Change the starting View in a tabbed iOS application - ios

Question

i have created a tabbed application and created another file, called LogInScreen,
I want to change the usual view which comes up at the application launch to this new LogInFile, but everything I tried didn't work.
This is the AppDelegate.h file:
#import <UIKit/UIKit.h>
#import "LogInScreen.h"
#interface LogInScreen : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) LogInScreen *logInView;
#end
#interface AppDelegate : UIResponder <UIApplicationDelegate>
#property (strong, nonatomic) UIWindow *window;
#end
At the first #implementation appears an error message: Duplicate interface definition for class 'LogInScreen', I guess because of the LogInScreen.h file. I don't know how to get it to work properly.
And this the start of the AppDelegate.m:
#import "AppDelegate.h"
#implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions: (NSDictionary *)launchOptions
{
[self.logInView addSubview:_logInView.view];
[self.logInView makeKeyAndVisible];
[self.logInView setRootViewController:_logInView];
// Override point for customization after application launch.
return YES;
}
I found this code on this website, but it didn't work...
Here's the LogInScreen.h file:
#import <UIKit/UIKit.h>
#interface LogInScreen : UIViewController{
NSString *password;
IBOutlet UITextField *passwordField;
}
- (IBAction)enterPassword;
- (IBAction)savepassword:(id)sender;
- (IBAction)returnKey:(id)sender;
- (IBAction)switchView:(id)sender;
#end
and the LogInScreen.m:
#import "LogInScreen.h"
#import "FirstViewController.h"
/* #import "AppDelegate.h"
int main(int argc, char * argv[])
{
#autoreleasepool {
return UIApplicationMain()(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
*/
#interface LogInScreen ()
#end
#implementation LogInScreen
- (IBAction)enterPassword
{
NSString *passwordString = [NSString stringWithFormat:#"12345"];
if ([passwordField.text isEqualToString:passwordString]) {
/*[self switchView:nil]; */
}
else {
UIAlertView *incorrectPassword = [[UIAlertView alloc] initWithTitle:#"Falsches Passwort" message:#"Dieses Passwort ist falsch! Geben Sie bitte das korrekte Passwort ein!" delegate:self cancelButtonTitle:#"Zurück" otherButtonTitles:nil, nil];
[incorrectPassword show];
}
}
- (IBAction)savepassword:(id)sender {
password = [[NSString alloc] initWithFormat:passwordField.text];
[passwordField setText:password];
NSUserDefaults *stringDefault = [NSUserDefaults standardUserDefaults];
[stringDefault setObject:password forKey:#"stringKey"];
}
- (IBAction)returnKey:(id)sender {
[sender resignFirstResponder];
}
- (IBAction)switchView:(id)sender {
FirstViewController *main = [[FirstViewController alloc] initWithNibName:nil bundle:nil];
[self presentViewController:main animated:YES completion:NULL];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[passwordField setText:[[NSUserDefaults standardUserDefaults] objectForKey:#"stringKey"]];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Would be cool if someone could help me

Answer 1

Following my comment, you can use this code to show a modal login view before your main tabbed view:
// Main menu view controller
MainViewController *mainViewController = [[MainViewController alloc] initWithNibName:#"MainViewController" bundle:nil];
UINavigationController *mainNavigationController = [[UINavigationController alloc] initWithRootViewController:mainViewController];
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.delegate = self;
self.tabBarController.viewControllers = [NSArray arrayWithObjects:mainNavigationController, nil];
self.window.rootViewController = self.tabBarController;
[self.window.rootViewController.view setOpaque:NO];
self.window.rootViewController.view.backgroundColor = [UIColor clearColor];
self.tabBarController.selectedIndex = 0;
[self.window setRootViewController:self.tabBarController];
[self.window makeKeyAndVisible];
// Login modal view controller
LoginViewController *loginController = [[LoginViewController alloc] initWithNibName:#"LoginViewController" bundle:nil];
[self.tabBarController presentViewController:loginController animated:NO completion:nil];

Answer 2

Place your login screen as intial view in MainStoryBoard .Drag a drop a uitabbarcontroller connect a segue from loginscreen to uitabbar and present modal that tabbar from a button in the login screen .