CODEWITHSUNDEEP
iosobjective-ccocoa-touch
JSA986
JSA986

Reputation: 5936

Perform same action for many objects

If I have 100 UITextFields,

myTextfFeld1, myTextField2...and so on until mytextField100

...and they all perform the same action, say change myTextField1.alpha = 0.4 to myTextField1.alpha = 1.

Rather than write this out 100 times is there a more efficient way of doing this

I had a look here iOS looping over an object's properties and adding actions but it still means adding all the UITextFields into the array.

Upvotes: 1

Views: 150

Answers (3)

user2369405
user2369405

Reputation: 217

Use a loop and an array for the textfields. e.g.

int i = 0
do textfield[i].alpha = 1
i = i+1
until i = 100

Upvotes: -2

Wain
Wain

Reputation: 119031

You can define an outlet collection and connect all of the textfields to it from the XIB:

 @property (nonatomic, weak) IBOutletCollection(UITextField) NSArray *textFields;

Then you can loop over the textFields array.

Upvotes: 1

user529758
user529758

Reputation:

Please, no!

Like this.

Use an array, seriously. Don't you dare having 100 instance variables named textField1 to textField100!

Just in order to actually answer your question: you still can do this. Again, I strongly discourage doing it, but just for completeness' sake, here's the code:

for (int i = 1; i <= 100; i++) {
    NSString *ivarName = [NSString stringWithFormat:@"myTextField%d", i];
    UITextField *tf = [self valueForKey:ivarName];
    [tf doWhateverYouWant];
}

Reflection in Objective-C is awesome, isn't it? Not quite when abused.

Upvotes: 6

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