May I know is that possible for NSDictionary or NSMutableDictionary to add in multiple same keys for different object? It is because of the API that written by the developers are accepting an array.
e.g:
NSArray *ids = #[#"xxx", #"yyy", #"zzz"];
NSMutableDictionary *args = [[NSMutableDictionary alloc] initWithObjectsAndKeys:#"someobject", #"somekey"];
I've defined an args and set of ids that picked by user and now I will loop the array.
for( NSString *getId in ids ){
[args setObject:getId forKey:#"ids[]"];
}
So ended up, the results come out are
"somekey" = "someobject", "ids[]" = "zzz";
Is that possible for me to get result as follows?
"somekey" = "someobject", "ids[]" = "xxx", "ids[]" = "yyy", "ids[]" = "zzz";
Please advise, thanks!
Yes it is possible
NSArray *arr = [[NSArray alloc]initWithObjects:#"xxx",#"yyy",#"zzz", nil];
NSMutableDictionary *dic = [[NSMutableDictionary alloc] initWithObjectsAndKeys:#"Someobject", #"Somekey", nil];
for (int i = 0; i<[arr count]; i++) {
[dic setValue:[arr objectAtIndex:i] forKey:[NSString stringWithFormat:#"id[%d]", i]];
}
NSLog(#"dic %#",dic);
Use this code sure it would help you.
No, key is unique. But you can put an NSMutableArray in your NSDictionary, and store you values like key => array(x,y,...)
Instead of that you can create Dictionary like this.
YourDictionary = {
"somekey" = "someobject",
"ids[]" = (
"xxx",
"yyy",
"zzz"
)
}
Treat ids[] as an array
Hope this will solve your problem
No that's not the way a dictionary should be used. As peko said, just put your array in the dict:
[args setObject:ids forKey:#"ids"];
Related
In my project I am getting response from the server in the form
response:
<JKArray 0x7fa2e09036b0>(
{
id = 23;
name = "Name1";
},
{
id = 24;
name = "Name2";
}
)
From this response array i am retrieving the objects at different indexes and then adding them in a mutableArray and then into a contactsDictionary.
self.contactsDictionary = [[NSMutableDictionary alloc] init];
for(int i=0 ; i < [response count] ; i++)
{
NSMutableArray *mutableArray=[[NSMutableArray alloc] init];
[mutableArray addObject:[response objectAtIndex:i]];
[self.contactsDictionary setObject:mutableArray forKey:[NSString stringWithFormat:#"%i",i]];
}
I want to retrieve data for Key #"name" from the contactsDictionary at some other location in the project. So how to do it.
Thanks in advance....
this is the wrong way like you are setting your contactsDictionary.
replace below line
[self.contactsDictionary setObject:mutableArray forKey:[NSString stringWithFormat:#"%i",i]];
with
[self.contactsDictionary setObject:[mutableArray objectAtIndex :i] forKey:[NSString stringWithFormat:#"%i",i]];
becuase everytime your array have new objects so your contacts dictionary's first value have one object then second value have two object. so you shouldn't do that.
now, if you want to retrieve name then call like
NSString *name = [[self.contactsDictionary objectForKey : #"1"]valueForKey : #"name"];
avoid syntax mistake if any because have typed ans here.
Update as per comment:
just take one mutablearray for exa,
NSMutableArray *arr = [[NSMutableArray alloc]init];
[arr addObject : name]; //add name string like this
hope this will help :)
Aloha from your respond I can give you answer Belo like that according to you response.
for(int i=0;i<[arrRes count];i++);
{
NSString *strId = [NSString stringWithFormat:#"%#",[[arrRes obectAtIndex:i]objectForKey:#"id"]];
NSString *StrName = [NSString stringWithFormat:#"%#",[[arrRes objectAtIndex:i]objectForKey:#"name"]];
NSLog(#"The ID is -%#",strId);
NSLog(#"The NAME is - %#",strName);
}
I have a json from a service and I need to change the values of one obeject.
{
question = (
{
answer = (
{
Id = 1;
value = 1;
},
{
Id = 2;
value = 0;
}
);
},
.....
I use that code to directly access to the second "value" element and set it to "true"
NSMutableDictionary * dict = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];
NSMutableDictionary *preguntasDict = [[NSMutableDictionary alloc] init];
preguntasDict =[[[dict valueForKey:#"question"]mutableCopy];
NSMutableDictionary *answer = [[NSMutableDictionary alloc] init];
respuestasDict =[[[[preguntasDict valueForKey:#"answer"]objectAtIndex:0]objectAtIndex:1] mutableCopy];
[respuestasDict setObject:[NSNumber numberWithBool:true] forKey:#"value"];
It works: "respuestasDict" changes but the whoole "dict" not.
