How To Connect NSUserDefaults To UISwitch? - iphone

Question

So I have setup my settings bundle which works in the iPhone's settings app. I want to add one of the settings within my own app. I know I can use InAppSettings framework, but I just want to add one settings, not all of them, and I already have an page ready that I want to add this settings option to.
So I have replicated the cell with UISwitch in my app which looks the same as the settings one. My question is, how can I now connect this UISwitch to my NSUserDefaults so it functions as a settings UISwitch?
In my appDelegate, I have:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSDictionary *appDefaults = [NSDictionary dictionaryWithObject:#"No" forKey:#"isKgs"];
[defaults registerDefaults:appDefaults];
[defaults synchronize];
Edit - All related code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:NO forKey: #"isKgs"];
[defaults synchronize];
}
The cell inside the app where I want the UISwitch to be
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UISwitch *switchView = [[UISwitch alloc] initWithFrame:CGRectZero];
cell.accessoryView = switchView;
[switchView addTarget:self action:#selector(switchChanged:) forControlEvents:UIControlEventValueChanged];
[switchView setOn:[[NSUserDefaults standardUserDefaults] boolForKey:#"isKgs"] animated:NO];
[switchView release];
}
And the settings bundle where I have the same UISwitch that can be acceded through iPhone settings app:
Edit 2:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (nil == [defaults objectForKey:#"isKgs"])
{
[defaults setBool:NO forKey: #"isKgs"];
}
else
{
}
[defaults synchronize];

Answer 1

It's easier to use a boolean variable if you want to use a UISwitch. In the app delegate, set the default value for the settings, if not existed:
// set the default settings
NSString *testValue = [[NSUserDefaults standardUserDefaults] stringForKey:#"testSwitch"];
if (!testValue) {
// since no default values have been set, create them here
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"testSwitch"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
And then create use the value from the NSUserDefaults settings to turn on the switch if needed:
UISwitch* testSwitch = [[[UISwitch alloc] init] autorelease];
if ([[NSUserDefaults standardUserDefaults] boolForKey:#"testSwitch"]) {
[testSwitch setOn:YES animated:NO];
}

Answer 2

You should head aporat's suggestion and use a BOOL instead. However, if you are insistent on using a string as in your question, then you will have to do this:
if ([[[NSUserDefaults standardUserDefaults] objectForKey:#"isKgs"] isEqualToString:#"No") {
[switch setOn:NO animated:NO];
}
However, if you use a BOOL, you can set the switch in one simple line:
[switch setOn:[[NSUserDefaults standardUserDefaults] boolForKey:#"isKgs"] animated:NO];
This means that you must go back and set up the defaults like this:
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setBool:NO forKey#"isKgs"];
[defaults synchronize];

Answer 3

At some point in your code you are going to have to check the switch state and write it back to userDefaults:
[[NSUserDefaults standardUserDefaults] setBool:[switch on] forKey:#"isKgsk"];
[defaults synchronize];
you can write the changes back to userDefaults in your switchChanged: function.
Also, if you always set your key to NO in didFinishLaunchingWithOptions: then it will never reflect changes made in the settings app, it will always be NO.... this is probably not what you want.