I want to auto-incrementing a key and at to a NSMutableDictionary.
I tried to do it but it wasn't work :
NSMutableDictionary *array = [[NSMutableDictionary alloc] init];
int testAutoIndex = 0;
[array setObject:[NSNumber numberWithInt:testAutoIndex++] forKey:#"index"];
[array release];
Thanks :)
Use this:
NSMutableDictionary *array = [[NSMutableDictionary alloc] init];
int testAutoIndex = 0;
[array setObject:[NSNumber numberWithInt:++testAutoIndex] forKey:#"index"];
[array release];
If you want to create a dictionary with say N entries, then it is possible to do using the code
int N = 100; // or what ever number you want
NSArray *arrayOfObjectsYouWantToPumpIntoDictionary = ....;
NSMutableDictionary *mutableDictionary = [NSMutableDictionary dictionaryWithCapacity:100];
for(int i=0;i<N;i++){
NSString *key = [NSString stringWithFormat:#"%d"i];
[mutableDictionary setObject:[arrayOfObjectsYouWantToPumpIntoDictionary objectAtIndex:i] forKey:];
}
// Later some where else if you want to retrieve object with key of x (x can be 1, or 2 or what ever value), you can do
objectToBeRetrieved = [mutableDictionary objectForKey:[NSString stringWithFormat:#"%d",x];
Related
I need to convert this "5?8?519223cef9cee4df999436c5e8f3e96a?EVAL_TIME?60?2013-03-21" string into dictionary. Separated by "?"
Dictionary would be some thing like
{
sometext1 = "5",
sometext2 = "8",
sometext3 = "519223cef9cee4df999436c5e8f3e96a",
sometext4 = "EVAL_TIME",
sometext5 = "60",
sometext6 = "2013-03-21"
}
Thank you .
Break the string to smaller strings and loop for them.
This is the way
NSArray *objects = [inputString componentsSeparatedByString:#"?"];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
int i = 1;
for (NSString *str in objects)
{
[dict setObject:str forKey:[NSString stringWithFormat:#"sometext%d", i++]];
}
Try
NSString *string = #"5?8?3519223cef9cee4df999436c5e8f3e96a?EVAL_TIME?60?2013-03-21";
NSArray *stringComponents = [string componentsSeparatedByString:#"?"];
//This is very risky, your code is at the mercy of the input string
NSArray *keys = #[#"cid",#"avid",#"sid",#"TLicense",#"LLicense",#"date"];
NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
for (int idx = 0; idx<[stringComponents count]; idx++) {
NSString *value = stringComponents[idx];
NSString *key = keys[idx];
[dictionary setObject:value forKey:key];
}
EDIT: More optimized
NSString *string = #"5?8?3519223cef9cee4df999436c5e8f3e96a?EVAL_TIME?60?2013-03-21";
NSArray *stringComponents = [string componentsSeparatedByString:#"?"];
NSArray *keys = #[#"cid",#"avid",#"sid",#"TLicense",#"LLicense",#"date"];
NSMutableDictionary *dictionary = [NSMutableDictionary dictionaryWithObjects:stringComponents forKeys:keys];
first separate the string into several arrays by '?'.
then add the string in you dictionary.
sth like this:
NSString *str = #"5?8?519223cef9cee4df999436c5e8f3e96a?EVAL_TIME?60?2013-03-21";
NSArray *valueArray = [str componentsSeparatedByString:#"?"];
NSMutableArray *keyArray = [[NSMutableArray alloc] init];
for (int i = 0; i <[valueArray count]; i ++) {
[keyArray addObject:[NSString stringWithFormat:#"sometext%d",i+1]];
}
NSDictionary *dic = [[NSDictionary alloc] initWithObjects:valueArray forKeys:keyArray];
For the future: If you were to store your data in JSON format (closer to what you have anyway), it'll be much easier to deal with and transfer between systems. You can easily read it...using NSJSONSerialization
How can I Initialize and allocate multiple objects with different name and pass it to the NSArray. from Below code the object is initialized once in loop and I need to initialized multiple times as per the For loop will go with different name..and then pass it to NSArray.please check the code below..
