People often launch apps from the Home screen, so they tend to expect all apps to start in the same orientation. Because of the different ways iPhone and iPad display the Home screen, this expectation affects apps in different ways:
On iPhone and iPod touch, the Home screen is displayed in one orientation only, which is portrait, with the Home button at the bottom. This leads users to expect iPhone apps to launch in this orientation by default.
On iPad, the Home screen is displayed in all orientations, so users tend to expect iPad apps to launch in the device orientation they’re currently using.
The display of an iOS-based device is at the heart of the user’s experience. Not only do people view beautiful text, graphics, and media on the display, they also physically interact with the Multi-Touch screen to drive their experience (even when they can’t see the screen).
Although displays of different dimensions and resolutions can have different effects on user experience with an app, some effects apply to all iOS-based devices:
The comfortable minimum size of tappable UI elements is 44 x 44 points.
The quality of app artwork is very apparent.
The user’s focus is on the content.
iOS-based devices have the following screen sizes:
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