So I have a settings bar button item in my navigation controller which, when pressed from a home view controller, opens a settings vc transparent view over the home vc, so the home vc is still visible behind the settings vc. I want the nav bar to still show, so in the "HomeViewController.h"I have the following code :
-(IBAction)settingsButtonPressed:(id)sender{
SettingsViewController *settings = [[SettingsViewController alloc]init];
[self.navigationController.view addSubview:settings.view];
}
When I want to remove the settings view, in "SettingsViewController" I tried doing :
-(IBAction)exitSettings:(id)sender{
[self.navigationController.view removeFromSuperview];
}
But when I do this and try to run the program, the program stops, and in the debug area, it just says
Thread 1: EXC_BAD_ACCESS (code = 2, address=0xb0000008)
(lldb)
What am I doing wrong and how can I fix this???
Here crash occurred because of this code:
[self.navigationController.view removeFromSuperview];
You are trying to remove the navigationController view not the settings view.
When you add the SettingsViewController add a tag to it:
-(IBAction)settingsButtonPressed:(id)sender
{
SettingsViewController *settings = [[SettingsViewController alloc]init];
settings.view.tag = 7;
[self.navigationController.view addSubview:settings.view];
}
And use this tag to remove the view from the navigationcontroller:
-(IBAction)exitSettings:(id)sender
{
[[self.navigationController.view viewWithTag:7] removeFromSuperview];
}
for (UIView *view in self.navigationController.view.subviews)
{
if ([view isKindOfClass:[SettingsViewController class]])
{
[view removeFromSuperview];
}
}
-(IBAction)exitSettings:(id)sender
{
[vc dismissModalViewControllerAnimated:YES];
}
vc is your ViewController Object.
try this one.
Related
I have a TabBar class named GTabBar and it's items are define on AppDelegate class. The TabBar show in the 1st Xib. When I click a button then move to the another Xib. When it move to anther Xib I need to hide the TabBar. So how can I do that? Please answer with a example code.
try this
-(void)viewWillDisappear:(BOOL)animated {
tabBarHolder.hidden = YES;
[super viewWillDisappear:animated];
}
or try this
UIViewController *newView = [[show_list_inhabitants alloc] initWithNibName:#"show_list_inhabitants" bundle:nil];
tabBarHolder.hidden = YES;
[self.navigationController pushViewController:newView animated:NO];
I have a trio of functions and a property that I use to control my popovers as follows:
-(void)dismissPopoverIfPresentAnimated:(BOOL)animated
{
if (self.currentPopover)
{
[self.currentPopover dismissPopoverAnimated:animated];
self.currentPopover = nil;
}
}
-(void)presentViewController:(UIViewController *)viewController inView:(UIView *)view fromRect:(CGRect)rect suppressArrow:(BOOL)suppressArrow
{
//Did the user just tap on a button to bring up the same controller that's already displayed?
//If so, just dismiss the current controller.
BOOL closeOnly = NO;
if (self.currentPopover)
{
UIViewController *currentController = [self.currentPopover.contentViewController isKindOfClass:UINavigationController.class] ? ((UINavigationController *)self.currentPopover.contentViewController).topViewController : self.currentPopover.contentViewController;
UIViewController *newController = [viewController isKindOfClass:UINavigationController.class] ? ((UINavigationController *)viewController).topViewController : viewController;
if ([currentController isKindOfClass:newController.class])
closeOnly = YES;
[self dismissPopoverIfPresentAnimated:NO];
}
if (!closeOnly)
{
self.currentPopover = [[UIPopoverController alloc] initWithContentViewController:viewController];
self.currentPopover.backgroundColor = [UIColor whiteColor];
[self.currentPopover presentPopoverFromRect:rect inView:view permittedArrowDirections:(suppressArrow ? 0 : UIPopoverArrowDirectionAny) animated:YES];
}
}
(instancetype) initWithContentViewController:(UIViewController )viewController
{
self = [super initWithContentViewController:[[UIViewController alloc] init]];
if (self)
{
UIViewController contentViewController = super.contentViewController;
[contentViewController addChildViewController:viewController];
[viewController didMoveToParentViewController:contentViewController];
[contentViewController.view addSubview:viewController.view];
[self setPopoverContentSize:viewController.preferredContentSize animated:NO];
}
return self;
}
This runs fine in iOS 7, but in iOS 8 the problem is there is a delay between the call to presentPopoverFromRect and when the item actually shows up onscreen. So, if a user double taps a button to show a popover, the first tap will properly dismiss, then "start" the showing of the new controller. The second tap will make the dismiss call (the popover is not yet visible) and then not show the new controller (this is a design feature so that click a button will show a popover, clicking it again will hide it).
