Reading and writing NSMutableDictionary to a plist file

Question

I am trying to save NSMutableDictionary in applicationDidEnterBackground of AppDelegate.m an to a plist file. Immediately after saving it, I try to check if the file exists and read it back, but the file is not found.

NSString *photoCacheFilename = @"photoCache.plist";
[photoDict writeToFile:photoCacheFilename atomically:YES];
NSLog(@"File name: %@", photoCacheFilename);
BOOL isFile = [[NSFileManager defaultManager] fileExistsAtPath:photoCacheFilename];
if(isFile)
{
    NSLog (@"File found");
    NSMutableDictionary *newDictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:photoCacheFilename];
}
else
{
    NSLog (@"File not found");
}

I modified the code as suggested by some users, but still the file is not found. I am not sure if I am checking for the existence of file correctly.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString *photoCacheFilename = [documentsPath stringByAppendingPathComponent:@"photoCache.plist"];

[photoDict writeToFile:photoCacheFilename atomically:YES];

BOOL isFile = [[NSFileManager defaultManager] fileExistsAtPath:photoCacheFilename];
if(isFile)
{
    NSLog (@"File found");
    NSMutableDictionary *newDictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:photoCacheFilename];
}
else
{
    NSLog (@"File not found");
}

Answer 1

You are not specifying the correct path of the Documents directory

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
NSString *documentsPath = [paths objectAtIndex:0];

NSString *photoCacheFilename = [documentsPath stringByAppendingPathComponent:@"photoCache.plist"]; // Correct path to Documents Dir in the App Sand box

[photoDict writeToFile:photoCacheFilename atomically:YES]; //Write