Mapsearch Reading Essays

Mapsearch

https://developer.apple.com/library/ios/samplecode/MapSearch/Introduction/Intro.html#//apple_ref/doc/uid/DTS40013332

1. #import <MapKit/MapKit.h>//Introduction of header Files
#import <CoreLocation/CoreLocation.h>
Follow the agreement
<cllocationmanagerdelegate, uisearchbardelegate>

2. declaring properties
@interface Mytableviewcontroller ()
@property (nonatomic, assign) mkcoordinateregion boundingregion;
@property (nonatomic, strong) Mklocalsearch *localsearch;
@property (nonatomic, weak) Iboutlet Uibarbuttonitem *viewallbutton;
@property (nonatomic, strong) Cllocationmanager *locationmanager;
@property (nonatomic) cllocationcoordinate2d usercoordinate;
@property (Weak, nonatomic) Iboutlet Uisearchbar *searchbar;

@end

3. Initialize Locationmanager
-(void) Viewdidload {
[Super Viewdidload];

Self.locationmanager = [[Cllocationmanager alloc] init];
}

4. UITableView delegate Methods
-(Nsinteger) TableView: (UITableView *) TableView numberofrowsinsection: (nsinteger) Section {
return [self.places Count];
}

-(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (Nsindexpath *) Indexpath {
UITableViewCell *cell = [TableView dequeuereusablecellwithidentifier:kcellidentifier Forindexpath:indexpath];

Mkmapitem *mapitem = [Self.places objectAtIndex:indexPath.row];
Cell.textLabel.text = Mapitem.name;

return cell;
}

5. Click the Search button to execute
-(void) searchbarsearchbuttonclicked: (Uisearchbar *) searchbar{
Check If location Services is available
if ([cllocationmanager locationservicesenabled] = = NO) {
NSLog (@ "%s:location services is not available.", __pretty_function__);

Display alert to the user.
Uialertcontroller *alert = [Uialertcontroller alertcontrollerwithtitle:@ "Location Services"
message:@ "Location Services is not enabled on the this device. Please enable the location services in Settings. "
Preferredstyle:uialertcontrollerstylealert];
uialertaction* DefaultAction = [uialertaction actionwithtitle:@ "Dismiss" Style:uialertactionstyledefault
handler:^ (Uialertaction * action) {}]; Do nothing action to dismiss the alert.

[Alert addaction:defaultaction];
[Self Presentviewcontroller:alert animated:yes completion:nil];

Return
}

//Request "When on use" Location service authorization.
//If authorization have been denied previously, we can display an alert If the user have denied location services prev iously.
if ([cllocationmanager authorizationstatus] = = kclauthorizationstatusnotdetermined) {
[Self.locationmanager Requestwheninuseauthorization];
} else if ([cllocationmanager authorizationstatus] = = kclauthorizationstatusdenied) {
NSLog (@ "%s:location servi Ces authorization was previously denied by the user. ", __pretty_function__);

Display alert to the user.
Uialertcontroller *alert = [Uialertcontroller alertcontrollerwithtitle:@ "Location Services"
message:@ "Location services were previously denied by the user. Please enable the location services for this app in Settings. "
Preferredstyle:uialertcontrollerstylealert];
uialertaction* DefaultAction = [uialertaction actionwithtitle:@ "Dismiss" Style:uialertactionstyledefault
handler:^ (Uialertaction * action) {}]; Do nothing action to dismiss the alert.

[Alert addaction:defaultaction];
[Self Presentviewcontroller:alert animated:yes completion:nil];

Return
}

Start updating locations.
Self.locationManager.delegate = self;
[Self.locationmanager startupdatinglocation];
}

6. Search around locations based on location information after getting location information
-(void) Locationmanager: (Cllocationmanager *) Manager didupdatelocations: (Nsarray *) Locations {

Remember for later the user's current location.
Cllocation *userlocation = Locations.lastobject;
Self.usercoordinate = userlocation.coordinate;

[Manager Stopupdatinglocation]; We only want one update.

Manager.delegate = nil; We might is called again here, even though we
Called "Stopupdatinglocation", so remove us as the delegate to be sure.

