(iOS) Commands to save and load & copy from from the bundle and the documents directory.

FileCommands.m

+ (NSString*) pathForSaving 
{
    NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString* documentsDirectory = [paths objectAtIndex:0];
    return [documentsDirectory stringByAppendingPathComponent:@"fileName.plist"];
}

+ (void) loadFromDisk {

    NSString* path = [MyClass pathForSaving];
    
    NSFileManager *fileManager = [NSFileManager defaultManager];

    // If file dose not exist copy it from the bundle
    if (![fileManager fileExistsAtPath:path])
    { 
        NSString* bundlePath = [[NSBundle mainBundle] pathForResource:@"fileName" 
                                                               ofType:@"plist"];
        [fileManager copyItemAtPath:bundlePath
                             toPath:path
                              error:nil];
    }

    // ...

}