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;
}
Related
I have the following object C code for receiving PubNub message.
- (void)client:(PubNub *)client didReceiveMessage:(PNMessageResult *)message {
NSLog(#"Received message: %# on channel %# at %#", message.data.message,
message.data.subscribedChannel, message.data.timetoken);
}
The returned data is
Received message: (
{
key = userName;
value = Enoch;
},
{
key = photoID;
value = 3;
},
{
key = userID;
value = 1;
},
{
key = actionType;
value = chat;
},
{
key = message;
value = H;
}
) on channel chat at 14888810882049989
I would like to parse the message to a dictionary object for accessing the "value" by using the "key"
I am very new in objective C programming and don't know how to do.
Please help.
Loop through the message array and set the key value in dictionary.
NSArray *array = (NSArray*)message.data.message;
NSMutableDictionary *dic = [[NSMutableDictionary alloc] init];
for (NSDictionary *item in array) {
[dic setObject:[item objectForKey:#"value"] forKey:[item objectForKey:#"key"]];
}
NSLog(#"%#", dic);
Or
NSArray *array = (NSArray*)message.data.message;
NSArray *values = [array valueForKey: #"value"];
NSArray *keys = [array valueForKey: #"key"];
NSDictionary *dic = [[NSDictionary alloc] initWithObjects:values forKeys:keys];
NSLog(#"%#", dic);
You can use below method for parsing your data and convert it into dictionary
ChatterBoxMessage *chatterBoxMessage = [[ChatterBoxMessage alloc] initFromDictionary: message.data.message withTimeToken: message.data.timetoken];
[chatterBoxMessage asDictionary];
By This method you will get dictionary.
Above ChatterBoxMessage is a PubNub library class.
Also you can parse your data like below :
for (NSDictionary *objectData in message.data.message) {
NSLog(#"Value : %#",objectData[#"value"]);
NSLog(#"Key : %#",objectData[#"key"]);
}
I'm trying to parse a JSON page in Objective-C by creating a subclass of NSDictionary and adding getSomeProperty methods. I have been able to do this with JSON pages that precede every [ or { with keys but am having trouble parsing the following sort of page
[ {"id":12345,"name":"name1","account_id":10002000015631,
"start_at":"2015-09-02T20:24:13","enrollments":
[{"type":"student","role":"enrollment","role_id":821,
"user_id":10000001736511,"enrollment_state":"active"}],"hide_final_grades":false,
"workflow_state":"available","restrict_enrollments_to_course_dates":false},
{"id":100000055661076,"name":"name2","account_id":100000230095635,
"start_at":"2015-08-28T21:22:41Z","grading_standard_id":null,"is_public":null,
"course_code":"name2","default_view":"wiki","enrollment_term_id":10003000007529,"end_at":null,
"public_syllabus":false,"storage_quota_mb":500,"is_public_to_auth_users":false,
"apply_assignment_group_weights":false,"calendar":{"ics":"https://someurl.ics"},
"enrollments":[{"type":"student","role":"StudentEnrollment","role_id":821,
"user_id":10000001736511,"enrollment_state":"active"}],"hide_final_grades":false,"
workflow_state":"available","restrict_enrollments_to_course_dates":false}
]
For example, for this webpage http://www.raywenderlich.com/demos/weather_sample/weather.php?format=json
I am able to create methods
- (NSDictionary *)currentCondition
{
NSDictionary *dict = self[#"data"];
NSArray *ar = dict[#"current_condition"];
return ar[0];
}
and
-(NSString*) cloudcover
{
return self[#"cloudcover"];
}
to retrieve the string #"16".
How can I use a similar method to get the #"name1" or the id #"12345" from my first example JSON code?
You have an array of dictionaries. To have an array of outputs you can use the following method:
- (NSMutableArray *)getValueString: (NSString*)string fromArray: (NSArray *)inputArray {
NSString *outputString;
NSMutableArray *outputArray = [NSMutableArray new];
for (id dict in inputArray) {
if ([[dict class] isSubclassOfClass:[NSDictionary class]]) {
outputString = [dict valueForKey: string];
}
else {
outputString = #"Name not found";
}
if (!(outputString.length > 0)) {
outputString = #"Name not found";
}
[outputArray addObject: outputString];
}
return outputArray;
}
And use it to get name with:
NSArray *resultArray = [self getValueString: #"name" fromArray: inputArray];
NSString *firstName = resultArray[0];
And to get id with:
NSArray *resultArray = [self getValueString: #"id" fromArray: inputArray];
NSString *firstId = resultArray[0];
The [ ] at the beginning and end of your JSON string indicate that it is an array, so when you parse the JSON, you will get an NSArray*, not an NSDictionary*. The first element of the array is an object, so that will be an NSDictionary*. Access id like this:
NSNumber* id = self[0][#"id"];
It looks like your currentCondition is a category on NSDictionary. If that's true and you want the above code to work, you need to make it on a category of NSArray. If it's not true, I don't understand what self is without more info.
