how to print barcode in vb.net 2008 The Map Kit framework in Objective-C

Printing QR Code 2d barcode in Objective-C The Map Kit framework

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Table 17.2
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The Map Kit framework
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MKMapView user interaction properties
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Description The type of map to be displayed. The possible options for this variable are MKMapTypeStandard, MKMapTypeSatellite, and MKMapTypeHybrid. Updating this property automatically causes the map to change its view. Determines if the user is able to zoom in. If set to NO, the map is fixed to a specific span. When set to YES, the user is able to scroll around the map. If set to NO, the map becomes fixed on one location.
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Task mapType
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preferences vary about how the map should display. Figure 17.3 shows the difference between the map types. As you can see, you have quite a bit of control over how the map looks. The standard map view looks much like a road map that you use for navigation. This is often the most useful of the map types. The other two are similar. The only difference between them is the road names that appear in the hybrid view in addition to the satellite photos. Now that you have a grasp of the basic map controls, we ll discuss something a little more interesting: reverse geocoding.
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17.3 Reverse geocoding
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Reverse geocoding is the process of finding an address, an area, or other information about a given location based on its latitude and longitude. Apple has provided a simple interface for retrieving this information. The class used for reverse geocoding is called MKReverseGeocoder. It s a powerful class with a simple interface. In addition to its init method, it only has two other methods and two properties. Table 17.3 lists these and explains their use.
Figure 17.3 mapTypes: (from left to right) MKMapTypeStandard, MKMapTypeSatellite, MKMapTypeHybrid
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Reverse geocoding
Table 17.3 Task delegate
MKReverseGeocoder class methods and properties
Type Property Description Specifies the delegate of the reverse geocoder. The delegate receives messages from the geocoder, including errors and location information. The coordinate for which the reverse geocoder is retrieving data. Invokes the reverse geocoding. When this method completes, it calls one of the two delegate methods for this class. A Boolean variable to indicate whether the reverse geocoder is currently retrieving data. Cancels the request for data.
coordinate start
Property Method
querying
Property
cancel
Method
To create a new MKReverseGeocoder object, you must call its initWithCoordinate method. This method sets the geocoder s coordinate property to the incoming value and prepares it to receive the data. The following code shows how to initialize an MKReverseGeocoder given the center of a map:
- (IBAction) getAddress:(id) sender { MKReverseGeocoder * geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:theMap.centerCoordinate]; [geoCoder setDelegate:self]; [geoCoder start]; }
You need to make sure you set the geocoder s delegate property to something that implements the MKReverseGeocoderDelegate protocol. Otherwise, you won t see the data that gets received. Only two methods must be implemented as part of the MKReverseGeocoderDelegate protocol: reverseGeocoder:didFindPlacemark: and reverseGeocoder: didFailWithError:. The didFailWithError method is similar to any other error delegate method. It s passed a reference to the geocoder as well as an error object containing information about the failure. There are two cases for a failure. The first occurs when the device isn t connected to the internet. Because information is retrieved from Google s web servers, a device must be connected to the internet to be able to access it. The second case for failure occurs when no data is available for the given coordinate. This may occur when the user requests information about a remote location or the ocean. Upon a successful retrieval of data, the didFindPlacemark method is called with a reference to the geocoder and an MKPlacemark object. An MKPlacemark is a simple object that contains specific information about a given location. This information is stored inside a property called addressDictionary. In addition to this dictionary, all the values are parsed out and put into their own properties of the class. Here s some simple code to output the placemark data in the form of an NSDictionary:
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