Objecive-Cで独自のPIN＆Annotationを使用する方法

また調べていて、あまりサンプルソースが見当たらなかったので自分メモ用に。

やりたかった事は単純にMKMapViewを利用してPINを立てる事と、Annotationの中に住所を入れて表示したかっただけです。

iOS5.1に対応しているので、位置情報はApple推奨のCLGeocoderを使用してます。

■LocationViewController
MKMapViewDelegate、CLLocationManagerDelegateを持っているViewControllerクラス
■MapAnnotation
Map表示時に、地図上に配置するAnnotationクラス
■CalloutAnnotation
PINをタップした際に呼ばれる、Annotationクラス
■CalloutAnnotationView
PINをタップした際に表示される、MKAnnotationViewクラス

LocationViewController.h



#import 

#import 

#import 
#import "TalkViewController.h"

#import "MapAnnotation.h"

#import "CalloutAnnotation.h"

#import "CalloutAnnotationView.h"


@interface LocationViewController : UIViewController 

{

@private

    BOOL first;

    int openMode;

}
@property (strong, nonatomic)id parent;

@property (strong, nonatomic)IBOutlet MKMapView *mapView;

@property (strong, nonatomic)CLLocationManager *locationManager;

@property (strong, nonatomic)CLLocation *presentLocation;

@property (strong, nonatomic)NSMutableDictionary* annotationDictionary;

@property (strong, nonatomic)NSString *addressTxt;


-  (id)initWithNibNameAndLocation:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil lat:(double)_lat lng:(double)_lng;
-  (IBAction)close:(id)sender;

-  (IBAction)focasLocation:(id)sender;

@end

LocationViewController.m


#import "LocationViewController.h"


@interface LocationViewController ()

@end


@implementation LocationViewController

@synthesize parent = _parent;

@synthesize mapView = _mapView;

@synthesize locationManager = _locationManager;

@synthesize presentLocation = _presentLocation;

@synthesize annotationDictionary = _annotationDictionary;

@synthesize addressTxt = _addressTxt;


#define KEY_CLEAR -1

enum LOCATION_VIEW_MODE

{ 

    LOCATION_TELL_MODE,  // When you tell your position.

    LOCATION_VIEW_MODE,  // When you show their posiiton.

};


-  (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])

    {

        first = YES;

        openMode = LOCATION_TELL_MODE;

    }

    return self;

}


- (id)initWithNibNameAndLocation:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil lat:(double)_lat lng:(double)_lng

{

    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])

    {

        first = YES;

        openMode = LOCATION_VIEW_MODE;
        MKCoordinateSpan CoordinateSpan = MKCoordinateSpanMake (0.005,0.005);                

        self.presentLocation= [[CLLocation alloc] initWithLatitude:_lat longitude:_lng];

        CLLocationCoordinate2D mapCenter = self.presentLocation.coordinate;

        MKCoordinateRegion CoordinateRegion = MKCoordinateRegionMake(mapCenter,CoordinateSpan);

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

        

    }

    return self;

}


-  (void)viewDidLoad

{

    LOG_FUNC

    [super viewDidLoad];

        

    // Do any additional setup after loading the view from its nib.

    self.title = @"マップ";

    

    self.mapView.delegate = self;

    self.mapView.mapType = MKMapTypeStandard;

    if (openMode == LOCATION_TELL_MODE)

        self.mapView.showsUserLocation =YES;

    

    if (self.locationManager == nil)

        self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;

    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest; // Accuracy is set up

    self.locationManager.distanceFilter = kCLDistanceFilterNone;    // Standard distance
    // Its present location information reception start.

