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Switching to a TabBar tab view programmatically?

Let's say I have a UIButton in one tab view in my iPhone app, and I want to have it open a different tab in the tab bar of the TabBarController. How would I write the code to do this?

I'm assuming I unload the existing view and load a specific tab view, but I'm not sure how to write the code exactly.

Thanks.

UITabBarController is possible to select the tab via code?

is it UITabBarController possible to select the tab in code?like UINavigationController we can use popViewController pop back to rootViewController instead of press the back button, so how can this implement in tabbarcontroller?

last Button of actionsheet does not get clicked

I have used an actionsheet in my project and when it appears it show all buttons but last (4th) button does not responds to my click(only it's half part responds)..

I know the reason it is because i have used a TabBarController and the present class is inside that tabbar controller.... only that part of the actionsheet is responding which is above the tabs....and my last button is half above and half is on top of tabbar

please help

Hiding UITabBar when pushing a UIView

I have a UITabBarController where the default view controller is a UINavigationController. I want to be able to hide the UITabBar of the UITabBarController when I push a certain view in the UINavigationController.

I've tried adding:

delegate.tabBarController.hidesBottomBarWhenPushed = YES;

in my UINavigationController before I push the view, but that doesn't seem to do the trick.

Any tips on what I should be doing or if it's even possible? Thanks in advance!

iPhone: How to switch tabs with an animation?

I'm switching tabs programmatically in a tab bar driven application using UITabBarController.selectedIndex. The problem I'm trying to solve is how to animate the transition between the views. ie. from the view of the current tab to the view of the selected tab.

The first thought was to make use of the UITabBarControllerDelegate, but it appears that this is not called when programmatically switching tabs. I'm now considering the UITabBarDelegate.didSelectItem: as a possible hook to set a transition animation.

Has anyone managed to animate the transitions? If yes, how ?

Tab Bar covers TableView cells in iOS7

I have a custom tableViewController that I'm adding to a TabBarController with

self.tabBarController.viewControllers = [NSArray arrayWithObjects:someOtherViewController, customTableViewController, nil];
self.tabBarController.selectedIndex = 1;

The issue I'm having is that the last 1.5 tableViewCells are being covered by the tab bar at the bottom of the screen on an iPhone 4 running iOS7. When I use the iOS Simulator - iPhone Retina (4-inch) / iOS 7.0 the issue still exists.

What is the correct way to make the tableView line up with the top of the tabBar at the bottom of the screen without using 'magic numbers'?

Determine if UIView is visible to the user?

is it possible to determine whether my UIView is visible to the user or not?

My View is added as subview several times into a Tab Bar Controller.

Each instance of this view has a NSTimer that updates the view.

However I don't want to update a view which is not visible to the user.

Is this possible?

Thanks

how to get the event that switch tab menu on iphone

I'm trying to figure out how to catch the event that controls the switch tabs on the UITabBarController. How could I accomplish this?

Changing Tint / Background color of UITabBar

The UINavigationBar and UISearchBar both have a tintColor property that allows you to change the tint color (surprising, I know) of both of those items. I want to do the same thing to the UITabBar in my application, but have found now way to change it from the default black color. Any ideas?

Unbalanced calls to begin/end appearance transitions for

I read SO about another user encountering similar error, but this error is in different case.

I received this message when I added a View Controller initially:

Unbalanced calls to begin/end appearance transitions for 
<UITabBarController: 0x197870>

The structure of the app is as follow:

I got a 5-tab TabBarController linked to 5 View Controllers. In the initial showing tab, I call out a new View Controller to overlay as an introduction of the app.

I use this code to call the introduction view controller:

IntroVC *vc = [[IntroVC alloc] init];
[self presentModalViewController:vc animated:YES];
[vc release]; 

After this IntroVC view controller shows up, the above error shows.

p.s. I am using xCode 4.2 & iOS 5.0 SDK, developing iOS 4.3 app.

What size should TabBar images be?

I have icons for a tabBar of size 100.

I checked at Apple's Human Interface Guidelines and it says the image size should be 30x30 / 60x60.

But as the height of tab bar controller is 50, I kept the size of the image at 50x50.

Now, when I run the project, I see the ugly design below:

Any idea what size images I should use so that the design will be perfect?

Note: I am not writing text also (e.g. Home, Search, etc). The text of the tab button is there in the image itself.

How to change inactive icon/text color on tab bar?

How can I change inactive icon/text color on iOS 7 tab bar? The one in gray color.

How to hide tab bar with animation in iOS?

So I have a button that is connected to a IBAction. When I press the button I want to hide the tab bar in my iOS app with a animation. This [self setTabBarHidden:hidden animated:NO]; or this [self.tabBarController setTabBarHidden:hidden animated:YES]; does not work. This is my code without the animation:

- (IBAction)picture1:(id)sender {
    [self.tabBarController.tabBar setHidden:YES];
}

Any help would be greatly appreciated :D

Showing login view controller before main tab bar controller

I'm creating an iPad app with a tab bar controller that requires login. So on launch, I want to show a LoginViewController and if login is successful, then show the tab bar controller. This is how I implemented an initial test version (left out some typical header stuff, etc)...

