从首选项中读取值

Question

我最近刚刚实现了inAppSettings工具包。我的目标是加载我的默认视图，然后在右侧添加一个名为"settings“的导航栏按钮项。一旦用户按下设置按钮，它将把他们带到我的设置捆绑包，在那里他们可以选择他们想要的网站，然后按back，这将再次加载我的默认视图，webview再次加载新的url。

我已经实现了我刚才描述的所有东西，但是一旦在设置中进行了选择，用户按下了back (也就是关闭设置视图返回到默认视图)，应用程序就会崩溃，我不知道为什么。我的代码如下，如果有人知道为什么会发生这种情况，我将不胜感激。需要注意的是，一旦我在应用程序崩溃后再次运行它，网站就会根据他们在崩溃前选择的设置正确加载。

附注:用户可以点击选择的选项有: Google，stackoverflow。

错误消息:由于未捕获异常'NSInvalidArgumentException'，正在终止应用程序，原因：‘-即将到来的settingsViewControllerDidEnd:：无法识别的选择器已发送到实例0x281c70’

提前谢谢你

- (IASKAppSettingsViewController*)appSettingsViewController {
    if (!appSettingsViewController) {
        appSettingsViewController = [[IASKAppSettingsViewController alloc] initWithNibName:@"IASKAppSettingsView" bundle:nil];
        appSettingsViewController.delegate = self;
    }

    return appSettingsViewController;
}

-(IBAction)selectSettings {
    UINavigationController *aNavController = [[UINavigationController alloc] initWithRootViewController:self.appSettingsViewController];
    //[viewController setShowCreditsFooter:NO];   // Uncomment to not display InAppSettingsKit credits for creators.
    // But we encourage you not to uncomment. Thank you!
    self.appSettingsViewController.showDoneButton = YES;
    [self presentModalViewController:aNavController animated:YES];
    [aNavController release];
}

-(NSDictionary *)intialDefaults {
    NSArray *keys = [[[NSArray alloc] initWithObjects:kPicture, nil] autorelease];  
    NSArray *values= [[[NSArray alloc] initWithObjects: @"none", nil] autorelease];
    return [[[NSDictionary alloc] initWithObjects: values forKeys: keys] autorelease];
} 

-(void)setValuesFromPreferences {
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    [userDefaults registerDefaults:[self intialDefaults]];
    NSString *picturePreference= [userDefaults stringForKey:kPicture];

    if([picturePreference isEqualToString:@"google"]) {             
        [self getUpcoming:@"http://www.google.ca"];
    } else 
    if ([picturePreference isEqualToString:@"stackoverflow"]) {
        [self getUpcoming:@"http://www.stackoverflow.com"];
    } else {
        [self getUpcoming:@"http://www.yahoo.com"];
    }
}

-(void)getUpcoming:(id) hello {
    NSURL *url= [NSURL URLWithString:hello];
    NSURLRequest *requestURL= [NSURLRequest requestWithURL:url];
    [web loadRequest:requestURL];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    web.hidden=NO;
    [spinner stopAnimating];
    [load_message dismissWithClickedButtonIndex:0 animated:TRUE];
    pic1.hidden=YES;
}

-(void) loadMethod {
    load_message = [[UIAlertView alloc] initWithTitle:@"Loading..." message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:nil];

    spinner= [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    spinner.center = CGPointMake(135.0, 60.0);

    [load_message addSubview:spinner];
    [load_message show];
    [spinner startAnimating];
    [self performSelector:@selector(setValuesFromPreferences) withObject:nil afterDelay:0.0];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    UIBarButtonItem *settingButton= [[UIBarButtonItem alloc]
                               initWithTitle:@"Settings"
                               style:UIBarButtonItemStyleBordered
                               target:self
                               action:@selector(selectSettings)];

    self.navigationItem.rightBarButtonItem = settingButton;
    web.hidden=YES;
    pic1.hidden=NO;
}

- (void) viewDidAppear:(BOOL)animated {
    [self loadMethod];
}

Answer 1

你实现InAppSettingKit委托了吗？将它添加到上面的当前类中

- (void)settingsViewControllerDidEnd:(IASKAppSettingsViewController *)sender
{
    // dismiss the view here
    [self dismissModalViewControllerAnimated:YES];
    // do whatever you need to do
}