I have this code in objc that creates an array with some values from realm
get.m
-(void) menuTest {
RLMResults<activity *> *test = [activity allObjects];
NSMutableArray *tmpArray = [[NSMutableArray alloc] init];
for(activity *n in test){
[tmpArray addObject:n];
}
}
And I want to have access to that array in my swift class to populate some dropdown menu. As of now I am calling it like this but it tells me it doesn't conform to protocol.
let get = get()
for n in get.menuTest(){
array.append(n)
}
How can I make a call to the objc array?
The menuTest function returns void, if you want to access the array you have to change it in this way:
- (NSMutableArray*)menuItems {
RLMResults<activity *> *test = [activity allObjects];
NSMutableArray *tmpArray = [[NSMutableArray alloc] init];
for(activity *n in test){
[tmpArray addObject:n];
}
return tmpArray
}
Related
I have an NSMutableArray that contains several NSMutableDictionary object, each dict has a NSString and an NSMutableArray in it.
My problem is that I need to find the correct dict based on a string match and when found insert an object into the NSMutableArray in the same dict where the string match was found, I can only make this work the first time when the array is empty because after that I am unable to match the correct string:
Here is what I have tried so far, I tried using contains object but that wont get me inside the dict inside the array so I am stuck
NSMutableArray *variantOptions = [[NSMutableArray alloc] init];
for (NSDictionary *variant in variantInfo) {
NSMutableDictionary *variantOption = [[NSMutableDictionary alloc] init];
NSMutableArray *variantOptionValues = [[NSMutableArray alloc] init];
NSString *name = variant[#"name"];
NSString *value = variant[#"value"];
if(variantOptions.count > 0) {
// Need to loop through the array until name isEquaToString variantOptionName and when true insert value into variantOptionValuesArray in that same dict and if not exists create a new dict and insert in array
} else {
[variantOptionValues addObject:value];
[variantOption setObject:name forKey:#"variantOptionName"];
[variantOption setObject:variantOptionValues forKey:#"variantOptionValues"];
}
[variantOptions addObject:variantOption];
}
for (NSDictionary *variant in variantInfo) {
NSString *name = variant[#"name"];
NSString *value = variant[#"value"];
BOOL found = false;
for (NSMutableDictionary *v in variantOptions) {
if (v[#"name"] isequalToString:name]) {
NSMutableArray *values = v[#"variantOptionValues"];
[values addObject:value];
found = true;
break;
}
}
if (!found) {
// name was not found
NSMutableDictionary *variantOption = [[NSMutableDictionary alloc] init];
NSMutableArray *variantOptionValues = [NSMutableArray alloc] init];
[variantOptionValues addObject:value];
[variantOption setObject:name forKey:#"variantOptionName"];
[variantOption setObject:variantOptionValues forKey:#"variantOptionValues"];
[variantOptions addObject:variantOption];
}
}
How can i insert value in array in one method and work with this full of value array in other method.
-(void)firstMethod {
NSMutableArray *array = [[NSMutableArray alloc] init];
../// add some value in array.
}
-(void)secondMethod {
..// here i want to work with array which consist of value from first method.
}
You can create one instance of NSMutableArray and use that in the both method.
#interface ViewController () {
NSMutableArray *array;
}
#end
Now access this array in both methods
-(void)firstMethod {
array = [[NSMutableArray alloc] init];
[array addObject:#"Hello"];
}
-(void)secondMethod {
if (array) {
[array addObject:#"World"];//Add object that you want
}
else {
array = [[NSMutableArray alloc] init];
[array addObject:#"World"];
}
}
You can declare a NSMutableArray property
#interface ViewController ()
#property(nonatomic,strong)NSMutableArray *array;
#end
create instance in init method
- (instancetype)init{
if(self == [super init]) {
_array = [NSMutableArray array];
}
return self;
}
-(void)firstMethod {
[self.array addObject:#"obj1"];
}
-(void)secondMethod {
[self.array addObject:#"obj2"];
}
YOU CAN USE BELOW CODE:
#property (nonatomic, strong) dispatch_queue_t concurrentQueue;
_concurrentQueue= dispatch_queue_create("any String", DISPATCH_QUEUE_CONCURRENT);
- (NSArray *)secondMethod
{
__block NSArray *array;
dispatch_sync(self.concurrentQueue, ^{
array= [NSArray arrayWithArray:array];
});
return array;
}
- (void)firstMethod:(NSString *)str
{
if (str) {
dispatch_barrier_async(self.concurrentQueue, ^{
[array addObject:str];
dispatch_async(dispatch_get_main_queue(), ^{
//Do some asynchronous work
});
});
}
}
Other answers suggest you to declare array as property. But usually it's more clear to just pass needed data as arguments to another method:
-(void)firstMethod {
NSMutableArray *array = [[NSMutableArray alloc] init];
../// add some value in array.