My question is: how could rebuild the entire dictionary? or it is possible to access directly to the nested object and change it?
Note that perguntasDict and respuestasDict are mutable copies of your dictionaries, so basically you are editing copies of your dict. You need to access dict directly, like this:
NSArray *answers = dict[#"question"][#"answer"];
[answers firstObject][#"value"] = #(YES);
PS: Doing dict[#"question"] is the same thing as [dict objectForKey:#"question"]. Also, #(YES) is the same thing as [NSNumber numberWithBool:true]
I'm trying to use NSData to pull information out of a text file, and then load it into a dictionary.
First I create a string of the text file, and load each record into an array.
Then I break apart the each record into individual data elements.
The problem I'm having is that when the dictionary is fully populated, I then use addObject to load it into the array, which it does do successfully. The problem is that when the next loop creates a new dictionary, the same dictionary gets loaded into the array, and I end up an array of all the same dictionaries, instead of multiple different dictionary objects.
I'm guessing there is some simple mistake I'm making that is causing this error. Any help would be appreciated.
NSString *clientListFile = [NSURL URLWithString: #"/textfile"];
NSData *clientListDataFile = [NSData dataWithContentsOfFile:clientListFile];
NSString *clientListString = [[NSString alloc]initWithBytes:[clientListDataFile bytes] length:[clientListDataFile length] encoding:NSUTF8StringEncoding];
NSString *returnDelimiter = #"\n";
NSString *commaDelimiter = #",";
NSString *exclamationDelimiter = #"!";
NSArray *keysAndObjects = [[NSArray alloc]init];
NSMutableDictionary *clientList = [[NSMutableDictionary alloc]init];
NSMutableArray *clientListOfDictionaries = [[NSMutableArray alloc]init];
NSArray *sentenceArray = [clientListString componentsSeparatedByString:returnDelimiter];
for (int i = 0; i < [sentenceArray count]; i=i+1) {
[clientList removeAllObjects]; //to start with a fresh dictionary for the next iteration
NSString *recordSentence = [sentenceArray objectAtIndex:i];
NSArray *attributes = [recordSentence componentsSeparatedByString:commaDelimiter];
for (int j = 0; j < [attributes count]; j = j+1) {
NSString *pairsOfItems = [attributes objectAtIndex:j];
//a small arry, of only two objects, the first is the key, the second is the object
keysAndObjects = [pairsOfItems componentsSeparatedByString:exclamationDelimiter];
[clientList setObject:[keysAndObjects lastObject] forKey:[keysAndObjects firstObject]];
}
[clientListOfDictionaries addObject:clientList];
}
When I used NSLog to see what's in the dictionary, I mulitple objects of the same dictionary repeated, even though up earlier in the iteration, I can see that the code is creating separate and unique dictionaries.
Instead of this line
[clientListOfDictionaries addObject:clientList];
you can have
[clientListOfDictionaries addObject:[[NSArray alloc] initWithArray:clientList];
That way you will be adding new arrays to clientListOfDictionaries instead of the same one.
Move this line:
NSMutableDictionary *clientList = [[NSMutableDictionary alloc]init];
to just after the first for loop line and then delete the line:
[clientList removeAllObjects];
It's important to create a new dictionary for each iteration.
You should also delete the following line:
NSArray *keysAndObjects = [[NSArray alloc]init];
and change:
keysAndObjects = [pairsOfItems componentsSeparatedByString:exclamationDelimiter];
to:
NSArray *keysAndObjects = [pairsOfItems componentsSeparatedByString:exclamationDelimiter];
You are allocated and initialising your clientList dictionary outside of the for loop, so you only have one dictionary, which you are storing in your array multiple times. Adding the dictionary to the array does not copy it, it merely adds a pointer to the object.
you need to move
NSMutableDictionary *clientList = [[NSMutableDictionary alloc]init];
inside your first for loop in place of
[clientList removeAllObjects];
Also, componentsSeparatedByString: returns an NSArray, so you don't need to allocate and initialise one. You can simply define the variable -
NSArray *keysAndObjects;
Because you're using the same clientList variable for each iteration of the loop. You need to create a whole new dictionary object each time.
