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![About
Delegate
// Create location manager
LocationManager* lc = [[LocationManager
alloc] init];
// Who is receiving location updates? It’s
// someObject. What is someObject? It’s
// whatever object that implements a
// certain protocol!
[lc setDelegate: someObject];](https://image.slidesharecdn.com/delegation-core-location-pptx-121016031757-phpapp01/75/iOS-Frameworks-and-Delegation-5-2048.jpg)
![About
Delegate
// Create location manager
lc = [[LocationManager alloc] init];
// Set delegate this “this”-object
[lc setDelegate: self];](https://image.slidesharecdn.com/delegation-core-location-pptx-121016031757-phpapp01/75/iOS-Frameworks-and-Delegation-7-2048.jpg)
Uploaded byJussi Pohjolainen
iOS: Frameworks and Delegation
The document discusses iOS frameworks, delegation, and MapKit. It explains that frameworks are collections of classes added to apps, and common iOS frameworks include Cocoa Touch. Delegation is described as an object-oriented way of making callbacks, where an object implements methods from a protocol. MapKit is the framework for embedding maps, and it supports annotating maps and tracking user location via the MKMapViewDelegate protocol.
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iOS: Frameworks and Delegation
- 1. iOS: Frameworks, Delega3on and MapKit Jussi Pohjolainen Tampere University of Applied Sciences
- 2. About Frameworks • Framework is a collec3on of classes that are added to target • Target = the compiled iOS app • Cocoa Touch has several frameworks • You can add and remove frameworks in your project
- 3. NSString NSString needs the Founda3on framework!
- 4. Add a Framework Choose Target Select Build Phases Click + (Link Binary with Libraries)
- 5. About Delegate //Create location manager LocationManager* lc = [[LocationManager alloc] init]; // Who is receiving location updates? It’s // someObject. What is someObject? It’s // whatever object that implements a // certain protocol! [lc setDelegate: someObject];
- 6. Documenta3on Whatever object, but is has to implement CLoca3oinManager Delegate Protocol!
- 7. About Delegate //Create location manager lc = [[LocationManager alloc] init]; // Set delegate this “this”-object [lc setDelegate: self];
- 8. Implemen3ng a Delegate #import <UIKit/UIKit.h> #import <CoreLocation/CoreLocation.h> @interface MyLocationViewController : UIViewController<CLLocationManagerDelegate> { CLLocationManager *locationManager; }
- 9.
- 10. Implementa3on - (void)locationManager:(CLLocationManager*)manager didUpdateLocations:(NSArray *)locations { // Implementation here }
- 11. Delega3on • Delega3on: OO way of making callback • Send messages to some object. Some object must have methods that are defined in the protocol • The same than in Java – buUon.addAc3onlistener(Ac3onListener x) – Where x is an interface • By default, protocol methods are mandatory. But protocol may hold op-onal methods! • Typically in delegate protocols, the methods are op-onal
- 12. Delega3on • If delega3on protocol method is mandatory, it’s called without checking • If delega3on protocol method is op3onal, then checking is done: if target object contains this method, call it. – This happens in run3me, you don’t have to worry about this.
- 13. CLLoca3onManagerDelegate.h All methods are op3onal!
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- 16. MapKit Framework • Interface for embedding maps into view • Supports also – Annota3ng map – Adding overlay – Reverse geocoding • As of iOS 6 Apple uses it’s own maps instead of Google maps • Reference – hUp://developer.apple.com/library/ios/ #documenta3on/MapKit/Reference/ MapKit_Framework_Reference/_index.html
- 17. How? • Add MapKit framework to your project • Import MapKit – class – #import <MapKit/MapKit.h> • Use MKMapView object – IBOutlet MKMapView *worldView; • Show user loca3on? – Set showsUserLocation property to YES • Use MKMapViewDelegate protocol
- 18. MKMapViewDelegate This is called when user loca3on changes. In here you can get the coordinates and zoom in MapView
- 19. Annota3ons • Display something on a map: annota3on • Annota3on is any object that conforms to MKAnnotation protocol – These objects can be added to MKMapView • MKAnnota3on Reference – An object that adopts this protocol must implement the coordinate property. The other methods of this protocol are op3onal.
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- 21. Add MapPoint to Map