In either case, the list continues to move based on the flicking motion of the finger, slowly decelerating as if affected by friction. Similarly, scrolling through a long list in a menu works as if the list is pasted on the outer surface of a wheel: the wheel can be "spun" by sliding a finger over the display from bottom to top (or vice versa). For example, zooming in and out of web pages and photos is done by placing two fingers on the screen and spreading them farther apart or bringing them closer together. The iPhone user interface enables the user to move the content itself up or down by a touch-drag motion of the finger. Īlmost all input is given through the touch screen, which understands complex gestures using multi-touch. Because the screen is a capacitive touchscreen, bare skin is required a stylus or a normal glove prevents the necessary electrical conductivity. He 9 cm (3.5 in) liquid crystal display (320×480 px at 6.3 px/mm, 160 ppi) HVGA touchscreen with scratch-resistant glass is specifically created for use with a finger, or multiple fingers for multi-touch sensing.
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