[self secondMethod:array];
}
-(void)secondMethod:(NSArray *)array {
..// here i want to work with array which consist of value from first method.
}
I have a horizontally and vertically scrollable table. I get the data for the header and first column from the web service(json). I want to sort the data in ascending order and remove duplicate data from both header and the first column. For removing duplicate values I used the following code:
-(void) requestFinished: (ASIHTTPRequest *) request
{
NSString *theJSON = [request responseString];
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSMutableArray *jsonDictionary = [parser objectWithString:theJSON error:nil];
headData = [[NSMutableArray alloc] init];
NSMutableArray *head = [[NSMutableArray alloc] init];
leftTableData = [[NSMutableArray alloc] init];
NSMutableArray *left = [[NSMutableArray alloc] init];
rightTableData = [[NSMutableArray alloc]init];
for (NSMutableArray *dictionary in jsonDictionary)
{
Model *model = [[Model alloc]init];
model.cid = [[dictionary valueForKey:#"cid"]intValue];
model.iid = [[dictionary valueForKey:#"iid"]intValue];
model.yr = [[dictionary valueForKey:#"yr"]intValue];
model.val = [dictionary valueForKey:#"val"];
[mainTableData addObject:model];
[head addObject:[NSString stringWithFormat:#"%ld", model.yr]];
[left addObject:[NSString stringWithFormat:#"%ld", model.iid]];
}
NSOrderedSet *orderedSet = [NSOrderedSet orderedSetWithArray:head];
headData = [[orderedSet array] mutableCopy];
// NSSet *set = [NSSet setWithArray:left];
// NSArray *array2 = [set allObjects];
// NSLog(#"%#", array2);
NSOrderedSet *orderedSet1 = [NSOrderedSet orderedSetWithArray:left];
NSMutableArray *arrLeft = [[orderedSet1 array] mutableCopy];
//remove duplicate enteries from header array
[leftTableData addObject:arrLeft];
NSMutableArray *right = [[NSMutableArray alloc]init];
for (int i = 0; i < arrLeft.count; i++)
{
NSMutableArray *array = [[NSMutableArray alloc] init];
for (int j = 0; j < headData.count; j++)
{
/* NSPredicate *predicate = [NSPredicate predicateWithFormat:#"SELF.iid == %ld", [[arrLeft objectAtIndex:i] intValue]];
NSArray *filteredArray = [mainTableData filteredArrayUsingPredicate:predicate];*/
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"SELF.iid == %ld AND SELF.yr == %ld", [[arrLeft objectAtIndex:i] intValue], [[headData objectAtIndex:j] intValue]];
NSArray *filteredArray = [mainTableData filteredArrayUsingPredicate:predicate];
if([filteredArray count]>0)
{
Model *model = [filteredArray objectAtIndex:0];
[array addObject:model.val];
}
}
[right addObject:array];
}
[rightTableData addObject:right];
}
How will I sort the arrays in ascending order?
Please help.
OK, so you have a model object that looks something like this...
#interface Model: NSObject
#property NSNumber *idNumber;
#property NSNumber *year;
#property NSString *value;
#end
Note, I am intentionally using NSNumber and not NSInteger for reasons that will become clear.
At the moment you are trying to do a lot all in one place. Don't do this.
Create a new object to store this data. You can then add methods to get the data you need. Seeing as you are displaying in a table view sectioned by year and then each section ordered by idNumber then I'd do something like this...
#interface ObjectStore: NSObject
- (void)addModelObject:(Model *)model;
// standard table information
- (NSInteger)numberOfYears;
- (NSInteger)numberOfIdsForSection:(NSinteger)section;
// convenience methods
- (NSNumber *)yearForSection:(NSInteger)section;
- (NSNumber *)idNumberForSection:(NSInteger)section row:(NSInteger)row;
- (NSArray *)modelsForSection:(NSInteger)section row:(NSInteger)row;
// now you need a way to add objects
- (void)addModelObject:(Model *)model;
#end
Now to implement it.
We are going to store everything in one dictionary. The keys will be years and the objects will be dictionaries. In these dictionaries the keys will be idNumbers and the objects will be arrays. These array will hold the models.
So like this...
{
2010 : {
1 : [a, b, c],
3 : [c, d, e]
},
2013 : {
1 : [g, h, u],
2 : [e, j, s]
}
}
We'll do this with all the convenience methods also.
