CODEWITHSUNDEEP
iosuiswitch
brianhevans
brianhevans

Reputation: 1193

Handling multiple UISwitches with a single IBAction method

I have the following IBAction that is linked to several switch in my application. I would like to figure out which switch is clicked. Each UISwitch has a specific name. I want that name.

- (IBAction)valueChanged:(UISwitch *)theSwitch { //Get name of switch and do something... }

Upvotes: 1

Views: 717

Answers (4)

Simon Germain
Simon Germain

Reputation: 6844

The IBAction passes a pointer to the switch that performed the action. You can get any property off of it.

To compare switches:

- (void)valueChanged:(UISwitch *)theSwitch {

    if ([theSwitch isEqual:self.switch1]) {
        NSLog(@"The first switch was toggled!");
    }
    else if ([theSwitch isEqual:self.switch2]) {
        NSLog(@"The second switch was toggled!");
    }
    else {
        NSLog(@"Some other switch was toggled!");
    }
}

Upvotes: 2

progrmr
progrmr

Reputation: 77291

UISwitch doesn't have a name property. But you can subclass it and add a name property to the subclass. Then create switches from the subclass instead of UISwitch and give them a name when you init them. 

@class MySwitch : UISwitch
@property (nonatomic, retain) NSString* name;
@end

Then the event handler can access them name string:

- (IBAction)valueChanged:(MySwitch *)theSwitch { 
    NSLog(@"switch %@ value changed", theSwitch.name);
}

But I think the better answer is to use the tag field already there and use integer tags to identify the switches rather than a string. You can create enumeration constants in your code to name the tag values:

enum { SomeSwitch = 1, AnotherSwitch = 2, MainSwitch = 3 } _SwitchTags;

The best answer is the one @Moxy mentioned to compare the switch's pointer to your controller's properties to figure out which switch changed. That's what I do in my code. Tags and names are too error prone in the long run.

Upvotes: 0

Moxy
Moxy

Reputation: 4212

You can either use tags:

When you create the switches you need to set their tags.

- (IBAction)valueChanged:(UISwitch *)theSwitch { 
    switch(theSwitch.tag){
        case 0:
        {
            //things to be done when the switch with tag 0 changes value
        }
        break;
        case 1:
        {
            //things to be done when the switch with tag 0 changes value
        }
        break;
        // ...
        default:
        break;
    }
}

Or check if the switch is one of your controller properties

- (IBAction)valueChanged:(UISwitch *)theSwitch { 
    if(theSwitch == self.switch1){
        //things to be done when the switch1 changes value
    } else if (theSwitch == self.switch2) {
        //things to be done when the switch2 changes value
    }// test all the cases you have
}

Upvotes: 2

Allen
Allen

Reputation: 472

I don't thank you can get the name of that switch. You could tag each of the switches, and use that tag to determine the name of the switch.

Upvotes: 0

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