zebra barcode printer in vb.net Figure 20. Overlapping background images in our first implementation in Objective-C

Drawer QR Code 2d barcode in Objective-C Figure 20. Overlapping background images in our first implementation

Figure 20. Overlapping background images in our first implementation
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While this looked so simple on the whiteboard, the actual realization of this turned out to be a protracted development nightmare. We found that, despite our best efforts, we could not create a browsing experience that loaded the art assets we needed on demand for browsing without causing one of two ugly problems. Either the application would become unresponsive for moments at a time while scrolling through designs, or we would be forced to display a low-resolution proxy or placeholder of a postcard design before it was completely loaded from storage to display. Both experiences left the act of browsing our beautiful postcard designs feeling somewhat second-rate.
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CHAPTER 7: Postage
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In the end, we found our solution, though it came with a price. Our postcard art assets started life in the PNG file format. PNG is the preferred native format for iPhone UI resources, and it supports the transparency we needed to make our cool overlapped edges. What we discovered, though, was that loading our PNG files specifically was what caused our momentary hiccup, which resulted in our unresponsivenes or the need to display a low-resolution proxy while waiting for the image to finish loading. If we switched to using a JPEG file format, the load of the art assets for each newly visible postcard template was no longer causing interruptions in our applications. Sadly, the change to JPEG meant that we had to sacrifice transparency in our background images, thereby eliminating our ability to have overlapping edges. What is the lesson you can take from this Specifications are a great way to plan out your application, but you have to allow for knowledge that you gain when turning that specification into real-running code that will inevitably lead to unanticipated changes. If you go wild with your design ideas, there will be places where the limitations of the real world will force you to rein in your interface ambitions some. Spend some time exploring the more complicated aspects of your intended design, and see if the device and SDK are capable of your intent. Postage contains over 40,000 lines of code! We spent approximately 35 person-weeks of development with as many as 5 engineers and 1 designer building the application over a 2month period before shipping the first version.
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Considering Art
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Many art techniques can be used to support our design goals of focus and flow in an iPhone application. For instance, it is important to focus the user s attention to the proper portions of your interface. Postage is a creative application where the primary focus of the interface should be the user s content. To support this, application interface elements such as the navigation bar and tab bar controls are intentionally colored with gray tones in order to be neutral against the color and vibrant postcard designs (see Figure 7-21). Subtle gradient drop shadows are used at the boundaries between the interface elements and the postcard to enhance the separation between interface and content.
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CHAPTER 7: Postage
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Figure 7-21. Using neutral interface colors and shadows to highlight the content
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Consistency in art is also effective in maintaining context and enhancing the cohesive feel of an application. Users may not be able to point out exactly why, but subconsciously, they will sense this consistency and perceive the higher quality of design. An application with art that is consistent with itself and the iPhone OS will simply feel more correct or Apple-like. Note that all lighting on the iPhone is from the top of the screen down. Make sure all your gradients, highlights, and drop shadows maintain this lighting for normal user interface elements. Strive to use consistent button styles as well. Pay careful attention to the pressed and highlighted states of your buttons. If you are creating custom buttons, you will likely want to include your own highlighted and selected states as well.
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