I have a for loop that goes through a series of dictionaries in an array.
How can I consolidate all the dictionaries entries as it goes through the for loop into one NSMutableDictionary?
I tried addEntriesFromDictionary, but its not working. Thanks for your help.
for (int i=0; i<sections.count; i++){
formElements = [[sections objectAtIndex:i]objectForKey:#"Dictionary"];
}
NSMutableDictionary * mutableDict = [NSMutableDictionary dictionary];
for (NSDictionary * formElements in sections)
{
[mutableDict addEntriesFromDictionary:formElements];
}
This should work if It's correct that they don't share any keys.
you can add dictionary object like below.
NSMutableDictionary *mDict=[NSMutableDictionary dictionary];
[mDict addEntriesFromDictionary:DictObj];
NSMutableDictionary *mDict=[[NSMutableDictionary alloc]init];
NSMutableDictionary *mDict2=[[NSMutableDictionary alloc]init];
//later suppose you have 5 object in mDict and 2 object in mDict2. combine in this Way.
NSMutableArray *keys=[[NSMutableArray alloc]init];
NSMutableArray *obj=[[NSMutableArray alloc]init];
keys=[[mDict allKeys] mutableCopy];
obj=[[mDict allValues] mutableCopy];
[keys addObjectsFromArray:[mDict2 allKeys]];
[obj addObjectsFromArray:[mDict2 allValues]];
NSMutableDictionary *dict=[[NSMutableDictionary alloc]initWithObjects:obj forKeys:keys];
You can enumerate your dictionaries with -objectEnumerator or other methodfs of NSDictionary.
So inside your loop you enumerate your dictionary and add all objects an keys into one big dictionary.
Related
My brain is fried! I can't think.
i am new to iphone programming
am doing json parsing ....in that am storeing data from json to nsdictionary but .......
I want to add all nsdictionary float values from the dictionary to the array. This is what I am doing right now.As code below:
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[connection release];
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
self.responseData = nil;
dict = [responseString JSONValue];
NSMutableArray *array = [NSMutableArray array];
for (NSString *key in [dict allKeys])
{
array = [dict objectForKey:key];
// array return float values but
[array addObject:array ]; // geting carsh dude to array return float values like 120.01
}
Please guide me i am not getting a part where i am doing a mistake.
Thanks in advance.
Your app is crashing because you are adding data to NSArray , this is static array, you can not add value at run time, so just Make NSMutableArray and add your data in NSMutableArray.
Your code is broken in a couple of ways.
This line assigns the array pointer to the object in the dictionary:
array = [dict objectForKey:key];
Then you are trying to add the array to itself, which does not make sense. But worse, since array does no longer point to your NSMutableArray you cannot even call that method.
[array addObject:array ];
You probably wanted to do something like this:
for (NSString *key in [dict allKeys])
{
id value = [dict objectForKey:key];
[array addObject:value];
}
i have searched a lot but not able two sort my array a/c to requirement
i used this code:
[array1 sortArrayUsingSelector:#selector(caseInsensitiveCompare:) withPairedMutableArrays:arrForName, arrForAddress, nil];
thanks
On the NSArray Class Reference there isn't a - sortArrayUsingSelector:withPairedMutableArrays: method. Neither on the NSMutableArray Class Reference. If you want, you can use other methods like the NSMutableArray sortUsingSelector: method.
Put the two arrays into a dictionary as keys and values
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:arrForAddress forKeys:arrForName];
// Sort the first array
NSArray *sortedFirstArray = [[dictionary allKeys] sortedArrayUsingSelector:#selector(compare:)];
// Sort the second array based on the sorted first array
arrForAddress=[[NSMutableArray alloc]init ];
NSArray *sortedSecondArray = [dictionary objectsForKeys:sortedFirstArray notFoundMarker:[NSNull null]];
// arrForAddress = [dictionary objectsForKeys:sortedFirstArray notFoundMarker:[NSNull null]];
[arrForAddress addObjectsFromArray:sortedSecondArray];
NSLog(#"arrangesort......%#",arrForAddress);
I have an NSMutableArray that looks like this
{
"#active" = false;
"#name" = NAME1;
},
{
"#active" = false;
"#name" = NAME2;
}
Is there a way to convert this to an NSDictionary and then use objectForKey to get an array of the name objects? How else can I get these objects?