The problem is that the call to dismiss the popover doesn't actually work and the popover will show up. At that point I can't get rid of it because my property is nil and I think it is not showing.
My guess is this is an iOS 8 bug where the dismiss somehow doesn't see a visible popover and thus doesn't do anything, where instead, it should prevent it from showing up.
Oh, one last note is that the call to presentViewController is always done on the main thread.
I have 6 view controllers when my app starts. It's like an image gallery. When a user pushes for example the button on the third view, he/she should gets to the third view in the tab bar.
I use this code to launch the view controllers on the top of the tab bar controller:
- (void)viewDidAppear:(BOOL)animated {
static BOOL first = YES;
if (first) {
UIViewController *popup = [[Home1ViewController alloc] initWithNibName:#"Home1ViewController" bundle:nil];
[self presentViewController:popup animated:NO completion:nil];
first = NO;
}
}
By using this code to dismiss this new view, I'm just coming to the specific view, but not my tab-bar page...
-(IBAction)dismissView {
TabBarPage3 *screen = [[ TabBarPage3 alloc] initWithNibName:nil bundle:nil];
screen.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController:screen animated:YES];
}
Please help me with this!
Thanks
This is the code for change view on TabBar
[((UITabBarController *)(self.parentViewController))setSelectedIndex:index];
Sample Project of UITabbar
I'm confused. I have a navigation controller with a BarItem which opens a first view. After some work is done, I want this view to disappear and I want a second view to open.
root view: navigation controller
first view: activity indicator, where some data is put together
second view: MFMailComposeViewController
In the root view, the BarItem runs these lines to open the first view:
IndicatorViewController *indicator = [[IndicatorViewController alloc] initWithNibName:#"IndicatorViewController" bundle:nil];
indicator.view.backgroundColor = [UIColor clearColor];
self.modalPresentationStyle = UIModalPresentationCurrentContext;
[self presentModalViewController:indicator animated:YES];
The first view (IndicatorViewController) does some work and finally runs
[self dismissModalViewControllerAnimated:YES];
This works fine. But - how do I open the second view?
I tried this:
I open the second view. After closing the second view, my first view pops up again (since it is still there) and get's dismissed at this point. This code is placed in the first view:
- (void) viewDidAppear:(BOOL)animated {
static BOOL firstTime = YES;
if (firstTime) {
//do stuff that takes some time (that's why I show the indicator)
MailViewController *controller = [[MailViewController alloc] init];
if (controller)
[self presentModalViewController:controller animated:YES];
firstTime = NO;
} else {
[self dismissModalViewControllerAnimated:YES];
}
}
Since the first view pops up again, the user can see the indicator one more time, after the second view is closed - and that is not what I want.
What am I missing here? What would be the better way to do this?
I would do something like this. Make a navigationController, and make the first view as the root controller. Then do something like this:
FirstView.m
- (void)viewDidLoad
{
[super viewDidLoad];
[self.navigationController setNavigationBarHidden:YES];
}
- (void) nextView { // however you get to your next view, button/action/etc.
UIViewController *screen = [self.storyboard instantiateViewControllerWithIdentifier:#"yourIdentifier"];
[self.navigationController pushViewController:screen animated:YES];
}
Then in the second view:
SecondView.m
- (void) nextView { // however you get to your next view, button/action/etc.
