Question

I am making an Iphone app and I have a user click a button and it changes the sorting in my fetched results controller. However after I close my app it changes back to the original way it was sorted. i was just wondering if there is anyway to keep that button pressed when the app reopens.

- (IBAction)btnValue:(id)sender {
self.model.frc_Work.delegate = self;

 NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"Value" ascending:YES];
self.model.frc_Work.fetchRequest.sortDescriptors = [NSArray arrayWithObject:sortDescriptor];

}

Answer 1

Yes. Just use NSUserDefaults to store information:

// Set this to the correct value when the button is pressed
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"ButtonPressedKey"];

then, when you’re laying out your button:

if ([[NSUserDefaults standardUserDefaults] boolForKey:@"ButtonPressedKey"]){
    // Do whatever you're currently doing to keep the button pressed during runtime.
}

NSUserDefaults is basically an NSDictionary that persists across app launches. It only stores property-list values (NSNumber, NSString, NSData, NSArray, NSDictionary, and NSDate) and primitives like BOOLs.

Here’s an example project demonstrating this using a UISwitch: https://github.com/MaxGabriel/ButtonPersistence