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Tab Bars
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A tab bar appears at the bottom of an app screen and provides the ability to quickly switch between different sections of an app. Tab bars are translucent, may have a background tint, maintain the same height in all screen orientations, and are hidden when a keyboard is displayed. A tab bar may contain any number of tabs, but the number of visible tabs varies based on the device size and orientation. If some tabs can’t be displayed due to limited horizontal space, the final visible tab becomes a More tab, which reveals the additional tabs in a list on a separate screen.
In general, use a tab bar to organize information at the app level. A tab bar is a good way to flatten your information hierarchy and provide access to several peer information categories or modes at once.
Use a tab bar strictly for navigation. Tab bar buttons should not be used to perform actions. If you need to provide controls that act on elements in the current view, use a toolbar instead. See Toolbars.
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Avoid having too many tabs. Each additional tab reduces the tappable area for selecting a tab and increases the complexity of your app, making it harder to locate information. Although a More tab can display extra tabs, this requires additional taps and is a poor use of space. Include essential tabs only, and use the minimum tabs necessary for your information hierarchy. Too few tabs can be a problem too, as it can make your interface appear disconnected. In general, use between three and five tabs on iPhone. A few more are acceptable on iPad.
Don't hide a tab bar when people navigate to different areas in your app. A tab bar enables global navigation for your app, so it should remain visible everywhere. The exception to this is in modal views. Because a modal view gives people a separate experience that they dismiss when they're finished, it's not part of the overall navigation of your app.
Don’t remove or disable a tab when its function is unavailable. If tabs are available in some cases but not in others, your app’s interface becomes unstable and unpredictable. Ensure that all tabs are always enabled, and explain why a tab’s content is unavailable. For example, if there are no songs on an iOS device, the My Music tab in the Music app explains how to download songs.
Always switch contexts in the attached view. To keep your interface predictable, selecting a tab should always affect the view that’s directly attached to the tab bar, not another view elsewhere on screen. For example, selecting a tab on the left side of a split view shouldn’t cause the right side of the split view to suddenly change. Selecting a tab in a popover shouldn’t cause the view behind the popup to change.
Make sure tab bar icons are visually consistent and balanced. The system offers a range of predefined icons for common use cases. See System Icons > Tab Bar Icons. You can also create your own icons. See Custom Icons.
Use badging to communicate unobtrusively. You can display a badge—a red oval containing white text and either a number or an exclamation point—on a tab to indicate that new information is associated with that view or mode.
For developer guidance, see UITabBar.
TIP It’s important to understand the difference between a tab bar and a toolbar, because both types of bars appear at the bottom of an app screen. A tab bar lets the user switch quickly between different sections of an app, such as the Alarm, Stopwatch, and Timer tabs in the Clock app. A toolbar contains buttons for performing actions related to the current context, like creating an item, deleting an item, adding an annotation, or taking a photo. See Toolbars. Tab bars and toolbars never appear together in the same view.
This article is intended for system administrators who set security policy in enterprise environments that require smart card authentication.
Enable smart card-only login
Make sure that you carefully follow these steps to ensure that users will be able to log in to the computer.
- Pair a smart card to an admin user account or configure Attribute Matching.
- If you’ve enabled strict certificate checks, install any root certificates or intermediates that are required.
- Confirm that you can log in to an administrator account using a smart card.
- Install a smart-card configuration profile that includes '<key>enforceSmartCard</key><true/>,' as shown in the smart card-only configuration profile below.
- Confirm that you can still log in using a smart card.
For more information about smart card payload settings, see the Apple Configuration Profile Reference.
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For more information about using smart card services, see the macOS Deployment Guide or open Terminal and enter
man SmartCardServices
.Disable smart card-only authentication
If you manually manage the profiles that are installed on the computer, you can remove the smart card-only profile in two ways. You can use the Profiles pane of System Preferences, or you can use the /usr/bin/profiles command-line tool. For more information, open Terminal and enter
man profiles
.If your client computers are enrolled in Mobile Device Management (MDM), you can restore password-based authentication. To do this, remove the smart card configuration profile that enables the smart card-only restriction from the client computers.
