应用设置及用户默认设置

1.设置捆绑包

分组

文本框设置

安全文本框设置

多值字段

拨动开关设置

滑动条设置

子设置视图（more）

2.读取应用中得设置

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [self refreshFields];
}
- (void)refreshFields
{
    NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
    self.officerLabel.text = [defaults objectForKey:kOfficerKey];
    self.authorizationCodeLabel.text = [defaults objectForKey:kAuthorizationCodeKey];
    self.rankLabel.text = [defaults objectForKey:kRankKey];
    self.warpDriveLabel.text = [defaults boolForKey:kWarpDriverKey] ? @"Engaged" : @"Disabled";
    self.warpFactorLabel.text = [[defaults objectForKey:kWarpFactorKey] stringValue];
    self.favoriteTeaLabel.text = [defaults objectForKey:kFavoriteTeaKey];
    self.favoriteCaptainLabel.text = [defaults objectForKey:kFavoriteCaptainKey];
    self.favoriteGadgetLabel.text = [defaults objectForKey:kFavoriteGadgetKey];
    self.favoriteAlienLabel.text = [defaults objectForKey:kFavoriteAlienKey];
}

- (void)flipsideViewControllerDidFinish:(FMFlipsideViewController *)controller
{
    //返回翻转时，加载一次.
    [self refreshFields];
    [self dismissViewControllerAnimated:YES completion:nil];
}

3.应用中修改默认设置

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self refreshFields];
}
- (void)refreshFields
{
    NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
    self.engineSwitch.on = [defaults boolForKey:kWarpDriverKey];
    self.warpFactorSlider.value = [defaults floatForKey:kWarpFactorKey];
}
- (IBAction)engineSwitchTapped
{
    NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
    [defaults setBool:self.engineSwitch.on forKey:kWarpDriverKey];
    [defaults synchronize];
}
- (IBAction)warpSliderTouched
{
    NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
    [defaults setFloat:self.warpFactorSlider.value forKey:kWarpFactorKey];
    [defaults synchronize];
}

4.注册默认值（应用不知道设置捆绑包中得默认值）

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSDictionary * defaults = @{kWarpDriverKey : @YES,
                                kWarpFactorKey : @5,
                                kFavoriteAlienKey : @"Vulcan"};
    [[NSUserDefaults standardUserDefaults] registerDefaults:defaults];
    
    return YES;
}

5.保证设置有效

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    UIApplication * app = [UIApplication sharedApplication];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationWillEnterForeground:) name:UIApplicationWillEnterForegroundNotification object:app];
}
- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)applicationWillEnterForeground:(NSNotification *)notification
{
    NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
    [defaults synchronize];
    [self refreshFields];
}