Read and Write NSArray, NSDictionary and NSSet to a File

NSString  *arrayPath;
NSString  *dictPath;
NSArray *array = @[@"IPA", @"Pilsner", @"Stout"];

NSDictionary *dictionary = @{@"key1" : array,
@"key2" : @"Hops",
@"key3" : @"Malt",
@"key4" : @"Yeast" };

// Get path to documents directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);

if ([paths count] > 0)
{
// Path to save array data
arrayPath = [[paths objectAtIndex:0]
stringByAppendingPathComponent:@"array.out"];

// Path to save dictionary
dictPath = [[paths objectAtIndex:0]
stringByAppendingPathComponent:@"dict.out"];

// Write array
[array writeToFile:arrayPath atomically:YES];

// Write dictionary
[dictionary writeToFile:dictPath atomically:YES];
}

// Read both back into new NSArray and NSDictionary object
NSArray *arrayFromFile = [NSArray arrayWithContentsOfFile:arrayPath];
NSDictionary *dictFromFile = [NSDictionary dictionaryWithContentsOfFile:dictPath];

// Print the contents
for (NSString *element in arrayFromFile)
NSLog(@"Beer: %@", element);

for (NSString *key in dictFromFile)
NSLog(@"%@ : %@", key, [dictionary valueForKey:key]);

Beer: IPA
Beer: Pilsner
Beer: Stout
key1 : (
IPA,
Pilsner,
Stout
)
key2 : Hops
key3 : Malt
key4 : Yeast