CODEWITHSUNDEEP
iosobjective-c
bardockyo
bardockyo

Reputation: 1435

iOS: setting buttons pressed state

I am trying to find the best approach to doing this. I have 5 custom buttons on a view controller and I am trying to have the button stay highlighted if it is clicked. I know how to do this but I am trying to only allow 1 button to be highlighted at a time. So if a user clicks a button and highlights it, but clicks another, then the most recent button clicked will stay highlighted and the previous will unhighlight. What would be the best way to accomplish this?

Upvotes: 1

Views: 6002

Answers (2)

rdurand
rdurand

Reputation: 7410

You should keep a reference to all your buttons (for example, if you use IB, have links in your code like @property (nonatomic, strong) IBOutlet UIButton *button1; for all your buttons).

Then link all your buttons to the same method for a press on the button. I'll call it buttonPressed.

Impement it like this :

- (IBAction)buttonPressed:(id)sender {

    UIButton *buttonPressed = (UIButton*)sender;
    NSArray *buttons = [NSArray arrayWithObjects:_button1, _button2, _button3, nil];
    bool buttonIsHighlighted = NO;

    // Check if a button is already highlighted
    for (UIButton *button in buttons) {

        if (button.highlighted) {

            buttonIsHighlighted = YES;
        }
    }

    // If a button is highlighted, un-highlight all except the one pressed
    // If no button is highlighted, just highlight the right one
    if (buttonIsHighlighted) {

        for (UIButton *button in buttons) {

            if (buttonPressed == button) {

                buttonIsHighlighted = YES;

            } else {

                button.highlighted = NO;
            }
        }

    } else {

        buttonPressed.highlighted = YES;
    }
}

I can't test this code but I'm pretty sure it should work. Let me know if something's wrong.

Upvotes: 3

Andrea Mario Lufino
Andrea Mario Lufino

Reputation: 7921

Solution 1: Put your buttons in an NSArray and when user clicks on a button check if another is highlighted. If YES, unhighlight it and highlight the one was pressed. If NO, highlight directly the one pressed.

Solution 2: You can save the highlighted button in a global variable declared in @interface or in a @property. When users click the new one unhighlight the previous.

Upvotes: 0

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