AppDelegate.h:

@interface AppDelegate_Pad : NSObject 
        <UIApplicationDelegate, LoginViewControllerDelegate> {
    UIWindow *window;
    UITabBarController *tabBarController;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UITabBarController *tabBarController;
@end

AppDelegate.m:

@implementation AppDelegate_Pad
@synthesize window;
@synthesize tabBarController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    LoginViewController_Pad *lvc = [[LoginViewController_Pad alloc] initWithNibName:@"LoginViewController_Pad" bundle:nil];
    lvc.delegate = self;
    [window addSubview:lvc.view];
    //[lvc release];
    [window makeKeyAndVisible];
    return YES;
}
- (void)loginViewControllerDidFinish:(LoginViewController_Pad *)loginViewController {
    [window addSubview:tabBarController.view];
}
- (void)dealloc {...}
@end

LoginViewController_Pad.h:

@protocol LoginViewControllerDelegate;
@interface LoginViewController_Pad : UIViewController {
    id<LoginViewControllerDelegate> delegate;
}
@property (nonatomic, assign) id <LoginViewControllerDelegate> delegate;
- (IBAction)buttonPressed;
@end
@protocol LoginViewControllerDelegate
-(void)loginViewControllerDidFinish:(LoginViewController_Pad *)loginViewController;
@end

LoginViewController_Pad.m:

@implementation LoginViewController_Pad
@synthesize delegate;
    ...
- (IBAction)buttonPressed
{
    [self.view removeFromSuperview];
    [self.delegate loginViewControllerDidFinish:self];
}
    ...
@end

So the app delegate adds the login view controller's view on launch and waits for login to call "did finish" using a delegate. The login view controller calls removeFromSuperView before it calls didFinish. The app delegate then calls addSubView on the tab bar controller's view.

If you made it up to this point, thanks, and I have three questions:

1. MAIN QUESTION: Is this the right way to show a view controller before the app's main tab bar controller is displayed? Even though it seems to work, is it a proper way to do it?

2. If I comment out the "lvc release" in the app delegate then the app crashes with EXC_BAD_ACCESS when the button on the login view controller is pressed. Why?

3. With the "lvc release" commented out everything seems to work but on the debugger console it writes this message when the app delegate calls addSubView for the tab bar controller: Using two-stage rotation animation. To use the smoother single-stage animation, this application must remove two-stage method implementations. What does that mean and do I need to worry about it?

UPDATE: As suggested by lucius, changed it to modally show the login view controller from the app delegate. This appears to be a cleaner solution. Code changed as follows...

AppDelegate.m:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [window addSubview:tabBarController.view];
    [window makeKeyAndVisible];

    LoginViewController_Pad *lvc = [[LoginViewController_Pad alloc] initWithNibName:@"LoginViewController_Pad" bundle:nil];
    lvc.delegate = self;
    [self.tabBarController presentModalViewController:lvc animated:NO];
    [lvc release];

    return YES;
}
-(void)loginViewControllerDidFinish:(LoginViewController_Pad *)loginViewController {
    [self.mainTabBarController dismissModalViewControllerAnimated:NO];
}

LoginViewController_Pad.m:

- (IBAction)buttonPressed
{
    //do NOT removeFromSuperview, delegate will dismiss
    //[self.view removeFromSuperview];
    [self.delegate loginViewControllerDidFinish:self];
}

Unbalanced calls to begin/end appearance transitions for UITabBarController

I have an UITabBarController, when initial run, I want to overlay a login view controller but received error.

Unbalanced calls to begin/end appearance transitions for < UITabBarController: 0x863ae00 >.

Below is the code.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

    // Override point for customization after application launch.

    UIViewController *lessonVC = [[[LessonViewController alloc] initWithNibName:@"LessonViewController" bundle:nil] autorelease];

    UIViewController *programVC = [[[ProgramViewController alloc] initWithNibName:@"ProgramViewController" bundle:nil] autorelease];

    UIViewController *flashcardVC = [[[FlashCardViewController alloc] initWithNibName:@"FlashCardViewController" bundle:nil] autorelease];

    UIViewController *moreVC = [[[MoreViewController alloc] initWithNibName:@"MoreViewController" bundle:nil] autorelease];

    UINavigationController *lessonNVC = [[[UINavigationController alloc] initWithRootViewController:lessonVC] autorelease];

    UINavigationController *programNVC = [[[UINavigationController alloc] initWithRootViewController:programVC] autorelease];

    UINavigationController *flashcardNVC = [[[UINavigationController alloc] initWithRootViewController:flashcardVC] autorelease];

    UINavigationController *moreNVC = [[[UINavigationController alloc] initWithRootViewController:moreVC] autorelease];

    self.tabBarController = [[[UITabBarController alloc] init/*WithNibName:nil bundle:nil*/] autorelease];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:lessonNVC, programNVC, flashcardNVC, moreNVC, nil];
    self.tabBarController.selectedIndex = 0;
    self.window.rootViewController = self.tabBarController;

    [self.window makeKeyAndVisible];

    if (![[ZYHttpRequest sharedRequest] userID]) 
    {
        // should register or login firstly
        LoginViewController *loginVC = [[LoginViewController alloc] initWithNibName:@"LoginViewController"
                                                                             bundle:nil];
        loginVC.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
        [self.tabBarController presentModalViewController:loginVC animated:YES];
        ZY_SAFE_RELEASE(loginVC);
    }

    return YES;
}

Anyone who can help me? Thanks in advance!