I have been trying to map to xml for weather. The xml looks like this
<current_observation>
<observation_epoch>1433740800</observation_epoch>
<weather>Clear</weather>
<temp_c>24</temp_c>
<relative_humidity>61%</relative_humidity>
<wind_dir>North</wind_dir>
<wind_mph>0</wind_mph>
<visibility_km>N/A</visibility_km>
</current_observation>
My weather.h
#interface Weather : NSObject
#property (nonatomic , copy) NSString* weather;
#property (nonatomic , copy) NSString* temp_c;
#property (nonatomic , copy) NSString* relative_humidity;
#property (nonatomic , copy) NSString* wind_dir;
#property (nonatomic , copy) NSString* wind_mph;
#property (nonatomic , copy) NSString* visibility_km;
#property (nonatomic , copy) NSString* observation_epoch;
#end
My mapping function
- (RKObjectManager*) makeWeatherXMLMappingwithURL:(NSString*)mLinkURL{
//Map the Weather class
RKObjectMapping* weatherMapping = [RKObjectMapping mappingForClass:[Weather class]];
[weatherMapping addAttributeMappingsFromDictionary:#{
#"weather.text":#"weather",
#"temp_c.text":#"temp_c",
#"relative_humidity.text":#"relative_humidity",
#"wind_dir.text":#"wind_dir",
#"wind_mph.text":#"wind_mph",
#"visibility_km.text":#"visibility_km",
#"observation_epoch.text":#"observation_epoch"
}];
//register mappings with the provider using a response descriptor
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping: weatherMapping
method: RKRequestMethodAny
pathPattern: nil
keyPath: #"current_observation"
//keyPath:#"rss.channel.item"
statusCodes: RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
//Initialize RestKit for xml (rss/feed) parsing & mapping
NSURL *baseURL = [NSURL URLWithString: mLinkURL];
//make a new instance of RKObjectManager (Parser which inherits from RKObjectManager)
RKObjectManager *objectManager = [Parser managerWithBaseURL:baseURL];
[objectManager setRequestSerializationMIMEType:RKMIMETypeTextXML];
// [objectManager setAcceptHeaderWithMIMEType:#"application/rss+xml"];
[objectManager setAcceptHeaderWithMIMEType:#"text/xml"];
// [RKMIMETypeSerialization registerClass:[RKXMLReaderSerialization class] forMIMEType:#"application/rss+xml"];
[RKMIMETypeSerialization registerClass:[RKXMLReaderSerialization class] forMIMEType:#"text/xml"];
//add the responseDescriptor to RKObjectManager
[objectManager addResponseDescriptor:responseDescriptor];
return objectManager;
}
My call
- (void) parseWeatherXMLwithURL:(NSString*)mLinkURL{
//Make the XML Mapping
RKObjectManager* objectManager = [self makeWeatherXMLMappingwithURL:mLinkURL];
//asychronous mapping (Calling getObjectsAtPath doesn't block the thread until it has completed)
[objectManager getObjectsAtPath:#""
parameters:nil
//Asynchronous Success block
success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
NSArray *weather = mappingResult.array;
if (weather!=nil && [weather count]>0){
//Delegate response to processAsynchronousLiveStreamingRSSComplete Handler
[self.delegate performSelector:#selector(processAsynchronousXMLWeatherComplete:) withObject:(Item*)[weather objectAtIndex:0]];
}
else{
NSMutableDictionary* details = [NSMutableDictionary dictionary];
[details setValue:#"Data is not available!" forKey:NSLocalizedDescriptionKey];
NSError *error = [NSError errorWithDomain:#"Data is not available!" code:200 userInfo:details];
//Delegate response to processAsynchronousLiveStreamingRSSFailed Handler
[self.delegate performSelector:#selector(processAsynchronousXMLWeatherFailed:) withObject:error];
}
}
//Asynchronous Failed block
failure:^(RKObjectRequestOperation *operation, NSError *error) {
//Delegate response to processAsynchronousLiveStreamingRSSFailed Handler
[self.delegate performSelector:#selector(processAsynchronousXMLWeatherFailed:) withObject:error];
}];
}
After my call i get 1key/value pair which is #"current_observation":#"0 objects". I think that this means it maps to the root element - current-observation - but it cannot map to the rest of the elements.
