I currently have an XML model getting processed my an NSXMLParser; I get about 340 objects in my model after processing. I place all of the objects on my MKMapView. Once a user "selects" an object (MKAnnotationViewPin); once I start off, the title is populated, coords too (duh?) but the subtitle is set to a place-holder. I process another XML file to retrieve extra information, the subtitle gets updated and populated.
Once the XML file gets parsed I get notified and update its <MKAnnotation> object to reflect the changed subtitle. To reflect the change on the map I have to "unselect" the pin and click it again for it to show the change.
Here is my <MKAnnotation> object:
Header:
#interface CPCustomMapPin : NSObject <MKAnnotation>
{
NSString *_title;
NSString *_annotation;
CLLocationCoordinate2D _coords;
NSString *stationID;
}
#property (nonatomic, retain) NSString *_title;
#property (nonatomic, retain) NSString *_annotation;
#property (nonatomic) CLLocationCoordinate2D _coords;
#property (nonatomic, retain) NSString *stationID;
- (id) initWithTitle: (NSString *) _title withAnnotation: (NSString *) _annotation withCoords: (CLLocationCoordinate2D) _coords withStationID: (NSString *) _id;
Implementation:
#implementation CPCustomMapPin
#synthesize _title, _annotation, _coords, stationID;
- (id) initWithTitle: (NSString *) __title withAnnotation: (NSString *) __annotation withCoords: (CLLocationCoordinate2D) __coords withStationID: (NSString *) _id
{
_title = [[NSString alloc] init];
_annotation = [[NSString alloc] init];
stationID = [[NSString alloc] init];
[self set_title: __title];
[self set_annotation: __annotation];
[self set_coords: __coords];
[self setStationID: _id];
return self;
}
- (NSString *) title
{
return _title;
}
- (NSString *) subtitle
{
return _annotation;
}
- (CLLocationCoordinate2D) coordinate
{
return _coords;
}
- (NSString *) description
{
return [NSString stringWithFormat: #"title: %# subtitle: %# id: %#", _title, _annotation, stationID];
}
- (void) dealloc
{
[_title release];
[_annotation release];
[stationID release];
[super dealloc];
}
#end
Thank you for your valuable input.
Apparently no one knows… I just found this technique:
- (void) closeAnnotation: (id <MKAnnotation>) annotation inMapView: (MKMapView *) mapView
{
[mapView deselectAnnotation: annotation animated: NO];
[mapView selectAnnotation: annotation animated: YES];
}
And of course you call your method accordingly:
Example:
- (void) myMethod
{
for (id <MKAnnotation> _annotation in mapView.annotations)
{
[self closeAnnotation: _annotation inMapView: mapView];
}
}
Related
I am developing a macOS app using objective-C.
I tried to save a NSArray object in Core Data. I write
- (id)reverseTransformedValue:(id)value
{
return [NSKeyedUnarchiver unarchivedObjectOfClass:[NSArray class] fromData:value error:nil];
}
in the class that inherits NSValueTransformer.
And one of elements in my NSArray object is not of primary kind(which has properties called courseName and courseInfos), so I conform in this element's class. In this class ,I write:
- (id)initWithCoder:(NSCoder *)aDecoder
{
self = [[self class] new];
if (self = [super init])
{
self.courseName = [aDecoder decodeObjectForKey:#"courseName"];
self.courseInfos = [aDecoder decodeObjectForKey:#"courseInfos"];
}
return self;
}
When my apps runs, the reverseTransformedValue: method is called, and all elements but that special nonprimary element in my NSArray object are decoded. I put a breakpoint in the initWithCoder: method in that special element's class, and it never runs. I use some tools and find that element is successfully stored in my core data, so its encoding process has no problem.