Try this modified code:
NSData *clientListDataFile = [NSData dataWithContentsOfFile:clientListFile];
NSString *clientListString = [[NSString alloc]initWithBytes:[clientListDataFile bytes] length:[clientListDataFile length] encoding:NSUTF8StringEncoding];
NSString *returnDelimiter = #"\n";
NSString *commaDelimiter = #",";
NSString *exclamationDelimiter = #"!";
NSArray *keysAndObjects = nil;
NSMutableArray *clientListOfDictionaries = [[NSMutableArray alloc] init];
NSArray *sentenceArray = [clientListString componentsSeparatedByString:returnDelimiter];
for (NSUInteger i = 0; i < [sentenceArray count]; ++i) {
NSMutableDictionary *clientList = [[NSMutableDictionary alloc] init]; //to start with a fresh dictionary for the next iteration
NSString *recordSentence = [sentenceArray objectAtIndex:i];
NSArray *attributes = [recordSentence componentsSeparatedByString:commaDelimiter];
for (NSUInteger j = 0; j < [attributes count]; ++j) {
NSString *pairsOfItems = [attributes objectAtIndex:j];
//a small arry, of only two objects, the first is the key, the second is the object
keysAndObjects = [pairsOfItems componentsSeparatedByString:exclamationDelimiter];
[clientList setObject:[keysAndObjects lastObject] forKey:[keysAndObjects firstObject]];
}
[clientListOfDictionaries addObject:clientList];
}
An alternate option, though likely less efficient, is to to change the line:
[clientListOfDictionaries addObject:clientList];
to
[clientListOfDictionaries addObject:[clientList copy]];
That lets you keep using the same clientList variable, since you're adding a copy of it to the clientListOfDictionaries array. I just point that out because it might help you understand what's going on.
Also, note that I changed this line for you:
NSArray *keysAndObjects = [[NSArray alloc]init];
to
NSArray *keysAndObjects = nil;
Because it's just a pointer that is set by your call to componentsSeparatedByString, you don't need to allocate an array for it. That array will just vanish in your first iteration of the loop.
Should be added the new dictionary to array. Otherwise it will not add to an array. Every object in array have same dictionary mapping. So it will give you the same dictionary value. Create new dictionary for every object and add to array.
for (int i = 0; i < [sentenceArray count]; i=i+1) {
NSMutableDictionary *clientList = [[NSMutableDictionary alloc]init];
NSString *recordSentence = [sentenceArray objectAtIndex:i];
NSArray *attributes = [recordSentence componentsSeparatedByString:commaDelimiter];
for (int j = 0; j < [attributes count]; j = j+1) {
NSString *pairsOfItems = [attributes objectAtIndex:j];
//a small arry, of only two objects, the first is the key, the second is the object
NSArray *keysAndObjects = [pairsOfItems componentsSeparatedByString:exclamationDelimiter];
[clientList setObject:[keysAndObjects lastObject] forKey:[keysAndObjects firstObject]];
}
[clientListOfDictionaries addObject:clientList];
}
I have array of dictionary that needs to be grouped according to PO which is part of the element and also get the total of quantityOrdered according to the same PO.
The PO is dynamic it means it can be any value that needs to be filtered and compute the quantityOrderd accordingly.
Please help.
{
PO = PO2;
QuantityReceived = 1;
},
{
PO = PO1;
QuantityReceived = 3;
},
{
PO = PO1;
QuantityReceived = 3;
},
{
PO = PO3;
QuantityReceived = 2;
},
{
PO = PO2;
QuantityReceived = 2;
},
{
PO = PO3;
QuantityReceived = 4;
},
{
PO = PO1;
QuantityReceived = 1;
},
Apology for the confusion or incomplete question but i need to create a new array of dictionary with similar like this :
{
PO = PO1;
TotalQuanityReceived=7;
LineItems=3;
},
{
PO = PO2;
TotalQuanityReceived=3;
LineItems=2;
},
{
PO = PO3;
TotalQuanityReceived=6;
LineItems=2;
},
i updated my example and make it easy to read.
