zebra barcode printer in vb.net 7: Postage in Objective-C

Encode Denso QR Bar Code in Objective-C 7: Postage

CHAPTER 7: Postage
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Giving Hints About Flow
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While testing Postage, we found that new users sometimes double-tapped a postcard design on our first screen to select it. Our design actually called for using the navigation bar to move to the next step. We contemplated having both a double-tap of the postcard as well as tapping the right navigation button carry the user on to the next step. In the end, we decided against dual controls for two reasons: First, we would have a hard time supporting the same double-tap in later stages of the interface. We felt this would have broken our context or expectations of our users when the same behavior would vary in result from screen to screen. Second, we knew that most all steps after the first one would require tapping the right navigation button to move to the next step. We felt that, at some point, the user would have to learn that the right navigation button is how to move on. In the end, we decided to have double-tapping that first screen present a small pop-up hint that momentarily indicated that the right navigation button would advance to the next step. At that point, we felt we had trained the users who did not naturally see the right navigation button to begin to look there to advance through the application.
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Figure 7-14. Giving the users a hint
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We also deployed similar hints in other locations in the interface. The photo-picking screen allows the user to scale, position, and rotate the image. While the scale and position actions might be familiar to the user from the built-in Photos application, rotation was potentially a new concept. We also felt it was possible that the user might not think to touch the photo to manipulate it. To resolve this problem without permanently sacrificing valuable pixels, we choose to once again momentary display a textual hint when a photo has been picked. Postage also uses another important form of hinting. Our horizontal button bar was a fairly novel control that many users might not be familiar with. We needed to give the users some indication that the control would scroll with more choices if swiped left or right. To solve this dilemma, we borrowed a technique that is employed throughout the iPhone user interface whenever a vertical list or table is displayed. All of Apple s applications, and most third-party ones, are careful to make sure that at least one partially obscured cell or item is visible in any list or table view. In other words, the
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CHAPTER 7: Postage
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height of the entire table is never a whole multiple of the height of the table cells. When users see this partially hidden item, they are naturally compelled to swipe to make the cell visible. We used the same technique for our horizontal button bars. We took great care to size our buttons so that half of a button is always shown when the bar is scrolled completely left or right. This gives the user an immediate hint that more exciting buttons are just waiting to be scrolled into view! We also added a small technique to further guide the user into exploring the choices available by scrolling the button bars. When an obscured button is tapped, the whole button bar automatically is scrolled so that more of the hidden controls are made visible. This quickly shows the user that more awaits them with a simple swipe. Unfortunately, even Apple doesn t always follow it s own lead in UI design. The Stocks application that comes with the iPhone is a perfect example of how not to implement a scrolling list (see Figure 7-15). The table view that lists each security you are tracking is sized so that it is exactly an even multiple of the height of the cells in the table. When there are more rows in the table than can be shown at once, there is no indication that any content is being clipped by the view. On the desktop, this design would not be a problem, because a scroll bar would be used to indicate the content was bigger than the view. On the phone, scroll bars are only visible when scrolling, so there is no indication that anything is missing. How will you know it s time to cash in on that APPL you bought four years ago for a vacation home in Hawaii if the tricky Stocks application hides that data from you
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