I Fixed it, here is the solution:
My object is 'Address' (note: it is not NSArray)
Address.h
#interface Address : NSObject <NSSecureCoding>
#property (nonatomic, strong) NSString *street;
#property (nonatomic, strong) NSString *city;
#end
Address.m
#implementation Address
- (id) initWithCoder:(NSCoder *)aDecoder
{
self = [self init];
if (self == nil)
{
return nil;
}
self.street = [aDecoder decodeObjectOfClass:[Address class] forKey:#"street"];
self.city = [aDecoder decodeObjectOfClass:[Address class]
forKey:#"city"];
return self;
}
- (void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject:self.street forKey:#"street"];
[encoder encodeObject:self.city forKey:#"city"];
}
+ (BOOL)supportsSecureCoding
{
return YES;
}
Archive.h
#property (nonatomic, strong) Address *address;
Archive.m
UserDBO *userDBO = [[UserDBO alloc] init];
// Archive
NSError *error = nil;
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:self.address requiringSecureCoding:YES error:&error];
if(error)
{
NSLog(#"archivedDataWithRootObject: %#", error);
}
userDBO.address = data;
// UnArchive
Address *address = [NSKeyedUnarchiver unarchivedObjectOfClass:[Address class] fromData:userDBO.address error:&error];
if(error)
{
NSLog(#"unarchivedObjectOfClass: %#", error);
}
UserDBO.h
#property (nonatomic, strong) NSData *address;
In my app, I am trying to save the pins that are on the map so that they are there when the user opens the app after it is terminated. I have conformed my mkAnnotation class to NSCoding, and implemented the two required methods. The annotations are all stored in a NSMutableArray in a singleton class, so I am really just trying to save the array in the singleton class. Everything is being encoded fine, but I do not think they are being decoded. Here is some code:
This is my MKAnnotation class:
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
#interface MapPoint : NSObject <MKAnnotation, NSCoding>
{
}
- (id)initWithAddress:(NSString*)address
coordinate:(CLLocationCoordinate2D)coordinate
title:(NSString *)t;
#property (nonatomic, readwrite) CLLocationCoordinate2D coordinate;
//This is an optional property from MKAnnotataion
#property (nonatomic, copy) NSString *title;
#property (nonatomic, readonly, copy) NSString *subtitle;
#property (nonatomic) BOOL animatesDrop;
#property (nonatomic) BOOL canShowCallout;
#property (copy) NSString *address;
#property (nonatomic, copy) NSString *imageKey;
#property (nonatomic, copy) UIImage *image;
#end
#implementation MapPoint
#synthesize title, subtitle, animatesDrop, canShowCallout, imageKey, image;
#synthesize address = _address, coordinate = _coordinate;
-(id)initWithAddress:(NSString *)address
coordinate:(CLLocationCoordinate2D)coordinate
title:(NSString *)t {
self = [super init];
if (self) {
_address = [address copy];
_coordinate = coordinate;
[self setTitle:t];
NSDate *theDate = [NSDate date];
subtitle = [NSDateFormatter localizedStringFromDate:theDate
dateStyle:NSDateFormatterShortStyle
timeStyle:NSDateFormatterShortStyle];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder {
[aCoder encodeObject:_address forKey:#"address"];
NSLog(#"ENCODING coordLatitude %f coordLongitude %f ", _coordinate.latitude, _coordinate.longitude);
[aCoder encodeDouble:_coordinate.longitude forKey:#"coordinate.longitude"];
[aCoder encodeDouble:_coordinate.latitude forKey:#"coordinate.latitude"];
[aCoder encodeObject:title forKey:#"title"];
}
- (id)initWithCoder:(NSCoder *)aDecoder {
self = [super init];
if (self) {
[self setAddress:[aDecoder decodeObjectForKey:#"address"]];
NSLog(#"DECODING coordLatitude %f coordLongitude %f ", _coordinate.latitude, _coordinate.longitude);
_coordinate.longitude = [aDecoder decodeDoubleForKey:#"coordinate.longitude"];
_coordinate.latitude = [aDecoder decodeDoubleForKey:#"coordinate.latitude"];
[self setTitle:[aDecoder decodeObjectForKey:#"title"]];
}
return self;
}
#end
Here is my singleton class:
#import <Foundation/Foundation.h>
#class MapPoint;
#interface Data : NSObject
{
NSMutableArray *_annotations;
}
#property (retain, nonatomic) NSMutableArray *annotations;
+ (Data *)singleton;
- (NSString *)pinArchivePath;
- (BOOL)saveChanges;
#end
#implementation Data
#synthesize annotations = _annotations;
+ (Data *)singleton {
static dispatch_once_t pred;
static Data *shared = nil;
dispatch_once(&pred, ^{
shared = [[Data alloc] init];
shared.annotations = [[NSMutableArray alloc]init];
});
return shared;
}
- (id)init {
self = [super init];
if (self) {
NSString *path = [self pinArchivePath];
_annotations = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
if (!_annotations) {
_annotations = [[NSMutableArray alloc]init];
}
}
return self;
}
- (NSString *)pinArchivePath {
NSArray *cachesDirectories = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachesDirectory = [cachesDirectories objectAtIndex:0];
return [cachesDirectory stringByAppendingPathComponent:#"pins.archive"];
}
- (BOOL)saveChanges {
NSString *path = [self pinArchivePath];
return [NSKeyedArchiver archiveRootObject:[Data singleton].annotations
toFile:path];
}
#end
In my viewDidLoad method on the map view controller, I try and place the annotations in the singleton array on the map with this:
for (MapPoint *mp in [Data singleton].annotations) {
[_worldView addAnnotation:mp];
}
The main problem is in the singleton method in these lines:
dispatch_once(&pred, ^{
shared = [[Data alloc] init];
shared.annotations = [[NSMutableArray alloc]init]; //<-- problem line
});
The shared = [[Data alloc] init]; line decodes and initializes the annotations array.
