NSMutableArray and addObject - Sublist

NSMutableArray and addObject - Sublist - ios

How can I have sub lists using NSMutableArray and addObject:
Here is the current code:
categories = [[NSMutableArray alloc] init];
[categories addObject:#"Line 1"];
[categories addObject:#"Line 2"];
[categories addObject:#"Line 3"];
[categories addObject:#"Line 4"];
I would like to have sublisting like so:
Line 1
Line A
Line B
Line C
Line 2
Line A
Line B
Line C
...etc...
Let me know if this is possible and how. Thanks.

You're just adding strings to an array. If you want a list within a list, you have to create the sublist and then add it as an object within the main list
NSMutableArray *mainList = [NSMutableArray new];
NSArray *subList = #[#"thing 1",#"thing 2",#"thing 3"];
[mainList addObject:subList];
Then, if you want to access and individual subArray, you could do so like this:
NSArray *subList = mainList[0];
Or an individual sublist item:
NSString *item = mainList[0][1];
Which would be the second item in the first sublist.

You need to create an object, let's say MyObject, which contains a string and another Array
#interface MyObject
#property NSString *name;
#property NSMutableArray *items;
#end
and add MyObject objects to your categories array.

you can do it like this:
NSMutableArray *categories = [[NSMutableArray alloc] init];
NSArray *LineOne = #[#"Line A",#"Line B",#"Line C"];
NSArray *LineTwo = #[#"Line A",#"Line B",#"Line C"];
[categories addObject:LineOne];
[categories addObject:LineTwo];

Looks like NSMutableDictionary is your solution:
NSMutableDictionary * dict = [NSMutableDictionary new];
NSArray *line1list, *line2list, *line3list;
// init list arrays
[dict setObject:line1list forKey:#"Line 1"];
[dict setObject:line2list forKey:#"Line 2"];
[dict setObject:line3list forKey:#"Line 3"];

Related

Adding objects to instance variable array

Can someone help me out on this:
Im creating a property in my TableVC.m file :
#property NSMutableArray *savingBeaconSpecs;
In my Viewdidload I instantiate the array:
NSMutableArray *savingBeaconSpecs = [[NSMutableArray alloc]init];
Now I do requests to the server, and I want to save the returned JSON into objects and save these each time in the array. So I did the following in the ConnectionDidFinishLaunching:
self.artworkArray = [NSJSONSerialization JSONObjectWithData:self.data options:0 error:&err];
NSLog(#"Log ArtworkArray in ConnectionDidFinishLoading%#", self.artworkArray);
And:
Artwork *artwork = [[Artwork alloc]init];
artwork.title = [self.artworkArray valueForKey:#"name"];
artwork.artist = [[self.artworkArray objectForKey:#"artist"] valueForKey:#"name"];
artwork.CreationYear = [self.artworkArray valueForKey:#"creationYear"];
artwork.categorie = [[self.artworkArray objectForKey:#"exposition"] valueForKey:#"name"];
Now I want to save this object into the savingBeaconSpecs NSMutableArray
[self.savingBeaconSpecs addObject:artwork];
But the NSMUtableArray savingBeaconSpecs always returns 0 when i try log his content
Anyone please?

Because you declare it locally in your viewDidLoad :
NSMutableArray *savingBeaconSpecs = [[NSMutableArray alloc]init];
you should use
self.savingBeaconSpecs = [[NSMutableArray alloc]init];
and
[self.savingBeaconSpecs addObject:artwork];
and declare your property as (without the first capital S)
#property NSMutableArray *savingBeaconSpecs;

To instantiate the array, you should do:
self.savingBeaconSpecs = [[NSMutableArray alloc] init];
or equally good:
self.savingBeaconSpecs = [NSMutableArray array];

check for a key within an object within an array of objects [duplicate]

I have a NSArray of Contact objects, we can call it contacts. Contact is a superclass, FacebookGroup and Individual are subclasses of Contact. FacebookGroup has a property called individuals which is a set of Individual objects.
I also have a NSArray of NSString objects, we can call it userIDs.
What I want to do is create a new NSArray from the existing contacts array that match the userIDs in userIDs.
So if contacts has 3 Contact objects with userID 1,2 and 3. And my userIDs has a NSString object 3. Then I want the resulting array to contain Contact which equals userID 3.
Contact.h
Contact : NSObject
FacebookGroup.h
FacebookGroup : Contact
#property (nonatomic, strong) NSSet *individuals;
Individual.h
Individual : Contact
#property (nonatomic, strong) NSString *userID;

