CODEWITHSUNDEEP
iosobjective-cnsmutablearraynsarray
motox
motox

Reputation: 759

How to dynamically create a number of NSMutableArray(s)?

On touch up inside of SAVE button, the following code is executed:

- (IBAction)onSave:(id)sender {

    savecount++;
    [self saveNumberOfContacts];

    NSMutableArray *myArray = [[NSMutableArray alloc] init];
    [myArray addObject:nameTextField.text];
    [myArray addObject:phoneTextField.text];
    [myArray addObject:addressTextField.text];
    [myArray addObject:cityTextField.text];
    [myArray addObject:stateTextField.text];
    [myArray addObject:zipcodeTextField.text];

    [myArray writeToFile:[self saveFilePath] atomically:YES];
}

This creates a single array. I want to know how to dynamically create multiple arrays with the savecount variable suffixed at end of the array name.

For example, if my savecount is 3, then myArray1, myArray2, myArray3 should be created.

P.S. savecount changes its value dynamically.

EDIT: i dont want this method creating a number of arrays every time i call it. See, the user's info is stored in myArray1 when i click save for the first time. Now, the savecount gets increemented(say,savecount=2). When i enter another user's details and click save, i dont want myArray1 to be overwritten or disturbed; the second user's details must be independently saved in myArray2.

Upvotes: 0

Views: 1026

Answers (3)

simalone
simalone

Reputation: 2768

I think your problem is the path of save, or same path with appended array data.

If save data to different path:

- (NSString*)saveFilePath{
    return [NSString stringWithFormat:@"%@/%@%d.%@", thePathToSave, fileName, savecount, fileType];
}

If save to same path with appended array data:

Replace:

[myArray writeToFile:[self saveFilePath] atomically:YES];

with

NSArray *fileData = [NSArray arrayWithContentsOfFile:[self saveFilePath]];
NSMutableArray *preDatas = nil;
if (preDatas.count == 0) {
    preDatas = [NSMutableArray array];
}
else{
    preDatas = [NSMutableArray arrayWithArray:fileData];
}
[preDatas addObject:myArray];
[preDatas writeToFile:[self saveFilePath] atomically:YES];

Upvotes: 0

bneely
bneely

Reputation: 9093

If you are only using these arrays within one method, you could instead store the arrays in an array. This doesn't give you array names such as myArray1, myArray2, etc, but accomplishes the same overall task. Here's an example:

NSMutableArray *myArrays = [[NSMutableArray alloc] initWithCapacity:savecount];
for (NSUInteger i = 0; i < savecount; i++) {
    NSMutableArray *newArray = [[NSMutableArray alloc] init];
    [myArrays addObject:newArray];
    [newArray addObject:nameTextField.text];
    // continue adding your objects to newArray
}

Now you can reference your arrays as [myArrays objectAtIndex:0]...[myArrays objectAtIndex:savecount-1].

Upvotes: 1

βhargavḯ
βhargavḯ

Reputation: 9836

NSMutableArray *holder;

- (void)viewDidLoad
{
    holder = [[NSMutableArray alloc] init];
}
- (IBAction)onSave:(id)sender {

    savecount++;
    [self saveNumberOfContacts];

    NSMutableArray *myArray = [[NSMutableArray alloc] init];
    [myArray addObject:nameTextField.text];
    [myArray addObject:phoneTextField.text];
    [myArray addObject:addressTextField.text];
    [myArray addObject:cityTextField.text];
    [myArray addObject:stateTextField.text];
    [myArray addObject:zipcodeTextField.text];

    [myArray writeToFile:[self saveFilePath] atomically:YES];

    [holder addObject:myArray];
}

Have one global array in which you can hold dynamically created array. Now when you get value from holder, you will have separated myArray object.

Upvotes: 2

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