如何請檢查是否應用程序是登錄或沒有第一次

Question

我希望在設備上的應用程序中，當用戶安裝應用程序時，用戶第一次用戶登錄後，將打開的應用程序和用戶保持登錄應該對他loginScreen有沒有什麼辦法，使這個保存，這樣，如果用戶再次打開應用第二則用戶應登錄陳述和不顯示用戶登錄屏幕感謝。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {  

    // Override point for customization after app launch. 
    self.splitViewController =[[UISplitViewController alloc]init]; 
    self.rootViewController=[[RootViewController alloc]init]; 
    self.detailViewController=[[[FirstDetailViewController alloc]init] autorelease]; 
    self.loginViewController=[[[LoginViewController alloc]init] autorelease]; 

    UINavigationController *rootNav=[[UINavigationController alloc]initWithRootViewController:rootViewController]; 
    UINavigationController *detailNav=[[UINavigationController alloc]initWithRootViewController:detailViewController]; 

    if ([detailNav.navigationBar respondsToSelector:@selector(setBackgroundImage:forBarMetrics:)]) 
    { 
     UIImage *image = [UIImage imageNamed:@"Nav.png"]; 
     [detailNav.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault]; 

    } 

    user_Name=@"Jamshaid"; 
    isClickedLogin=@"NO"; 
    userLogin=@"Logout"; 

    self.splitViewController.viewControllers=[NSArray arrayWithObjects:rootNav,detailNav,nil]; 
    self.splitViewController.delegate=self.detailViewController; 

    NSMutableArray *tempArray = [[NSMutableArray alloc] init]; 
    self.coffeeArray = tempArray; 
    [tempArray release]; 

    NSMutableArray *tempArray1 = [[NSMutableArray alloc] init]; 
    self.arrayOne = tempArray1; 
    [tempArray1 release]; 

    NSMutableArray *tempArray2 = [[NSMutableArray alloc] init]; 
    self.arrayTwo = tempArray2; 
    [tempArray2 release]; 

    NSMutableArray *tempArray3 = [[NSMutableArray alloc] init]; 
    self.libraryArray = tempArray3; 
    [tempArray3 release]; 

    NSMutableArray *tempArray4 = [[NSMutableArray alloc] init]; 
    self.activityArray = tempArray4; 
    [tempArray4 release]; 

    NSMutableArray *tempArray5 = [[NSMutableArray alloc] init]; 
    self.arrayOneC = tempArray5; 
    [tempArray5 release]; 

    NSMutableArray *tempArray6 = [[NSMutableArray alloc] init]; 
    self.arrayTwoC = tempArray6; 
    [tempArray6 release]; 

    NSMutableArray *tempArrayD = [[NSMutableArray alloc] init]; 
    self.detailArray = tempArrayD; 
    [tempArrayD release]; 

    NSMutableArray *tempArrayD1 = [[NSMutableArray alloc] init]; 
    self.detailArrayOne = tempArrayD1; 
    [tempArrayD1 release]; 

    NSMutableArray *tempArrayD2 = [[NSMutableArray alloc] init]; 
    self.detailArrayTwo = tempArrayD2; 
    [tempArrayD2 release]; 

    NSMutableArray *tempArrayD3 = [[NSMutableArray alloc] init]; 
    self.publishArray = tempArrayD3; 
    [tempArrayD3 release]; 

    [Coffee getInitialDataToDisplay:[self getDBPath]]; 

    // Add the split view controller's view to the window and display. 
    // original working [window addSubview:self.splitViewController.view]; 
    [window addSubview:splitViewController.view]; 
    [window makeKeyAndVisible]; 

    return YES; 
} 

Answer 1

我不做iPhone的開發，但使用配置文件不會輕易實現嗎？例如：

1. 應用程序啓動
2. 閱讀config.xml中
3. 是元素firstlogin或真或假？
   1. 如果爲true：顯示loginscreen，一旦用戶登錄，設置元素設置爲true，並保存XML。
   2. 如果假：完全不編輯XML和剛剛跳過loginscreen。
4. 運行的應用程序

這，當然，復位，如果應用程序重新安裝，我的身影。

Answer 2

示例代碼：

在yourViewController.h：

NSString *uname; 
NSString *pwd; 

在yourViewController.m：

- (IBAction) loginButtonClicked :(id)sender 
{ 
    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"HasLaunchedOnce"]) 
    { 
     // app already launched 
     uname = [[NSUserDefaults standardUserDefaults] valueForKey:@"UserName"]; 
     pwd = [[NSUserDefaults standardUserDefaults] valueForKey:@"PassWord"]; 
     //Use uname and pwd in your URL. 
    } 
    else 
    { 
     [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"HasLaunchedOnce"]; 
     [[NSUserDefaults standardUserDefaults] synchronize]; 
     // This is the first launch ever 
     [[NSUserDefaults standardUserDefaults] setValue:txtUserName.text forKey:@"UserName"]; 
     [[NSUserDefaults standardUserDefaults] setValue:txtPassWord.text forKey:@"PassWord"]; 
    } 
}