CODEWITHSUNDEEP
iphonexcodebooleanuiswitch
Ktmock13
Ktmock13

Reputation: 143

iPhone UISwitch react with another UISwitch

I've read all about UISwitches already but I cannot seem to figure them out in my situation. I have 2 UISwitches. In order for my code to work only one of them can be ON. How would I accomplish this?

So far i've tried...

MyClass.h

-(IBAction)sufSwitchChanged:(id)sender;

MyClass.m

-(IBAction)preSwitchChanged:(id)sender {
UISwitch *whichSwitch = (UISwitch *)sender;
BOOL setting = whichSwitch.isOn;
[newsPre setOn:setting animated:YES];
[techPre setOn:setting animated:YES];
}

....which worked but it made both switches ON or OFF. I just need to figure out how to prevent them from both being ON at the same time.

Upvotes: 1

Views: 1871

Answers (2)

Damian Carrillo
Damian Carrillo

Reputation: 1218

Register both UISwitches to observe UIControlEventValueChanged notifications against the the other switch. Something like:

- (void)viewDidLoad { // or whatever method is appropriate
    UISwitch *a = <# initialize a #>;
    UISwitch *b = <# initialize b #>;

    [a addTarget:self action:@selector(toggleB:)   
         forControlEvents:UIControlEventValueChanged]; 

    [b addTarget:self action:@selector(toggleA:)   
         forControlEvents:UIControlEventValueChanged]; 
}

- (IBAction)toggleA:(id)sender {
    [b setOn:NO animated:YES];
}

- (IBAction)toggleB:(id)sender {
    [a setOn:NO animated:YES];
}

You can also set this relationship up in Interface Builder.

Upvotes: 3

Moshe
Moshe

Reputation: 58067

Notice how you are setting both switches to the same value here:

[newsPre setOn:setting animated:YES];
[techPre setOn:setting animated:YES];

You want to check which one is the sender and then set the other one to the opposite of setting. To do so, you will need to set a tag on each switch, or perhaps subclass it. For more information on detecting which switch is which, see this post, which has some good information.

Upvotes: 0

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