Iphone course 2
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The document discusses iPhone application development topics including Model View Controller (MVC), protocol, delegation, target/action, and location-based applications using CoreLocation and MapKit. It provides code examples of implementing MVC, delegation, adding annotations to maps, and making geolocation API requests. It proposes three location-based iPhone applications: Hello Location to display the user's current location on a map, Hello Map to add annotations to a map, and Hello Address to geocode an address and display the result.
![class RealPrinter { // the "delegate"
void print() {
System.out.print("something");
}
}
class Printer { // the "delegator"
RealPrinter p = new RealPrinter(); // create the delegate
void print() {
p.print(); // delegation
}
}
public class Main {
// to the outside world it looks like Printer actually prints.
public static void main(String[] args) {
Printer printer = new Printer();
printer.print();
}
}
java simple example](https://image.slidesharecdn.com/iphonecourse2-120207225006-phpapp01/85/Iphone-course-2-6-320.jpg)
![interface I {
void f();
void g();
}
class A implements I {
public void f() { System.out.println("A: doing f()"); }
public void g() { System.out.println("A: doing g()"); }
}
class B implements I {
public void f() { System.out.println("B: doing f()"); }
public void g() { System.out.println("B: doing g()"); }
}
class C implements I {
// delegation
I i = new A();
public void f() { i.f(); }
public void g() { i.g(); }
// normal attributes
public void toA() { i = new A(); }
public void toB() { i = new B(); }
}
public class Main {
public static void main(String[] args) {
C c = new C();
c.f(); // output: A: doing f()
c.g(); // output: A: doing g()
c.toB();
c.f(); // output: B: doing f()
c.g(); // output: B: doing g()
}
}
java complex example](https://image.slidesharecdn.com/iphonecourse2-120207225006-phpapp01/85/Iphone-course-2-7-320.jpg)
![@protocol I <NSObject>
-(void) f;
-(void) g;
@end
@interface A : NSObject <I> { } // constructor
@end -(id)init {
@implementation A if (self = [super init]) { i = [[A alloc] init]; }
-(void) f { NSLog(@"A: doing f"); } return self;
-(void) g { NSLog(@"A: doing g"); } }
@end
// destructor
@interface B : NSObject <I> { } -(void)dealloc { [i release]; [super dealloc]; }
@end @end
@implementation B
-(void) f { NSLog(@"B: doing f"); } int main (int argc, const char * argv[]) {
-(void) g { NSLog(@"B: doing g"); } NSAutoreleasePool * pool = [[NSAutoreleasePool alloc]
@end init];
C *c = [[C alloc] init];
@interface C : NSObject <I> { [c f]; // output: A: doing f
id<I> i; // delegation [c g]; // output: A: doing g
} [c toB];
-(void) toA; [c f]; // output: B: doing f
-(void) toB; [c g]; // output: B: doing g
@end [c release];
[pool drain];
@implementation C return 0;
-(void) f { [i f]; } }
-(void) g { [i g]; }
-(void) toA { [i release]; i = [[A alloc]
init]; }
-(void) toB { [i release]; i = [[B alloc]
init]; }](https://image.slidesharecdn.com/iphonecourse2-120207225006-phpapp01/85/Iphone-course-2-8-320.jpg)
![MKAnnotation
How to add an annotation on a map?
- implement a customized annotation using MKAnnotation protocol
@protocol MKAnnotation <NSObject>
@property (readonly) CLLocationCoordinate2D coordinate;
@optional
@property (readonly) NSString *title;
@property (readonly) NSString *subtitle;
@end
typedef {
CLLocationDegrees latitude;
CLLocationDegrees longitude;
} CLLocationCoordinate2D;
- add annotation to MKMapView
[mapView addAnnotation:myannotation];](https://image.slidesharecdn.com/iphonecourse2-120207225006-phpapp01/85/Iphone-course-2-24-320.jpg)
![#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
@interface MyAnnotation : NSObject <MKAnnotation>
{
CLLocationCoordinate2D coordinate;
NSString * title;
NSString * subtitle;
}
@property (nonatomic, assign) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString * title;
@property (nonatomic, copy) NSString * subtitle;
- (id)initWithCoordinate:(CLLocationCoordinate2D)coord;
@end MyAnnotation.h
#import "MyAnnotation.h"
@implementation MyAnnotation
@synthesize coordinate;
@synthesize title;
@synthesize subtitle;
- (id)initWithCoordinate:(CLLocationCoordinate2D)coord {
self = [super init];
if (self) {
coordinate = coord;
}
return self;
}
- (void) dealloc
{
[title release];
! [subtitle release];
[super dealloc];
}
@end MyAnnotation.m](https://image.slidesharecdn.com/iphonecourse2-120207225006-phpapp01/85/Iphone-course-2-25-320.jpg)
![http://maps.googleapis.com/maps/api/geocode/json?address=台北
101&sensor=true
{
"results" : [
{
"address_components" : [
{
"long_name" : "101縣道",
"short_name" : "101縣道",
"types" : [ "route" ]
},
{
"long_name" : "New Taipei City",
"short_name" : "New Taipei City",