Finally i got the solution. I had to rename my class "weather" to "WeatherCO" -can be renamed to anything-, clean and rebuild my project and everything was fixed!
Related
Just started programming on objective-c and now i have issue with which can't deal by myself. I'm receiving data from asynchronous request and try to delver it to singleton, but it's not changed.
This is where i'm trying to store my data
Data.h
#import <Foundation/Foundation.h>
#interface Data : NSObject
#property (nonatomic, strong) NSDictionary *products;
-(void)setProducts:(NSDictionary *)value;
#end
Data.m
#import "Data.h"
#implementation Data
+(Data *)sharedInstance
{
static Data *_sharedInstance = nil;
static dispatch_once_t oncePredicate;
dispatch_once(&oncePredicate, ^{
_sharedInstance = [[Data alloc] init];
});
return _sharedInstance;
}
- (id)init {
self = [super init];
if ( self )
{
_products = [[NSDictionary alloc] init];
}
return self;
}
#end
This is the class, where i'm receiving data from server:
ConnectionService.m
- (void)getProductsWithCompletion:(void (^)(NSDictionary *products))completion
{
NSString *urlString = [NSString stringWithFormat:#"serverurl", [[AppDelegate instance]getUrl]];
NSURL *url = [NSURL URLWithString:urlString];
NSURLSessionDataTask *getData = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error){
NSString *rawJson = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSDictionary *value = [rawJson JSONValue];
completion(value);
}];
[getData resume];
}
This is the class where i'm calling request and try to deliver it to singleton:
viewController.m
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:YES];
[[ConnectionService instance] getProductsWithCompletion:^(NSDictionary *products) {
[Data sharedInstance].products = products;
NSLog(#"products: %#", [[Data sharedInstance] products]);//all is working, products contains data
}];
// checking received data
NSDictionary *tmp = [[Data sharedInstance] products];
NSLog(#"tmp: %#", tmp); //now it's null
}
The issue is the fact that the request is asynchronous and things aren't happening in the order you expect:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:YES];
[[ConnectionService instance] getProductsWithCompletion:^(NSDictionary *products) {
// (2)
[Data sharedInstance].products = products;
NSLog(#"products: %#", [[Data sharedInstance]products]);//all is working, products contains data
}];
// (1)
NSDictionary *tmp = [[Data sharedInstance]products];
NSLog(#"tmp: %#", tmp); //now it's null
}
In the code you posted, (1) will happen before (2). That's because (2) is part of the completion block and is set to run once the network request has completed and all the data has been parsed and is ready to use. While that asynchronous request is prepared and run in a background thread, the main thread ((1)) continues and executes before the request has taken place.
To resolve the issue, move your logging into the completion routine, or simply remove (1).
Another way is to use protocol, to notify your completion block is finished.So that you can simply do:
[[ConnectionService instance] getProductsWithCompletion:^(NSDictionary *products) {
if(self.delegate){
[self.delegate myNotifyMethod:products];
}
}];
and your protocol method:
-(void)myNotifyMethod:(NSDictionary *)items{
[Data sharedInstance].products = products;
NSLog(#"products: %#", [[Data sharedInstance]products]);
}
You can declare the protocol as:
#protocol MyProtocol <NSObject>
- (void)myNotifyMethod: (NSDictionary *)items;
#end
and set the delegate property as:
#property (nonatomic, weak) id<MyProtocol> delegate;
This is .h file as I have declared
#protocol CoreData <NSObject>
-(NSManagedObjectContext *)managedObjectContext;
#end
#interface coreData : NSObject
{
id<CoreData> delegate;
}
#property (retain)id delegate;
#property (readonly,strong ,nonatomic) NSManagedObjectContext *managedObjectContext;
#property (readonly,strong ,nonatomic) NSManagedObjectModel *managedObjectModel;
#property (readonly,strong ,nonatomic) NSPersistentStoreCoordinator *persistStoreCoordinator;
-(void)saveContext;
-(NSURL *)applicationDocumentsDirectory;
#end
This is .m file
#implementation coreData
#synthesize managedObjectContext = _managedObjectContext;
#synthesize managedObjectModel = _managedObjectModel;
#synthesize persistStoreCoordinator = _persistStoreCoordinator;
-(void)saveContext
{
NSError *error = nil;
NSManagedObjectContext *managedObjectContext = self.managedObjectContext;
if(managedObjectContext !=nil)
{
if([managedObjectContext hasChanges] && ![managedObjectContext save:&error]){
NSLog(#"Unresolved error %#,%#",error,[error userInfo]);
abort();
}
}
}
#pragma mark -core data stack
-(NSManagedObjectContext *)managedObjectContext
{
if(_managedObjectContext !=nil)
{
return _managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator =[self persistStoreCoordinator];
