I have a tab-based application. In SecondViewController, there is a UITableView with several cells. When you swipe on a cell, you are sent to another view controller, speciesController. The below code works to send the app to another view, and it does set up a navigation bar, but there is no back button.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
SpeciesViewController* speciesController = [[SpeciesViewController alloc]initWithNibName:#"SpeciesViewController" bundle:nil];
Species *theSpecies = [fetchedResultsController objectAtIndexPath:indexPath];
speciesController.theSpecies = theSpecies;
switch (sortBySegmentedControl.selectedSegmentIndex) {
case kSortByCommonNameFirst:
speciesController.title = [theSpecies commonNameFirstLast];
break;
case kSortByCommonNameLast:
speciesController.title = [theSpecies commonNameLastFirst];
break;
case kSortByScientificName:
speciesController.title = [[NSString alloc] initWithFormat:#"%#%#",
[theSpecies.scientificName substringToIndex:1],
[[theSpecies.scientificName substringFromIndex:1] lowercaseString]];
break;
default:
break;
}
speciesController.hidesBottomBarWhenPushed = YES;
//self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:nil action:nil];
//// Store current index path for viewDidAppear animation. ////
self->currentSelectedIndexPath = indexPath;
UINavigationController *navBar=[[UINavigationController alloc]initWithRootViewController:speciesController];
navBar.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:nil action:nil];
[self presentViewController:navBar animated:YES completion:nil];
}
I realize that to have a backbutton, you need to push the current view onto the navigation controller stack. However, changing
navBar.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:nil action:nil];
[self presentViewController:navBar animated:YES completion:nil];
to
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:nil action:nil];
[self.navigationController pushViewController:navBar animated:NO];
Doesn't work. In fact, the app fails to change to a different view, and I believe this is because there is no self.navigationController
I tried to add/initialize one with this line:
UINavigationController *navigationController=[[UINavigationController alloc]initWithRootViewController:self];
but that caused the application to crash.
I appreciate any information about adding a navigation controller to an app (in storyboard or programatically). I'm afraid most of the examples I saw were outdated, from 2011 or so with methods like self.window addSubview...
Thank you!
Instead of having SecondViewController as a Tab Item, set that Tab Item to a Navigation Controller with SecondViewController as its Root VC.
Then, on didSelectRowAtIndexPath, all you have to do is:
[self.navigationController pushViewController: speciesController animated:YES];
The "back button" will automatically be there.
after
UINavigationController *navBar=[[UINavigationController alloc]initWithRootViewController:speciesController];
try
speciesController.navigationController.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:nil action:nil];
if (self.navigationController)
[self.navigationController pushViewController:navBar animated:NO];
else
[self presentViewController: navBar animated:YES completion:nil];
Related
I'm presenting my view controller with the following code:
UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:sessionController];
[self presentViewController:navigation animated:YES completion:^{
}];
In the "viewDidLoad" method of my presented view controller I'm attempting to set the "back button" as follows:
UIBarButtonItem *newBackButton =
[[UIBarButtonItem alloc] initWithTitle:#"Test"
style:UIBarButtonItemStyleBordered
target:nil
action:nil];
[self.navigationController.navigationItem setBackBarButtonItem:newBackButton];
Silent failure, no exception, no log, no error, and NO button. Any thoughts would be much appreciated!
You can try:
self.navigationItem.leftBarButtonItem = newBackButton
In my app I have two tabs that handle different set of functions.
One tab is the user tab, when the user switch to this tab, the tab controller checks whether the user has logged in. If not, it shows a button(LoginBtn) which triggers a log in view controller to show when tapped.
I intend to present the log in controller modally with a navigation bar.
However, the navigation bar is not showing the right button item although I've initiated it.
