CODEWITHSUNDEEP
iphonesdkuilabel
simonbs
simonbs

Reputation: 8042

UILabel created programmatically - find it again?

In viewDidLoad I have created 26 UILabels programmatically (one for each letter in the alphabet) and I have put the letters from the alphabet into each label (A in the first, B in the second...).

Later I would like to find one specific label (say, the label containing the letter "F"). I know both the letter I want to find and its index in the alphabet (so for F, I know that its index is 5 because F is the 6th letter in the alphabet)

How can I find this label?

Of course, I can make 26 IBOutlets and refer to them but this seems such a hassle.

This is how I create the labels:

// set letters
letters = [[NSArray alloc] initWithObjects:@"A", @"B", @"C", @"D", @"E", @"F", @"G", @"H", @"I", @"J", @"K", @"L", @"M", @"N", @"O", @"P", @"Q", @"R", @"S", @"T", @"U", @"V", @"W", @"X", @"Y", @"Z", nil];

int positionX = 0;
int positionY = 0;
for(int i = 0; i < [letters count]; i++) {
    /* a lot of positioning stuff is here (positionX and positionY is set. I have removed this to make the code look cleaner */ 

    UILabel *letterLabel = [[UILabel alloc] initWithFrame:CGRectMake(positionX, positionY, 50, 50)];
    letterLabel.text = [letters objectAtIndex:i];
    letterLabel.backgroundColor = [UIColor clearColor];
    letterLabel.font = [UIFont fontWithName:@"Helvetica" size:45];
    letterLabel.textAlignment = UITextAlignmentCenter;
    [self.view addSubview:letterLabel];
    [letterLabel release];
}

Upvotes: 1

Views: 2770

Answers (3)

mharper
mharper

Reputation: 3272

I probably would've created an NSMutableDictionary with an NSString containing the letter as the key and the associated UILabel as the object.

Upvotes: 1

filipe
filipe

Reputation: 3380

Two approaches I can think of:

  1. Add all your labels to an NSArray;

  2. Set the tag property for all the labels with a specific know value for each label and access them with [self.view viewWithTag:TheTagForTheLabel];

Upvotes: 4

Jeff Kelley
Jeff Kelley

Reputation: 19071

There are two basic ways to do this:

1. Create An Array

Simply make an NSMutableArray as an ivar in your view controller, then add the labels as they’re created. To find F, use [myArray objectAtIndex:5].

2. Use Tags

When you create the label, set its tag ([letterLabel setTag:i]). Then, when you want to retrieve it, use [[self view] viewWithTag:5].

Upvotes: 7

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