Question

I am trying to write some data from an NSMutableArray to a plist, while keep the old plists content.

The function writeToFile:atomically: overwrites the old contents with the new, I want to append the objects in the new array to the plist.

How can this be done? Thank you.

How can you check for duplicates while doing this?

Answer 1

You could load the contents of the file into an array, then use addObjectsFromArray: in your MutableArray to load the contents into that, then use the writeToFile feature.

i.e.

NSArray *oldArray = [NSArray arrayWithContentsOfFile:filePath];
[newMutableArray addObjectsFromArray:oldArray];

.....

[newMutableArray writeToFile:filePath atomically:YES];