    [self.locationManager startUpdatingLocation];

    

    self.annotationDictionary = [NSMutableDictionary dictionary];

}
-  (void)setPinToCoordinate:(CLLocation*)location

{

	// setup default span

	MKCoordinateSpan span;

	if (self.mapView.region.span.latitudeDelta > 100)

		span = MKCoordinateSpanMake(0.005, 0.005);

    else

		span = self.mapView.region.span;

    

	// set the map view to location

	CLLocationCoordinate2D centerCoordinate = location.coordinate;

	MKCoordinateRegion coordinateRegion =

    MKCoordinateRegionMake(centerCoordinate, span);

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

    

    // lat, lngから地名を逆引き。仕方ないのでココで実行

    CLGeocoder *geocoder = [[CLGeocoder alloc] init];

    [geocoder reverseGeocodeLocation:self.presentLocation completionHandler:^(NSArray *placemarks, NSError *error) 

     {

         if(placemarks && placemarks.count > 0)

         {

             CLPlacemark *topResult = [placemarks objectAtIndex:0];

             self.addressTxt = [NSString stringWithFormat:@"%@ %@ %@ %@ %@", 

                                [topResult name],

                                [topResult subAdministrativeArea],

                                [topResult administrativeArea],

                                [topResult postalCode],

                                [topResult country]];

          

             LOG(@"%@", self.addressTxt);
             // add annotation

             MapAnnotation *annotation = [[MapAnnotation alloc] init];

             annotation.coordinate = self.presentLocation.coordinate;

             annotation.title = self.addressTxt;
             [self.mapView addAnnotation:annotation];

             [self setAnnotation:annotation forCoordinate:location.coordinate];    

         }

     }];

}
-  (void)locationManager:(CLLocationManager *)manager

    didUpdateToLocation:(CLLocation *)newLocation

           fromLocation:(CLLocation *)oldLocation

{

    LOG_FUNC

    

    // Get location

    if (self.presentLocation == nil) 

        self.presentLocation = newLocation;
	if (first) 

    {

		first = NO;

		[self setPinToCoordinate:self.locationManager.location];

	}    

    

    LOG(@"lat = %f lng = %f", self.presentLocation.coordinate.latitude, self.presentLocation.coordinate.longitude);

    MKCoordinateSpan coordinateSpan = MKCoordinateSpanMake (0.005, 0.005);

    MKCoordinateRegion CoordinateRegion = MKCoordinateRegionMake(self.presentLocation.coordinate, coordinateSpan);

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

    

    [self.locationManager stopUpdatingLocation];

}
-  (void)locationManager:(CLLocationManager *)manager

       didFailWithError:(NSError *)error

{

    LOG_FUNC

    

    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"エラー" message:@"位置情報が取得できませんでした。" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];

    [alertView show];

}
#pragma mark - MapView delegate.

-  (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id)annotation

{  

    MKAnnotationView *annotationView;

    NSString *identifier;

    

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

    {

        // Map annotation.

        identifier = @"Pin";

        annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];

        

        if (annotationView == nil) 

        {

            annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];

        }

        annotationView.image = [UIImage imageNamed:@"location.png"];  

    }

    else if ([annotation isKindOfClass:[CalloutAnnotation class]])

    {

        // Callout annotation.

        identifier = @"Callout";

        annotationView = (CalloutAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];

        

        if (annotationView == nil) 

        {

            annotationView = [[CalloutAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];

        }

        

        //

        CalloutAnnotation *calloutAnnotation = (CalloutAnnotation *)annotation;

        ((CalloutAnnotationView *)annotationView).title = calloutAnnotation.title;

        [(CalloutAnnotationView *)annotationView initRect];

        [(CalloutAnnotationView *)annotationView presentPointingAtView:self.mapView inView:(CalloutAnnotationView *)annotationView];
        // Position adjustment of annotation 

        ((CalloutAnnotationView *)annotationView).centerOffset = CGPointMake(10, -80);

        

        UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self 

                                                                                     action:@selector(calloutTapped:)];

        [annotationView addGestureRecognizer:tapGesture];

    }

    

    annotationView.annotation = annotation;  

    return annotationView;

}


/*MKMapViewのピンをタッチせずにコールアウトを出す

-  (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views 

{

    [mapView selectAnnotation:[mapView.annotations lastObject] animated:YES];

}

*/
-  (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view

{

    LOG_FUNC

    if ([view.annotation isKindOfClass:[MapAnnotation class]])

    {

        // Selected the pin annotation.