Then the shared.annotations = [[NSMutableArray alloc]init]; line re-creates and re-initializes the annotations array thus discarding the just-decoded annotations so the singleton always returns an empty array.
Remove the shared.annotations = [[NSMutableArray alloc]init]; line.
As already mentioned in the comment, the other minor issue, which causes simply confusion, is the placement of the NSLog where the coordinate is being decoded. The NSLog should be after the decode is done.
I have a mapView where users press to drop a pin. There may be multiple pins at one time, and each annotation view has a callout that pushes a new view to the stack when it is pressed. What I want to do is pass the title of the annotation view to the label in the second view.
Here is the code where I drop the pin:
-(void)press:(UILongPressGestureRecognizer *)recognizer
{
CGPoint touchPoint = [recognizer locationInView:worldView];
CLLocationCoordinate2D touchMapCoordinate = [worldView convertPoint:touchPoint toCoordinateFromView:worldView];
geocoder = [[CLGeocoder alloc]init];
CLLocation *location = [[CLLocation alloc]initWithCoordinate:touchMapCoordinate
altitude:CLLocationDistanceMax
horizontalAccuracy:kCLLocationAccuracyBest
verticalAccuracy:kCLLocationAccuracyBest
timestamp:[NSDate date]];
[geocoder reverseGeocodeLocation:location
completionHandler:^(NSArray *placemarks, NSError *error) {
NSLog(#"reverseGeocoder:completionHandler: called");
if (error) {
NSLog(#"Geocoder failed with error: %#", error);
} else {
CLPlacemark *place = [placemarks objectAtIndex:0];
address = [NSString stringWithFormat:#"%# %#, %# %#", [place subThoroughfare], [place thoroughfare], [place locality], [place administrativeArea]];
if (UIGestureRecognizerStateBegan == [recognizer state]) {
addressPin = [[MapPoint alloc]initWithCoordinate:touchMapCoordinate
title:address];
[worldView addAnnotation:addressPin];
}
}
}];
}
And here is the code where I call the second view:
-(void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
PinViewController *pinViewController = [[PinViewController alloc]init];
[self passValues];
[[self navigationController]pushViewController:pinViewController animated:YES];
}
You can override MKAnnotation (for example MyLocation)and declare in MyLocation.h file
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
#interface MyLocation : NSObject <MKAnnotation> {
NSNumber *identyfier;
NSString *_name;
NSString *_address;
CLLocationCoordinate2D _coordinate;
}
#property (copy) NSString *name;
#property (copy) NSString *address;
#property (copy) NSNumber *identyfier;
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
- (id)initWithName:(NSString*)name address:(NSString*)address
coordinate:(CLLocationCoordinate2D)coordinate identyfier:(NSNumber *) identyfier;
#end
in MyLocation.m file:
#import "MyLocation.h"
#implementation MyLocation
#synthesize name = _name;
#synthesize address = _address;
#synthesize coordinate = _coordinate;
#synthesize identyfier = _identyfier;
- (id)initWithName:(NSString*)name address:(NSString*)address
coordinate:(CLLocationCoordinate2D)coordinate identyfier:(NSNumber *)identyfier {
if ((self = [super init])) {
_name = [name copy];
_address = [address copy];
_coordinate = coordinate;
_identyfier = identyfier;
}
return self;
}
In your map view when you declare annotation use this methos:
MyLocation *pin = [[MyLocation alloc] initWithName:place.name address:place.address coordinate:coordinate2D identyfier:some_id];
So for example in your map delegate:
- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
you can use:
((MyLocation *)annotation).identyfier
to check selected annotation (of course you can use different variables in MyLocation class)
Usually when i need to pass variables i just create a global variable that then can be read by both view.