"types" : [ "administrative_area_level_2", "political" ]
},
{
"long_name" : "Taiwan",
"short_name" : "TW",
"types" : [ "country", "political" ]
}
],
"formatted_address" : "Taiwan, New Taipei City, 101縣道",
"geometry" : {
"bounds" : {
"northeast" : {
"lat" : 25.26163510,
"lng" : 121.51636480
},
"southwest" : {
"lat" : 25.17235040,
"lng" : 121.44038660](https://image.slidesharecdn.com/iphonecourse2-120207225006-phpapp01/85/Iphone-course-2-27-320.jpg)
Iphone course 2
- 1. iPhone Application Development II Janet Huang 2011/11/30
- 2. Today’s topic • Model View Control • Protocol, Delegation, Target/Action • Location in iPhone • CoreLocation • MapKit • Location-based iPhone Application
- 3. MVC should did will target controller outlet count Notification de data da & KVO le ta ga action te so urc es model view
- 4. IBOutlet & IBAction target action controller view outlet #import <UIKit/UIKit.h> @interface HelloViewController : UIViewController { IBOutlet UILabel* display; } - (IBAction)pressButton:(id)sender; @end Interface Builder ViewController
- 5. Delegation pattern delegate delegate delegator (helper object)
- 6. class RealPrinter { // the "delegate" void print() { System.out.print("something"); } } class Printer { // the "delegator" RealPrinter p = new RealPrinter(); // create the delegate void print() { p.print(); // delegation } } public class Main { // to the outside world it looks like Printer actually prints. public static void main(String[] args) { Printer printer = new Printer(); printer.print(); } } java simple example
- 7. interface I { void f(); void g(); } class A implements I { public void f() { System.out.println("A: doing f()"); } public void g() { System.out.println("A: doing g()"); } } class B implements I { public void f() { System.out.println("B: doing f()"); } public void g() { System.out.println("B: doing g()"); } } class C implements I { // delegation I i = new A(); public void f() { i.f(); } public void g() { i.g(); } // normal attributes public void toA() { i = new A(); } public void toB() { i = new B(); } } public class Main { public static void main(String[] args) { C c = new C(); c.f(); // output: A: doing f() c.g(); // output: A: doing g() c.toB(); c.f(); // output: B: doing f() c.g(); // output: B: doing g() } } java complex example
- 8. @protocol I <NSObject> -(void) f; -(void) g; @end @interface A : NSObject <I> { } // constructor @end -(id)init { @implementation A if (self = [super init]) { i = [[A alloc] init]; } -(void) f { NSLog(@"A: doing f"); } return self; -(void) g { NSLog(@"A: doing g"); } } @end // destructor @interface B : NSObject <I> { } -(void)dealloc { [i release]; [super dealloc]; } @end @end @implementation B -(void) f { NSLog(@"B: doing f"); } int main (int argc, const char * argv[]) { -(void) g { NSLog(@"B: doing g"); } NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] @end init]; C *c = [[C alloc] init]; @interface C : NSObject <I> { [c f]; // output: A: doing f id<I> i; // delegation [c g]; // output: A: doing g } [c toB]; -(void) toA; [c f]; // output: B: doing f -(void) toB; [c g]; // output: B: doing g @end [c release]; [pool drain]; @implementation C return 0; -(void) f { [i f]; } } -(void) g { [i g]; } -(void) toA { [i release]; i = [[A alloc] init]; } -(void) toB { [i release]; i = [[B alloc] init]; }
- 9. Delegation • Delegate: a helper object can execute a task for the delegator • Delegator: delegate a task to the delegate delegate CLLocationManagerDelegate MyCoreLocationController the delegator the delegate (declare methods) (implement methods) @interface MyCoreLocationController : NSObject <CLLocationManagerDelegate> protocol
- 15. Location in iPhone • Core Location • framework for specifying location on the planet • MapKit • graphical toolkit for displaying locations on the planet
- 16. CoreLocation • A frameworks to manage location and heading • CLLocation (basic object) • CLLocationManager • CLHeading • No UI • How to get CLLocation? • use CLLocationManager
- 17. CoreLocation • Where is the location? (approximately) @property (readonly) CLLocationCoordinate2D coordinate; typedef { CLLocationDegrees latitude; CLLocationDegrees longitude; } CLLocationCoordinate2D; //meters A negative value means “below sea level.” @property(readonly)CLLocationDistancealtitude;
- 18. CoreLocation • How does it know the location? • GPS • Wifi • Cell network • The more accurate the technology, the more power it costs
- 19. CLLocationManager • General approach • Check to see if the hardware you are on/user supports the kind of location updating you want. • Create a CLLocationManager instance and set a delegate to receive updates. • Configure the manager according to what kind of location updating you want. • Start the manager monitoring for location changes.
