How to hide a bunch of labels in an IBOutletCollection?

Question

New to Objective-C and iOS development, would love a hand here!

I have written up some code such that

IBOutletCollection(UILabel) NSArray *allLabels;

In IB I have linked up all my labels in my view to this collection, where I want to hide them for a certain condition. However, I am not sure how to do so. Obviously to hide a single label I'd use

labelX.hidden = YES;

however it is not ideal for me to do this without a collection, as I have many labels to hide.

Thanks for your tips in advance!

score 10 · Accepted Answer · edited Mar 20 '19 at 09:39

10

try this...

[allLabels setValue:@(YES) forKey:@"hidden"];

edited Mar 20 '19 at 09:39

Iulian Onofrei

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answered May 28 '12 at 08:03

Ankit Srivastava

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@Vladimir which will be faster.. ? the one suggested by mit3z or by me.. ? just out of curiosity. – Ankit Srivastava May 28 '12 at 08:06
Made some quick tests, so no guarantee that they are adequate. Your method (tested on iPod touch with array of 50 labels) runs 0.0022 - 0.0029 sec, mit3z's method runs: 0.0015-0.002s so is a bit faster – Vladimir May 28 '12 at 08:26
@Vladimir would you say blocks are generally faster than methods..? is it that why it is happening? – Ankit Srivastava May 28 '12 at 08:29
Works perfectly. Thanks! However, what would I use in opposition of this - ie to re-show the labels? Thank you again! – Ben T May 28 '12 at 08:31
@BenToscano NO instead of YES. – Ankit Srivastava May 28 '12 at 08:31
@AnkitSrivastava, not sure why exactly it works slower. Possible reasons - time need to boxing/unboxing bool value to NSNumber, time to resolve actual selector for key name – Vladimir May 28 '12 at 08:33
Ah, I originally tried that and got an error but it was something else so it worked now. Thanks again for your time! – Ben T May 28 '12 at 08:35

score 2 · Answer 2 · answered May 28 '12 at 08:00

2

Just enumerate collection and do whatever you want with contents:

[allLabels enumerateIndexesUsingBlock:^(UILabel *label, NSUInteger idx, BOOL *stop) {
    label.hidden = YES;
}];

answered May 28 '12 at 08:00

ksh

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score 0 · Answer 3 · edited Sep 12 '16 at 21:30

0

Swift Version for Array type:

(allLabels as NSArray).setValue(NSNumber(bool: true), forKey: "hidden")

edited Sep 12 '16 at 21:30

nobody

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answered Sep 12 '16 at 20:55

TejAces

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`allLabels.forEach { $0.hidden = true }` would be more swifty – EmilioPelaez Sep 12 '16 at 21:32
Nice, @EmilioPelaez! You should create an answer if your implementation. ;) – Thomás Pereira Aug 25 '18 at 15:11

How to hide a bunch of labels in an IBOutletCollection?

3 Answers3