if (coordinator !=nil)
{
_managedObjectContext=[[NSManagedObjectContext alloc] init];
[_managedObjectContext setPersistentStoreCoordinator:coordinator];
}
return _managedObjectContext;
}
-(NSManagedObjectModel *)managedObjectModel
{
if(_managedObjectModel !=nil)
{
return _managedObjectModel;
}
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:#"Superallocation" withExtension:#"momd"];
_managedObjectModel =[[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return _managedObjectModel;
}
-(NSPersistentStoreCoordinator *)persistStoreCoordinator
{
if(_persistStoreCoordinator !=nil)
{
return _persistStoreCoordinator;
}
NSURL *storeURL =[[self applicationDocumentsDirectory] URLByAppendingPathComponent:#"SuperantZ.sqlite"];
NSError *error = nil;
_persistStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if([_persistStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error])
{
NSLog(#"unresolved error %#,%#",error,[error userInfo]);
abort();
}
return _persistStoreCoordinator;
}
-(NSURL *)applicationDocumentsDirectory
{
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
}
Questions:
How to declare core data in view controller not in AppDelegate class?
While using this code in AppDelegate its working why?
After I place in the normal class it is giving me error
like=[AppDelegate managedObjectContext]
2.while using this code in AppDelegate its working why?
3.After i place in the normal class its giving me error like=[AppDelegate managedObjectContext]
There's your answer - it still thinks the code is in the app delegate.
This
[AppDelegate managedObjectContext]
should be
[coreData managedObjectContext]
And everything needs to be wired up properly for this to work.
Incidentally, calling a class 'coreData' is pretty horrible. I'll forget about the missing capital letter (Obj-C classes traditionally start with a capital to reinforce that they are classes), the reason I point it out is you are using the name of something that already exists (bar one letter) and could become insanely confusing down the line.
2 suggestions
Rename the class to something sensible.
Make the class a singleton that can be called from anywhere.
I'm sorry to ask this question again, but I'm still stuck.
I have a city object trying to fetch weather from a weather fetcher object
#interface WeatherFetcher : NSObject {
}
#property (nonatomic, strong) NSMutableDictionary *weatherData;
- (void)fetchWeather:(NSString *)cityName;
- (void)handleNetworkErorr:(NSError *)error;
- (void)handleNetworkResponse:(NSData *)myData;
#end
This is were I assign the value to weatherData
#import "WeatherFetcher.h"
#implementation WeatherFetcher
- (void)fetchWeather:(NSString *)cityName
{
NSString *urlString = #"http://api.openweathermap.org/data/2.5/weather?q=";
urlString = [urlString stringByAppendingString:cityName];
urlString = [urlString stringByAppendingString:#",Aus"];
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
if (connectionError)
{
[self handleNetworkErorr:connectionError];
}
else
{
[self handleNetworkResponse:data];
}
}];
}
#pragma mark - Private Failure Methods
- (void)handleNetworkErorr:(NSError *)error
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Network Error" message:#"Please try again later" delegate:nil cancelButtonTitle:nil otherButtonTitles:#"OK", nil];
[alert show];
}
#pragma mark - Private Success Methods
- (void)handleNetworkResponse:(NSData *)myData
{
//NSMutableDictionary *data = [NSMutableDictionary dictionary];
NSMutableDictionary *data = [[NSMutableDictionary alloc] init];
// now we'll parse our data using NSJSONSerialization
id myJSON = [NSJSONSerialization JSONObjectWithData:myData options:NSJSONReadingMutableContainers error:nil];
// typecast an array and list its contents
NSDictionary *jsonArray = (NSDictionary *)myJSON;
//NSLog([jsonArray description]);
// take a look at all elements in the array
for (id element in jsonArray) {
id key = [element description];
id innerArr = [jsonArray objectForKey:key];
NSDictionary *inner = (NSDictionary *)innerArr;
if ([inner conformsToProtocol:#protocol(NSFastEnumeration)]) {
for(id ele in inner) {
if ([ele conformsToProtocol:#protocol(NSFastEnumeration)]) {
NSDictionary *innerInner = (NSDictionary *)ele;
for(id eleEle in innerInner) {
id innerInnerKey = [eleEle description];
[data setObject:[[inner valueForKey:innerInnerKey] description] forKey:[eleEle description]];
}
}
else {
id innerKey = [ele description];
[data setObject:[[inner valueForKey:innerKey] description] forKey:[ele description]];
}
}
}
else {
[data setObject:[inner description] forKey:[element description]];
}
}
self.weatherData = data;
NSLog([self.weatherData description]) **//there is data**
}
#end
However every time I call this from by city object I get nothing back at all.
