Para usar o MKMapView voc\u00ea precisa apenas arrastar e soltar o controle no seu Window atrav\u00e9s do Interface Builder, al\u00e9m claro do controle Segmented Control que ir\u00e1 permitir a troca do tipo de vis\u00e3o do Mapa (Standard, Hybrid, Satellite).<\/p>\n
Com base no endere\u00e7o informado a aplica\u00e7\u00e3o ir\u00e1 adicionar um PIN no mapa referente ao endere\u00e7o exato, para adicionar um marcador PIN ao mapa ser\u00e1 necess\u00e1rio criar e adicionar MKAnnotations ao MKMapView. MKAnnotation \u00e9 uma classe abstrata e tem que ser implementada na sua aplica\u00e7\u00e3o como mostro no c\u00f3digo abaixo.<\/p>\n Agora tenho que implementar o Search Bar delegate respons\u00e1vel por gerenciar os eventos gerados, o exemplo abaixo n\u00e3o \u00e9 uma implementa\u00e7\u00e3o completa do UISearchDelegate, mas implementa o necess\u00e1rio para gerenciar as mudan\u00e7as de comportamente na hora de efetuar uma busca (search).<\/p>\n O bot\u00e3o de busca (Search) obtem a latitude\/longitude utilizando o web service do Google e utilizando a classe MyAnnotation ir\u00e1 adicionar um PIN ao mapa. Lembre-se que voc\u00ea precisa obter uma chave para utilizar a API do Google Maps atrav\u00e9s do link http:\/\/code.google.com\/apis\/maps\/signup.html para usar esta aplica\u00e7\u00e3o, associe o seu Google Maps Key a vari\u00e1vel GoogleMapsKey.<\/p>\n Para finalizar abaixo temos a implementa\u00e7\u00e3o que busca a latitude\/longitude usando o web services do Google, temos apenas que passar o endere\u00e7o e o Google ir\u00e1 retornar a informa\u00e7\u00e3o.<\/p>\n Quando executamos a aplica\u00e7\u00e3o podemos visualizar o mapa de 3 formas diferentes conforme as figura abaixo, o PIN (em vermelho) est\u00e1 na posi\u00e7\u00e3o onde est\u00e1 localizado nosso escrit\u00f3rio aqui em Scotts Valley.![\"\"](\"http:\/\/www.andreanolanusse.com\/pt\/wp-content\/uploads\/2011\/01\/IB_Window_MKMapView.png\" "\\"MKMapView\\"")
<\/a><\/p>\n\t MyAnnotation nested in AppDelegate = public class(MKAnnotation)\r\n\t private\r\n\t _coordinate: CLLocationCoordinate2D;\r\n\t _title: System.String;\r\n\t _subtitle: System.String;\r\n\t public\r\n\t property Coordinate : CLLocationCoordinate2D read _coordinate write _coordinate;override;\r\n\t property Title: System.String read _title; override;\r\n\t property Subtitle: System.String read _subtitle; override;\r\n \t \/\/ The custom constructor is required to pass the values to this class,\r\n\t \/\/ because in the MKAnnotation base the properties are read-only\r\n\t constructor (l: CLLocationCoordinate2D; t: System.String; s: System.String);\r\n\r\n\t end;<\/pre>\n
\t MySearchBarDelegate nested in AppDelegate = public class(UISearchBarDelegate)\r\n\t private\r\n\t app: AppDelegate;\r\n\t lastResult: MyAnnotation;\r\n\t GoogleMapsKey:String := String.Empty; \/\/ Define you google maps key here.\r\n \/\/ Keep a reference to the application so we can access the UIControls.\r\n\t \/\/ This needs to be an internal class to access those (private) controls.\r\n\t public\r\n\t constructor (a: AppDelegate);\r\n\t\t\/\/ Method for the searchbar to call when the user wants to search,\r\n\t\t\/\/ where we create and call the Geocoder class. Note that we are\r\n\t\t\/\/ calling it synchronously which is undesirable in a \"real\"\r\n\t\t\/\/ application.