There is the
extern (NSString *)some_variable_name, which you put in the .h file and in the .m file you globally put (NSString *)some_variable_name ;
Which the can be read by all views
Or the + sign in front of you variable, which then can be read by all views that includes the view (setting the global at the top in the .m file, and in the .h file by the comman
something = [someview that_variable] ;
I'm trying to save the name of a button using a singleton so that the name can be accessed in another view to play a video with the same name. However, I'm getting the error: SIGABRT. I don't really see what's wrong with my code. Any ideas?
#import "List.h"
#import "MyManager.h"
#import "Video.h"
#implementation ExerciseList
-(IBAction) goToVideo:(UIButton *) sender{
MyManager *sharedManager = [MyManager sharedManager];
sharedManager.vidName = [[sender titleLabel] text];
Video *videoGo = [[Video alloc] initWithNibName: #"Video" bundle: nil];
[self.navigationController pushViewController: videoGo animated: YES];
[videoGo release];
}
Here is my .h and .m for MyManager:
#import <foundation/Foundation.h>
#interface MyManager : NSObject {
NSMutableArray *workouts;
NSString *vidName;
}
#property (nonatomic, retain) NSMutableArray *workouts;
#property (nonatomic, retain) NSString *vidName;
+ (id)sharedManager;
#end
#import "MyManager.h"
static MyManager *sharedMyManager = nil;
#implementation MyManager
#synthesize workouts;
#synthesize vidName;
#pragma mark Singleton Methods
+ (id)sharedManager {
#synchronized(self) {
if (sharedMyManager == nil)
sharedMyManager = [[self alloc] init];
}
return sharedMyManager;
}
- (id)init {
if ((self = [super init])) {
workouts = [[NSMutableArray alloc] init];
vidName = [[NSString alloc] init];
}
return self;
}
-(void) dealloc{
self.workouts = nil;
self.vidName = nil;
[super dealloc];
}
#end
You should access the title of the button
sharedManger.vidName = [sender currentTitle];
However you are not using ARC so also check where your vidName property is retain or copy.
if it is not retain or copy then you can use this code also
if(sharedManger.vidname != nil){
[sharedManger.vidName release];
sharedManger.vidName = nil;
}
sharedManger.vidName = [[sender currentTitle] retain];
I have the following object:
#interface SomeObject : NSObject
{
NSString *title;
}
#property (copy) NSString *title;
#end
And I have another object:
#interface AnotherObject : NSObject{
NSString *title;
}
#property (copy) NSString *title;
- (AnotherObject*)init;
- (void)dealloc;
- (void) initWithSomeObject: (SomeObject*) pSomeObject;
+ (AnotherObject*) AnotherObjectWithSomeObject (SomeObject*) pSomeObject;
#end
#implementation AnotherObject
#synthesize title
- (AnotherObject*)init {
if (self = [super init]) {
title = nil;
}
return self;
}
- (void)dealloc {
if (title) [title release];
[super dealloc];
}
-(void) initWithSomeObject: (SomeObject*) pSomeObject
{
title = [pSomeObject title]; //Here copy is not being invoked, have to use [ [pSomeObject title] copy]
}
+ (AnotherObject*) AnotherObjectWithSomeObject (SomeObject*) pSomeObject;
{
[pSomeObject retain];
AnotherObject *tempAnotherObject = [ [AnotherObject alloc] init];
[tempAnotherObject initWithSomeObject: pSomeObject];
[pSomeObject release];
return tempAnotherObject;
}
#end
I do not understand, why copy is not being invoked when I am assigning "title = [pSomeObject title]". I always thought if i set "copy" in property it is always going to be invoked. I have a error in my code or I don't understand something?
Thank you in advance.
For a setter to get called you need to use the dot notation.
self.title = [pSomeObject title];
or...to use the dot notation for pSomeObject too
self.title = pSomeObject.title;