        CalloutAnnotation *calloutAnnotation = [[CalloutAnnotation alloc] init];

        

        MapAnnotation *mapAnnotation = ((MapAnnotation *)view.annotation);

        calloutAnnotation.title = mapAnnotation.title;

        calloutAnnotation.coordinate = mapAnnotation.coordinate;

        mapAnnotation.calloutAnnotation = calloutAnnotation;

        [mapView addAnnotation:calloutAnnotation];

    }

}
-  (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view

{

    LOG_FUNC

    if ([view.annotation isKindOfClass:[MapAnnotation class]])

    {

        // Deselected the pin annotation.

        MapAnnotation *mapAnnotation = ((MapAnnotation *)view.annotation);

        

        [mapView removeAnnotation:mapAnnotation.calloutAnnotation];

        mapAnnotation.calloutAnnotation = nil;

    }

}
// Processing when the tap of the annotation is carried out 

-  (void) calloutTapped:(id) sender 

{ 

    LOG_FUNC

    if (openMode == LOCATION_TELL_MODE)

    {

        MKCoordinateSpan coordinateSpan = MKCoordinateSpanMake(0.005,0.005);

        MKCoordinateRegion CoordinateRegion = MKCoordinateRegionMake(self.presentLocation.coordinate ,coordinateSpan);

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

        

        // lat, lngから地名を逆引き。仕方ないのでココで実行

        CLGeocoder *geocoder = [[CLGeocoder alloc] init];

        [geocoder reverseGeocodeLocation:self.presentLocation completionHandler:^(NSArray *placemarks, NSError *error) 

         {

             if(placemarks && placemarks.count > 0)

             {

                 CLPlacemark *topResult = [placemarks objectAtIndex:0];

                 NSString* txt = [NSString stringWithFormat:@"%@\n%@\n%@\n%@\n%@", 

                                  [topResult name],

                                  [topResult subAdministrativeArea],

                                  [topResult administrativeArea],

                                  [topResult postalCode],

                                  [topResult country]];

                 

                 [self.parent willCloseLocationPicker:txt lat:self.presentLocation.coordinate.latitude lng:self.presentLocation.coordinate.longitude];

             }

         }];

    }

    else

    {

        [self selectMapPicker];

    }

}
-  (IBAction)close:(id)sender

{

    LOG_FUNC

    [self dismissModalViewControllerAnimated:YES];

}
-  (IBAction)focasLocation:(id)sender

{

    LOG_FUNC

    [self selectMapPicker];

}
-  (void)selectMapPicker

{

    UIActionSheet *as = [[UIActionSheet alloc] init];

    as.tag = 0;

    as.delegate = self;

    [as addButtonWithTitle:@"Open in Maps"];

    [as addButtonWithTitle:@"Directions From Current Location"];

    [as addButtonWithTitle:@"Send to Another Chat"];

    [as addButtonWithTitle:@"Cancel"];

    as.cancelButtonIndex = 3;

    //as.destructiveButtonIndex = 0;

    [as showInView:self.view];    

}
-  (void)actionSheet:(UIActionSheet*)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex 

{

    if (actionSheet.tag == 0) 

    {

        switch (buttonIndex)

        {

            case 0:  // "Open in Maps"

            {

                NSString* urlstr = [NSString stringWithFormat:@"http://maps.google.com/maps?q=%@@%1.6f,%1.6f",

                                    [self.addressTxt stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding], self.presentLocation.coordinate.latitude, self.presentLocation.coordinate.longitude];

                

                NSURL* url = [NSURL URLWithString: urlstr];

                if ([[UIApplication sharedApplication] canOpenURL:url])

                {

                    [[UIApplication sharedApplication] openURL:url];

                }

                break;