NSDictionary *myDict = #{#"one":#"1",#"two":#"2"};
for (NSDictionary* tmp in myDict) {
NSLog(#"%#",tmp);
}
resut:
my tmpis NSString
I want to get a dictionary with key= one , value = 1
for in for NSDictionary will iterate the keys.
for (NSString * key in myDict) {
NSLog(#"%#",key);
NSString * value = [myDict objectForKey:key];
}
If you want to get a dictionary. You have to create a dictionary from these values
for (NSString * key in myDict) {
NSLog(#"%#",key);
NSString * value = [myDict objectForKey:key];
NSDictionary * dict = #{key:value};
}
Or you should init like this:
NSArray *arrDict = #[{#{"one":#"1"},#{#"two":#"2"}];
for (NSDictionary* tmp in arrDict) {
NSLog(#"%#",tmp);
}
You can get all keys from your dic then add the key and value to your new dic like this:
NSDictionary *myDict = #{#"one":#"1",#"two":#"2"};
NSArray *keys = [myDict allKeys];
for (NSString *key in keys) {
NSDictionary *yourDic = #{key: [myDict valueForKey:key]};
NSLog(#"%#", yourDic);
}
You didn't create it that way. If you wanted to have a NSDictionary inside another NSDictionary you should write something like this :
NSDictionary *myDict = #{
#"firstDict" : #{
#"one":#"1"
},
#"secondDict": #{
#"two":#"2"
}
};
Above code will create a NSDictionary with two dictionaries at keys #firstDict and #secondDict.
Also, bear in mind, that because dictionaries are key-value pairs, using a for-in loop, actually loops through the keys in that dictionary. So your code is equivalent to:
for(NSString *key in dict.allKeys) { ... }
I got the solution
NSDictionary *myDict = #{#"one":#"1",#"two":#"2"};
NSMutableArray *arrayObject = [[NSMutableArray alloc]init];
NSMutableArray *arrayKey = [[NSMutableArray alloc]init];
NSMutableArray *arrayObjectKey = [[NSMutableArray alloc]init];
NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];
for (NSString *stringValue in myDict.allValues)
{
[arrayObject addObject:stringValue];
}
for (NSString *stringKey in myDict.allKeys)
{
[arrayKey addObject:stringKey];
}
for(int i = 0;i<[arrayKey count];i++)
{
dict = [[NSMutableDictionary alloc]initWithObjectsAndKeys:[NSString stringWithFormat:#"%#",[arrayKey objectAtIndex:i]],#"key",nil];
[dict setObject:[NSString stringWithFormat:#"%#",[arrayObject objectAtIndex:i]] forKey:#"value"];
[arrayObjectKey addObject:dict];
}
NSLog(#"The arrayObjectKey is - %#",arrayObjectKey);
The Output is
The arrayObjectKey is -
(
{
key = one;
value = 1;
},
{
key = two;
value = 2;
}
)
Create the dictionary:
NSDictionary *myDict = [NSDictionary dictionaryWithObjectsAndKeys:#"1",#"One",#"2","Two",nil];
Get a value out using:(this example tmp will be 1)
NSString *tmp = [myDict objectForKey:#"One"];
Display the output in console:
NSLog(#"%#",tmp);
To display the whole NSDictionary
NSLog (#"contents of myDict: %#",myDict);
What you are doing is creating a dictionary with key-value pairs. I think what you want to do is have an array with dictionaries.
NSArray *myArray = #[#{#"one":#"1"}, #{#"two":#"2"}];
for (NSDictionary* tmp in myArray) {
NSLog(#"%#",tmp);
}
However I don't see a point in doing this. What you could do is:
NSDictionary *myDict = #{#"one":#"1",#"two":#"2"};
for (NSString* key in [myDict allKeys]) {
NSLog(#"%# = %#", key, myDict[key]);
}
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 have dictionary which i want to use to fill a tableview. It is parsed by JSON.
My dictionary looks like that:
NSLog(#"%#",temp);
// OUTPUT //
(
{
ShootingDate = "2013-07-29 00:00:00";
ShootingID = 1;
ShootingName = Testshooting;
},
{
ShootingDate = "2013-06-12 00:00:00";
ShootingID = 2;
ShootingName = Architektur;
}
)
Dictionary looks in XCode like that:
Now i want to fill a table with that data. Each row should display ShootingDate,ShootingID and ShootingName but i am not able to access these keys.
Anyone a suggestion?
First of all temp is not dictionary it is NSArray and u can get it as
for (NSDictionary *dictionary in temp) {
[dictionary valueForKey:#"ShootingDate"];
[dictionary valueForKey:#"ShootingID"];
[dictionary valueForKey:#"ShootingName"];
}
You can get your dictionary in cellforRow as
NSDictionary *tempDicts=[temp objectAtIndex:indexPath.row];
cell.textLabel.text=[NSString stringWithFormat:#"id=%#,date=%#,name=%#",[tempDicts valueForKey:#"ShootingID"],[tempDicts valueForKey:#"ShootingDate"],[tempDicts valueForKey:#"ShootingName"]];
you can access these keys as
NSString *str_ShootingDate = [[temp objectAtIndex:indexpath.row]
objectForKey:#"ShootingDate"]; //you can change this key with ShootingID
//or ShootingName