CODEWITHSUNDEEP
objective-cuibuttonnsmutablearray
William Louis Roach-Barrette
William Louis Roach-Barrette

Reputation: 1

How to bind a buttons title to a particular value in an array IOS?

I have six on-screen buttons whose titles need to correspond to six elements in an NSMutableArray, when the value in the array changes, I also need the title to change with it. I am having trouble figuring out how to create that constantly updating line to the button, I'm still quiet new to objective-c development as well as Xcode.

I also need to make sure that when there is no value at that particular index of the array, the button cannot be clicked on

here is an example of one of the buttons

- (IBAction)card1Pressed:(id)sender {
    if (self.userHasEnteredFirstNumber) { 
        if (!self.userHasEnteredSecondNumber) {
            self.secondNumber = [sender currentTitle];
        }
    }
    else{
        self.firstNumber = [sender currentTitle];
    }

}

The end goal is to have the user press two buttons, then chose weather to add, subtract, multiply, or divide them. After they pick one of those four operations, the values that the buttons were assigned to in the array will be removed and replaced with whatever the new number is. So after they do this once there will only be 5 numbers left in the array, then 4, then 3..... and so on.

The numbers will be drawn and added to an NSMutable array titled currentHand

UPDATE: Using UIOutletCollection I linked the buttons to the method like this the link to the picture is here "sorry about not being able to directly post it but new users must have a reputation of 10 before they can" link to photo of declaration and implementation with interface-builder of IBOutletCollection

was this correct?

the code for the header file regarding the IBOutletCollection is as follows "please note that this has been connected to the six buttons I want to use it with in interface builder, a picture of it is shown above"

@property (nonatomic,retain) IBOutletCollection (UIButton)NSArray *buttonArray;

the code in the implementation file regarding the IBOutletController is as follows

@ synthesize buttonArray = _buttonArray;

Upvotes: 0

Views: 732

Answers (2)

ATaylor
ATaylor

Reputation: 2598

Okay okay, so essentially you have a 'Button'-Array, whose 'Caption' is served by a NSMutableArray, which can easily be changed around, correct?

Now, this is only how I'd do it, there may be better solutions out there, but here goes:

You need a 'change' interface, which is called EACH time, something happens to your NSMutableArray. For example (since I don't know WHAT exactly is in that array of yours): 

- (void) ChangeArray:(int)IDofElement (NSString *)newValue {
     [arr replaceObjectAtIndex:IDofElement withObject:newValue]; //Updates/Empties the indexed Element.
     if(newValue != nil) {   
         [buttons[IDOfElement] setText:newValue];
     }
     buttons[IDOfElement].enabled = (newValue != nil);      //Makes Button 'clickable'
}

Like this, each time the value inside that array of yours gets changed, the corresponding caption also gets updated. Of course you would need an array of the buttons for this to work, but I don't think that's the big problem.

Another possible solution: Save a reference to the button inside of the object that's stored in the array and whenever the value is changed, change the button's caption too.

Does this help? Mind you, this is not the 'perfect solution', but something I'd come up with.

Please also note, that this is just from the top of my head and probably faulty at some points. But it should be able to point you in the general direction.

Upvotes: 0

Daniel
Daniel

Reputation: 23359

You want to use Key-Value observing, check out this from the Apple documentation: https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/KeyValueObserving/KeyValueObserving.html#//apple_ref/doc/uid/10000177i

Upvotes: 2

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