iOS Programming

@autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }

Sol.:  TARGETS --> Summary --> Identifier  -->  xxx.yyyyyyyy.apps   (due to the Identifier)

Property 'title' 'copy' attribute does not match the property inherited from 'MKAnnotation'
Property 'subtitle' 'copy' attribute does not match the property inherited from 'MKAnnotation'


@interface MyAnnotation : NSObject <MKAnnotation> {
    CLLocationCoordinate2D coordinate;
    NSString *subtitle;  
    NSString *title;
}
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, retain) NSString *subtitle;  
@property (nonatomic, retain) NSString *title;

-(id)initWithCoordinate: (CLLocationCoordinate2D) coordinate;

@end

Sol:  Change it to:

@property (nonatomic, copy) NSString *subtitle;
@property (nonatomic, copy) NSString *title;

The MKAnnotation protocol declares

@property (nonatomic, readonly, copy) NSString *title;
@property (nonatomic, readonly, copy) NSString *subtitle;

You shouldn't change the storage type of a property, the only change you can / should make is from readonly to readwrite if needed;