I got this NSMutableDictionary that contains a object and a key.
The key is: TemplateID and the Object is a number.
My problem is i can't get the Object out, without the key.
Can anyone help?
// Defining stuff...
templateData = [[NSMutableArray alloc] initWithCapacity:0];
[templateData addObjectsFromArray:[[WebXML sharedInstance] extractAddTemplate]];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] initWithObjectsAndKeys:templateData, #"TemplateID", nil];
// First method...
NSArray *keys = [dict allKeys];
id aKey = [keys objectAtIndex:0];
id anObject = [dict objectForKey:aKey];
NSLog(#"anObject: %#", anObject);
// In NSLog it says: anObject: TemplateID = <theObject>;
// I just want anObject: <theObject>
// Second method...
for (id key in dict) {
id anObject = [dict objectForKey:key];
NSLog(#"anObject: %#", anObject);
// In NSLog it says: anObject: TemplateID = <theObject>;
// I just want anObject: <theObject>
}
// Third method...
NSArray * myArray = [NSArray arrayWithObject:#"TemplateID"];
NSMutableDictionary *anotherDict = [[NSMutableDictionary alloc] initWithObjects:templateData forKeys:myArray];
NSLog(#"anotherDict: %#", anotherDict);
// In NSLog it says: anotherDict: TemplateID = <theObject>;
// I just want anotherDict: <theObject>
// Mikkel
Related
I have a search bar for my table view and until now I used a predicate to check if the data array contains the search bar value. But now there are objects in my data array and now I don't know how to use the predicate. Here is my code:
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"SELF contains [cd] %#", self.controller.searchBar.text];
NSMutableArray *temp = [[NSMutableArray alloc] init];
for (int i = 0; i < [self.data count]; i++) {
Student *student = [[Student alloc] initWithIdentifier:[[self.data objectAtIndex:self.tableView.indexPathForSelectedRow.row] objectForKey:#"id"] name:[[self.data objectAtIndex:self.tableView.indexPathForSelectedRow.row] objectForKey:#"name"] is_public:[[self.data objectAtIndex:self.tableView.indexPathForSelectedRow.row] objectForKey:#"is_public"] password:[[self.data objectAtIndex:self.tableView.indexPathForSelectedRow.row] objectForKey:#"passwort"]];
[temp addObject:student];
}
self.results = [temp filteredArrayUsingPredicate:predicate];
Now it compares the search bar value with the object. But it should compare the search bar value with object.name. How can I do this?
EDIT:
The Student code:
#implementation Student
- (id)initWithIdentifier:(NSString *)identifier name:(NSString *)name is_public:(NSString *)is_public password:(NSString *)password {
self= [super init];
if( self ) {
self.identifier = identifier;
self.name = name;
self.is_public = is_public;
self.password = password;
}
return self;
}
- (NSDictionary*)writableRepresentation {
NSMutableDictionary *writableRepresentation= [NSMutableDictionary dictionaryWithCapacity:4];
[writableRepresentation setValue:self.identifier forKey:#"Identifier"];
[writableRepresentation setValue:self.name forKey:#"Name"];
[writableRepresentation setValue:self.is_public forKey:#"is_public"];
[writableRepresentation setValue:self.password forKey:#"password"];
return writableRepresentation;
}
+ (Student*)studentFromDictionary:(NSDictionary*)dictionaryRepresentation {
return [[Tipprunde alloc] initWithIdentifier:[dictionaryRepresentation valueForKey:#"Identifier"] name:[dictionaryRepresentation valueForKey:#"Name"] is_public:[dictionaryRepresentation valueForKey:#"is_public"] password:[dictionaryRepresentation valueForKey:#"password"]];
}
#end
It don't seem to work with SELF.name. I get the following error:
-[Student objectForKey:]: unrecognized selector sent to instance...
please Help me. I stuck here when deleting an object from array.
for (id obj in self.arrSavedImage)
{
Class cls = [obj class];
id newObj = [[cls alloc] init];
//UIImage *img = nil;
if([newObj isKindOfClass:[UIImage class]]){
NSLog(#"class type %#", [newObj class]);
}
else{
[self.arrSavedImage removeObject:obj];
}
}
Thank You.