Here's the code
- (void)clickLoginBtn{
LogginController* _cLogginController = [[LogginController alloc] init];
UINavigationController *_cNavController = [[UINavigationController alloc] initWithRootViewController:_cLogginController];
_cNavController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"取消" style:UIBarButtonItemStylePlain target:self action:#selector(dismissLoginView)];
[_cNavController.navigationItem.rightBarButtonItem setTintColor:kColorWhite];
_cNavController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentViewController:_cNavController animated:YES completion:nil];
}
What could be the problem? Is it possible that is because I present to controller modally?
You have put your buttons to the login controller:
_cLogginController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"取消" style:UIBarButtonItemStylePlain target:self action:#selector(dismissLoginView)];
You shouldn't add navigation items to the navigation controller.
try this code.I think this issue is solved by this code
- (void)clickLoginBtn{
LogginController* _cLogginController = [[LogginController alloc] init];
_cLogginController .hidesBottomBarWhenPushed=No;//You need to add this line
UINavigationController *_cNavController = [[UINavigationController alloc] initWithRootViewController:_cLogginController];
_cNavController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"取消" style:UIBarButtonItemStylePlain target:self action:#selector(dismissLoginView)];
[_cNavController.navigationItem.rightBarButtonItem setTintColor:kColorWhite];
_cNavController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentViewController:_cNavController animated:YES completion:nil];
}
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
DemoViewController * _cLogginController = [[DemoViewController alloc]init];
_cLogginController = [storyboard instantiateViewControllerWithIdentifier:#"DemoViewController"];
_cLogginController .hidesBottomBarWhenPushed = NO;
UINavigationController *_cNavController = [[UINavigationController alloc]initWithRootViewController:_cLogginController];
_cNavController.navigationItem.rightBarButtonItem.tintColor = [UIColor blueColor];
_cNavController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
_cLogginController.navigationItem.title = #"取消";
UIBarButtonItem *flipButton = [[UIBarButtonItem alloc]
initWithTitle:#"Flip"
style:UIBarButtonItemStyleBordered
target:self
action:#selector(flipView:)];
flipButton.tintColor = [UIColor grayColor];
_cLogginController.navigationItem.rightBarButtonItem = flipButton;
[self presentViewController:_cNavController animated:YES completion:nil];
i use storyboard for developing UI for my project. There are many issues were solved, but this problem killing me. I have added action for UIBarButtonItem :
- (IBAction)pressAddActionButton:(UIBarButtonItem *)sender {
if (_mode == itemSelect) {
LookUpTableViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:#"lookupTable"];
vc.key = #"title";
vc.data = [Linesheet MR_findAllSortedBy:#"title" ascending:YES];
vc.lookUpDelegate = self;
self.myPopoverController = [[UIPopoverController alloc] initWithContentViewController:vc];
[self.myPopoverController presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
} else {
self.mode = itemSelect;
}
}
If i using storyBoard segue for showing popover - all good, but if i do it in runtime a popover does not show. I should manually create UIBarButtonItem.
Thanks for help!!!
Update, code for buttons:
- (void)setupNavigationItems {
self.navigationController.navigationBarHidden = NO;
UIBarButtonItem *addItem;
if (_mode == itemSelect) {
addItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
target:self
action:#selector(pressAddActionButton:)];
} else {
addItem = [[UIBarButtonItem alloc] initWithTitle:#"Done" style:UIBarButtonItemStyleDone
target:self
action:#selector(pressDoneButton:)];
}
[addItem setStyle:UIBarButtonItemStyleBordered];
UIBarButtonItem *separator = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
target:self
action:nil];
UIBarButtonItem *action = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction
target:self
action:#selector(pressActionButton:)];
[action setStyle:UIBarButtonItemStyleBordered];
[toolbar setItems:[NSArray arrayWithObjects:separator, addItem, action, nil] animated:YES];
}
Make sure you're hitting the code as you expect using a breakpoint on the presentPopoverFromBarButtonItem line. Also, make sure that the myPopoverController property is declared strong if you're using arc, as otherwise it will be nil before the presenting line.
Did you check if LookUpTableViewController *vc actually gets a proper instance? If not then check that your storyboard does have #"lookupTable" set as your controller's identifier.