We have a and so start the search.
[Self startSearch:self.searchBar.text];
}

-(void) Startsearch: (NSString *) searchstring {
if (self.localSearch.searching)
{
[Self.localsearch Cancel];
}

Confine the map search area to the user's current location.
Mkcoordinateregion newregion;
NewRegion.center.latitude = Self.userCoordinate.latitude;
NewRegion.center.longitude = Self.userCoordinate.longitude;

Setup the area spanned by the map region:
We use the delta values to indicate the desired zoom level of the map,
(smaller delta values corresponding to a higher zoom level).
The numbers used here correspond to a roughly 8 mi
Diameter area.
//
NewRegion.span.latitudeDelta = 0.112872;
NewRegion.span.longitudeDelta = 0.109863;

Mklocalsearchrequest *request = [[Mklocalsearchrequest alloc] init];

Request.naturallanguagequery = SearchString;
Request.region = newregion;

Mklocalsearchcompletionhandler Completionhandler = ^ (Mklocalsearchresponse *response, NSError *error) {
if (Error! = nil) {
NSString *ERRORSTR = [[Error userInfo] valueforkey:nslocalizeddescriptionkey];
Uialertview *alert = [[Uialertview alloc] initwithtitle:@ "Could not find Places"
Message:errorstr
Delegate:nil
cancelbuttontitle:@ "OK"
Otherbuttontitles:nil];
[Alert show];
} else {
Self.places = [response Mapitems];

Used for later when setting the map's region in "Prepareforsegue".
Self.boundingregion = response.boundingregion;

self.viewAllButton.enabled = self.places! = nil? Yes:no;

[Self.tableview Reloaddata];
}
[UIApplication sharedapplication].networkactivityindicatorvisible = NO;
};

if (self.localsearch! = nil) {
Self.localsearch = nil;
}
Self.localsearch = [[Mklocalsearch alloc] initwithrequest:request];

[Self.localsearch Startwithcompletionhandler:completionhandler];
[UIApplication sharedapplication].networkactivityindicatorvisible = YES;
}

7. Click on the corresponding cell or click the ShowAll button to jump to the next screen.
-(void) Prepareforsegue: (Uistoryboardsegue *) Segue Sender: (ID) Sender {
Mapviewcontroller *mapviewcontroller = Segue.destinationviewcontroller;

if ([Segue.identifier isequaltostring:@ "ShowDetail"]) {
Get the single item.
Nsindexpath *selecteditempath = [Self.tableview indexpathforselectedrow];
Mkmapitem *mapitem = Self.places[selecteditempath.row];

Pass the new bounding region to the map destination view controller.
Mkcoordinateregion region = self.boundingregion;
and center it on the single placemark.
Region.center = mapItem.placemark.coordinate;
mapviewcontroller.boundingregion = region;

Pass the individual place to our map destination view controller.
Mapviewcontroller.mapitemlist = [Nsarray Arraywithobject:mapitem];

} else if ([Segue.identifier isequaltostring:@ "ShowAll"]) {

Pass the new bounding region to the map destination view controller.
Mapviewcontroller.boundingregion = self.boundingregion;

Pass the list of places found to our map destination view controller.
Mapviewcontroller.mapitemlist = self.places;
}
}

8. Adjust the map to Zoom/center to the annotations we want to show.
[Self.mapview setRegion:self.boundingRegion Animated:yes];

9. We Add the Placemarks to get the "drop" animation.
if (Self.mapItemList.count = = 1) {
Mkmapitem *mapitem = [Self.mapitemlist objectatindex:0];

Self.title = Mapitem.name;

Add the single annotation to our map.
Placeannotation *annotation = [[Placeannotation alloc] init];
Annotation.coordinate = mapItem.placemark.location.coordinate;
Annotation.title = Mapitem.name;
Annotation.url = Mapitem.url;
[Self.mapview addannotation:annotation];

We have only one annotation, select it ' s callout.
[Self.mapview selectannotation:[self.mapview.annotations objectatindex:0] animated:yes];
} else {
Self.title = @ "All Places";

ADD all the found annotations to the map.

For (Mkmapitem *item in self.mapitemlist) {
Placeannotation *annotation = [[Placeannotation alloc] init];
Annotation.coordinate = item.placemark.location.coordinate;
Annotation.title = Item.name;
Annotation.url = Item.url;
[Self.mapview addannotation:annotation];
}
}

10.
-(void) Mapviewdidfailloadingmap: (Mkmapview *) Mapview witherror: (nserror *) Error {
NSLog (@ "Failed to load the map:%@", error);
}

-(Mkannotationview *) Mapview: (Mkmapview *) Mapview viewforannotation: (id <MKAnnotation>) annotation
{
Mkpinannotationview *annotationview = nil;

if ([Annotation iskindofclass:[placeannotation class]]) {
Annotationview = (Mkpinannotationview *) [Self.mapview dequeuereusableannotationviewwithidentifier:@ "Pin"];

if (Annotationview = = nil) {
Annotationview = [[Mkpinannotationview alloc] initwithannotation:annotation reuseidentifier:@ "Pin"];
Annotationview.canshowcallout = YES;
Annotationview.animatesdrop = YES;
}
}
return annotationview;
}

11. Removeannotations when the interface is going to disappear
-(void) Viewdiddisappear: (BOOL) Animated {
[Super viewdiddisappear:animated];
[Self.mapview removeAnnotations:self.mapView.annotations];
}

Mapsearch Reading Essays