C H A P T E R 4

Pickers

Hierarchical List Pickers

If a list of picker items is extremely long, index tabs won’t be enough to prevent interminable scrolling. What happens is a user taps a tab and immediately sees the beginning of the corresponding section of picker items, but the user still must scroll several times to find an item that’s not near the beginning of that section. For example, imagine one picker that lists several hundred cities from around the world.

The solution to this situation is to create a two-level hierarchy of list pickers. The first-level picker contains a set of picker items and a diamond label. Tapping the diamond label pops up a second-level picker that lists different sets of picker items for the first-level picker. Picking an item in the second-level picker determines which set of items appear in the first-level picker. For example, compared to a single picker that lists hundreds of cities, a two-level picker hierarchy simplifies picking a city anywhere in the world. The first- level picker lists cities for just one country and contains the name of the country as a diamond label. A user can pick one of the listed cities or tap the diamond label to pop up a second-level picker that lists other countries. If the user picks a country, then the first-level picker changes to list that country’s cities. Figure 4-11 shows how the city and country hierarchical pickers work.

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List Pickers

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Apple 2 manual Hierarchical List Pickers

2 specifications

The Apple II is a defining product in the history of personal computing, first introduced in 1977 by Apple Computer, Inc. Designed by Steve Wozniak, the Apple II was one of the first highly successful mass-produced microcomputer products and played a significant role in bringing personal computers into homes and schools.

One of the Apple II's standout features was its color graphics capability. It was one of the first personal computers to provide color output, thanks to its built-in video interface. The initial model supported a resolution of 280x192 pixels with a palette of 6 colors, which allowed for vibrant visuals that set it apart from contemporaries like the monochrome Altair 8800.

The Apple II was notable for its open architecture. This design allowed users to expand the computer's capabilities easily through a series of expansion slots. Users could add floppy disk drives, additional memory, and various peripheral devices, making the system highly adaptable to individual needs. This encouraged a thriving ecosystem of third-party hardware and software, which contributed to its popularity.

Another significant feature was its use of the 6502 microprocessor. This 8-bit CPU was not only affordable but also powerful for its time, allowing the Apple II to run various applications efficiently. Along with a built-in keyboard and an innovative plastic case that housed its components, the design was user-friendly and appealing.

The Apple II also introduced the concept of “bootable software” through the use of floppy disks. The disk operating system (DOS) allowed users to store and run multiple programs without having to reload software manually, providing a level of convenience that had not been widely available before. Key software like VisiCalc, the first spreadsheet program, helped boost sales, showcasing the Apple II's utility in business and education environments.

The computer was also well-known for its early adoption of BASIC programming language. Apple provided an operating system that supported Applesoft BASIC, which enabled users, including students, to write their programs, further fostering a community of developers.

In summary, the Apple II's color graphics, open architecture, powerful 6502 processor, innovative use of floppy disks, and support for BASIC programming made it a revolutionary product in its time. Its legacy laid the groundwork for future personal computers and established Apple as a leader in the burgeoning tech industry. The Apple II remains an iconic symbol of the early personal computing era, reflecting a generation's transition into a digitally connected world.