iOS Dynamically naming a UITextfield

tazboy · Apr 7, 2010

I need to know how to dynamically make UITextfields. I want to make a bunch of textfields and have them each have a different name. This is almost what I need:

Code:

UITextfield *textfield[B]+[i][/B] = [[UITextField alloc] initWithFrame:CGRectMake(x,y,30,25)];

The bold part, +, is what I need to make happen. I've been searching for hours and I haven't found a solution.

Any help would be greatly appreciated.

dejo · Apr 7, 2010

Forget about giving them different names. That's only what you might use to access their pointers anyways. You're probably better off creating them in a loop and adding them to a (mutable) array as you go. Something like this:

Code:

	NSMutableArray *textfields = [NSMutableArray array];
	for (int i = 0; i < numTextfields; i++) {
		UITextField *field = [[UITextField alloc] initWithFrame:...];
		[textfields addObject:field];
	}

P.S. I've left out any memory-management you'll probably want to do as well.

tazboy · Apr 7, 2010

dejo said:

Code:

	NSMutableArray *textfields = [NSMutableArray array];
	for (int i = 0; i < numTextfields; i++) {
		UITextField *field = [[UITextField alloc] initWithFrame:...];
		[textfields addObject:field];
	}

If I go this route, then would I change the .text value of one of the fields by doing something like this?

Code:

textfields[0].text = @"hello";

Thanks for the assistance.

robbieduncan · Apr 7, 2010

tazboy said:
If I go this route, then would I change the .text value of one of the fields by doing something like this?

Yes.

dejo · Apr 7, 2010

tazboy said:
If I go this route, then would I change the .text value of one of the fields by doing something like this?

Code:

textfields[0].text = @"hello";

Something like that. (That exactly will give you a "'struct NSMutableArray' has no member named text" error). Remember textfields in a NSMutableArray (which is a subclass of NSArray), so you can't use [n] notation to access its objects. The instance method objectAtIndex: is what you want to use. And there's more you'll need to do to use the setter for the text property.

tazboy · Apr 7, 2010

Here is what I've tried, along with some other variations, but I can't get it to work.

Code:

NSMutableArray *scoreFields, *totalFields, *nameFields;
@property (nonatomic, retain) NSMutableArray *scoreFields, *totalFields, *nameFields;
@synthesize scoreFields, totalFields, nameFields;

I make the scoreFields array. I fill it with UITextFields.

Code:

- (void) makeScoreField:(int)i {
UITextField *field = [[UITextField alloc] initWithFrame:CGRectMake(10,(i*35)+25,30,25)];
[self.view addSubview:field];
[scoreFields addObject:field];
[field release];
}

I'm trying to take 2 user inputted values from UITextFields that are in the scoreFields array. I get the values and make them integers and then add them up. I then make their sum an NSString and put it's value into another UITextField that is stored in the totalFields array.

Code:

UITextField *score1, *score2, *scoreTotal;
NSInteger sumTotal;	
score1 = [scoreFields objectAtIndex:0];
score2 = [scoreFields objectAtIndex:1];
sumTotal = [score1.text integerValue] + [score2.text integerValue];
scoreTotal = [totalFields objectAtIndex:0];
scoreTotal.text = [NSString stringWithFormat:@"%d", sumTotal];

Apparently, my logic does not match the code. I don't think the array's objects are the UITextField objects on the screen. I'm just not getting something.

Any ideas would be appreciated.

robbieduncan · Apr 8, 2010

So, somewhere, you're creating the NSMutableArrays right? Declaring the properties just allocates a space to store a pointer in, not the array itself...

tazboy · Apr 8, 2010

robbieduncan said:
So, somewhere, you're creating the NSMutableArrays right? Declaring the properties just allocates a space to store a pointer in, not the array itself...

Darn rookies can't even remember to alloc and init an array. Thanks man.

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iOS Dynamically naming a UITextfield

tazboy

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dejo

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tazboy

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robbieduncan

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dejo

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tazboy

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robbieduncan

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tazboy

macrumors newbie

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