iOS: store two NSMutableArray in a .plist file

Question

I want to store two NSMutableArray that I use as global array in AppDelegate. These two array are also store with NSUserDefaults. Now I want to know how I must create this file and how can I store these two array everytime I modify them. Can You help me?

Payload

Answer 1

1. Create an NSArray containing your two NSMutableArrays.

   NSArray *array = [NSArray arrayWithObjects:<#(id), ...#>, nil];
   

2. Write the array to a file.

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
   NSString *libraryDirectory = [paths objectAtIndex:0];
   NSString *location = [libraryDirectory stringByAppendingString:@"/somefilename.plist"];
   [array writeToFile:location atomically:YES];
   

3. Load the array from the file.

   NSString *path = [bundle pathForResource:@"file" ofType:@"plist"];
   NSArry *array = (path != nil ? [NSArray arrayWithContentsOfFile:location] : nil);
   

Narra

and when I save it again? I want replace it, how can I do? – Payload

Have you checked that your NSArrays aren't nil? – Narra

How to extract the NSMutableArray from the array (NSArray in the code)? – Stroud