I'm getting the n value from the user, according to it I want to create n number of NSMutableArray .
Yes you can, just add the arrays to another NSMutableArray. Use this code:
NSMutableArray *outerArray = [NSMutableArray arrayWithCapacity:n];
for (int i=0; i<n; i++) {
NSMutableArray *innerArray = [[NSMutableArray alloc] init];
[outerArray addObject:innerArray];
}
int n= 5; // or whatever user gives you
count = 0;
NSMutableArray *arrayOfArrays = [NSMutableArray array];
while(count < n)
{
NSMutableArray *anArray = [NSMutableArray array];
[arrayOfArrays addObject: anArray];
count ++;
}
By using an array of arrays:
NSMutableArray *arrays = [NSMutableArray new];
while (gotMoreInput) {
NSMutableArray *array = [NSMutableArray new];
[array addObject:#"Some data"];
[arrays addObject:array];
}
Related
for (int i=0; i<array.count; i++)
{
NSString *name = [NSString stringWithFormat:#"array%i",i];
NSMutableArray *stringName = [[NSMutableArray alloc] init];
}
I don't know its right or wrong i just want to create count number of times NSMutableArray Should create with different names like
the name string represent
name = array0
name = array1
name = array2.....name=array10
I want to Create
NSMutableArray *array0 = [[NSMutableArray alloc]init];
NSMutableArray *array1 = [[NSMutableArray alloc]init];
NSMutableArray *array2 = [[NSMutableArray alloc]init];
.
.
.
NSMutableArray *array10 = [[NSMutableArray alloc]init];
Like this
NSMutableArray *myArray = [NSMutableArray new];
for(int i=0;i<numOfSubArrays;i++){
NSMutableArray *tempArray = [NSMutableArray new];
[myArray addObject: tempArray];
}
[myArray[0] addObject:object00];
[myArray[0] addObject:object01];
.
.
[myArray[1] addObject:object10];
[myArray[1] addObject:object11];
//etc
//myArray[1][1] is object11
I am sorting an array.
There are three types of elements in the array.
1. featured
2. organic and
3. claimed.
Among them, I want to sort only organic elements and keep the featured and claimed elements at their own index.
Below is my code in which, I am extracting the claimed and featured indices in a dictionary as key being the index and value is the array element.
//Initialization
NSMutableArray *sortedArray = nil;
NSMutableDictionary *tempFeaturedDictionary = [[NSMutableDictionary alloc]init];
NSMutableDictionary *tempClaimedDictionary = [[NSMutableDictionary alloc]init];
NSMutableArray *tempOrganicArray = [[NSMutableArray alloc]init];
for (int i = 0; i < array.count; i++) {
DRListing *isFeaturedObj = (DRListing*)[array objectAtIndex:i];
if (isFeaturedObj.featured) {
[tempFeaturedDictionary setObject:isFeaturedObj forKey:[#(i)stringValue]];
}else if (isFeaturedObj.claimed)
{
[tempClaimedDictionary setObject:isFeaturedObj forKey:[#(i)stringValue]];
}else
[tempOrganicArray addObject:isFeaturedObj];
}
Again I am adding the claimed and featured back to their original indices after sorting as:
sortedArray = [NSMutableArray arrayWithArray:[tempOrganicArray sortedArrayUsingDescriptors:sortDescriptorsArray]];
for (int i = 0; i<sortedArray.count; i++) {
for (NSString *key in tempFeaturedDictionary) {
if ( [[#(i)stringValue] isEqualToString: key] ) {
[sortedArray insertObject:[tempFeaturedDictionary objectForKey:[#(i)stringValue]] atIndex:i];
}}
for (NSString *key in tempClaimedDictionary) {
if ([[#(i)stringValue]isEqualToString:key ]) {
[sortedArray insertObject:[tempClaimedDictionary objectForKey:[#(i)stringValue]] atIndex:i];
}
}
}
The code works good. Except there is claimed/(and)featured elements at the last index of the 'array'. Because the 'sortedArray' index remains less than the 'array.count' in this scenario.
