Save UISwitch's Current State

[DevinSnipes]

Is it possible to save the state of a UISwitch as soon as the user changes the switches state? I have it where when the user closes the application, the NSUserDefaults synchronize with the application. If anyone has the code, please, please help me out! Thanks and I'll greatly appreciate it!

[smithdale87]

So you're looking for some sort of event that gets fired when the value of the UISwitch changes? That way you can save the value using NSUserDefaults?

[DevinSnipes]

Originally Posted by smithdale87

So you're looking for some sort of event that gets fired when the value of the UISwitch changes? That way you can save the value using NSUserDefaults?

Exactly what I'm looking for. Like I said, I have the NSUserDefaults to synchronize when the application terminates.

[Johanovski]

Hi Devin!

Well, I haven't worked with UISwitch at all so I don't know exactly how it works, but I think it shouldn't be a problem... You should have a listener to detect when the user changes a UISwitch's state, and a UISwitch have a property called "on" which is a boolean that simply determines if the switch is turned on or not. If the listener exists you simply should save this property's state in a variable so you can store it and save it in your NSUserDefaults (in fact I think you may save the property itself so you don't even need to store it in a variable). What happens if you don't have a listener (as I've said I don't know because I've never worked with UISwitches)? Well, you should then be aware on when the user can change the switch state... Let me explain with some pseudo-code examples:

If the UISwitch have it's own listener:

-(void)switchHaveChangedItsState:(UISwitch*)switch   // of course if the method exists it will not be called like this ;)
{
     self.myBool = switch.on;
}

What if the UISwitch doesn't have a listener (the following it's just an idea, but sure it can be solved in many ways)?

// In your touch method:
-(void)touchesBegan(...)
{
     self.switchState = self.mySwitch.on; // save your switch's state...
}

-(void)touchesEnded(...)
{
     if( self.switchState != self.mySwitch.on )
     {
          // If yes means that since the user touched the screen the switch's value have changed, so it means that the user changed it!
          // Here you can save it to NSUserDefaults...
          // To save it you simply should copy your NSUserDefault's code here (I've never used NSUserDefaults, I use to save my data in an own-made plist file)
     }
}

Well I think it is more or less what you're looking for (or what I've understood, but here are 9.00 am so I'm not even awaken ^_^), if you have any other doubt or this isn't exactly what are you looking for ask me and if I can I will help you!

Regards!