            }

            case 1:  // "Directions From Current Location"

            {

                NSString* urlstr = [NSString stringWithFormat:@"http://maps.google.com/maps?saddr=%1.6f,%1.6f&daddr=%1.6f,%1.6f&dirflg=w",

                                    self.presentLocation.coordinate.latitude, self.presentLocation.coordinate.longitude,

                                    self.locationManager.location.coordinate.latitude, self.locationManager.location.coordinate.longitude];

                

                NSURL* url = [NSURL URLWithString: urlstr];

                if ([[UIApplication sharedApplication] canOpenURL:url])

                {

                    [[UIApplication sharedApplication] openURL:url];

                }

                

                break;

            }

            case 2: // "Send to Another Chat"

            {

                UIAlertView *alert =

                [[UIAlertView alloc] initWithTitle:@"Sorry" message:@"工事中です"

                                          delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];

                [alert show];

                

                break;

            }

        }

    }

}
-  (void)viewDidUnload

{

    LOG_FUNC

    [super viewDidUnload];

    // Release any retained subviews of the main view.

    // e.g. self.myOutlet = nil;

}
-  (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    return (interfaceOrientation == UIInterfaceOrientationPortrait);

}
#pragma mark -

#pragma mark 

-  (void)setAnnotation:(MapAnnotation*)annotation forCoordinate:(CLLocationCoordinate2D)coordinate

{

	NSValue* coordinateValue = [NSValue value:&coordinate

								 withObjCType:@encode(CLLocationCoordinate2D)];

	[self.annotationDictionary setObject:annotation

								  forKey:coordinateValue];

}
-  (MapAnnotation*)annotationForCoordinate:(CLLocationCoordinate2D)coordinate

{

	NSValue* coordinateValue = [NSValue value:&coordinate

								 withObjCType:@encode(CLLocationCoordinate2D)];

	MapAnnotation* annotation = [self.annotationDictionary objectForKey:coordinateValue];

	[self.annotationDictionary removeObjectForKey:coordinateValue];

    

	return annotation;

}

@end

LocationViewController.xib

MapAnnotation.h



#import 

#import   

#import "CalloutAnnotation.h"
@interface MapAnnotation : NSObject  
@property (nonatomic) CLLocationCoordinate2D coordinate;

@property (strong , nonatomic) NSString *title;

@property (nonatomic, strong) CalloutAnnotation *calloutAnnotation;


@end

MapAnnotation.m



#import "MapAnnotation.h"
@implementation MapAnnotation

@synthesize coordinate = _coordinate;

@synthesize title = _title;

@synthesize calloutAnnotation = _calloutAnnotation;
@end

CalloutAnnotation.h



#import 

#import 


@interface CalloutAnnotation : NSObject 
@property (nonatomic, strong) NSString *title;

@property (nonatomic, readwrite) CLLocationCoordinate2D coordinate;
@end

CalloutAnnotation.m



#import "CalloutAnnotation.h"
@implementation CalloutAnnotation
@synthesize title = _title;

@synthesize coordinate = _coordinate;
@end

最後が一番重要な吹き出しを作成するCalloutAnnotationViewなんですが、これの描画周りはコチラをかなり利用させて貰いました。
ただし、吹き出しは常に上に出ていて欲しいので、その辺りを改変しました。
※MITライセンスとの事ですが、何か問題ありましたらご連絡下さい。

CalloutAnnotationView.h



#import 

#import 


@interface CalloutAnnotationView : MKAnnotationView

{

@private

    NSString *title;
@private

    UIColor	*backgroundColor;

    UIColor *textColor;

	UIFont *textFont;

    UIColor *borderColor;

    CGFloat borderWidth;

    

@private

    CGSize	bubbleSize;

	CGFloat	cornerRadius;

	BOOL highlight;

	CGFloat	sidePadding;

	CGFloat	topMargin;

	CGFloat	pointerSize;

	CGPoint	targetPoint;