To prevent users from being locked out of their account, remove the enforceSmartCard profile before you unpair a smart card or disable attribute matching. If a user is locked out of their account, remove the configuration profile to fix the issue.
If you apply the smart card-only policy before you enable smart card-only authentication, a user can get locked out of their computer. To fix this issue, remove the smart card-only policy:
- Turn on your Mac, then immediately press and hold Command-R to start up from macOS Recovery. Release the keys when you see the Apple logo, a spinning globe, or a prompt for a firmware password.
- Select Disk Utility from the Utilities window, then click Continue.
- From the Disk Utility sidebar, select the volume that you're using, then choose File > Mount from the menu bar. (If the volume is already mounted, this option is dimmed.) Then enter your administrator password when prompted.
- Quit Disk Utility.
- Choose Terminal from the Utilities menu in the menu bar.
- Delete the Configuration Profile Repository. To do this, open Terminal and enter the following commands.
In these commands, replace <volumename> with the name of the macOS volume where the profile settings were installed.rm /Volumes/<volumename>/var/db/ConfigurationProfiles/MDM_ComputerPrefs.plist
rm /Volumes/<volumename>/var/db/ConfigurationProfiles/.profilesAreInstalled
rm /Volumes/<volumename>/var/db/ConfigurationProfiles/Settings/.profilesAreInstalled
rm /Volumes/<volumename>/var/db/ConfigurationProfiles/Store/ConfigProfiles.binary
rm /Volumes/<volumename>/var/db/ConfigurationProfiles/Setup/.profileSetupDone
- When done, choose Apple () menu > Restart.
- Reinstall all the configuration profiles that existed before you enabled smart card-only authentication.
Configure Secure Shell Daemon (SSHD) to support smart card-only authentication
Users can use their smart card to authenticate over SSH to the local computer or to remote computers that are correctly configured. Follow these steps to configure SSHD on a computer so that it supports smart card authentication.
Update the /etc/ssh/sshd_config file:
- Use the following command to back up the sshd_config file:
sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config_backup_`date '+%Y-%m-%d_%H:%M'`
- In the sshd_config file, change '#ChallengeResponseAuthentication yes' to 'ChallengeResponseAuthentication no' and change '#PasswordAuthentication yes' to '#PasswordAuthentication no.'
Then, use the following commands to restart SSHD:
sudo launchctl stop com.openssh.sshd
sudo launchctl start com.openssh.sshd
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If a user wants to authenticate SSH sessions using a smart card, have them follow these steps:
- Use the following command to export the public key from their smart card:
ssh-keygen -D /usr/lib/ssh-keychain.dylib
- Add the public key from the previous step to the ~/.ssh/authorized_keys file on the target computer.
- Use the following command to back up the ssh_config file:
sudo cp /etc/ssh/ssh_config /etc/ssh/ssh_config_backup_`date '+%Y-%m-%d_%H:%M'`
- In the/etc/ssh/ssh_config file, add the line 'PKCS11Provider=/usr/lib/ssh-keychain.dylib.'
If the user wants to, they can also use the following command to add the private key to their ssh-agent:
ssh-add -s /usr/lib/ssh-keychain.dylib
Enable smart card-only for the SUDO command
Use the following command to back up the /etc/pam.d/sudo file:
sudo cp /etc/pam.d/sudo /etc/pam.d/sudo_backup_`date '+%Y-%m-%d_%H:%M'`
Then, replace all of the contents of the /etc/pam.d/sudo file with the following text:
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Enable smart card-only for the LOGIN command
Use the following command to back up the /etc/pam.d/login file:
sudo cp /etc/pam.d/login /etc/pam.d/login_backup_`date '+%Y-%m-%d_%H:%M'`
New macbook pro design. Then, replace all of the contents of the/etc/pam.d/login file with the following text:
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Enable smart card-only for the SU command
Use the following command to back up the /etc/pam.d/su file:
sudo cp /etc/pam.d/su /etc/pam.d/su_backup_`date '+%Y-%m-%d_%H:%M'`
Then, replace all of the contents of the/etc/pam.d/su file with the following text:
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Sample smart card-only configuration profile
Here’s a sample smart card-only configuration profile. You can use it to see the kinds of keys and strings that this type of profile includes.