How To Go To System Library On Mac

Photos in your System Photo Library are available in apps like iMovie, Pages, and Keynote. You can also sync them to iOS devices and view them on Apple TV. And if you want to use your own images as your desktop picture or screen saver, the images need to be in your System Photo Library before you can select them in System Preferences.

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If you have only one photo library, then it's the System Photo Library. Otherwise, the first photo library that you create or open in Photos will become the System Photo Library. If you have more than one library, you might need to designate a System Photo Library, so other apps can access the photos and videos you want them to use.

Follow these steps to designate a System Photo Library:

Quit Photos.
Hold down the Option key and open Photos. One of the photo libraries is already designated as YourLibraryName (System Photo Library).
Choose the library you want to designate as the System Photo Library.
After Photos opens the library, choose Photos > Preferences from the menu bar.
Click the General tab.
Click the Use as System Photo Library button.

2020-4-6 Access Library Folder On Mac. The Library Folder on your Mac contains Preference Files, Caches, and Application Support Data. While regular Mac users may not find the need to access the Hidden Library Folder, advanced Mac users will at times come across the need to access files inside the Library Folder for troubleshooting and other purposes.

If you open a second or different library in the Photos app, and you haven't designated it as the System Photo Library, other applications will use photos from the original System Photo Library. Hold down the Option key when you open Photos to see which library is set as the System Photo Library.

iCloud and the System Photo Library

You can use iCloud Photos, Shared Albums, and My Photo Stream only with the System Photo Library. If you choose a different library in Photos without designating it as the System Photo Library, the iCloud tab in Photos preferences is disabled:

If you designate a new library as the System Photo Library and then turn on iCloud Photos, the photos and videos in the new library will merge with those already in your iCloud Photos. If you want to keep the contents of your photo libraries separate, don’t turn on iCloud Photos for more than one library in Photos.

The Library directories are where the system and your code store all of their related data and resources. In macOS, this directory can contain many different subdirectories, most of which are created automatically by the system. In iOS, the app installer creates only a few subdirectories in ~/Library (such as Caches and Preferences) and your app is responsible for creating all others.

How To View System Library On Mac

Table A-1 lists some of the common subdirectories you might find in a Library directory in macOS along with the types of files that belong there. You should always use these directories for their intended purposes. For information about the directories your app should be using the most, see The Library Directory Stores App-Specific Files.

**Table A-1** Subdirectories of the Library directory
Subdirectory	Directory contents
`Application Support`	Contains all app-specific data and support files. These are the files that your app creates and manages on behalf of the user and can include files that contain user data. By convention, all of these items should be put in a subdirectory whose name matches the bundle identifier of the app. For example, if your app is named MyApp and has the bundle identifier `com.example.MyApp`, you would put your app’s user-specific data files and resources in the `~/Library/Application Support/com.example.MyApp/` directory. Your app is responsible for creating this directory as needed. Resources required by the app to run must be placed inside the app bundle itself.
`Assistants`	Contains programs that assist users in configuration or other tasks.
`Audio`	Contains audio plug-ins, loops, and device drivers.
`Autosave Information`	Contains app-specific autosave data.
`Caches`	Contains cached data that can be regenerated as needed. Apps should never rely on the existence of cache files. Cache files should be placed in a directory whose name matches the bundle identifier of the app. By convention, apps should store cache files in a subdirectory whose name matches the bundle identifier of the app. For example, if your app is named MyApp and has the bundle identifier `com.example.MyApp`, you would put user-specific cache files in the `~/Library/Caches/com.example.MyApp/` directory.
`ColorPickers`	Contains resources for picking colors according to a certain model, such as the HLS (Hue Angle, Saturation, Lightness) picker or RGB picker.
`ColorSync`	Contains ColorSync profiles and scripts.
`Components`	Contains system bundles and extensions.
`Containers`	Contains the home directories for any sandboxed apps. (Available in the user domain only.)
`Contextual Menu Items`	Contains plug-ins for extending system-level contextual menus.
`Cookies`	Contains data files with web browser cookies.
`Developer`	Contains data used by Xcode and other developer tools.
`Dictionaries`	Contains language dictionaries for the spell checker.
`Documentation`	Contains documentation files and Apple Help packages intended for the users and administrators of the computer. (Apple Help packages are located in the `Documentation/Help` directory.) In the local domain, this directory contains the help packages shipped by Apple (excluding developer documentation).
`Extensions`	Contains device drivers and other kernel extensions.
`Favorites`	Contains aliases to frequently accessed folders, files, or websites. (Available in the user domain only.)
`Fonts`	Contains font files for both display and printing.
`Frameworks`	Contains frameworks and shared libraries. The `Frameworks` directory in the system domain is for Apple-provided frameworks only. Developers should install their custom frameworks in either the local or user domain.
`Internet Plug-ins`	Contains plug-ins, libraries, and filters for web-browser content.
`Keyboards`	Contains keyboard definitions.
`LaunchAgents`	Specifies the agent apps to launch and run for the current user.
`LaunchDaemons`	Specifies the daemons to launch and run as root on the system.
`Logs`	Contains log files for the console and specific system services. Users can also view these logs using the Console app.
`Mail`	Contains the user’s mailboxes. (Available in the user domain only.)
`PreferencePanes`	Contains plug-ins for the System Preferences app. Developers should install their custom preference panes in the local domain.
`Preferences`	Contains the user’s preferences. You should never create files in this directory yourself. To get or set preference values, you should always use the `NSUserDefaults` class or an equivalent system-provided interface.
`Printers`	In the system and local domains, this directory contains print drivers, PPD plug-ins, and libraries needed to configure printers. In the user domain, this directory contains the user’s available printer configurations.
`QuickLook`	Contains QuickLook plug-ins. If your app defines a QuickLook plug-in for viewing custom document types, install it in this directory (user or local domains only).
`QuickTime`	Contains QuickTime components and extensions.
`Screen Savers`	Contains screen saver definitions. See Screen Saver Framework Reference for a description of the interfaces used to create screen saver plug-ins.
`Scripting Additions`	Contains scripts and scripting resources that extend the capabilities of AppleScript.
`Sounds`	Contains system alert sounds.
`StartupItems`	(Deprecated) Contains system and third-party scripts and programs to be run at boot time. (See Daemons and Services Programming Guide for more information about starting up processes at boot time.)
`Web Server`	Contains web server content. This directory contains the CGI scripts and webpages to be served. (Available in the local domain only.)

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