- (NSArray *)whatever:(NSArray *)dictionaries
{
NSMutableArray *results = [[NSMutableArray alloc] init];
NSMutableDictionary *resultsByPO = [[NSMutableDictionary alloc] init];
for (NSDictionary *dictionary in dictionaries) {
id po = [dictionary objectForKey:#"PO"];
NSMutableDictionary *result = [resultsByPO objectForKey:po];
if (result == nil) {
result = [[NSMutableDictionary alloc] init];
[resultsByPO setObject:result forKey:po];
[results addObject:result];
[result setObject:po forKey:#"PO"];
}
double total = [[result objectForKey:#"TotalQuantityReceived"] doubleValue];
total += [[dictionary objectForKey:#"QuantityOrdered"] doubleValue];
int count = 1 + [[result objectForKey:#"Count"] intValue];
[result setObject:#(total) forKey:#"TotalQuantityReceived"];
[result setObject:#(count) forKey:#"Count"];
}
return results;
}
More pain will come with PO values not conforming to NSCopying.
You can do it the clever way with KVC or the stupid easy way. Let's do it the stupid easy way!
Make an empty NSMutableDictionary. Let's call it dict.
Cycle through your array of dictionaries. For each dictionary:
Fetch its PO. Call that value thisPO.
Fetch dict[thisPO]. Was it nil?
a. Yes. Okay, so this particular PO has not yet been encountered. Set dict[thisPO] to this dictionary's quantity received (as an NSNumber).
b. No. Turn that value into an integer, add this dictionary's quantity received, and set the total back into dict[thisPO] (as an NSNumber).
Done! The result is not quite what you asked for; the result looks like this:
{
PO1 = 100;
PO2 = 120;
...
}
But now, you see, the work of totalling is done and it is easy to transform that into an array of dictionaries if that is what you want.
Not 100% sure if this is what you are saying or not, but to sort an array of dictionaries based on one of the elements it would look something like this.
NSDictionary *d1 = [[NSDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithDouble:100],#"PO",
[NSNumber numberWithDouble:0], #"Category",
nil];
NSDictionary *d2 = [[NSDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithDouble:50],#"PO",
[NSNumber numberWithDouble:90], #"Category",
nil];
NSArray *unsorted = #[d1, d2];
NSArray *sortedArray;
sortedArray = [unsorted sortedArrayUsingComparator:^NSComparisonResult(id a, id b) {
NSDictionary *first = (NSDictionary*)a;
NSDictionary *second = (NSDictionary*)b;
NSNumber *firstPO = [first objectForKey:#"PO"];
NSNumber *secondPO = [second objectForKey:#"PO"];
return [firstPO compare:secondPO];
}];
NSLog(#"unsorted = %#", unsorted);
NSLog(#"sorted = %#", sortedArray);
I wasn't really sure what PO was, so I just used an NSNumber as an example. Look at this page for an overview of how you would compare a customer object. http://nshipster.com/nssortdescriptor/.
Then you can loop through the array, now in the correct order and build your next NSDictionary.
I want to give a key value from my NSDictionary and get the value associated to it.
I have this:
NSArray *plistContent = [NSArray arrayWithContentsOfURL:file];
NSLog(#"array::%#", plistContent);
dict = [plistContent objectAtIndex:indexPath.row];
cell.textLabel.text = [dict objectForKey:#"code"];
with plistContent :
(
{
code = world;
key = hello;
},
{
code = 456;
key = 123;
},
{
code = 1;
key = yes;
}
)
So how do I get "hello" by giving the dictionary "world"?
If I understand your question correctly, you want to locate the dictionary where "code" = "world" in order to get the value for "key".
If you want to keep the data structure as it is, then you will have to perform a sequential search, and one way to do that is simply:
NSString *keyValue = nil;
NSString *searchCode = #"world";
for (NSDictionary *dict in plistContents) {
if ([[dict objectForKey:#"code"] isEqualToString:searchCode]) {
keyValue = [dict objectForKey:#"key"]); // found it!
break;
}
}
However if you do alot of this searching then you are better off re-organizing the data structure so that it's a dictionary of dictionaries, keyed on the "code" value, converting it like this:
NSMutableDictionary *dictOfDicts = [[NSMutableDictionary alloc] init];
for (NSDictionary *dict in plistContents) {
[dictOfDicts setObject:dict
forKey:[dict objectForKey:#"code"]];
}
(note that code will break if one of the dictionaries doesn't contain the "code" entry).
And then look-up is as simple as:
NSDictionary *dict = [dictOfDicts objectForKey:#"world"]);
This will be "dead quick".
- (NSString*) findValueByCode:(NSString*) code inArray:(NSArray*) arr
{
for(NSDictonary* dict in arr)
{
if([[dict valueForKey:#"code"] isEqualToString:code])
{
return [dict valueForKey:#"key"]
}
}
return nil;
}