Thanks in advance.
Update -
I receive response array of type:
[{featured1 featured2}, {organic1, organic2..}, {claimed1}, {featured11, featured12}, {organic11, organic12..}, {claimed2}, ..]
and I am allowed to sort only organic elements within this array. Featured and claimed should not loose their original index position.
I would iterate through the array, extracting the organics to sort. Then sort your organic array. Then iterate through the original array taking either the element from the original array or an element from the sorted organics array as appropriate.
NSMutableArray *organicsArray = [NSMutableArray new];
for (int i = 0; i < array.count; i++) {
DRListing *isFeaturedObj = (DRListing*)array[i];
if ((!isFeaturedObj.featured) && (!isFeaturedObj.claimed)) {
[organicsArray addObject:isFeaturedObj];
}
}
NSMutableArray *sortedOrganicsArray = [[organicsArray sortedArrayUsingDescriptors:sortDescriptorsArray] mutableCopy];
NSMutableArray *outputArray = [NSMutableArray new];
for (int i = 0; i < array.count; i++) {
DRListing *isFeaturedObj = (DRListing*)array[i];
if ((!isFeaturedObj.featured) && (!isFeaturedObj.claimed)) {
[outputArray addObject:sortedOrganicsArray[0]];
[sortedOrganicsArray removeObjectAtIndex:0];
} else {
[outputArray addObject:isFeaturedObject];
}
}
You could possibly make it a little more efficient if you reversed your sort order for the organics array since then you could say
[outputArray addObject:[sortedOrganicsArray lastObject]];
[sortedOrganicsArray removeLastObject];
But if your array isn't particularly large then the performance improvement will probably be negligible.
Maybe this is an alternative:
NSMutableArray *organics = [NSMutableArray new];
NSMutableArray *others = [NSMutableArray new];
for (DRListing *isFeaturedObj in array) {
if (isFeaturedObj.organic) {
[organics addObject:isFeaturedObj];
} else {
[others addObject:isFeaturedObj];
}
}
NSMutableArray *sorted = [NSMutableArray alloc]initWithObjects:organics,others, nil];
You can take the first 2 functions. The others are what I used for testing.
- (DRListing *)getNextObjectFromArray:(NSArray *)array WithStartingIndex:(int)index
{
for (int i=index; i<array.count; i++) {
DRListing *obj = (DRListing*)[array objectAtIndex:i];
if (!obj.featured && !obj.claimed)
{
return obj;
}
}
return nil;
}
- (void)sortArray:(NSMutableArray *)array
{
for (int pass = 0; pass<array.count-1; pass++) {
for (int i=0; i<array.count-1; i++) {
DRListing *obj = [self getNextObjectFromArray:array WithStartingIndex:i];
int foundIndex = (int)[array indexOfObject:obj];
DRListing *obj2 = [self getNextObjectFromArray:array WithStartingIndex:foundIndex+1];
int foundIndex2 = (int)[array indexOfObject:obj2];
if (obj!=nil && obj2 !=nil) {
if (obj.value >= obj2.value) {
[array exchangeObjectAtIndex:foundIndex withObjectAtIndex:foundIndex2];
}
i = foundIndex;
}
}
}
NSLog(#"Sorted Data: %#",array);
}
- (NSMutableArray *)testData
{
NSMutableArray *array = [NSMutableArray new];
for (int i=0; i<20; i++) {
DRListing *obj = [DRListing new];
obj.featured = i*i%2;
obj.claimed = i%2;
obj.value = i*3%10;
[array addObject:obj];
}
NSLog(#"Test Data: %#",array);
return array;
}
#interface DRListing : NSObject
#property (nonatomic) BOOL featured;
#property (nonatomic) BOOL claimed;
#property (nonatomic) int value;
#end
NSArray*arr = #[#"ram",#"Ram",#"vinoth",#"kiran",#"kiran"];
NSSet* uniqueName = [[NSSet alloc]initWithArray:arr];
NSLog(#"Unique Names :%#",uniqueName);
Output:
but i need the output as
You could first convert them all to lowercase strings.