There is a even shorter form then this proposed by Hubert
NSArray *allNames = [array valueForKey:#"name"];
valueForKey: on NSArray returns a new array by sending valueForKey:givenKey to all it elements.
From the docs:
valueForKey:
Returns an array containing the results of invoking
valueForKey: using key on each of the array's objects.
- (id)valueForKey:(NSString *)key
Parameters
key The key to retrieve.
Return Value
The value of the retrieved key.
Discussion
The returned array contains NSNull elements for each object that returns nil.
Example:
NSArray *array = #[#{ #"active": #NO,#"name": #"Alice"},
#{ #"active": #NO,#"name": #"Bob"}];
NSLog(#"%#\n%#", array, [array valueForKey:#"name"]);
result:
(
{
active = 0;
name = Alice;
},
{
active = 0;
name = Bob;
}
)
(
Alice,
Bob
)
If you want to convert NSMutableArray to corresponding NSDictionary, just simply use mutableCopy
NSMutableArray *phone_list; //your Array
NSDictionary *dictionary = [[NSDictionary alloc] init];
dictionary = [phone_list mutableCopy];
This is an Array of Dictionary objects, so to get the values you would:
[[myArray objectAtIndex:0]valueForKey:#"name"]; //Replace index with the index you want and/or the key.
This is example one of the exmple get the emplyee list NSMutableArray and create NSMutableDictionary.......
NSMutableArray *emloyees = [[NSMutableArray alloc]initWithObjects:#"saman",#"Ruchira",#"Rukshan",#"ishan",#"Harsha",#"Ghihan",#"Lakmali",#"Dasuni", nil];
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for (NSString *word in emloyees) {
NSString *firstLetter = [[word substringToIndex:1] uppercaseString];
letterList = [dict objectForKey:firstLetter];
if (!letterList) {
letterList = [NSMutableArray array];
[dict setObject:letterList forKey:firstLetter];
}
[letterList addObject:word];
} NSLog(#"dic %#",dict);
yes you can
see this example:
NSDictionary *responseDictionary = [[request responseString] JSONValue];
NSMutableArray *dict = [responseDictionary objectForKey:#"data"];
NSDictionary *entry = [dict objectAtIndex:0];
NSString *num = [entry objectForKey:#"num"];
NSString *name = [entry objectForKey:#"name"];
NSString *score = [entry objectForKey:#"score"];
im sorry if i can't elaborate much because i am also working on something
but i hope that can help you. :)
No, guys.... the problem is that you are stepping on the KeyValue Mechanism in cocoa.
KeyValueCoding specifies that the #count symbol can be used in a keyPath....
myArray.#count
SOOOOOO.... just switch to the ObjectForKey and your ok!
NSMutableDictionary *myDictionary = [NSMutableDictionary dictionaryWithObjectsAndKeys:#"theValue", #"#name", nil];
id kvoReturnedObject = [myDictionary valueForKey:#"#name"]; //WON'T WORK, the # symbol is special in the valueForKey
id dictionaryReturnedObject = [myDictionary objectForKey:#"#name"];
NSLog(#"object = %#", dictionaryReturnedObject);
for(Attribute* attribute in appDelegate.attributeArray) {
attribute = [appDelegate.attributeArray objectAtIndex:z];
attri = attribute.zName;
int y = 0;
for(Row* r in appDelegate.elementsArray) {
r = [appDelegate.elementsArray objectAtIndex:y];
NSString *ele = r.language;
if([attri isEqualToString:ele]) {
NSLog(#"=================+++++++++++++++++%# %#",attri, r.user);
[aaa insertObject:r atIndex:y]; //here i am adding the value to array
[dict setObject:aaa forKey:attri]; //here i am adding the array to dictionary
}
y++;
}
z++;
NSLog(#"============$$$$$$$$$$$$$$$$$$$$$$$++++++++++ %#",dict);
}
key in one array and the value in the another array and the value array is in object format.
