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iPhone read/write .plist file
NSString *filePath = @"/Users/Denis/Documents/Xcode/iPhone/MLBB/data.plist";
NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];
[plistDict setValue:@"Man" forKey:@"Gender"];
[plistDict writeToFile:filePath atomically: YES];

- (IBAction)segmentControlChanged{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *plistLocation = [documentsDirectory stringByAppendingPathComponent:@"data.plist"];
NSMutableDictionary* plistDict = [[NSMutableDictionary alloc] initWithContentsOfFile:plistLocation];

if (Gender.selectedSegmentIndex == 0) {
    [plistDict setObject:@"Man" forKey:@"Gender"];
    [plistDict writeToFile:plistLocation atomically: YES];
}
else
{
    [plistDict setObject:@"Women" forKey:@"Gender"];
    [plistDict writeToFile:plistLocation atomically: YES];
}
}

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *plistLocation = [documentsDirectory stringByAppendingPathComponent:@"myplist.plist"];

- (NSString *)copyFileToDocumentDirectory:(NSString *)fileName {

NSError *error;

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

NSString *documentDirPath = [documentsDir
                                                 stringByAppendingPathComponent:fileName];

NSArray *file = [fileName componentsSeparatedByString:@"."];
NSString *filePath = [[NSBundle mainBundle]pathForResource:
                                            [file objectAtIndex:0]
                                                                                                        ofType:[file lastObject]];


NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL success = [fileManager fileExistsAtPath:documentDirPath];

if(!success) {

    success = [fileManager copyItemAtPath:filePath
                                                                 toPath:documentDirPath
                                                                    error:&error];

    if (!success)
    NSAssert1(0, @"Failed to create writable txt file file with message '%@'.",
                        [error localizedDescription]);
}

return documentDirPath;

<array> <dict> key-value data </dict> <dict> key-value data </dict> </array>

/*Code to write into file*/

- (void)addToMyPlist {

    // set filemanage object
    NSFileManager *man = [NSFileManager defaultManager];

    // check whether file is exists or not
    NSString *plistPath = [self copyFileToDocumentDirectory:@"MyPlistFile.plist"];

    BOOL isExist = [man fileExistsAtPath:plistPath];
    // BOOL done = NO;

    if(!isExist) {

        // NSLog(@" n File not exist");
        // done = [man copyItemAtPath:file toPath:fileName error:&error];
    }
    // NSLog(@" n done===%d",done);

    // get data from plist file
    NSMutableArray * plistArray = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];

    // create dictionary using array data and bookmarkKeysArray keys
    NSArray *keysArray = [[NSArray alloc]initWithObjects:@"StudentNo",nil];
    NSArray *valuesArray = [[NSArray alloc]initWithObjects:[NSString stringWithFormat:@"1234"],nil];

    NSDictionary plistDict = [[NSDictionary alloc]initWithObjects: valuesArray forKeys: keysArray];

    [plistArray insertObject:poDict atIndex:0];

    // write data to  plist file
    //BOOL isWritten = [plistArray writeToFile:plistPath atomically:YES];
  [plistArray writeToFile:plistPath atomically:YES];

    plistArray = nil;

    // check for status
    // NSLog(@" n  written == %d",isWritten);
}