UIViewController *screen = [self.storyboard instantiateViewControllerWithIdentifier:#"yourIdentifier"];
[self.navigationController pushViewController:screen animated:YES];
}
And finally in the rootview:
RootView.m
- (void)viewDidLoad
{
[super viewDidLoad];
NSArray *navStack = [NSArray arrayWithObject:self];
self.navigationController.viewControllers = navStack;
[self.navigationController setNavigationBarHidden:NO];
}
This will make your RootView the new rootview of the NavigationController.
self.navigationController.viewControllers
is the array with all the ViewControllers that are on the navcontrollers stack. The first object is the rootcontroller. If we replace the whole array with our own array, it knows only one item. You CAN go back by dismissing if that's what you want though. This isn't the prettiest way of doing it, but it's not the worst either.
I am new to iPhone programming. what I am trying is I have one screen with a button. And I want to change the view controller not only the view when I click that button (I know how to add subview) because from that 2nd view controler, I have to go to the third view which is not possible if I add subview in first place. Can anybody please help me with that? Is this possible? and if yes, how? All the views and view controller are created programmaticaly. I am not using IB.
EDIT: here is the relevant code that fires when clicking button
-(id)showCurrentLoc:(id)sender {
locationController = [currentLocController alloc];
[entry removeFromSuperview];
[newLoc removeFromSuperview];
[currentLoc removeFromSuperview];
[self.view setBackgroundColor:[UIColor clearColor]]; //[self.view addSubview: [locationController view]];
[self.navigationController pushViewController:locationController animated:YES]; [locationController release];
return 0;
} //Location Controller is the tableViewController
Thanks
Vik
You can do something like this
YourViewController *objYourViewController = [[YourViewController alloc] initWithNibName:#"YourViewController" bundle:nil];
[self.navigationController pushViewController:objYourViewController animated:YES];
[YourViewController release];
Usually, you use a navigation controller for this sort of thing so that the user can easily go back to the previous view. Your view controller would then do something like this:
[self.navigationController pushViewController:someNewViewController animated:YES];
If you want to manage the view controllers yourself, you can always just change the window's rootViewController property. Please read View Controller Programming Guide for the complete picture.
UINavigationController is what you need. It manages a stack of UIViewControllers and if you want to add new UIViewController just push it into this navigation stack. It automates back button behavior for you, and you can pop your current UIViewController from stack whenever you are done with it.
You could work with a UINavigationController. Adding your first UIViewController like this in the init method:
[self setViewControllers:[NSArray arrayWithObject:viewController]];
And then when a button is click or a choice is made, your push the second few controller with (in the first viewController):
[self.navigationController pushViewController:controller animated:YES];
This way you will also get an automatic (back button). Basicly you create a stack of UIViewControllers that you can push and pop like with a normal stack.
I hope this helps. Look into the following:
UINavigationController Class Reference
- (void) loadViewAtIndex:(NSInteger)index {
[self unloadViewAtIndex:activeViewIndex];
switch (index) {
case 1:
{
if (viewController1 == nil)
{
viewController1 = [[ViewController1 alloc] initWithNibName:#"ViewController1" bundle:nil];
}
viewController1.view.frame = CGRectMake(0.0, 0.0, viewController1.view.frame.size.width, viewController1.view.frame.size.height);
[window addSubview:viewController1.view];
}
break;
case 2:
{
if (viewController2 == nil)
{
viewController2 = [[ViewController2 alloc] initWithNibName:#"ViewController2" bundle:nil];
}
viewController2.view.frame = CGRectMake(0.0, 0.0, viewController2.view.frame.size.width, viewController2.view.frame.size.height);
[window addSubview:viewController2.view];
}
break;
default:
break;
}
activeViewIndex = index;
}
- (void) unloadViewAtIndex:(NSInteger)index {
switch (index) {
case 1:
{
if (viewController1 != nil)
{
[viewController1.view removeFromSuperview];
[viewController1 release];
viewController1 = nil;
}
}
break;
case 2:
{
if (viewController2 != nil)
{
[viewController2.view removeFromSuperview];
[viewController2 release];
viewController2 = nil;
}
}
break;
default:
break;
}
}