when For loop will start means i=0 ..initialized item would betempItemi
now next time when i=1 and i=2 the tempItemi name will be same .how can i change this with in loop..and pass it to NSArray *items
for (int i = 0; i< [Array count]; i++)
{
id object = [Array objectAtIndex:i];
if ([object isKindOfClass:[NSDictionary class]])
{
NSDictionary *objDict = (NSDictionary *)object;
ECGraphItem *tempItemi = [[ECGraphItem alloc]init];
NSString *str = [objDict objectForKey:#"title"];
NSLog(#"str value%#",str);
float f=[str floatValue];
tempItemi.isPercentage=YES;
tempItemi.yValue=f;
tempItemi.width=30;
NSArray *items = [[NSArray alloc] initWithObjects:tempItemi,nil];
//in array need to pass all the initialized values
[graph drawHistogramWithItems:items lineWidth:2 color:[UIColor blackColor]];
}
}
Why dont you just make the array mutable and then add the object each time like this:
NSMutableArray *items = [[NSMutableArray alloc] init];
// a mutable array means you can add objects to it!
for (int i = 0; i< [Array count]; i++)
{
id object = [Array objectAtIndex:i];
if ([object isKindOfClass:[NSDictionary class]])
{
NSDictionary *objDict = (NSDictionary *)object;
ECGraphItem *tempItemi = [[ECGraphItem alloc]init];
NSString *str = [objDict objectForKey:#"title"];
NSLog(#"str value%#",str);
float f=[str floatValue];
tempItemi.isPercentage=YES;
tempItemi.yValue=f;
tempItemi.width=30;
[items addObject: tempItemi];
//in array need to pass all the initialized values
}
}
[graph drawHistogramWithItems:items lineWidth:2 color:[UIColor blackColor]];
Anyways items in your original code will be reinitializing each time and you are drawing a new histogram each time so your code won't work... This should work...
The code you have written is ok but,
NSArray *items will always contain only one item at each loop.
just declare that outside for loop as NSMutableArray,
and go with the same code you are using.
As you said you want to make variable dynamically as
ECGraphItem *tempItemi = [[ECGraphItem alloc]init];
here i will be changing in the loop,
You can create a NSDictionary with key/value as per with your tempItem1/2/3/4.... as key and save values by alloc/init.
Then instead of a variable tempItem32, you will be using [dict valueForKey:#"tempItem32"].
EDIT:
Check this example if this may come handy
NSMutableDictionary *dict=[NSMutableDictionary new];
for (int i=1; i<11; i++) {
NSString *string=[NSString stringWithFormat:#"string%d",i];
[dict setObject:[NSString stringWithFormat:#"%d", i*i] forKey:string];
}
NSLog(#"dict is %#",dict);
NSString *fetch=#"string5";
NSLog(#"val:%#, for:%#",[dict valueForKey:fetch],fetch);
I have a NSMutableArray with objects of type NSMutableDictionary,
the NSMutableDictionary contains 2 keys
-Airlines (string)
-Rating (integer)
I have an NSMutableArray with all the objects and what i need is to Sum the rating of all the airline companies repeated objects, an example:
Airline Rating
A 2
B 3
B 4
C 5
The end result array will be the A = 2, C = 5 and the Sum of B´s that is equal to 7.
My code so far:
for (int i = 0; i < arrayMealRating.count; ++i) {
NSMutableDictionary *item = [arrayMealRating objectAtIndex:i];
NSLog(#"item=%#",item);
for (int j = i+1; j < arrayMealRating.count; ++j)
{
if ([[item valueForKey:#"Airline"] isEqualToString:[arrayMealRating objectAtIndex:j]]){
NSMutableDictionary *item = [arrayMealRating objectAtIndex:j];
NSMutableDictionary *item1 = [arrayMealRating objectAtIndex:i];
NSInteger auxCount = [[item valueForKey:#"setMealRating"] integerValue] + [[item1 valueForKey:#"setMealRating"] integerValue];
NSMutableDictionary *aux = [NSMutableDictionary dictionaryWithObjectsAndKeys:[item valueForKey:#"Airline"], #"Airline"
,[NSString stringWithFormat:#"%d",auxCount], #"setMealRating"
,nil];
NSLog(#"aux=%#",aux);
[arrayMealRating replaceObjectAtIndex:i withObject:aux];
}
}
}
A bit messy i know but i dont know how to work with NSMutableDictionary, any help will be much appreciated, Thanks in Advance!
Incase you dont want to change how your storing the data, heres how you would do it using key-value coding. Heres the dirrect link to the documentation for #distinctUnionOfObjects and #sum.
