/*

File: MapViewController.m

Abstract: The primary view controller containing the MKMapView, adding and removing both MKPinAnnotationViews through its toolbar.

Version: 1.2

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*/

#import "MapViewController.h"

#import "DetailViewController.h"

#import "SFAnnotation.h"

#import "BridgeAnnotation.h"

enum

{

kCityAnnotationIndex = 0,

kBridgeAnnotationIndex

};

@implementation MapViewController

@synthesize mapView, detailViewController, mapAnnotations;

#pragma mark -

+ (CGFloat)annotationPadding;

{

return 10.0f;

}

+ (CGFloat)calloutHeight;

{

return 40.0f;

}

- (void)gotoLocation

{

// start off by default in San Francisco

MKCoordinateRegion newRegion;

newRegion.center.latitude = 37.786996;

newRegion.center.longitude = -122.440100;

newRegion.span.latitudeDelta = 0.112872;

newRegion.span.longitudeDelta = 0.109863;

[self.mapView setRegion:newRegion animated:YES];

}

- (void)viewDidAppear:(BOOL)animated

{

// bring back the toolbar

[self.navigationController setToolbarHidden:NO animated:NO];

}

- (void)viewDidLoad

{

self.mapView.mapType = MKMapTypeStandard; // also MKMapTypeSatellite or MKMapTypeHybrid

// create a custom navigation bar button and set it to always says "Back"

UIBarButtonItem *temporaryBarButtonItem = [[UIBarButtonItem alloc] init];

temporaryBarButtonItem.title = @"Back";

self.navigationItem.backBarButtonItem = temporaryBarButtonItem;

[temporaryBarButtonItem release];

// create out annotations array (in this example only 2)

self.mapAnnotations = [[NSMutableArray alloc] initWithCapacity:2];

// annotation for the City of San Francisco

SFAnnotation *sfAnnotation = [[SFAnnotation alloc] init];

[self.mapAnnotations insertObject:sfAnnotation atIndex:kCityAnnotationIndex];

[sfAnnotation release];

// annotation for Golden Gate Bridge

BridgeAnnotation *bridgeAnnotation = [[BridgeAnnotation alloc] init];

[self.mapAnnotations insertObject:bridgeAnnotation atIndex:kBridgeAnnotationIndex];

[bridgeAnnotation release];

[self gotoLocation]; // finally goto San Francisco

}

- (void)viewDidUnload

{

self.mapAnnotations = nil;

self.detailViewController = nil;

self.mapView = nil;

}

- (void)dealloc

{

[mapView release];

[detailViewController release];

[mapAnnotations release];

[super dealloc];

}

#pragma mark -

#pragma mark ButtonActions

- (IBAction)cityAction:(id)sender

{

[self gotoLocation];//•• avoid this by checking its region from ours??

[self.mapView removeAnnotations:self.mapView.annotations]; // remove any annotations that exist

[self.mapView addAnnotation:[self.mapAnnotations objectAtIndex:kCityAnnotationIndex]];

}

- (IBAction)bridgeAction:(id)sender

{

[self gotoLocation];

[self.mapView removeAnnotations:self.mapView.annotations]; // remove any annotations that exist

[self.mapView addAnnotation:[self.mapAnnotations objectAtIndex:kBridgeAnnotationIndex]];

}

- (IBAction)allAction:(id)sender

{

[self gotoLocation];

[self.mapView removeAnnotations:self.mapView.annotations]; // remove any annotations that exist

[self.mapView addAnnotations:self.mapAnnotations];

}

#pragma mark -

#pragma mark MKMapViewDelegate

- (void)showDetails:(id)sender

{

// the detail view does not want a toolbar so hide it

[self.navigationController setToolbarHidden:YES animated:NO];

[self.navigationController pushViewController:self.detailViewController animated:YES];

}

- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>)annotation

{

// if it's the user location, just return nil.

if ([annotation isKindOfClass:[MKUserLocation class]])

return nil;

// handle our two custom annotations

//

if ([annotation isKindOfClass:[BridgeAnnotation class]]) // for Golden Gate Bridge

{

// try to dequeue an existing pin view first

static NSString* BridgeAnnotationIdentifier = @"bridgeAnnotationIdentifier";

MKPinAnnotationView* pinView = (MKPinAnnotationView *)

[mapView dequeueReusableAnnotationViewWithIdentifier:BridgeAnnotationIdentifier];

if (!pinView)

{

// if an existing pin view was not available, create one

MKPinAnnotationView* customPinView = [[[MKPinAnnotationView alloc]

initWithAnnotation:annotation reuseIdentifier:BridgeAnnotationIdentifier] autorelease];

customPinView.pinColor = MKPinAnnotationColorPurple;

customPinView.animatesDrop = YES;

customPinView.canShowCallout = YES;

// add a detail disclosure button to the callout which will open a new view controller page

//

// note: you can assign a specific call out accessory view, or as MKMapViewDelegate you can implement:

// - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control;

//

UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

[rightButton addTarget:self

action:@selector(showDetails:)

forControlEvents:UIControlEventTouchUpInside];

customPinView.rightCalloutAccessoryView = rightButton;

return customPinView;

}

else

{

pinView.annotation = annotation;

}

return pinView;

}

else if ([annotation isKindOfClass:[SFAnnotation class]]) // for City of San Francisco

{

static NSString* SFAnnotationIdentifier = @"SFAnnotationIdentifier";

MKPinAnnotationView* pinView =

(MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:SFAnnotationIdentifier];

if (!pinView)

{

MKAnnotationView *annotationView = [[[MKAnnotationView alloc] initWithAnnotation:annotation

reuseIdentifier:SFAnnotationIdentifier] autorelease];

annotationView.canShowCallout = YES;

UIImage *flagImage = [UIImage imageNamed:@"flag.png"];

CGRect resizeRect;

resizeRect.size = flagImage.size;

CGSize maxSize = CGRectInset(self.view.bounds,

[MapViewController annotationPadding],

[MapViewController annotationPadding]).size;

maxSize.height -= self.navigationController.navigationBar.frame.size.height + [MapViewController calloutHeight];

if (resizeRect.size.width > maxSize.width)

resizeRect.size = CGSizeMake(maxSize.width, resizeRect.size.height / resizeRect.size.width * maxSize.width);

if (resizeRect.size.height > maxSize.height)

resizeRect.size = CGSizeMake(resizeRect.size.width / resizeRect.size.height * maxSize.height, maxSize.height);

resizeRect.origin = (CGPoint){0.0f, 0.0f};

UIGraphicsBeginImageContext(resizeRect.size);

[flagImage drawInRect:resizeRect];

UIImage *resizedImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

annotationView.image = resizedImage;

annotationView.opaque = NO;

UIImageView *sfIconView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"SFIcon.png"]];

annotationView.leftCalloutAccessoryView = sfIconView;

[sfIconView release];

return annotationView;

}

else

{

pinView.annotation = annotation;

}

return pinView;

}

return nil;

}

@end