- 20. CoreLocation • Accuracy-based continuous location monitoring @propertyCLLocationAccuracydesiredAccuracy; @property CLLocationDistance distanceFilter; • Start the monitoring - (void)startUpdatingLocation; - (void)stopUpdatingLocation; • Get notified via the CLLocationManager’s delegate - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation;
- 21. MapKit • Display a map • Show user location • Add annotations on a map
- 22. MKMapView • 2 ways to create a map • create with alloc/init • drag from Library in Interface builder • MKAnnotation
- 23. MKMapView • Controlling the region the map is displaying @property MKCoordinateRegion region; typedef struct { CLLocationCoordinate2D center; MKCoordinateSpan span; } MKCoordinateRegion; typedef struct { CLLocationDegrees latitudeDelta; CLLocationDegrees longitudeDelta; } // animated version - (void)setRegion:(MKCoordinateRegion)region animated:(BOOL)animated; • Can also set the center point only @property CLLocationCoordinate2D centerCoordinate; - (void)setCenterCoordinate:(CLLocationCoordinate2D)center animated:(BOOL)animated;
- 24. MKAnnotation How to add an annotation on a map? - implement a customized annotation using MKAnnotation protocol @protocol MKAnnotation <NSObject> @property (readonly) CLLocationCoordinate2D coordinate; @optional @property (readonly) NSString *title; @property (readonly) NSString *subtitle; @end typedef { CLLocationDegrees latitude; CLLocationDegrees longitude; } CLLocationCoordinate2D; - add annotation to MKMapView [mapView addAnnotation:myannotation];
- 25. #import <Foundation/Foundation.h> #import <MapKit/MapKit.h> @interface MyAnnotation : NSObject <MKAnnotation> { CLLocationCoordinate2D coordinate; NSString * title; NSString * subtitle; } @property (nonatomic, assign) CLLocationCoordinate2D coordinate; @property (nonatomic, copy) NSString * title; @property (nonatomic, copy) NSString * subtitle; - (id)initWithCoordinate:(CLLocationCoordinate2D)coord; @end MyAnnotation.h #import "MyAnnotation.h" @implementation MyAnnotation @synthesize coordinate; @synthesize title; @synthesize subtitle; - (id)initWithCoordinate:(CLLocationCoordinate2D)coord { self = [super init]; if (self) { coordinate = coord; } return self; } - (void) dealloc { [title release]; ! [subtitle release]; [super dealloc]; } @end MyAnnotation.m
- 26. Google Map API A geolocation api request: http://maps.googleapis.com/maps/api/geocode/output?parameters https://maps.googleapis.com/maps/api/geocode/output?parameters URL parameters: - address (required) - latlng (required) - sensor (required) - bounds - region - language http://code.google.com/apis/maps/documentation/geocoding/
- 27. http://maps.googleapis.com/maps/api/geocode/json?address=台北 101&sensor=true { "results" : [ { "address_components" : [ { "long_name" : "101縣道", "short_name" : "101縣道", "types" : [ "route" ] }, { "long_name" : "New Taipei City", "short_name" : "New Taipei City", "types" : [ "administrative_area_level_2", "political" ] }, { "long_name" : "Taiwan", "short_name" : "TW", "types" : [ "country", "political" ] } ], "formatted_address" : "Taiwan, New Taipei City, 101縣道", "geometry" : { "bounds" : { "northeast" : { "lat" : 25.26163510, "lng" : 121.51636480 }, "southwest" : { "lat" : 25.17235040, "lng" : 121.44038660
- 28. http://maps.googleapis.com/maps/api/geocode/xml?address= 台北101&sensor=true <?xml version="1.0" encoding="UTF-8"?> <GeocodeResponse> <status>OK</status> <result> <type>route</type> <formatted_address>Taiwan, New Taipei City, 101縣道</formatted_address> <address_component> <long_name>101縣道</long_name> <short_name>101縣道</short_name> <type>route</type> </address_component> <address_component> <long_name>New Taipei City</long_name> <short_name>New Taipei City</short_name> <type>administrative_area_level_2</type> <type>political</type> </address_component> <address_component> <long_name>Taiwan</long_name> <short_name>TW</short_name> <type>country</type> <type>political</type> </address_component> <geometry> <location> <lat>25.2012026</lat>
- 29. http://maps.google.com/maps/geo?q=台北101 { "name": "台北101", "Status": { "code": 200, "request": "geocode" }, "Placemark": [ { "id": "p1", "address": "Taiwan, New Taipei City, 101縣道", "AddressDetails": { "Accuracy" : 6, "Country" : { "AdministrativeArea" : { "AdministrativeAreaName" : "新北市", "Thoroughfare" : { "ThoroughfareName" : "101縣道" } http://maps.google.com/maps/geo?q=台北101&output=csv 200,6,25.2012026,121.4937590
- 31. Hello Location - get user current location - show a map - show current location - show location information
- 32. Hello Map - add an annotation on a map - add title and subtitle on this annotation
- 33. Hello Address - query an address using google geolocation api - show the result on the map