#import <Foundation/Foundation.h>
#import "WeatherFetcher.h"
#interface City : NSObject {
}
#property (nonatomic, strong) NSString *cityName;
#property (nonatomic, strong) NSString *stateName;
#property (nonatomic, strong) UIImage *cityPicture;
#property (nonatomic, strong) NSString *weather;
#property (nonatomic, strong) NSMutableDictionary *weatherData;
-(NSString *)getWeather;
#end
UI calls getWeather by a button press to get the string value to be displayed on screen
#implementation City {
}
-(NSString *)getWeather {
//return self.weather;
NSString *info = #"";
WeatherFetcher *weatherFetcher = [[WeatherFetcher alloc] init];
[weatherFetcher fetchWeather:self.cityName];
self.weatherData = [weatherFetcher weatherData];
for (id element in self.weatherData) {
info = [info stringByAppendingString:[element description]];
info = [info stringByAppendingString:#"-->"];
info = [info stringByAppendingString:[self.weatherData valueForKey:[element description]]];
info = [info stringByAppendingString:#"\n"];
}
return info;
}
#end
What am I doing wrong here?
getWeather method in the city class gets called when a button is pressed and I'm trying to display this string in a text area. I don't have much experience with Objective C and this is my first app other than Hello World app.
Thank you!
Your WeatherFetcher is asynchronous (sendAsynchronousRequest:) - it sets a task to obtain the data and then returns (usually) before that data has been obtained. So when you try to access the weatherData immediately after the call to fetchWeather: it is not there yet.
You need to redesign your model to handle asynchronicity - getWeather cannot be synchronous. For example you could make fetchWeather: take a completion block to invoke when the data is available and have getWeather pass in a suitable block.
I am trying to bind my core data to a NSTableView. I am getting information from an API then wanting to add it to NSTableView. It looks like it is setup correctly because each time I have it call the API and get information back, a blank line is added to the NSTableView data.
Why is it adding a blank line instead of the data I have it binded too?
AppController.h
#property (nonatomic, strong) NSManagedObjectContext *managedObjectContext;
I then am using the new Xcode where it auto synth's.
Items.h
#class TimeLog;
#interface Items : NSManagedObject
#property (nonatomic, retain) NSNumber * itemId;
#property (nonatomic, retain) NSString * title;
#property (nonatomic, retain) NSString * itemType;
#property (nonatomic, retain) TimeLog *relationship;
#end
Items.m
#implementation Items
#dynamic itemId;
#dynamic title;
#dynamic itemType;
#dynamic relationship;
#end
ItemObject.h
#interface ItemObject : NSObject
#property (nonatomic, retain) NSString * itemId;
#property (nonatomic, retain) NSString * title;
#property (nonatomic, retain) NSString * itemType;
#end
ItemObject.m
#implementation ItemObject
#end
Method making API Call
This method makes the API call and adds it to a temp object. It then adds that temp object to core data.