}
@property (nonatomic, strong)NSString *title;

@property (nonatomic, strong)UIColor *backgroundColor;

@property (nonatomic, strong)UIColor *textColor;

@property (nonatomic, strong)UIFont *textFont;

@property (nonatomic, assign)UITextAlignment textAlignment;

@property (nonatomic, strong)UIColor *borderColor;

@property (nonatomic, assign)CGFloat borderWidth;


- (void)initRect;

- (void)presentPointingAtView:(UIView *)targetView inView:(UIView *)containerView;
@end

CalloutAnnotationView.m



//

//  CMPopTipView.m

//

//  Created by Chris Miles on 18/07/10.

//  Copyright (c) Chris Miles 2010-2012.

//

//  Permission is hereby granted, free of charge, to any person obtaining a copy

//  of this software and associated documentation files (the "Software"), to deal

//  in the Software without restriction, including without limitation the rights

//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

//  copies of the Software, and to permit persons to whom the Software is

//  furnished to do so, subject to the following conditions:

//  

//  The above copyright notice and this permission notice shall be included in

//  all copies or substantial portions of the Software.

//  

//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

//  THE SOFTWARE.

//


#import "CalloutAnnotationView.h"


@implementation CalloutAnnotationView

@synthesize title = _title;
@synthesize backgroundColor;

@synthesize textColor;

@synthesize textFont;

@synthesize textAlignment;

@synthesize borderColor;

@synthesize borderWidth;


#define TEXT_SIZE 10.0

#define TEXT_WIDTH 320.0


- (float)textHeight:(NSString*)text

{

	CGSize boundingSize = CGSizeMake (TEXT_WIDTH, CGFLOAT_MAX);

    

	//文字の横幅から高さを算出

	CGSize labelsize = [text sizeWithFont:[UIFont systemFontOfSize:TEXT_SIZE]

                        constrainedToSize:boundingSize

                            lineBreakMode:UILineBreakModeWordWrap];

    

    NSLog(@"%f", labelsize.width);

    NSLog(@"%f", labelsize.height);

	return labelsize.height;

}
// Initialize Rect

- (void)initRect

{

    self.opaque = NO;

    [self setFrame:CGRectMake (0, 0, TEXT_WIDTH, 0)];

    

    cornerRadius = 10.0;

    topMargin = 2.0;

    pointerSize = 12.0;

    sidePadding = 2.0;

    borderWidth = 1.0;

    

    self.textFont = [UIFont boldSystemFontOfSize:TEXT_SIZE];

    self.textColor = [UIColor whiteColor];

    self.textAlignment = UITextAlignmentCenter;

    self.backgroundColor = [UIColor grayColor];

    self.borderColor = [UIColor blackColor];    

}
// Initialize point

- (void)presentPointingAtView:(UIView *)targetView inView:(UIView *)containerView

{

    LOG_FUNC
	// Size of rounded rect

    CGFloat rectWidth = (int)(containerView.frame.size.width * 2 / 3);

    

	CGSize textSize = CGSizeZero;

    if (self.title != nil)

    {

        textSize= [self.title sizeWithFont:textFont constrainedToSize:CGSizeMake(rectWidth, 99999.0) lineBreakMode:UILineBreakModeWordWrap];

    }

	bubbleSize = CGSizeMake (textSize.width + cornerRadius * 2, textSize.height + cornerRadius * 2);

	    

    CGPoint targetOriginInContainer = [targetView convertPoint:CGPointMake(0.0, 0.0) toView:containerView];

    // Y coordinate of pointer target (within containerView)

    CGFloat pointerY = targetOriginInContainer.y;

	

	CGFloat W = containerView.frame.size.width;	

	CGPoint p  = [targetView.superview convertPoint:targetView.center toView:containerView];

	CGFloat x_p = p.x;

	CGFloat x_b = x_p - roundf(bubbleSize.width / 2);

	if (x_b < sidePadding) 

    {

		x_b = sidePadding;

