NSUserDefaults和alertView

Question

我正在創建一個免責聲明，當用戶第一次啓動應用程序時將會顯示。免責聲明是一個帶有2個選項的alertView。如果用戶同意，則會顯示firstViewController。如果他沒有，他會被重定向到另一個viewController。但如果用戶第一次同意，我不能讓免責聲明消失。每次應用啓動時都會顯示。任何幫助，將不勝感激。預先感謝您..

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 

     if (![[defaults valueForKey:@"keyDisclaimer"] isEqualToString:@"accepted"]) { 

UIAlertView *disclaimer = [[UIAlertView alloc] initWithTitle:@"Read Before use" message:@"By using this app you agree to its terms and conditions.\n\n\n\n\n\n\n\n\n\n\ntext heren\n\n\n\n\n\n\n\n\n\n\n\n\n" delegate:self cancelButtonTitle:@"No!" otherButtonTitles:@"Yes Let me In", nil]; 

[disclaimer show]; 

} 

// Override point for customization after application launch. 
return YES; 
} 

-(void) alertView:(UIAlertView *) alertView clickedButtonAtIndex:(NSInteger)buttonIndex{ 
NSString *buttonString = {[alertView buttonTitleAtIndex:buttonIndex]}; 

if ([buttonString isEqualToString:@"Yes Let me In"]) { 
    NSMutableDictionary* defaultValues = [NSMutableDictionary dictionary]; 

    [defaultValues setValue:@"accepted"forKey:@"keyDisclaimer"]; 

    [[NSUserDefaults standardUserDefaults] registerDefaults:defaultValues]; 



} 
else if ([buttonString isEqualToString:@"No!"]) { 
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Sorry!" message:@"You are not allowed to use this app due to the fact that you did not agree to the terms and Conditions. Please exit this app!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 
    [alert show]; 

// [[NSUserDefaults standardUserDefaults] setValue:@"notAccepted" forKey:@"keyDisclaimer"]; 
} 

    if ([buttonString isEqualToString:@"OK"]) { 
     introViewController *intro = [[introViewController alloc] initWithNibName:@"introViewController" bundle:nil]; 

     _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 

     _window.rootViewController = intro; 
     [_window makeKeyAndVisible]; 
    } 
} 

Answer 1

NSMutableDictionary* defaultValues = [NSMutableDictionary dictionary]; 
[defaultValues setValue:...forKey:...] 
[[NSUserDefaults standardUserDefaults] registerDefaults:defaultValues]; 

這將註冊您的默認值，如果他們不設置（首次）

而且，好像你忘[defaults synchronize]設置後，提交更改值。如果是這樣，你根本不需要registerDefaults方法。

像這樣：

if ([buttonString isEqualToString:@"Yes Let me In"]) { 
    NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults]; 
    [defaults setValue:@"accepted"forKey:@"keyDisclaimer"]; 
    [defaults synchronize]; 
} 

Answer 2

你想使用類似stringForKey或objectForKey代替valueForKey。

if([[defaults stringForKey:@"keyDisclaimer"] isEqualToString:@"accepted"]) { 

我在過去並沒有總是以我想要的方式工作，但我在valueForKey中遇到過不好的經歷。這可能是什麼導致你一些問題。