+ (void)searchForItemByType:(NSString *)itemType andId:(NSString *)searchId
{
NSLog(#"Search Feature By ID: %#", searchId);
RKObjectMapping *itemMapping = [RKObjectMapping mappingForClass:[ItemObject class]];
[itemMapping addAttributeMappingsFromDictionary:#{
#"id": #"itemId",
#"name": #"title",
#"item_type": #"itemType"
}];
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:itemMapping pathPattern:nil keyPath:#"data" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
RKObjectMapping *errorMapping = [RKObjectMapping mappingForClass:[RKErrorMessage class]];
// The entire value at the source key path containing the errors maps to the message
[errorMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:#"errorMessage"]];
NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassClientError);
// Any response in the 4xx status code range with an "errors" key path uses this mapping
RKResponseDescriptor *errorDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:errorMapping pathPattern:nil keyPath:#"error_description" statusCodes:statusCodes];
RKObjectManager *manager = [RKObjectManager sharedManager];
NSLog(#"HTTP Client: %#", manager.HTTPClient);
[manager addResponseDescriptorsFromArray:#[ responseDescriptor, errorDescriptor ]];
// NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
#"false", #"with_lock"
, nil];
NSString *path = [NSString stringWithFormat:#"/api/v1/%#/%#", [itemType lowercaseString], searchId];
NSLog(#"Manager: %#", manager);
[manager getObjectsAtPath:path parameters:params success:^(RKObjectRequestOperation *operation, RKMappingResult *result) {
NSLog(#"Results: %#", [result firstObject]);
Items *insertItem = [NSEntityDescription insertNewObjectForEntityForName:#"Items" inManagedObjectContext:[[CoreDataHelper sharedInstance] managedObjectContext]];
insertItem = [result firstObject];
NSLog(#"Name: %#", [insertItem title]);
// Handled with articleDescriptor
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
// Transport error or server error handled by errorDescriptor
NSLog(#"Error: %#", [error localizedDescription]);
NSAlert *alert = [NSAlert alertWithMessageText:#"Error" defaultButton:#"OK" alternateButton:nil otherButton:nil informativeTextWithFormat:#"%#", [error localizedDescription]];
[alert runModal];
}];
}
Log from above code
2013-03-15 10:15:21.817 Project[59074:403] Results: <ItemObject: 0x1034ab360>
2013-03-15 10:15:21.818 Project[59074:403] ManagedObjectContext
2013-03-15 10:15:21.818 Project[59074:403] Name: Custom Mod is missing from Face Lift
IB
I think the problem may be in this code:
NSLog(#"Results: %#", [result firstObject]);
Items *insertItem = [NSEntityDescription insertNewObjectForEntityForName:#"Items" inManagedObjectContext:[[CoreDataHelper sharedInstance] managedObjectContext]];
insertItem = [result firstObject];
NSLog(#"Name: %#", [insertItem title]);
In your log it looks like [result firstObject] is part of the 'ItemObject' class not the 'Items' class. Even though they share the same structure, 'ItemObject' does not inherit from NSManagedObject, but is being assigned to one. The system doesn't know how to translate an 'ItemObject' object into an 'Items' object so it simply keeps all the values in insertItem blank, which translates into a blank line showing up in your table. Try this instead:
Items *insertItem = [NSEntityDescription insertNewObjectForEntityForName:#"Items" inManagedObjectContext:[[CoreDataHelper sharedInstance] managedObjectContext]];
ItemObject *tempObject = [result firstObject];
insertItem.itemID = tempObject.itemID;
insertItem.title = tempObject.title;
insertItem.itemType = tempObject.itemType;
I am blocking into something and I am sure it is too big.