NSPredicate *predicate = [NSPredicate predicateWithFormat:#"userId = %#", myContact.userId];
NSArray *filteredArray = [contacts filteredArrayUsingPredicate:predicate];

Is this what you are looking for?
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"userID IN %#", userIDs];
NSArray *filtered = [contacts filteredArrayUsingPredicate:predicate];

i'm expecting you want like this once see this one,
NSMutableArray *names = [NSMutableArray arrayWithObjects:#"one", #"two", #"three", #"four", nil];
NSMutableArray *ids = [NSMutableArray arrayWithObjects:#"1", #"2", #"2", #"3", nil];
NSMutableArray *array=[[NSMutableArray alloc]init];
for(int i=0;i<[ids count];i++){
if([[ids objectAtIndex:i] isEqualToString:#"2"])
[array addObject:[names objectAtIndex:i]];
}
NSLog(#"%#",array);
O/P:-
(
two,
three
)

Retriving Array values from the NSMutableArray in IOS

I am working with an application in which i am getting photoID ,which is a string.
I am storing that photoID in array,and again add that array in another array.
Below iS the code::
NSString *photoID;
arr=[[NSMutableArray alloc]initWithCapacity:10];
array=[[NSMutableArray alloc] init];
[array addObject:photoID];
[arr arrayByAddingObjectsFromArray:array];
//number=(int)arr[1];
NSLog(#"arr : %#",arr);
NSLog(#"arr[0] : %#",arr[0]);
NSLog(#"arr[1] : %#",arr[1]);
NSLog(#"Number1 : %#",number1);
NSLog(#"Number : %d",number);
when i tried to access the value of arr[1],my application crashes.
i don't know what am i doing wrong.am i doing wrong to add strings in array,and truing to access unsaved data?
Please help me out.
Thanks in advance

It is because this line: [arr arrayByAddingObjectsFromArray:array]; does nothing to the arr, it only
Returns a new array that is a copy of the receiving array with the
objects contained in another array added to the end.
You should replace it with [arr addObjectsFromArray:array];. And also, you only have 1 element in arr which is at index 0, so the arr[1] should crash but arr[0] should work.

First array should be NSArray if you want to arrayByAddingObjectsFromArray or addObjectsFromArray
NSArray *array1=[[NSArray alloc]initWithObjects:#"1",#"2",#"3", nil];
NSMutableArray *array2=[[NSMutableArray alloc]init];
[array2 addObjectsFromArray:array1];
NSLog(#"%d",array2.count);
You can also use like this:
NSMutableArray *innerArray = [[NSMutableArray alloc] initWithObjects:#"1",#"2",#"3", nil];
NSMutableArray *outerArray = [NSMutableArray array];
for(int i=0;i<=innerArray.count;i++)
{
[outerArray addObject:innerArray];
}

How to initialize an empty mutable array in Objective C

I have a list of objects (trucks) with various attributes that populate a tableview. When you tap them they go to an individual truck page. There is an add button which will add them to the favorite list in another tableview. How do I initialize an empty mutable array in Cocoa?
I have the following code:
-(IBAction)addTruckToFavorites:(id)sender:(FavoritesViewController *)controller
{
[controller.listOfTrucks addObject: ((Truck_Tracker_AppAppDelegate *)[UIApplication sharedApplication].delegate).selectedTruck];
}

Update:
With new syntax you can use:
NSMutableArray *myArray = [NSMutableArray new];
Original answer:
for example:
NSMutableArray *myArray = [[NSMutableArray alloc] init];
And here you find out why (difference between class and instance method)

Basically, there are three options:
First
NSMutableArray *myMutableArray = [[NSMutableArray alloc] init];
Second
NSMutableArray *myMutableArray = [NSMutableArray new];
Third
NSMutableArray *myMutableArray = [NSMutableArray array];

You can also initialize in this way
Another way for Objective C apart from the answer of #NSSam
NSMutableArray *myMutableArray = [#[] mutableCopy];
For Swift
let myArray = NSMutableArray()
OR
let myArray = [].mutableCopy() as! NSMutableArray;

NSMutableArray *arr = [NSMutableArray array];

I use this way to initialize an empty mutable array in Objective C:
NSMutableArray * array = [NSMutableArray arrayWithCapacity:0];

listOfTrucks = [NSMutableArray array]; gives you a new mutable array.

