How can I reload/reassign navigation bar items? I use some libraries that change navigation bar and sometimes I have a bag in which all navigation items disappear. I have reassigned right items in viewWillAppear like:
UIButton *actionButton = [UIButton buttonWithType:UIButtonTypeCustom];
actionButton.frame = CGRectMake(270, 0, 50, 50);
actionButton.adjustsImageWhenHighlighted = YES;
[actionButton setImage:[UIImage imageNamed:#"share.png"] forState:UIControlStateNormal];
[actionButton setImage:[UIImage imageNamed:#"share-active.png"] forState:UIControlStateHighlighted];
[actionButton addTarget:self action:#selector(presentActivity) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *actionBarButton = [[UIBarButtonItem alloc]initWithCustomView:actionButton];
actionBarButton.tintColor = [UIColor whiteColor];
self.navigationItem.rightBarButtonItem = actionBarButton;
But it does not work and sometimes I do not have any navigation items.
UIBarButtonItem
is not child of UIButton.
here is not known methods like setImage:forState: etc.
create and custon an UITabBarButton like this
UIBarButtonItem *newBackButton = [[UIBarButtonItem alloc] initWithTitle:#"" style:UIBarButtonItemStyleBordered target:self action:#selector(goBack)];
newBackButton.image = [UIImage imageNamed:#"back"];
self.navigationItem.leftBarButtonItem=newBackButton;
also verify if method with this code will be called when viewDidLoad
Check out this like https://developer.apple.com/library/ios/documentation/uikit/reference/uinavigationbar_class/Reference/UINavigationBar.html the apple dev is awesome.
This is another good link
AppCoda has a lot of great tutorials this one has everything you need to know about Nav Bars
http://www.appcoda.com/customize-navigation-status-bar-ios-7/
and you could also use perform segue with identifier method and to send a string or something to a new view controller and then when you see that string is equal to what you want use an if statement in your viewWillAppear method.
Related
I need to make two button (add and delete) in the top of the view in my application just like the alarm clock.
how can i put like these buttons can anyone help me?
many thanks,
Initiate UIBarButtons in ViewDidLoad method
UIBarButtonItem *addButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:#selector(addButtonTapped:)];
UIBarButtonItem *editButton =[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:#selector(editButtonTapped:)];
Place them in navigationBar as NavigationItem
self.navigationItem.rightBarButtonItem = addButton;
self.navigationItem.leftBarButtonItem = editButton;
If you want to use two buttons on same side of NavigationBar use
[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:editButton,addButton, nil]];
These are called UIBarButtonItems and you need to instantiate them and add to your navigationItem as follows in your viewDidLoad method of your view controller.
self.navgiationItem.leftBarButtonItem = yourButtonInstance;
P.S. if you please ask your question with more detail like supporting it with screen shots, etc would be more helpful for answer.
This SO question and answer is exactly what you need.
If you are looking to add one in Navigation bar
-(void)setNavigationBarRightButton
{
UIButton *rightButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 26, 26)];
[rightButton setImage:[UIImage imageNamed:#"setting.png"] forState:UIControlStateNormal];
[rightButton setShowsTouchWhenHighlighted:TRUE];
[rightButton addTarget:self action:#selector(onClickrighttButton:) forControlEvents:UIControlEventTouchDown];
UIBarButtonItem *barBackItem = [[UIBarButtonItem alloc] initWithCustomView:rightButton];
// self.navigationItem.hidesBackButton = TRUE;
self.navigationItem.rightBarButtonItem = barBackItem;
}
- (void)onClickrighttButton:(id)sender
{
NSLog(#"right button");
}
and in viewdidload
[self setNavigationBarRightButton];
You can add any image you like
I was practicing an application with navigation bar. I used UIBarButton to go to the next screen from the main screen.
UIButton *moveLeft = [UIButton buttonWithType:UIButtonTypeCustom];
[moveLeft setTitle:#"Next Screen" forState:UIControlStateNormal];
moveLeft.titleLabel.font = [UIFont fontWithName:#"Helvetica-Bold" size:12.0f];
[moveLeft.layer setCornerRadius:4.0f];
[moveLeft.layer setBorderWidth:1.0f];
[moveLeft.layer setBorderColor: [[UIColor redColor] CGColor]];
moveLeft.frame=CGRectMake(200, 100.0, 90.0, 30.0);
[moveLeft setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];
[moveLeft addTarget:self action:#selector(moveToNext) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem* barbutton= [[UIBarButtonItem alloc] initWithCustomView:moveLeft];
self.navigationItem.rightBarButtonItem = barbutton;
But now when the second screen appears there is no navigation bar.
Here are the screen shots of the app
i tried UIBarButton for back also but still navigation bar is not coming on the second screen.
UIBarButtonItem *back = [[UIBarButtonItem alloc] initWithTitle:#"Back"
style:UIBarButtonItemStylePlain
target:nil
action:nil];
[[self navigationItem] setBackBarButtonItem:back];
My question how do i show the back button the second screen?? i am not making any custom button but the default is also not coming automatically.
Please guide me.
From your comments, you are presenting the next view controller, instead of this
[self presentViewController:secondScreen animated:YES completion:nil];
Do like this
[self.navigationController pushViewController:secondScreen animated:YES]
Suggestion
Instead of adding subView to the window, you should set the rootViewController of the window which is the recommended way. So change
[self.window addSubview:[navControll view]];
To
self.window.rootViewController = navControll;
No one answered the question correctly, I met the same question, and I have solve it by myself. My solution is delete the navigation controller before the child view controller , than control drag between the tableview controller to the child view controller, select the "show"
You have to use UINavigationController. It will be root view controller for your app. Put mainVC into it and then just pushViewController second vc.
You can access navigation controller via navigationController method of any vc(mainVC in your case).