I have a custom object that look like this
#interface DownloadObject : NSObject <NSCoding>{
NSNumber *key;
NSString *name;
NSNumber *progress;
NSNumber *progressBytes;
NSNumber *size;
NSString *path;
}
#property (copy) NSNumber *key;
#property (copy) NSString *name;
#property (copy) NSNumber *progress;
#property (copy) NSNumber *size;
#property (copy) NSString *path;
#property (copy) NSNumber *progressBytes;
-(id)initWithKey:(NSNumber *)k name:(NSString *)n progress:(NSNumber *)pro size:(NSNumber *)s path:(NSString *)p progressBytes:(NSNumber *)pb;
#end
And the implementation
#implementation DownloadObject
#synthesize size, progress, name, key, path, progressBytes;
-(id)initWithKey:(NSNumber *)k name:(NSString *)n progress:(NSNumber *)pro size:(NSNumber *)s path:(NSString *)p progressBytes:(NSNumber *)pb
{
self.key = k;
self.name = n;
self.progress = pro;
self.size = s;
self.path = p;
self.progressBytes = pb;
return self;
}
-(id) initWithCoder: (NSCoder*) coder {
if (self = [super init]) {
self.key = [[coder decodeObjectForKey:#"Key"] retain];
self.name = [[coder decodeObjectForKey:#"Name"] retain];
self.progress = [[coder decodeObjectForKey:#"Progress"] retain];
self.size = [[coder decodeObjectForKey:#"Size"] retain];
self.path = [[coder decodeObjectForKey:#"Path"] retain];
self.progressBytes = [[coder decodeObjectForKey:#"ProgressBytes"]retain];
}
return self;
}
-(void) encodeWithCoder: (NSCoder*) coder {
[coder encodeObject:self.key forKey:#"Key"];
[coder encodeObject:self.name forKey:#"Name"];
[coder encodeObject:self.progress forKey:#"Progress"];
[coder encodeObject:self.size forKey:#"Size"];
[coder encodeObject:self.path forKey:#"Path"];
[coder encodeObject:self.progressBytes forKey:#"ProgressBytes"];
}
-(void)dealloc
{
[key release];
[name release];
[size release];
[progress release];
[path release];
[progressBytes release];
[super dealloc];
}
#end
As you can see it implement NSCoding (I think so, NSObject does not conform to NSCoding). Now when I try to do something like that just to test
downloadArray = [[[NSMutableArray alloc]init]retain];
NSNumber *number = [NSNumber numberWithInt:10];
DownloadObject *object = [[DownloadObject alloc]initWithKey:number name:#"hey" progress:number size:number path:#"hey" progressBytes:number];
[downloadArray addObject:object];
[object release];
[downloadArray writeToFile:path atomically:YES];
downloadArray is a NSMutableArray. My plist read/write is fine, the path is located in the application support and when I log it show the plist path.
But it just does not write the array to the plist, any idea ?
Property list files can only store basic data types and cannot contain custom objects. You need to convert your object to an NSData object if you want it to be written to the plist. You can do this with NSKeyedArchiver, which will encode an object which conforms to the NSCoding protocol into an NSData object.
DownloadObject *object = [[DownloadObject alloc]initWithKey:number name:#"hey" progress:number size:number path:#"hey" progressBytes:number];
NSData* objData = [NSKeyedArchiver archivedDataWithRootObject:object];
[downloadArray addObject:objData];
[object release];
When you want to reconstruct your object from the NSData object, you use NSKeyedUnarchiver:
NSData* objData = [downloadArray objectAtIndex:0];
DownloadObject* object = [NSKeyedUnarchiver unarchiveObjectWithData:objData];
You also have several memory leaks in your code. In your -initWithCoder: method, you should not be using accessors to set the value of the ivars, you should just set the ivars directly, like so:
key = [[coder decodeObjectForKey:#"Key"] copy];
You are calling -retain and then using the accessor which is specified as copy, which will mean your object has a retain count of 2 and will not be released. In general you should avoid using accessors in init methods.
Also, in the code where you allocate your downloadArray object, you are calling -alloc and then -retain on the object, which will leave it with a retainCount of 2. You should re-read the Objective-C Memory Management Guidelines.
This works for me:
NSMutableData *data = [[NSMutableData alloc] init];
NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[archiver encodeObject:highScoreArray forKey:kHighScoreArrayKey];
[archiver finishEncoding];
[data writeToFile:[self dataFilePath] atomically:YES];
[data release];
[archiver release];
BOOL flag = false;
ObjectFileClass *obj = [yourMutableArray objectAtIndex:0];
//TO Write Data . . .
NSData* archiveData = [NSKeyedArchiver archivedDataWithRootObject:obj.title];
flag =[archiveData writeToFile:path options:NSDataWritingAtomic error:&error];
}
if (flag) {
NSLog(#"Written");
//To Read Data . . .
NSData *archiveData = [NSData dataWithContentsOfFile:path];
id yourClassInstance = [NSKeyedUnarchiver unarchiveObjectWithData:archiveData]; // choose the type of your class instance . . .
NSLog(#"%#",yourClassInstance);
}else{
NSLog(#"Not Written");
}