	}

	if (x_b + bubbleSize.width + sidePadding > W)

    {

		x_b = W - bubbleSize.width - sidePadding;

	}

	if (x_p - pointerSize < x_b + cornerRadius)

    {

		x_p = x_b + cornerRadius + pointerSize;

	}

	if (x_p + pointerSize > x_b + bubbleSize.width - cornerRadius)

    {

		x_p = x_b + bubbleSize.width - cornerRadius - pointerSize;

	}

	

	CGFloat fullHeight = bubbleSize.height + pointerSize + 10.0;

	CGFloat y_b = pointerY - fullHeight;

	targetPoint = CGPointMake(x_p - x_b, fullHeight - 2.0);
	CGRect finalFrame = CGRectMake(x_b - sidePadding, y_b,

								   bubbleSize.width + sidePadding * 2, fullHeight);

   	

    self.alpha = 0.0;

    CGRect startFrame = finalFrame;

    startFrame.origin.y += 10;

    self.frame = startFrame;
    [self setNeedsDisplay];

    

    [UIView beginAnimations:nil context:nil];

    self.alpha = 1.0;

    self.frame = finalFrame;

    [UIView commitAnimations];

}
 

 - (id)initWithAnnotation:(id)annotation reuseIdentifier:(NSString *)reuseIdentifier

{

    LOG_FUNC

    self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier];
    if (self) 

    {

    }
    return self;

}
- (CGRect)bubbleFrame 

{

	CGRect bubbleFrame = CGRectMake(2.0, targetPoint.y - pointerSize - bubbleSize.height, bubbleSize.width, bubbleSize.height);

	return bubbleFrame;

}
- (CGRect)contentFrame 

{

	CGRect bubbleFrame = [self bubbleFrame];

	CGRect contentFrame = CGRectMake(bubbleFrame.origin.x + cornerRadius,

									 bubbleFrame.origin.y + cornerRadius,

									 bubbleFrame.size.width - cornerRadius * 2,

									 bubbleFrame.size.height - cornerRadius * 2);

	return contentFrame;

}
- (void)drawRect:(CGRect)rect 

{

    LOG_FUNC
	CGRect bubbleRect = [self bubbleFrame];

	CGContextRef c = UIGraphicsGetCurrentContext(); 

    

    CGContextSetRGBStrokeColor(c, 0.0, 0.0, 0.0, 1.0);	// black

	CGContextSetLineWidth(c, borderWidth);

    

	CGMutablePathRef bubblePath = CGPathCreateMutable();

	

    CGPathMoveToPoint(bubblePath, NULL, targetPoint.x, targetPoint.y);

	CGPathAddLineToPoint(bubblePath, NULL, targetPoint.x - pointerSize, targetPoint.y - pointerSize);

		

	CGPathAddArcToPoint(bubblePath, NULL,

						bubbleRect.origin.x, bubbleRect.origin.y + bubbleRect.size.height,

						bubbleRect.origin.x, bubbleRect.origin.y + bubbleRect.size.height - cornerRadius,

						cornerRadius);

	CGPathAddArcToPoint(bubblePath, NULL,

						bubbleRect.origin.x, bubbleRect.origin.y,

						bubbleRect.origin.x + cornerRadius, bubbleRect.origin.y,

						cornerRadius);

	CGPathAddArcToPoint(bubblePath, NULL,

						bubbleRect.origin.x + bubbleRect.size.width, bubbleRect.origin.y,

						bubbleRect.origin.x + bubbleRect.size.width, bubbleRect.origin.y + cornerRadius,

						cornerRadius);

	CGPathAddArcToPoint(bubblePath, NULL,

						bubbleRect.origin.x + bubbleRect.size.width, bubbleRect.origin.y+bubbleRect.size.height,

						bubbleRect.origin.x + bubbleRect.size.width - cornerRadius, bubbleRect.origin.y + bubbleRect.size.height,

						cornerRadius);