#interface ObjectStore: NSObject
#property NSMutableDictionary *objectDictionary;
#end
#implementation ObjectStore
+ (instancetype)init
{
self = [super init];
if (self) {
self.objectDictionary = [NSMutableDictionary dictionary];
}
return self;
}
+ (NSInteger)numberOfYears
{
return self.objectDictionary.count;
}
+ (NSInteger)numberOfIdsForSection:(NSinteger)section
{
// we need to get the year for this section in order of the years.
// lets create a method to do that for us.
NSNumber *year = [self yearForSection:section];
NSDictionary *idsForYear = self.objectDictionary[year];
return idsForYear.count;
}
- (NSNumber *)yearForSection:(NSInteger)section
{
// get all the years and sort them in order
NSArray *years = [[self.obejctDictionary allKeys] sortedArrayUsingSelector:#selector(compare:)];
// return the correct year
return years[section];
}
- (NSNumber *)idNumberForSection:(NSInteger)section row:(NSInteger)row
{
// same as the year function but for id
NSNumber *year = [self yearForSection:section];
NSArray *idNumbers = [[self.objectDictionary allKeys]sortedArrayUsingSelector:#selector(compare:)];
return idNumbers[row];
}
- (NSArray *)modelsForSection:(NSInteger)section row:(NSInteger)row
{
NSNumber *year = [self yearForSection:section];
NSNumber *idNumber = [self idForSection:section row:row];
return self.objectDictionary[year][idNumber];
}
// now we need a way to add objects that will put them into the correct place.
- (void)addModelObject:(Model *)model
{
NSNumber *modelYear = model.year;
NSNumber *modelId = model.idNumber;
// get the correct storage location out of the object dictionary
NSMutableDictionary *idDictionary = [self.objectDictionary[modelYear] mutableCopy];
// there is a better way to do this but can't think atm
if (!idDictionary) {
idDictionary = [NSMutableDictionary dictionary];
}
NSMutableArray *modelArray = [idDictionary[modelId] mutableCopy];
if (!modelArray) {
modelArray = [NSMutableArray array];
}
// insert the model in the correct place.
[modelArray addObject:model];
idDictionary[modelId] = modelArray;
self.objectDictionary[modelYear] = idDictionary;
}
#end
With all this set up you can now replace your complex function with this...
-(void) requestFinished: (ASIHTTPRequest *) request
{
NSString *theJSON = [request responseString];
SBJsonParser *parser = [[SBJsonParser alloc] init];
NSDictionary *jsonDictionary = [parser objectWithString:theJSON error:nil];
for (NSDictionary *dictionary in jsonDictionary)
{
Model *model = [[Model alloc]init];
model.cid = [dictionary valueForKey:#"cid"];
model.idNumber = [dictionary valueForKey:#"iid"];
model.year = [dictionary valueForKey:#"yr"];
model.val = [dictionary valueForKey:#"val"];
[self.objectStore addModelObject:model];
}
}
To get the models out for a particular row then just use...
[self.objectStore modelsForSection:indexPath.section row:indexPath.row];
To get the number of sections in the tableview delegate method...
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [self.objectStore numberOfYears];
}
No messing around with the model in the view controller.
Welcome to the MVC pattern.
There's a crap ton of code here but by placing all the code here you can remove all the complex code from your VC.
NSSet keeps only non-duplicate objects within themselves so to keep only unique objects in array you can use NSSet as -
Suppose you have array with duplicate objects
NSArray *arrayA = #[#"a", #"b", #"a", #"c", #"a"];
NSLog(#"arrayA is: %#", arrayA);
//create a set with the objects from above array as
//the set will not contain the duplicate objects from above array
NSSet *set = [NSSet setWithArray: arrayA];
// create another array from the objects of the set
NSArray *arrayB = [set allObjects];
NSLog(#"arrayB is: %#", set);
The output from the above looks like:
arrayA is: (
a,
b,
a,
c,
a
)
arrayB is: {(
b,
c,
a
)}
and to sort a mutable array in ascending order you can use NSSortDescriptor and sortUsingDescriptors:sortDescriptors. Also you need to provide the key on the basis of which array will be sorted.
NSSortDescriptor *sortDescriptor;
sortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"key" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
[array sortUsingDescriptors:sortDescriptors];
[sortDescriptor release];
Here you will get what you want.
//sort description will used to sort array.
NSSortDescriptor *descriptor=[[NSSortDescriptor alloc] initWithKey:#"iid" ascending:YES];
NSArray *descriptors=[NSArray arrayWithObject: descriptor];
NSArray *reverseOrder=[arrLeft sortedArrayUsingDescriptors:descriptors];
reverseOrder is your desire output.
there is another way you can sort objects that followed model.
