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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.
Click+Space Bar: If you want to see what a file looks like but you don’t want to waste time opening the associated app, select the file in a Finder folder and then press the space bar. Discover the innovative world of Apple and shop everything iPhone, iPad, Apple Watch, Mac, and Apple TV, plus explore accessories, entertainment, and expert device support.
Apps take ridiculously long to open in OSX (Mountain Lion). When I use bootcamp to go into Windows 7, however, my computer is fast, apps open quickly, and games run on high. It doesn't matter what app I try to open; even system preferences takes a good 20-30 seconds to open in OSX. Keep using the Touch Bar to find the best ways to achieve the results you want. Move seamlessly between the Touch Bar, your keyboard, and the trackpad to get the job done. See Apps included with your Mac and the sections for each app for information about their Touch Bar features. On your Mac, do any of the following: Ask Siri: Click the Siri icon in the menu bar(or use the Touch Bar), then say something like “Open Contacts.”. From the Dock: Click the app icon in the Dock. From Launchpad: Click the Launchpad icon in the Dock (or use the Control Strip), then click the app icon.
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.
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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.
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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.
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For developer guidance, see UITabBar.
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/good-typing-apps-mac.html. 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.