	CGPathAddLineToPoint(bubblePath, NULL, targetPoint.x + pointerSize, targetPoint.y - pointerSize);

    

	CGPathCloseSubpath(bubblePath);

    

	// Draw shadow

	CGContextAddPath(c, bubblePath);

    CGContextSaveGState(c);

	CGContextSetShadow(c, CGSizeMake(0, 3), 5);

	CGContextSetRGBFillColor(c, 0.0, 0.0, 0.0, 0.9);

	CGContextFillPath(c);

    CGContextRestoreGState(c);
	// Draw clipped background gradient

	CGContextAddPath(c, bubblePath);

	CGContextClip(c);

	CGFloat bubbleMiddle = (bubbleRect.origin.y + (bubbleRect.size.height / 2)) / self.bounds.size.height;
    

	CGGradientRef myGradient;

	CGColorSpaceRef myColorSpace;

	size_t locationCount = 5;

	CGFloat locationList[] = {0.0, bubbleMiddle - 0.03, bubbleMiddle, bubbleMiddle + 0.03, 1.0};

    

	CGFloat colourHL = 0.0;

	if (highlight)

		colourHL = 0.25;

	

	CGFloat red;

	CGFloat green;

	CGFloat blue;

	CGFloat alpha;

	int numComponents = CGColorGetNumberOfComponents([backgroundColor CGColor]);

	const CGFloat *components = CGColorGetComponents([backgroundColor CGColor]);

	if (numComponents == 2) 

    {

		red = components[0];

		green = components[0];

		blue = components[0];

		alpha = components[1];

	}

	else

    {

		red = components[0];

		green = components[1];

		blue = components[2];

		alpha = components[3];

	}

	CGFloat colorList[] = {

		//red, green, blue, alpha 

		red*1.16+colourHL, green*1.16+colourHL, blue*1.16+colourHL, alpha,

		red*1.16+colourHL, green*1.16+colourHL, blue*1.16+colourHL, alpha,

		red*1.08+colourHL, green*1.08+colourHL, blue*1.08+colourHL, alpha,

		red     +colourHL, green     +colourHL, blue     +colourHL, alpha,

		red     +colourHL, green     +colourHL, blue     +colourHL, alpha

	};

	myColorSpace = CGColorSpaceCreateDeviceRGB();

	myGradient = CGGradientCreateWithColorComponents(myColorSpace, colorList, locationList, locationCount);

	CGPoint startPoint, endPoint;

	startPoint.x = 0;

	startPoint.y = 0;

	endPoint.x = 0;

	endPoint.y = CGRectGetMaxY(self.bounds);

	

	CGContextDrawLinearGradient(c, myGradient, startPoint, endPoint,0);

	CGGradientRelease(myGradient);

	CGColorSpaceRelease(myColorSpace);

    

    

    //Draw Border

    int numBorderComponents = CGColorGetNumberOfComponents([borderColor CGColor]);

    const CGFloat *borderComponents = CGColorGetComponents(borderColor.CGColor);

    CGFloat r, g, b, a;

	if (numBorderComponents == 2) 

    {

		r = borderComponents[0];

		g = borderComponents[0];

		b = borderComponents[0];

		a = borderComponents[1];

	}

	else

    {

		r = borderComponents[0];

		g = borderComponents[1];

		b = borderComponents[2];

		a = borderComponents[3];

	}

    

	CGContextSetRGBStrokeColor(c, r, g, b, a);

	CGContextAddPath(c, bubblePath);

	CGContextDrawPath(c, kCGPathStroke);

	

	CGPathRelease(bubblePath);

	

	// Draw text

	if (self.title) 

    {

		[textColor set];

		CGRect textFrame = [self contentFrame];

        [self.title drawInRect:textFrame

                        withFont:textFont

                   lineBreakMode:UILineBreakModeWordWrap

                       alignment:UITextAlignmentCenter];

    }

}

@end

DRY

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Objecive-Cで独自のPIN＆Annotationを使用する方法