Accessing saved settings

Your settings area is now completed, it will save the settings to a file in the directory (see above) and it is now time for your tweak to read it. And with the PostNotification it will also be able to reload it instantly without the need for a respring.

Open up your Tweak.xm and change it to this.

static BOOL SCisEnabled = YES; // Default value
static NSString* SCtext = nil;

%hook SBLockScreenView
- (void)setCustomSlideToUnlockText:(id)arg1
{
    if(SCtext && SCisEnabled)
    {
        arg1 = SCtext;
    }
    %orig(arg1);
}
%end

static void loadPrefs()
{
    NSMutableDictionary *prefs = [[NSMutableDictionary alloc] initWithContentsOfFile:@"/var/mobile/Library/Preferences/com.jontelang.sliderchangerprefs.plist"];
    if(prefs)
    {
        SCisEnabled = ( [prefs objectForKey:@"SCisEnabled"] ? [[prefs objectForKey:@"SCisEnabled"] boolValue] : SCisEnabled );
        SCtext = ( [prefs objectForKey:@"SCtext"] ? [prefs objectForKey:@"SCtext"] : SCtext );
        [SCtext retain];
    }
    [prefs release];
}

%ctor 
{
    CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), NULL, (CFNotificationCallback)loadPrefs, CFSTR("com.jontelang.sliderchangerprefs/settingschanged"), NULL, CFNotificationSuspensionBehaviorCoalesce);
    loadPrefs();
}

The %ctor thing here is a method which will run when the tweak is loaded, it will only run once (per respring) and is the place we use to register the tweak for listening to our PostNotification. The register method specifies which string to listen to and which method to call when it gets the correct string. I've created a method called "loadPrefs" that is run each time. This method simply loads the settings-saved file and reads the values from it.

TIP: Remember to (as in my case) make sure the value is actually present in the dictionary/file. Otherwise you might end up with mismatched default values and so on.

The rest of the tweak is pretty straight forward. I just create some static variables and add the extra check in setCustomSlideToUnlockText to make sure nothing is modified if the tweak is, for example, disabled.