NSArray *arr = #[#"ram",#"Ram",#"vinoth",#"kiran",#"kiran"];
NSArray *lowerCaseArr = [arr valueForKey:#"lowercaseString"];
NSSet* uniqueName = [[NSSet alloc] initWithArray:lowerCaseArr];
NSLog(#"Unique Names :%#",uniqueName);
Unique Names :{(
ram,
kiran,
vinoth
)}
Try this:
NSArray *arr = [NSArray arrayWithObjects:#"Ram",#"ram", nil]; //this is your array
NSMutableArray *arr1 = [[NSMutableArray alloc]init]; //make a nsmutableArray
for (int i = 0; i<[arr count]; i++) {
[arr1 addObject:[[arr objectAtIndex:i]lowercaseString]];
}
NSSet *set = [NSSet setWithArray:(NSArray*)arr1];//this set has unique values
This will always preserve casing form that was existing in your original container (although it's undefined which casing):
NSArray<NSString*>* input = ...
NSMutableDictionary* tmp = [[NSMutableDictionary alloc] init];
for (NSString* s in input) {
[tmp setObject:s forKey:[s lowercaseString]];
}
return [tmp allValues];
Create a mutable array the same size as arr. Fill it with lowercaseString versions of each element of arr. Make the set out of that.
#Updated
Using this you remove uppercase string from your array.
NSMutableArray *arr= [[NSMutableArray alloc]initWithObjects:#"ram",#"Ram",#"vinoth",#"kiran", nil];
NSMutableArray *arrCopy = [[NSMutableArray alloc]init];
for (int index = 0 ; index<arr.count; index++) {
NSUInteger count = [[[[arr objectAtIndex:index] componentsSeparatedByCharactersInSet:[[NSCharacterSet uppercaseLetterCharacterSet] invertedSet]] componentsJoinedByString:#""] length];
if (count == 0) {
[arrCopy addObject:[arr objectAtIndex:index]];
}
}
NSLog(#"Print Mutable Copy %#",arrCopy);
try this one
NSArray *copyArray = [mainArray copy];
NSInteger index = [copyArray count] - 1;
for (id object in [copyArray reverseObjectEnumerator]) {
if ([mainArray indexOfObject:object inRange:NSMakeRange(0, index)] != NSNotFound) {
[mainArray removeObjectAtIndex:index];
}
index--;
}
copyArray=nil;
I have an NSArray some thing like in the following format.
The group array is :
(
"Q-1-A1",
"Q-1-A9",
"Q-2-A1",
"Q-2-A5",
"Q-3-A1",
"Q-3-A8",
"Q-4-A1",
"Q-4-A4",
"Q-10-A2",
"Q-8-A2",
"Q-9-A2",
"Q-7-A1",
"Q-5-A2"
)
Now what i have to do is group the array elements some thing like this.
1 = ( "Q-1-A1","Q-1-A9")
2 = ("Q-2-A1","Q-2-A5",) ...
10 =("Q-10-A2")
can any one please help me how can i achieve this.
Thanks in advance.
Try
NSArray *array = #[#"Q-1-A1",
#"Q-1-A9",
#"Q-2-A1",
#"Q-2-A5",
#"Q-3-A1",
#"Q-3-A8",
#"Q-4-A1",
#"Q-4-A4",
#"Q-10-A2",
#"Q-8-A2",
#"Q-9-A2",
#"Q-7-A1",
#"Q-5-A2"];
NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
for (NSString *string in array) {
NSArray *components = [string componentsSeparatedByString:#"-"];
NSString *key = components[1];
NSMutableArray *tempArray = dictionary[key];
if (!tempArray) {
tempArray = [NSMutableArray array];
}
[tempArray addObject:string];
dictionary[key] = tempArray;
}
Create an NSMutableDictionary, then iterate through your 'group array'.
For each NSString object:
get the NSArray of componentsSeparatedByString:#"-"
use the second component to create a key and retrieve the object for that key from your mutable dictionary. If its nil then set it to an empty NSMutableArray.
add the original NSString to the mutable array.
