有条件地创建/读取.plist文件

Question

I want to check for the presence of a .plist file in the Documents directory. If it does not exist, I want to create it and seed it with the 1st entry. If it does exist I want to read it and append an entry to it.

if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {       
    // read Faves file...
    NSMutableDictionary *tempDict = [NSMutableDictionary dictionaryWithContentsOfFile:path];
    appDelegate.dictFaves = tempDict;
} else {
    NSLog(@"Creating Favorites file");
    BOOL result = [[NSFileManager defaultManager] createFileAtPath: path contents: (NSData *)appDelegate.dictFaves attributes: nil];            
}

// .... and Append it to the list of existing favorites
[appDelegate.dictFaves setObject:newFave forKey:key];

1. createFileAtPath returns FALSE meaning the file was not created.
2. I question the validity of casting appDelegate.dictFaves to (NSDATA *) . If that is unwise, how to I create a file with a Dictionary ?

Answer 1

You can write it using:

-[NSDictionary writeToURL:atomically:]

So, you can say:

[appDelegate.dictFaves writeToURL:url atomically:YES];

(assuming appDelegate.dictFaves is a valid NSDictionary )