist file for metadata.^[1] The Uniform Type Identifier (UTI) for an Apple bundle is com.apple.bundle.^[2]

Application bundles[edit]

Application bundles are directory hierarchies, with the top-level directory having a name that ends with a .app extension. In an application bundle, the first directory in the bundle underneath the top-level directory is usually named Contents. Within Contents there is usually another directory (called MacOS on Macs), which contains the application's executable code. Within the Contents folder there is usually also a directory called Resources, which contains the resources of the application.

Among other things, the Resources folder contains localized versions of the application's nib files.

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Other common subdirectories include Plugins, Frameworks, and Shared Frameworks. The Frameworks directory contains frameworks used by the application, and are used even if another version of the framework exists on the system. The Shared Frameworks directory contains frameworks that can be used both by the application that contains them, and other applications; they are used only if a newer version does not exist elsewhere on the system. Plugins contains extensible code used by the application.

By default, the Finder displays application bundles, which can also be referred to as packages, as opaque files with no underlying structure; the contents of the bundle can be shown with the 'Show Package Contents' context menu item.

GNUstep by default uses the name of the application to name the folder that contains application code. An alternative is to name them by the computer architecture and OS the code is intended for to form a fat binary, so the application can be opened on many platforms.^[3][4]

macOS framework bundles[edit]

macOS frameworks are also stored as bundles; the top-level directory of a framework bundle has a name that is the name of the framework followed by the extension .framework. In the top-level directory is a Versions directory, with subdirectories for one or more versions of the framework, each subdirectory containing the dynamic library code for the framework, in a file whose name is the same as the name of the framework, possibly with a Headers folder containing header files for the framework, and other subfolders such as Resources. The Versions directory also contains a symbolic link Current to the directory for the current version of the framework. In the top-level directory are symbolic links to the contents of Versions/Current.^[5]

The Finder displays framework bundles as directories rather than as opaque files.

Although GNUstep uses frameworks, they are not usually stored as bundles. This is because the full semantics of framework loading are considered too alien to other platforms.^[6]

Loadable bundles[edit]

Loadable bundles are bundles which contain code that can be loaded at runtime.^[7] Loadable bundles usually have the extension .bundle, and are most often used as plug-ins. On macOS, there is a way to load bundles even into applications that do not support them, allowing for third party hacks for popular applications, such as Safari^[8] and Apple Mail.^[9][10] A feature inherited from NeXTSTEP, GNUstep has the -[NSBundle principalClass] interface too.

By default, the Finder displays loadable bundles, which can also be referred to as packages, as opaque files with no underlying structure; the contents of the bundle can be shown with the 'Show Package Contents' context menu item.

Other bundle formats[edit]

There are many third-party macOS applications which utilize their own custom bundle format (e.g. CandyBar.iContainer, Aperture.aplibrary, VMware Fusion.vmwarevm, etc.).

.lproj[edit]

An .lproj file is a bundle that contains localization files for OpenStep, macOS, or GNUstep software. It typically contains the .nib files for a given language along with .strings files and images if needed (for example, ReadMe or license files). These localized files are used by installer makers to customize install packages. They are also included in an application bundle.

See also[edit]

• Application Directory — the RISC OS analogue to an application bundle
• AppImage — A Linux application that makes use of similar principles

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References[edit]

1. ^'Information Property List - Bundle Resources'. Apple Developer Documentation.
2. ^'System-Declared Uniform Type Identifiers'. Uniform Type Identifiers Reference. Apple Inc. Retrieved 2012-06-10.
3. ^'PackagingDrafts/GNUstep'. Fedora Project Wiki.
4. ^'gnustep/tools-make: README.Packaging'. GitHub.
5. ^'Anatomy of Framework Bundles'. Apple Inc. Retrieved 2011-09-03.
6. ^'User FAQ'. GNUstep.
7. ^Code Loading Programming Topics for Cocoa: About Loadable Bundles
8. ^'Pimp My Safari: plugins'. Archived from the original on 2007-10-31.
9. ^'Apple Mail plug-ins and tools'.
10. ^'Hawk Wings — Plug-ins for Apple Mail'. Archived from the original on 2007-08-31.

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External links[edit]

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• Bundle Programming Guide at Apple Developer Connection
• NSBundle documentation from the GNUstep project
• Platypus — a tool to create application bundles around scripts