In modern Objective - C it could be even more shorter:
NSArray *array = #[];

How to create NSDictionary inside NSArray and How to access them in ios

I am new to iOS and want to create an NSArray like this which contains an NSDictionary.
[
{
Image: 1, 2,3
Title: 1,2,3
Subtitle:1,2,3
}
]
I have tried this.
NSArray *obj-image=#[#"Test.png",#"Test.png",#"Test.png"];
NSArray *obj-title=#[#"Test",#"Test",#"Test"];
NSArray *obj-subtitle=#[#"Test",#"Test",#"Test"];
NSDictionary * obj_dictionary ={ image : obj_image, title:obj_title, subtitle:obj_subtitle}
NSArray * obj_array= [obj_dictionarry];
But not working and how to access them.

First of all, you initialization of Arrays and Dictionaries is wrong. You cannot use "-" in the names, period.
Second, you need to allocate and then initialize the objects. This is how you do that with arrays:
NSArray *images = [NSArray arrayWithObjects: #"TestImage",#"TestImage",#"TestImage",nil];
NSArray *titles = [NSArray arrayWithObjects: #"TestTitle",#"TestTitle",#"TestTitle",nil];
NSArray *subtitles = [NSArray arrayWithObjects: #"TestSubTitle",#"TestSubTitle",#"TestSubTitle",nil];
Then you need Mutable dictionary and mutable arrays to work with the data (mutable means you can change the values inside, add or remove objects etc.)
This is the most basic example of what you are trying to achieve:
NSArray *images = [NSArray arrayWithObjects: #"TestImage",#"TestImage",#"TestImage",nil];
NSArray *titles = [NSArray arrayWithObjects: #"TestTitle",#"TestTitle",#"TestTitle",nil];
NSArray *subtitles = [NSArray arrayWithObjects: #"TestSubTitle",#"TestSubTitle",#"TestSubTitle",nil];
NSMutableArray *objectsMutable = [[NSMutableArray alloc] init];
for (NSString *string in images) {
NSMutableDictionary *dictMutable = [[NSMutableDictionary alloc] init];
[dictMutable setObject:string forKey:#"image"];
//determining the index of the image
NSInteger stringIndex = [images indexOfObject:string];
[dictMutable setObject:[titles objectAtIndex:stringIndex] forKey:#"title"];
[dictMutable setObject:[subtitles objectAtIndex:stringIndex] forKey:#"subtitle"];
NSDictionary *dict = [[NSDictionary alloc] init];
dict = dictMutable;
[objectsMutable addObject:dict];
}
NSArray *objects = objectsMutable;
NSLog(#"%#", objects);
Hope this helps.
As you can see, I'm going through the images array, capturing the index of each one, an then just apply values of other arrays from the same index into a mutable dictionary.
All I do after that is just make a regular dictionary and array to put the data inside. This is ho the Log will look:
(
{
image = TestImage;
subtitle = TestSubTitle;
title = TestTitle;
},
{
image = TestImage;
subtitle = TestSubTitle;
title = TestTitle;
},
{
image = TestImage;
subtitle = TestSubTitle;
title = TestTitle;
}
)
You have an array with three objects inside, each with their own image, title and subtitle.

Here is code :
NSMutableArray *array = [[NSMutableArray alloc] init];
NSMutableDictionary *mdict = [[NSMutableDictionary alloc] initWithObjectsAndKeys:#"object1",#"key1",#"object2",#"key2",nil];
[array addObject:mDict];
so now if u need to access dictionary from array then :
NSMutableDictionary *mDict1 = [array objectatindex:0];
NSLog(#"%#",[mDict1 valueForkey:#"key1"];
--> print object 1.

This is the way to store array of dictionaries:
NSDictionary *dic=#{#"kishore":#"hai"};
NSMutableArray *arr=[[NSMutableArray alloc]init];
[arr addobject:dic];
this is the way to get those values:
[arr objectforkeyValue #"kishore"];

NSMutableArray *dictArray = [[NSMutableArray alloc] init]; // created and initiated mutable array
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init]; // created and initiated mutable Dictionary
[dict setObject:#"object1" forKey:#"1"]; // added a key pair in dictionary (you can set multiple objects)
[dictArray addObject:dict]; // added dictionary to array (you can add multiple dictionary to array )
NSLog(#"dictionary inside an array : %#",dictArray[0][#"1"]); // access dictionary from array

You can try something like this
[NSArray arrayWithObjects:#{#"Image":#[#1,#2,#3]},#{#"Title":#[#1,#2,#3]},#{#"SubTitle":#[#1,#2,#3]}, nil];