NSArray *someArray = /* however you get an array */
NSArray *sortedArray = [someArray sortedArrayUsingComparator:^(id obj1, id obj2) {
NSNumber *rank1 = [obj1 valueForKeyPath:#"iid"];
NSNumber *rank2 = [obj2 valueForKeyPath:#"iid"];
return (NSComparisonResult)[rank1 compare:rank2];
}];
here sortedArray is our output.
you can replace same things for yr key as well.
This is what I did to sort the header data in ascending order and to remove duplicates from both header and leftmost column. Hope this will help others
NSOrderedSet *orderedSet3 = [NSOrderedSet orderedSetWithArray:head3];
headData3 = [[orderedSet3 array] mutableCopy];
[headData3 sortUsingComparator:^NSComparisonResult(NSString *str1, NSString *str2)
{
return [str1 compare:str2 options:(NSNumericSearch)];
}];
NSOrderedSet *orderedSet4 = [NSOrderedSet orderedSetWithArray:left3];
NSMutableArray *arrLeft3 = [[orderedSet4 array] mutableCopy];
[leftTableData3 addObject:arrLeft3];
I am trying to create a dictionary (Not sure whether it should be NSDictionary or NSMutableDictionary) from NSString to an array (Not sure whether it should be NSArray or NSMutableArray).
property:
#property(nonatomic, readonly) NSMutableDictionary * categories;
implementation:
#synthesize categories = _categories;
- (NSMutableDictionary *)categories{
if(! _categories) {
for(PFObject * each in self.products) {
NSString * currentcategory = [each valueForKey:#"subtitle"];
NSArray * currentlist = [_categories objectForKey:currentcategory];
if(! currentlist) {
currentlist = [[NSArray alloc] init];
}
NSMutableArray * newArray = [currentlist mutableCopy];
[newArray addObject:each];
NSArray * newlist = [NSArray arrayWithArray:newArray];
[_categories setObject:newlist forKey:currentcategory];
}
}
NSLog(#"After constructor the value of the dictionary is %d", [_categories count]);
return _categories;
}
From the debug NSLog I realize that the dictionary is empty after the construction. What is wrong here and how shall I change it?
After code line
if(! _categories) {
add
_categories = [NSMutableDictionary new];
If you did not initialize _category array somewhere in code then.
you must instantiate it inside
if(!_categories)
Your NSMutableArray _categories instance is not allocated and initialized yet.
To create instance of NSMutableArray just add
_categories = [NSMutableArray arrayWithCapacity:0];
I want to know how to retrieve the values by giving input parameter to a function. I want to retrieve in this way here as below, but it doesn't retrieve it rather giving empty array value when printing. I can't use even ampersand like c in parameter.
NSMutableArray *firstArray = [[NSMutableArray alloc] init];
NSMutableArray *secondArray = [[NSMutableArray alloc] init];
MyClass *myClassObj = [[MyClass alloc] init];
[myClassObj getVals : firstArray : secondArray];
NSLog(#"firstArray: %#", firstArray); // empty
NSLog(#"secondArray: %#", secondArray); // empty
// function to retrieve
- (void) getVals :(NSMutableArray *) firstArray :(NSMutableArray *) secondArray
{
firstArray = [NSMutableArray arrayWithObjects:#"val1", #"val2", #"val3", #"val4", nil];
secondArray = [NSMutableArray arrayWithObjects:#"val11", #"val22", #"val33", #"val44", nil];
}
Try this:
- (void) getVals :(NSMutableArray *) firstArray :(NSMutableArray *) secondArray {
[firstArray addObjectsFromArray:#[ #"val1", #"val2", #"val3", #"val4" ]];
[secondArray addObjectsFromArray:#[ #"val11", #"val22", #"val33", #"val44" ]];
}
The code you have assigns a new array to the local parameter values instead of adding values to the passed in arrays.
Your other option could be:
NSMutableArray *firstArray = nil;
NSMutableArray *secondArray = nil;
MyClass *myClassObj = [[MyClass alloc] init];
[myClassObj getVals : &firstArray : &secondArray];
- (void) getVals :(NSMutableArray **) firstArray :(NSMutableArray **) secondArray {
*firstArray = [NSMutableArray arrayWithObjects:#"val1", #"val2", #"val3", #"val4", nil];
*secondArray = [NSMutableArray arrayWithObjects:#"val11", #"val22", #"val33", #"val44", nil];
}
You are overriding the object reference with new object. U should rather use
[firstArray addObject:#"val1"]