macOS
VoiceOver was first introduced in Mac OS X 10.4 and the target was users who had difficulty in reading due to vision impairment, particularly the blind. A preview had also been made available for Mac OS X 10.3 Panther, and was titled "Spoken Interface Preview."
VoiceOver treats the user interface as a hierarchy of elements, which are navigated by various keystrokes. Elements also are "interacted" with—for example, interacting with a text box allows reading its text and, if possible, editing it; interacting with a scroll bar allows it to be moved using the keyboard.
VoiceOver also includes support for many Braille displays. In addition, VoiceOver includes features for those that cannot use the mouse, such as keyboard-based navigation.
For users with MacBooks or Magic Trackpads, a number of special multitouch features are also available. The trackpad will respond to gestures, much like iOS's version of VoiceOver. A specific example is using the trackpad to explore the actual visual layout of elements on the screen - sliding one finger around the trackpad will select elements, tapping twice will activate them.
In Mac OS X 10.5, Apple added the "Alex" voice, which offered improved quality of speech and a more human-like sound. Previously, the voices were directly descended from those used in Apple's "Speech Manager," which originated in the early 1990s. Also, Alex voice has natural breathing, unlike all other voices in Apple. [2]
In Mac OS X 10.7, Apple offered the download of RealSpeak voices from Nuance for use with VoiceOver.
Accessibility Inspector
Accessibility Inspector is made to verify the accessibility of OS X applications. It displays information about the GUI element that is currently under the cursor. [3]
iOS
A few months later, with the release of the iPhone 3GS, VoiceOver was added to iOS. When the iPod Touch was upgraded to match the hardware of the iPhone 3GS (in iPod touch's third generation), it also gained VoiceOver capability. The iPad, since its introduction, has also had VoiceOver capability.
VoiceOver on iOS interacts with the user by using various "gestures," different motions one makes with one or more fingers on the display. Many gestures are location-sensitive—for example, sliding one's finger around the screen will reveal the visual contents of the screen as the finger passes over them. This enables blind users to explore the actual on-screen layout of an application. A user can double-tap—similar to double-clicking a mouse—to activate a selected element, just as if a sighted user had tapped the item.
VoiceOver can also turn off the display but leave the touch screen sensitive to touch, saving battery power. Apple calls this feature "Screen Curtain". It is also available on Mac computers running OS X.
VoiceOver for iOS is activated using the "Settings" application. It can be found in the Accessibility section. The device can also be configured so that VoiceOver can be toggled by a triple-click of the Home or side button on the device. The user can also ask Siri to enable or disable VoiceOver.
A pointing device is a human interface device that allows a user to input spatial data to a computer. CAD systems and graphical user interfaces (GUI) allow the user to control and provide data to the computer using physical gestures by moving a hand-held mouse or similar device across the surface of the physical desktop and activating switches on the mouse. Movements of the pointing device are echoed on the screen by movements of the pointer and other visual changes. Common gestures are point and click and drag and drop.
A scrollbar is an interaction technique or widget in which continuous text, pictures, or any other content can be scrolled in a predetermined direction on a computer display, window, or viewport so that all of the content can be viewed, even if only a fraction of the content can be seen on a device's screen at one time. It offers a solution to the problem of navigation to a known or unknown location within a two-dimensional information space. It was also known as a handle in the very first GUIs. They are present in a wide range of electronic devices including computers, graphing calculators, mobile phones, and portable media players. The user interacts with the scrollbar elements using some method of direct action, the scrollbar translates that action into scrolling commands, and the user receives feedback through a visual updating of both the scrollbar elements and the scrolled content.
A touchpad or trackpad is a type of pointing device. Its largest component is a tactile sensor: an electronic device with a flat surface, that detects the motion and position of a user's fingers, and translates them to a position on a screen, to control a pointer in a graphical user interface. Touchpads are common on laptop computers, contrasted with desktop computers, where mice are more prevalent. Trackpads are sometimes used on desktops, where desk space is scarce. Because trackpads can be made small, they can be found on personal digital assistants (PDAs) and some portable media players. Wireless touchpads are also available, as detached accessories.
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