\r\n\t method SearchButtonClicked(searchBar: UISearchBar); override;\r\n\t end;\r\n\r\nmethod AppDelegate.MySearchBarDelegate.SearchButtonClicked(searchBar: UISearchBar);\r\nbegin\r\n\r\n var g := new Geocoder(GoogleMapsKey);\r\n var location: CLLocationCoordinate2D;\r\n searchBar.ResignFirstResponder;\r\n UIApplication.SharedApplication.NetworkActivityIndicatorVisible := true;\r\n\r\n \/\/ synchronous webservice call\r\n if g.Locate(searchBar.Text, out location) then begin\r\n if lastResult <> nil then\r\n begin\r\n \/\/ if there is already a pin on the map, remove it\r\n app.Map.RemoveAnnotation(lastResult)\r\n end;\r\n\r\n app.Map.SetCenterCoordinate(location, true);\r\n var pin := new MyAnnotation(location, searchBar.Text, location.Latitude.ToString + ',' + location.Longitude.ToString);\r\n app.Map.AddAnnotationObject(pin);\r\n lastResult := pin;\r\n end\r\n else\r\n begin\r\n \/\/ display a message that the webservice call didn't work\r\n using alert := new UIAlertView('Not found', 'No match found for ' + searchBar.Text, nil, 'OK', nil) do\r\n begin\r\n alert.Show()\r\n end\r\n end;\r\n UIApplication.SharedApplication.NetworkActivityIndicatorVisible := false;\r\nend;<\/pre>\ninterface\r\n\r\nuses\r\n System,\r\n System.Xml,\r\n System.IO,\r\n System.Net,\r\n MonoTouch.CoreLocation;\r\n\r\n\/\/ Documentation for the service http:\/\/code.google.com\/apis\/maps\/documentation\/geocoding\/\r\ntype\r\n Geocoder = public class\r\n public\r\n constructor (key: System.String);\r\n \/\/ Sign up for a Google Maps key http:\/\/code.google.com\/apis\/maps\/signup.html\r\n private\r\n var _GoogleMapsKey: System.String;\r\n var xmlString: System.String := '';\r\n public\r\n method Locate(query: System.String; out return: CLLocationCoordinate2D): System.Boolean;\r\n private\r\n \/\/ Retrieve a Url via WebClient\r\n class method GetUrl(url: System.String): System.String;\r\n end;\r\n\r\nimplementation\r\n\r\nconstructor Geocoder(key: System.String);\r\nbegin\r\n _GoogleMapsKey := key;\r\nend;\r\n\r\nmethod Geocoder.Locate(query: System.String; out return: CLLocationCoordinate2D): System.Boolean;\r\nvar\r\n url: System.String := 'http:\/\/maps.google.com\/maps\/geo?q={0}&output=xml&key=' + _GoogleMapsKey;\r\n coords: XmlNode := nil;\r\n xd: XmlDocument;\r\n xnm: XmlNamespaceManager;\r\n gl: System.String;\r\n coordinateArray: array of System.String;\r\nbegin\r\n\r\n url := String.Format(url, query);\r\n return := new CLLocationCoordinate2D(0, 0);\r\n\r\n try\r\n xmlString := GetUrl(url);\r\n xd := new XmlDocument();\r\n xd.LoadXml(xmlString);\r\n xnm := new XmlNamespaceManager(xd.NameTable);\r\n coords := xd.GetElementsByTagName('coordinates')[0]\r\n except \r\n\r\n end;\r\n\r\n if coords <> nil then begin\r\n coordinateArray := coords.InnerText.Split(',');\r\n\r\n if coordinateArray.Length >= 2 then begin\r\n gl := Convert.ToDouble(coordinateArray[1].ToString()).ToString + ',' + Convert.ToDouble(coordinateArray[0].ToString());\r\n\r\n return := new CLLocationCoordinate2D(Convert.ToDouble(coordinateArray[1].ToString()),\r\n Convert.ToDouble(coordinateArray[0].ToString()));\r\n exit true\r\n end\r\n end;\r\n\r\n exit false\r\nend;\r\n\r\nclass method Geocoder.GetUrl(url: System.String): System.String;\r\nvar\r\n return: System.String := System.String.Empty;\r\n client: System.Net.WebClient := new WebClient();\r\nbegin\r\n\r\n using strm: Stream := client.OpenRead(url) do\r\n begin\r\n var sr: StreamReader := new StreamReader(strm);\r\n return := sr.ReadToEnd()\r\n end;\r\n\r\n exit return;\r\nend;\r\n\r\nend.<\/pre>\n
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\n<\/a><\/a>![\"\"](\"http:\/\/www.andreanolanusse.com\/pt\/wp-content\/uploads\/2011\/01\/MapView_1.png\" "\\"MapView")
<\/a>![\"\"](\"http:\/\/www.andreanolanusse.com\/pt\/wp-content\/uploads\/2011\/01\/MapView_2.png\" "\\"MapView")
<\/a><\/a>![\"\"](\"http:\/\/www.andreanolanusse.com\/pt\/wp-content\/uploads\/2011\/01\/MapView_3.png\" "\\"MapView")
<\/a><\/p>\n
![\n<\/a>](\"http:\/\/www.andreanolanusse.com\/blogen\/wp-content\/uploads\/2010\/12\/MapView_1.png\"){kind=link}
![<\/a>](\"http:\/\/www.andreanolanusse.com\/blogen\/wp-content\/uploads\/2010\/12\/MapView_2.png\"){kind=link}