// Get all the airline names with no duplicates using the KVC #distinctUnionOfObjects collection operator
NSArray *airlineNames = [arrayMealRating valueForKeyPath:#"#distinctUnionOfObjects.Airline"];
// Loop through all the airlines
for (NSString *airline in airlineNames) {
// Get an array of all the dictionaries for the current airline
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"(Airline == %#)", airline];
NSArray *airlineMealRating = [arrayMealRating filteredArrayUsingPredicate:predicate];
// Get the sum of all the ratings using KVC #sum collection operator
NSNumber *rating = [airlineMealRating valueForKeyPath:#"#sum.Rating"];
NSLog(#"%#: %#", airline, rating);
}
This gives the following output
A: 2
B: 7
C: 5
I would suggest to redesign that entirely if that's at all possible.
Create a class Airline
#interface Airline : NSObject
#property (strong, nonatomic) NSString *name;
#property (strong, nonatomic) NSMutableArray *mealRatings;
- (void)addMealRating:(float)rating;
- (float)sumOfMealRatings;
#end
#implementation
- (id)initWithName:(NSString *)pName
{
self = [super init];
if (self)
{
self.name = pName;
self.mealRatings = [NSMutableArray array];
}
return self;
}
- (void)addMealRating:(float)rating
{
[self.mealRatings addObject:#(rating)];
}
- (float)sumOfRatings
{
float sum = 0;
for (NSNumber *rating in self.mealRatings)
{
sum += [rating floatValue];
}
}
#end
Then in your 'mainclass' you simply hold an NSArray with instances of your Airline objects. It might require you to change some of your existing code, but I think in the long run it saves you time and trouble. Perhaps you recognize later on, that you want to add additional properties to your Airlines. A dictionary is a cumbersome way to do that.
#try this
NSMutableArray *myArray = [[NSMutableArray alloc] initWithCapacity:4];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
[dict setValue:[NSNumber numberWithInteger:2] forKey:#"A"];
[myArray addObject:dict];
NSMutableDictionary *dict2 = [[NSMutableDictionary alloc] init];
[dict2 setValue:[NSNumber numberWithInteger:3] forKey:#"B"];
[myArray addObject:dict2];
NSMutableDictionary *dict3 = [[NSMutableDictionary alloc] init];
[dict3 setValue:[NSNumber numberWithInteger:4] forKey:#"B"];
[myArray addObject:dict3];
NSMutableDictionary *dict4 = [[NSMutableDictionary alloc] init];
[dict4 setValue:[NSNumber numberWithInteger:5] forKey:#"D"];
[myArray addObject:dict4];
NSMutableDictionary *resultDictionary = [[NSMutableDictionary alloc] init];
for(NSMutableDictionary *dictionary in myArray)
{
NSString *key = [[dictionary allKeys] objectAtIndex:0];
NSInteger previousValue = [[resultDictionary objectForKey:key] integerValue];
NSInteger value = [[dictionary objectForKey:key] integerValue];
previousValue += value;
[resultDictionary setObject:[NSNumber numberWithInteger:previousValue] forKey:key];
}
for(NSString *key in resultDictionary)
{
NSLog(#"value for key = %# = %d",key, [[resultDictionary valueForKey:key] integerValue]);
}
I'm trying to add some vales to a NSMutableDictionary dynamically. However, using the following code, I'm adding values using the first letter as the key to a temporary dictionary and then finally adding it to my names dictionary but it just overwrites each value for it's corresponding key
NSMutableDictionary *dictionary = [[[NSMutableDictionary alloc] init] autorelease];
for (NSString *drugStr in listContents) {
NSString *substring = [drugStr substringToIndex:1];
[dictionary setValue:drugStr forKey:substring];
}
names = [[NSDictionary alloc] initWithDictionary:dictionary];
[dictionary release];
What am I doing wrong?
You should define your NSDictionary to use NSString as a key, and NSArray as a value.
Then you should just retrieve your value according to the given key. If the result is nil, then you need to create a new NSMutableArray, to which you add the value above. IF the result is not-nil, add the value to the array.
NSMutableDictionary *dictionary = [[[NSMutableDictionary alloc] init] autorelease];
for (NSString *drugStr in listContents) {
NSString *substring = [drugStr substringToIndex:1];
NSMutableArray *valueArray = (NSMutableArray*)[dictionary objectForKey:substring];
if(valueArray==nil){
NSMutableArray *newArray = [NSMutableArray arrayWithCapacity:5];
[newArray addObject:drugStr];
[dictionary setObject:newArray forKey:substring];
}else{
[valueArray addObject:drugStr];
}
}
names = [[NSDictionary alloc] initWithDictionary:dictionary];
[dictionary release];
I am using a for loop to (currently) NSLog the contents of a NSArray. However I would like to set the contents of the array into a NSMutableDictionary, depending on the objectAtIndex it is. Currently there are 843 objects in the array, and therefore I would rather not have to type out the same thing over and over again!
