Saving Table View using NSUserDefaults

[loddy1234]

I have a table view set up and need to save it when the app quits and reload when it reopens. I have decided instead going through the delegate, to save the mutable array every time it is changed. I have the following method to save the array

-(void)save{
	
	NSUserDefaults *arraydefaults = [NSUserDefaults standardUserDefaults];
	[arraydefaults setObject:items forKey:@"items"]; //items is the mutable array i need to save
	
	[arraydefaults synchronize];
}

To reload the array, i have the following code

	if ([[NSUserDefaults standardUserDefaults] objectForKey:@"items"] == nil){
		items = [[NSMutableArray alloc] init];
	} 
	else{
		NSUserDefaults *settings = [NSUserDefaults standardUserDefaults];
		items = [[NSMutableArray arrayWithArray:[settings objectForKey:@"items"]]mutableCopy];
	}

When I restart the app then try to add a new item to the array it crashes. If I comment out the if statement, It behaves as normal but doesn't save.
Anyone help greatly appreciated

[smithdale87]

What is the error in the console whenever your app crashes?

[Duncan C]

Originally Posted by loddy1234

I have a table view set up and need to save it when the app quits and reload when it reopens. I have decided instead going through the delegate, to save the mutable array every time it is changed. I have the following method to save the array

-(void)save{
	
	NSUserDefaults *arraydefaults = [NSUserDefaults standardUserDefaults];
	[arraydefaults setObject:items forKey:@"items"]; //items is the mutable array i need to save
	
	[arraydefaults synchronize];
}

To reload the array, i have the following code

	if ([[NSUserDefaults standardUserDefaults] objectForKey:@"items"] == nil){
		items = [[NSMutableArray alloc] init];
	} 
	else{
		NSUserDefaults *settings = [NSUserDefaults standardUserDefaults];
		items = [[NSMutableArray arrayWithArray:[settings objectForKey:@"items"]]mutableCopy];
	}

When I restart the app then try to add a new item to the array it crashes. If I comment out the if statement, It behaves as normal but doesn't save.
Anyone help greatly appreciated

I started to explain that user defaults returns immutable copies of objects even if what you saved was originally mutable. However, I see that you have code that's supposed to be making a mutable copy.

Your code does not look correct however. You have both "arrayWithArray" and "mutableCopy" in the same statement. I didn't look at that line closely enough to figure out what you're doing, but I bet you're calling mutableCopy, and then passing that to "arrayWithArray" which is an NSArray method that will convert the array back to an immutable copy.