Try this
NSArray *arrData =[[NSArray alloc]initWithObjects:#"Q-1-A1",#"Q-1-A9",#"Q-2-A1",#"Q-2-A5",#"Q-3-A1",#"Q-3-A8",#"Q-4-A1",#"Q-4-A4",#"Q-10-A2",#"Q-8-A2",#"Q-9-A2",#"Q-7-A1",#"Q-5-A2", nil ];
NSMutableDictionary *dictList = [[NSMutableDictionary alloc]init];
for (int i=0; i<[arrData count];i++) {
NSArray *arrItem = [[arrData objectAtIndex:i] componentsSeparatedByString:#"-"];
NSMutableArray *arrSplitedItems = [dictList valueForKey:[arrItem objectAtIndex:1]];
if (!arrSplitedItems) {
arrSplitedItems = [NSMutableArray array];
}
[arrSplitedItems addObject:[arrData objectAtIndex:i]];
[dictList setValue:arrSplitedItems forKey:[arrItem objectAtIndex:1]];
}
NSArray *sortedKeys =[dictList allKeys];
NSArray *sortedArray = [sortedKeys sortedArrayUsingComparator:^(id str1, id str2) {
return [((NSString *)str1) compare:((NSString *)str2) options:NSNumericSearch];
}];
for (int i=0; i<[sortedArray count]; i++) {
NSLog(#"%#",[dictList objectForKey:[sortedArray objectAtIndex:i]]);
}
listOfYourMainArray/// Its YOur main Array;
temArray = (NSArray *)listOfYourMainArray; // Add Your main array to `temArray`.
NSMutableDictionary *lastDic = [[NSMutableDictionary alloc] init]; /// YOu need to creat Dictionary for arrange your values.
for (int i = 0; i< listOfYourMainArray.count; i++)
{
for (int j = 0 ; j < temArray.count; j ++)
{
if (([[temArray objectAtIndex:j] rangeOfString:[NSString stringWithFormat:#"Q-%d", i] options:NSCaseInsensitiveSearch].location != NSNotFound))
{
[lastDic setValue:[temArray objectAtIndex:j] forKey:[NSString stringWithFormat:#"%d", i]];
}
}
}
NSLog(#"%#", lastDic)
I have one NSMutableArray *arr1 with values:
{(B,abc) (E,pqr) (C,xyz)}
and another NSMutableArray *arr2 with
{(B) (C) (E)}.
Now i want to sort arr1 using arr2 value so that arr1 becomes {(B,abc) (C,xyz) (E,pqr)}. How can i do this?
So, it seems you have an array and an array of arrays:
NSArray *sorter = #[#"B", #"C", #"E"];
NSMutableArray *sortee = [#[
#[#"B", #"abc"],
#[#"E", #"pqr"],
#[#"C", #"xyz"]
] mutableCopy];
[sortee sortUsingComparator:^(id o1, id o2) {
NSString *s1 = [o1 objectAtIndex:0];
NSString *s2 = [o2 objectAtIndex:0];
NSInteger idx1 = [sorter indexOfObject:s1];
NSInteger idx2 = [sorter indexOfObject:s2];
return idx1 - idx2;
}];
Try this,
NSMutableArray *unsortedArray = [NSMutableArray arrayWithObjects:[NSArray arrayWithObjects:#"B",#"abc", nil],[NSArray arrayWithObjects:#"E",#"pqr", nil],[NSArray arrayWithObjects:#"C",#"xyz", nil],nil];
NSArray *guideArray = [NSArray arrayWithObjects:#"B",#"C",#"E", nil];
for(int i=0; i< [guideArray count];i++)
{
for(int j=0; j< [unsortedArray count];j++)
{
if([[unsortedArray objectAtIndex:j] containsObject:[guideArray objectAtIndex:i]])
{
[unsortedArray exchangeObjectAtIndex:j withObjectAtIndex:i];
break;
}
}
}
NSLog(#"%#",unsortedArray);
I have tested this and working for me. Hope this helps you.