My code currently is this
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
string = [string stringByReplacingOccurrencesOfString:#"\n" withString:#""];
NSArray *chunks = [string componentsSeparatedByString:#","];
for (int i = 0; i < [chunks count]; i ++) {
NSLog(#"%#", [chunks objectAtIndex:i]);
}
I would like to set the contents of the array into the NSMutableDictionary in the following fashion, and once the objectAtIndex is 11, I would like to set the 12th object in the dictionary to be of the key #"type" and soforth:
[dict setObject:[chunks objectAtIndex:0] forKey:#"type"];
[dict setObject:[chunks objectAtIndex:1] forKey:#"name"];
[dict setObject:[chunks objectAtIndex:2] forKey:#"street"];
[dict setObject:[chunks objectAtIndex:3] forKey:#"address1"];
[dict setObject:[chunks objectAtIndex:4] forKey:#"address2"];
[dict setObject:[chunks objectAtIndex:5] forKey:#"town"];
[dict setObject:[chunks objectAtIndex:6] forKey:#"county"];
[dict setObject:[chunks objectAtIndex:7] forKey:#"postcode"];
[dict setObject:[chunks objectAtIndex:8] forKey:#"number"];
[dict setObject:[chunks objectAtIndex:9] forKey:#"coffee club"];
[dict setObject:[chunks objectAtIndex:10] forKey:#"latitude"];
[dict setObject:[chunks objectAtIndex:11] forKey:#"longitude"];
I'm not sure I fully understand the question, but I think that your chunks array contains a long list of data, ordered in the same way (i.e. 0th, 12th, 24th, 36th... elements are all type, and 1st, 13th, 25th, 37th... elements are all name). If this is the case, you could use something like this:
NSArray *keys = [NSArray arrayWithObjects:#"type", #"name", #"street", #"address1", #"address2", #"town", #"county", #"postcode", #"number", #"coffee club", #"latitude", #"longitude", nil];
for (NSUInteger i = 0; i < [chunks count]; i += [keys count])
{
NSArray *subarray = [chunks subarrayWithRange:NSMakeRange(i, [keys count])];
NSDictionary *dict = [[NSDictionary alloc] initWithObjects:subarray forKeys:keys];
// do something with dict
[dict release];
}
Note that you can't have two different values for the same key with NSDictionary. That is, if you set two different values for the type key, only the last value set will be kept.
Edit
If your array is not a multiple of 12 because for example it contains garbage data at the end, you could use a different looping style instead:
// max should be a multiple of 12 (number of elements in keys array)
NSUInteger max = [chunks count] - ([chunks count] % [keys count]);
NSUInteger i = 0;
while (i < max)
{
NSArray *subarray = [chunks subarrayWithRange:NSMakeRange(i, [keys count])];
NSDictionary *dict = [[NSDictionary alloc] initWithObjects:subarray forKeys:keys];
// do something with dict
[dict release];
i += [keys count];
}
Since there's no pattern to your keys, you're better off doing it manually like you're doing it now.
The most straightforward thing to do would be to use the code you posted. But if you really want to use a loop, something like this should do.
NSArray *keys = [NSArray arrayWithObjects:#"type", #"name", #"street", #"address1", #"address2", #"town", #"county", #"postcode", #"number", #"coffee club", #"latitude", #"longitude", nil];
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
string = [string stringByReplacingOccurrencesOfString:#"\n" withString:#""];
NSArray *chunks = [string componentsSeparatedByString:#","];
for (int i = 0; i < [chunks count] && i < [keys count]; i ++) {
[dict setObject:[chunks objectAtIndex:i] forKey:[keys objectAtIndex:i]];
}
NSArray* keys = [NSArray arrayWithObjects:#"type",#"name",#"street",#"address1",#"address2",#"town",#"county",#"postcode",#"number",#"coffee club",#"latitude",#"longitude",nil];
for (int i = 0; i < [chunks count]; i ++){
[dict setObject:[chucks objectAtIndex:i] forKey:[keys objectAtIndex:i]];
}