Simply u can add custom back button to navigationBar
UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, button_width, button_height)];
[backButton setImage:[UIImage imageNamed:#"back.png"] forState:UIControlStateNormal];
[backButton addTarget:self action:#selector(backAction) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
I use this category method on UIBarButtonItem to create custom buttons as follows:
+ (UIBarButtonItem*)itemWithImage:(UIImage*)image forState:(UIControlState)controlState target:(id)target action:(SEL)action{
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setImage:image forState:controlState];
button.frame= CGRectMake(0.0, 0.0, 44, 44);
[button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
UIView *v=[[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 44, 44) ];
[v addSubview:button];
return [[UIBarButtonItem alloc] initWithCustomView:button];
}
I then create the buttons and assign them to the navigation item in my view controller as follows:
-(void)viewDidLoad{
[super viewDidLoad];
UIBarButtonItem * cancelButtonItem = [UIBarButtonItem itemWithImage:[UIImage imageNamed:#"Cancel"] forState:UIControlStateNormal target:self action:#selector(cancel)];
self.navigationItem.leftBarButtonItem = cancelButtonItem;
UIBarButtonItem * checkmarkButtonItem = [UIBarButtonItem itemWithImage:[UIImage imageNamed:#"checkmark_active"] forState:UIControlStateNormal target:self action:#selector(done)];
self.navigationItem.rightBarButtonItem = checkmarkButtonItem;
}
The first time I create a view controller and push it, the button works, but when creating a brand new view controller and pushing it onto the navigation stack, it breaks. Any ideas? I have thoroughly debugged this and am out of ideas.
There doesn't appear to be anything wrong with the category section of your code. I suspect that the error might be stemming from something else. Some more information or code may help here... what do you mean by break etc.
Check the way you initialise the ViewController before you push it onto the stack, perhaps a simple syntax error or mistaken nib name if using outlets.
I cannot figure out how to disable the back-button animation that occurs in the navigation bar when switching from a tableview to a standard view (when a cell is selected). There is no obvious line of code that enabled animation to begin with. Here it is in gif-form:
The navigation buttons in the Facebook app do not animate, so it is possible.
It may be relevant to mention that I am using the ViewDeck library to create the Facebook-like tableView menu, i.e. swipe to the right to expose a table.
EDIT: solution is based on Hesham Abd-Elmegid's answer but modified to use a custom image...
UIImage *settingsImage = [UIImage imageNamed:#"back_button#2x.png"];
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
backButton.frame = CGRectMake(280.0, 10.0, 29.0, 29.0);
[backButton setBackgroundImage:settingsImage forState:UIControlStateNormal];
backButton.frame = CGRectMake(0, 0, 50, 30);
[backButton addTarget:self action:#selector(goBack) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = customBarItem;
If you set a custom UIBarButtonItem as a left navigation item (instead of standard back button item), it will fade instead of slide in, just like in Facebook's app. Just create a simple method that will replace back button functionality by calling popViewControllerAnimated: on the navigation controller in which your detail view controller is contained.
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStyleBordered target:self action:#selector(goBack)] autorelease];
}
- (void)goBack
{
[self.navigationController popViewControllerAnimated:YES];
}
Note: UIBarButtonItem can also be set up with an image using initWithImage:style:target:action: method.
You could replace the back button with a custom UIButton. That way it won't animate on transition.
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[button setTitle:#"Back" forState:UIControlStateNormal];
backButton.frame = CGRectMake(0, 0, 50, 30);
[backButton addTarget:self action:#selector(onBack) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = customBarItem;
[customBarItem release];
You will have to find a PNG for the arrow shape of the back button though.
The default solvings are not appropriate:
to change the previous ViewController title - I need to make my own function controlling the button touches up
to make a leftBarButtonItem and hide backBarButtonItem - leftBarButtonItem doesn't look like a default backBarButtonItem.
Here's an example to create a custom leftBarButtonItem:
UIImage *buttonImage = [UIImage imageNamed:#"backbutton.png"];
UIButton *aButton = [UIbutton buttonWithType:UIButtonTypeCustom];
[aButton setImage:buttonImage forState:UIControlStateNormal];
aButton.frame = CGRectMake(0.0,0.0,buttonImage.size.width,buttonImage.size.height);
[aButton addTarget:self action:#selector(aSelector) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithCustomView:aButton];
self.navigationItem.leftButtonItem = backButton;
Hope it helps...
Edit:
Try this...
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"yourimage.jpg"] style:UIBarButtonItemStyleBordered target:self action:#selector(aSelector)];
self.navigationItem.leftBarButtonItem = backButton;
I don't remember what type of button is the backbutton, try to change the default style to other. Good luck!
Just create a custom barbuttonitem and customize it with a picture similar to the back button item.
You can get its text from the view controllers in the navigation stack.
Then handle the taps to implement the desired effect
You can assign your custom views as the bar buttons to your navigation controller, like this:
UIBarButtonItem *customItem = [[UIBarButtonItem alloc] initWithCustomView:yourCustomizedControl];
[yourCustomizedControl release];
self.navigationItem.leftBarButtonItem = customItem;
[customItem release];
Check this Apple documentation for a more detailed explanation, if you want.
Here is a hack to add a back-like button:
UINavigationItem* backNavigationItem = [[UINavigationItem alloc] initWithTitle:#"Back"];
[_navigationBar pushNavigationItem:backNavigationItem animated:NO];
[backNavigationItem release];
You can add more items (such like title, right button) this way:
UINavigationItem *navigationItem = [[UINavigationItem alloc] initWithTitle:#"Title"];
navigationItem.rightBarButtonItem = // Some UIBarButtonItem
[_navigationBar pushNavigationItem:navigationItem animated:NO];
[navigationItem release];