You shouldn't remove objects from an array you are enumerating over. Better is to keep a list of the objects you want to delete, and then delete them when you've finished enumerating the original array:
NSMutableArray *toDelete = [NSMutableArray new];
for (id obj in self.arrSavedImage)
{
Class cls = [obj class];
id newObj = [[cls alloc] init];
if([newObj isKindOfClass:[UIImage class]]){
NSLog(#"class type %#", [newObj class]);
}
else{
[toDelete addObject:obj];
}
}
for (id obj in toDelete)
[self.arrSavedImage removeObject:obj];
NSMutableArray *itemsToDelete = [[NSMutableArray alloc] init];
for (id obj in self.arrSavedImage)
{
Class cls = [obj class];
id newObj = [[cls alloc] init];
//UIImage *img = nil;
if([newObj isKindOfClass:[UIImage class]]){
NSLog(#"class type %#", [newObj class]);
}
else{
[itemsToDelete addObject:obj];
}
}
[self.arrSavedImage removeObjectsInArray:itemsToDelete];
You can not remove the object in array while in loop.
You should create a new array with existing array and remove objects from it. Then replace the old array with editedArray.
NSMutableArray * editedArray = [[NSMutableArray alloc] initWithArray:self.arrSavedImage];
for (id obj in self.arrSavedImage)
{
Class cls = [obj class];
id newObj = [[cls alloc] init];
//UIImage *img = nil;
if([newObj isKindOfClass:[UIImage class]]){
NSLog(#"class type %#", [newObj class]);
}
else{
[editedArray removeObject:obj];
}
}
[self.arrSavedImage setArray:editedArray];
editedArray = nil;
If i enumerate an array i get
<myArray: 0x71b26b0>
<myArray: 0x71b2830>
<myArray: 0x71b2900>
I could take it that myData is behind the pointers listed, but if I wanted to explicitly see (log) the contents at each address, how to do that?
I have tried the &myData to no avail
--
for the benefit of uchuugaka:
-(void)loadObservedItems{
NSString *path = [self observationFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
NSData *data = [[NSData alloc] initWithContentsOfFile:path];
NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
myArray = [unarchiver decodeObjectForKey:#"ObserveKey"];
[unarchiver finishDecoding];
} else {
myArray = [[NSMutableArray alloc] initWithCapacity:10];
}
NSLog(#" %#",myArray);
}
Add to MyClass.m:
-(NSString*)description {
NSMutableDictionary* descDict = [NSMutableDictionary dictionary];
[descDict addObject:someField forKey:#"someField"]
[descDict addObject:anotherField forKey:#"anotherField"];
[descDict addObject:yetAnotherField forKey:#"yetAnotherField"];
return [descDict description];
}
Then just use NSLog(#"myObject is %#", myObject);. Just like the big guys.
Slightly more sophisticated is to (within the method) pre-pend your class name and the object address to the result string, but that's usually unnecessary for simple debugging.
But I think you can do that like this:
return [NSString stringWithFormat:#"%# : %#", [super description], [descDict description]];
I have a method which returns me a nsdictionary with certain keys and values. i need to change the key names from the dictionary to a new key name but the values need to be same for that key,but i am stuck here.need help
This method will only work with a mutable dictionary. It doesn't check what should be done if the new key already exists.
You can get a mutable dictionary of a immutable by calling mutableCopy on it.
- (void)exchangeKey:(NSString *)aKey withKey:(NSString *)aNewKey inMutableDictionary:(NSMutableDictionary *)aDict
{
if (![aKey isEqualToString:aNewKey]) {
id objectToPreserve = [aDict objectForKey:aKey];
[aDict setObject:objectToPreserve forKey:aNewKey];
[aDict removeObjectForKey:aKey];
}
}
You can't change anything in an NSDictionary, since it is read only.