You can easily create objects of array and access them back using following way.
NSArray *objimage=#[#"Test1.png",#"Test2.png",#"Test3.png"];
NSArray *objtitle=#[#"Test1",#"Test2",#"Test3"];
NSArray *objsubtitle=#[#"Test1",#"Test2",#"Test3"];
NSDictionary *obj_dictionary = #{#"image":objimage,#"Title":objtitle, #"subtitle":objsubtitle};
NSArray * obj_array= [[NSArray alloc] initWithObjects:obj_dictionary, nil]; // Create Array of nested objects
if([obj_array count] > 0) {
NSArray * imageArray = obj_array[0][#"image"]; // Access the nested objects in Array.
NSLog(#"%#", imageArray[0]);
}

first of all u need to declare correct variable name
NSArray *objImage=#[#"Test.png",#"Test.png",#"Test.png"];
NSArray *objTitle=#[#"Test",#"Test",#"Test"];
NSArray *objSubtitle=#[#"Test",#"Test",#"Test"];
at this point all u are created all the array, and u need to create dictionary like below
NSDictionary *obj_dictionary = #{#"image":objImage,#"title":objTitle, #"subtitle":objSubtitle};
// NSArray * obj_array = obj_dictionary[#"image"];
NSArray * obj_array = #[obj_dictionary]; //u can crate array of dictionary like this
in above obj_dictionary will contains all the array like below,
Title = (
Test,
Test,
Test
);
image = (
"Test.png",
"Test.png",
"Test.png"
);
subtitle = (
Test,
Test,
Test
);
and u can access the object in the dictionary like below using a key for example
NSArray * obj_array_images = obj_dictionary[#"image"];
gives an array of images that is associated with key image, similarly u can access other array like this by providing different keys associated with the dictionary obj_dictionary for example
NSArray * obj_array_titles = obj_dictionary[#"title"];
NSArray * obj_array_subtitles = obj_dictionary[#"subtitle"];
edit
NSArray *objImage=#[#"Test.png",#"Test.png",#"Test.png"];
NSArray *objTitle=#[#"Test",#"Test",#"Test"];
NSArray *objSubtitle=#[#"Test",#"Test",#"Test"];
NSDictionary *obj_dictionary = #{#"image":objImage,#"title":objTitle, #"subtitle":objSubtitle};
// NSArray * obj_array = obj_dictionary[#"image"];
NSArray * obj_array = #[obj_dictionary]; //u can crate array of dictionary like this

Develop Reference

ios ruby-on-rails asp.net-mvc docker delphi jenkins grails google-sheets machine-learning dart

NSMutableArray and addObject - Sublist - ios

You need to create an object, let's say MyObject, which contains a string and another Array #interface MyObject #property NSString name; #property NSMutableArray items; #end and add MyObject objects to your categories array.

you can do it like this: NSMutableArray categories = [[NSMutableArray alloc] init]; NSArray LineOne = #[#"Line A",#"Line B",#"Line C"]; NSArray *LineTwo = #[#"Line A",#"Line B",#"Line C"]; [categories addObject:LineOne]; [categories addObject:LineTwo];

Related

Adding objects to instance variable array

check for a key within an object within an array of objects [duplicate]

Retriving Array values from the NSMutableArray in IOS

How to initialize an empty mutable array in Objective C

How to create NSDictionary inside NSArray and How to access them in ios

Categories

Resources

Develop Reference

ios ruby-on-rails asp.net-mvc docker delphi jenkins grails google-sheets machine-learning dart

NSMutableArray and addObject - Sublist - ios

You need to create an object, let's say MyObject, which contains a string and another Array #interface MyObject #property NSString *name; #property NSMutableArray *items; #end and add MyObject objects to your categories array.

you can do it like this: NSMutableArray *categories = [[NSMutableArray alloc] init]; NSArray *LineOne = #[#"Line A",#"Line B",#"Line C"]; NSArray *LineTwo = #[#"Line A",#"Line B",#"Line C"]; [categories addObject:LineOne]; [categories addObject:LineTwo];

Related

Adding objects to instance variable array

check for a key within an object within an array of objects [duplicate]

Retriving Array values from the NSMutableArray in IOS

How to initialize an empty mutable array in Objective C

How to create NSDictionary inside NSArray and How to access them in ios

Categories

Resources

You need to create an object, let's say MyObject, which contains a string and another Array #interface MyObject #property NSString name; #property NSMutableArray items; #end and add MyObject objects to your categories array.

you can do it like this: NSMutableArray categories = [[NSMutableArray alloc] init]; NSArray LineOne = #[#"Line A",#"Line B",#"Line C"]; NSArray *LineTwo = #[#"Line A",#"Line B",#"Line C"]; [categories addObject:LineOne]; [categories addObject:LineTwo];