Core Location and the internet in Objective-C

Print QR Code in Objective-C Core Location and the internet

10.4.5 Core Location and the internet
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In this section, you ve seen a few real-world examples of how to use location information in meaningful ways, but you ll find that you can make much better use of the information when you have an internet connection. When you do, you can feed longitudes and latitudes to various sites. For example, you can pull up maps with a site like Google Maps. You can also improve on the altitude information by instead requesting the geographic altitude of a location using a site like GeoNames. This won t be accurate if your user is in an airplane or a tall office building; but for the majority of situations, it ll be better than what the device can currently deliver. See chapter 14 for some examples of using Core Location with the internet.
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Summary
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10.5 Summary
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In this chapter, we ve covered three of the most unique features available to you as an SDK programmer. The accelerometers can give you access to a variety of information about where a device exists in space. By sensing gravity, you can easily discover precise orientation. By measuring movement, you can see how the device is being guided through space. Finally, you can build more complex movements into three-dimensional gestures, such as a shake. We ve talked about the touch screen when discussing input, but the accelerometers provide another method for allowing users to make simple adjustments to a program. We can imagine game controls and painting programs built entirely around the accelerometers. The internal GPS can give you information about longitude, latitude, and altitude. The horizontal information is the most reliable, although it s more useful when you connect to the internet. Altitude information isn t available to everyone, and even if it is, it has a higher chance of being incorrect, so use it with caution. The compass gives you complete information about the user s heading. It lets you determine exactly which way the device is facing and allows for a large variety of new application types. In the next chapter, we ll talk about media, highlighting pictures, videos, and sounds.
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Media: images and the camera
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This chapter covers
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So far, our focus has mainly been on text. Sure, we ve displayed the occasional UIImage, such as the mountain drawing in the previous chapter, but we ve considered only the simplest means for doing so. The iPhone offers an experience that s potentially much richer and more engaging. A camera, a microphone, a complete library of photos, and a speaker are just some of the utilities built into the iPhone. Less the camera, the iPad contains all the aforementioned libraries and features that the iPhone does. In this chapter and the next, we ll look at these features as part of a general exploration of media. We ll provide deep coverage of images as well as using the iPhone s camera. More complex questions are beyond the scope of this chapter. We re saving the topic of image editing for a later chapter, when we look at the iPhone s graphic libraries.
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An introduction to images
11.1 An introduction to images
We ve touched on using images a few times, beginData ning in chapter 4, where one of the earliest SDK examples included an image. You ve always created a UIImageView in Interface Builder, attached it to a UIImage filename, and not worried about the details. We re now ready to consider the details. We ll look at some of the options available when you dive into Xcode, rather than depending on Interface UIImageView UIView Builder s higher-level abstractions. CALayer When you look more closely, you ll discover that using images is a two-step process. First, you load Figure 11.1 Images can be shown in data into a UIImage, and then you make use of that UIImageViews or in UIViews. UIImage via some other means. There are two major ways to use UIImages, as shown in figure 11.1. We re going to explore the primary method of displaying images, using UIImageView, in this section, and in section 11.2 we ll examine the more complex means available for drawing images onto the back layer of a UIView.
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