How about loop through the dictionary and create a new NSMutableDictionary with the new key names ?
Could you not add a new key-value pair using the old value, and then remove the old key-value pair?
This would only work on an NSMutableDictionary. NSDictionarys are not designed to be changed once they have been created.
To change specific key to new key, I have written a recursive method for Category Class.
- (NSMutableDictionary*)replaceKeyName:(NSString *)old_key with:(NSString )new_key {
NSMutableDictionary dict = [NSMutableDictionary dictionaryWithDictionary: self];
NSMutableArray *keys = [[dict allKeys] mutableCopy];
for (NSString key in keys) {
if ([key isEqualToString:old_key]) {
id val = [self objectForKey:key];
[dict removeObjectForKey:key];
[dict setValue:val forKey:new_key];
return dict;
} else {
const id object = [dict objectForKey: key];
if ([object isKindOfClass:[NSDictionary class]]) {
[dict setObject:[dict replaceKeyName:old_key with:new_key] forKey:key];
} else if ([object isKindOfClass:[NSArray class]]){
if (object && [(NSArray)object count] > 0) {
NSMutableArray *arr_temp = [[NSMutableArray alloc] init];
for (NSDictionary *temp_dict in object) {
NSDictionary *temp = [temp_dict replaceKeyName:old_key with:new_key];
[arr_temp addObject:temp];
}
[dict setValue:arr_temp forKey:key];
}
}
}
}
return dict;
}
I am relatively new to Objective-C and now I have a problem in my iPhone app that I don't fully understand.
I try to use a NSMutableDictionary, this does not seem to work as i expect for some reason. When I run the debugger and do po numberToCallerMap to see the dictionary, I get an exception. I have read the documentation for NSMutableDictionary on how to initialize it, but I can not see what I am doing wrong. Help and advice are appreciated. The variable causing me problem is numberToCallerMap, here is the relevant function:
- (void)setData:(NSString*)value{
[list release];
list = [[NSMutableArray alloc] init];
SBJSON *json = [[[SBJSON alloc] init] autorelease];
NSMutableDictionary* numberToCallerMap;
CallerInfo* caller;
NSDictionary* callerInfo;
#try {
NSArray *array = (NSArray*)[json objectWithString:value];
// reading all the items in the array one by one
numberToCallerMap = [NSMutableDictionary dictionary];
for (id *item in array) {
// if the item is NSDictionary (in this case ... different json file will probably have a different class)
NSDictionary *dict2 = (NSDictionary *) item;
CallInfo *data = [CallInfo alloc];
[data initFromDictionary:dict2];
callerInfo = (NSDictionary*)[dict2 valueForKey:#"caller"] ;
//Here, we want the phonenumber to be part of the CallerInfo object instead.
// It is sent from the server as part of the Call-object
NSString* number = (NSString*)[dict2 valueForKey:#"phoneNumber"];
[callerInfo setValue:number forKey:#"phoneNumber"];
caller = (CallerInfo*)[numberToCallerMap valueForKey:number];
if(caller == nil || [caller isKindOfClass:[NSNull class]]){
caller = [CallerInfo alloc];
[caller initFromDictionary:callerInfo];
[numberToCallerMap setValue:caller forKey:number];
[list insertObject:caller atIndex:0];
}
[caller addRecentCall:data];
}
}
#catch (NSException * e) {
[list release];
list = [[NSMutableArray alloc] init];
}
#finally {
[numberToCallerMap release];
}
}
This is probably not the only problem, but you are not alloc-ing your numberToCallerMap dictionary, you are getting it from a convenience class method -- [NSMutableDictionary dictionary] -- that returns it autoreleased. So you should not call release on it yourself.