如何将布尔值存储到NSArray？

Question

So I'm storing user settings in a plist file and to do that I'm adding data to an NSArray. This approach is working for me.

My problem is that now I'm adding a UISwitch to the settings and I was wondering how to store their ON/OFF state to the array so that I can access that state at a later time?

I'm adding data to the array like this:

[array addObject: mySwitch.on];

Then I'm trying to set the state like this:

[mySwitch setOn:[array objectAtIndex:0]];

Answer 1

Since NSArray only takes in (id) s (ie Objective-C pointers to objects), you can only store objects.

The common way to store a BOOL value in an object is with the NSNumber class:

[array addObject:[NSNumber numberWithBool:mySwitch.on]];

To access it, grab that NSNumber object and send it a boolValue message:

[mySwitch setOn:[[array objectAtIndex:0] boolValue]];