I need to store the multi object for the single key. The attributeArray has the key value and the elementsArray has the object. For example the attributeArray might have the values
" English, French, German..."
and the elementsArray might have the object value
"<Row: 0x4b29d40>, <Row: 0x4b497a0>, <Row: 0x4e38940>, <Row: 0x4b2a070>, <Row: 0x4b29ab0>, <Row: 0x4b178a0> "
In the first value I need to store the two object and for second key I need to store 3 objects and for the third key in need to store last two objects in the dictionary.
For super-simplification you can use the following code:
NSArray *keys = ...;
NSArray *values = ...;
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjects: values forKeys: keys];
Hope, this helps.
UPDATE:
to store multiple values for single key in the dictionary, just use NSArray / NSMutableArray as your object:
NSArray *keys = ...;
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for( id theKey in keys)
{
NSMutableArray *item = [NSMutableArray array];
[item addObject: ...];
[item addObject: ...];
...
[dict setObject: item forKey: theKey];
}
If you don't know all the values for the key from the beginning and need to add them one by one, you can use the following approach:
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for( /*some cycling condition here */)
{
id keyToUse = ...;
id valueToAdd = ...;
id foundArray = [dict objectForKey: keyToUse];
if ( nil == foundArray )
{
foundArray = [NSMutableArray array];
[dict setObject: foundArray forKey: keyToUse];
}
[foundArray addObject: valueToAdd];
}
To me it looks you are settings an array (aaa) with string (attri) as a key.
To set an array as a key for another array as an object. You can do this with the following appraoch.
NSMutableDictionary *myDictionary = [NSMutableDictionary dictionaryWithCapacity:1];
NSArray *valueArray = [NSArray arrayWithObjects:#"v1", #"v2", nil];
NSArray *keyArray = [NSArray arrayWithObjects:#"k1",#"k2", nil];
[myDictionary setObject:valueArray forKey:keyArray];
NSLog(#"myDictionary: %#", myDictionary);
But you should review your code and provide a more brief explanation that what do you want to achieve and how are you taking an approach for this.
regards,
Arslan
I have an nsmutablearray(xmlParseArray) having values firstname and id, I want to copy only firstname into another nsmutablearray(copyArray).
How can I do this?
Assumption: your xmlParseArray contains number of objects all of which have a firstname property and and an id property
NSMutableArray* nameArray = [[xmlParseArray valueForKey: #"firstname"] mutableCopy];
// nameArray is an array you own.
-valueForKey: when sent to an array causes the message -valueForKey: to be sent to each of its elements and a new array to be constructed from the return values. The -mutableCopy ensures that the result is then turned into a mutable array as per your question.
I'm guessing you mean that the first array, xmlParseArray, contains a list of NSDictionary objects which each have objects attached to the keys "firstname" and "id". One way to accomplish that would be like this:
NSMutableArray *copyArray = [[NSMutableArray alloc] initWithCapacity:[xmlParseArray count]];
for(NSDictionary *dict in xmlParseArray)
if([dict objectForKey:#"firstname"])
[copyArray addObject:[dict objectForKey:#"firstname"]];
// ...do whatever with copyArray...
[copyArray release];
NSMutableArray *arr = [NSMutableArray arrayWithObject:[copyArray objectAtIndex:0]];
or
[arr addObject:[copyArray objectAtIndex:0]];
[arr addObject:[copyArray objectAtIndex:1]];
NSMutableArray *newArray = [oldArray mutableCopy];
or
NSMutableArray *newArray = [NSMutableArray arrayWithArray:oldArray];
be aware that the objects in the array aren't copied, just the array itself (references to objects are maintained).