The code is right. Try replacing the sender with self.navigationItem.leftBarButtonItem or self.navigationItem.rightBarButtonItem. The sender may not be what you are expecting.
Also remove the if (_mode == itemSelect) clause for testing I'm not sure why you need to access the ivar _mode ivar directly.
I have a cameraview from which I'm pushing another view of with TableViewController. I can push the second view from my main view by using navbar controller. But the back button from the second view which is table view does not respond. I can't figure out why.
Thanks in advance.
#WrightCS Thank you for your immediate response.
In my app delegate.
ViewController *vc= [[ViewController alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:vc];
[self.window setRootViewController :navController];
[self.window makeKeyAndVisible];
return YES;
Right now I'm using a temporary button to push the view.
-(IBAction)testButtonPressed {
TableView *tableVC = [[TableView alloc] initWithStyle:UITableViewStylePlain];
[self.navigationController pushViewController:tableVC animated:YES];
}
There are a few reasons your back button may not work:
You are using a custom UIButton and the frame/bounds are not correct you can use [yourButtonName sizeToFit]
to size it properly.
You are adding a button programmatically and not adding a click event:
[yourButtonName addTarget:self action:#selector(yourButtonNameTapped:) forControlEvents: UIControlEventTouchUpInside];
Don't forget your event.
...
-(void)yourButtonNamedTapped:(id)sender
{
...
}
docs: http://developer.apple.com/library/ios/#documentation/uikit/reference/UIControl_Class/Reference/Reference.html
If you are using a UINavigationController, back will automatically show up when you use [self.navigationController pushViewController:viewControllerName];
-(IBAction)testButtonPressed {
TableView *tableVC = [[TableView alloc] initWithStyle:UITableViewStylePlain];
UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:nil action:nil];
self.navigationItem.backBarButtonItem = backBarButtonItem;
[backBarButtonItem release];
[self.navigationController pushViewController:tableVC animated:YES];
}
I think it will be helpful to you.
- (void)viewDidLoad
{
UIBarButtonItem *backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Back" style:UIBarButtonItemStylePlain target:self action:#selector(backButtonDidClicked:)];
self.navigationItem.backBarButtonItem = backBarButtonItem;
[backBarButtonItem release];
}
-(void)backButtonDidClicked :(id)sender
{
[self.navigationController popViewControllerAnimated:YES];
}
It should work for you!!
I got a navigation controller that has a "Done" button. When the user is finished with the form, they press "Done" and I want that view popped off the stack and back at the main menu.
Here is the code I got so far:
UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:#"Done"
style:UIBarButtonItemStylePlain
target:self
action:[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES]];
self.navigationItem.rightBarButtonItem = anotherButton;
Please help! Thank you
How about you try this:
UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:#"Done"
style:UIBarButtonItemStylePlain
target:self
action:#selector(onClickOfDone);
self.navigationItem.rightBarButtonItem = anotherButton;
Now write the popViewController logic in the method named onClickOfDone
- (void)onClickOfDone {
[self.navigationController popViewControllerAnimated:YES];
}
If your pop is only one level back then the above code would help. If you want to specifiy the controller to which it has to pop to, then you can use
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES]
EDIT:
You could also use the SystemItem for Done:
UIBarButtonItem *aDoneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
target:self action:#selector(onClickOfDone)];
self.navigationItem.rightBarButtonItem = aDoneButton;
[aDoneButton release];
1) Define new method of the class that corresponds to self. Fro example,
- (void)closeView
{
[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:YES];
}
2) Set appropriate selector when creating your button:
UIBarButtonItem *anotherButton = [[UIBarButtonItem alloc] initWithTitle:#"Done"
style:UIBarButtonItemStylePlain
target:self
action:#selector(closeView)];
self.navigationItem.rightBarButtonItem = anotherButton;
[anotherButton release]; // and don't forget to clear memory
Your code is correct just make one function and inside that function write popping code, then call that function using #selector in action.