Im new in objective c.
I have this method, and i want it to load a new view, in the end, from my storyboard. How can i do that?
- (void)stopAnimatingAndLoadView {
[self.indicator stopAnimating];
// load new view
}
Hope you understand my question
The new view that you want to load, I assume, is a UIViewController and you have already set it up in storyboard. In storyboard, if you give it an identifier, then you can load it by calling:
MyOtherViewController *myOtherViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"MyOtherViewController"];
// If you are using navigation controller, you can call
[self.navigationController pushViewController:myOtherViewController animated:YES];
// If not, you can present it modally
[self presentModalViewController:myOtherViewController animated:YES];
Related
i have a UIViewController with UITableView, when the tableView is empty i want to show another view so i am using this
[self.tableView setHidden:YES];
NoKidsViewController *noKids = [self.storyboard instantiateViewControllerWithIdentifier:#"NoKidsView"];
[self.view addSubview:noKids.view];
all is fine, i'm able to see the view. but when i tap on one of the buttons in it i'm getting the EXC_BAD_ACCESS EXC_I386_GPFLT error.
//NoKidsViewController
- (IBAction)addNewKid:(id)sender {
AddKid *addKidController = [self.storyboard instantiateViewControllerWithIdentifier:#"AddKid"];
[self.navigationController pushViewController:addKidController animated:YES];
}
- (IBAction)saleSpot:(id)sender {
SaleSpot *saleSpotController = [self.storyboard instantiateViewControllerWithIdentifier:#"AddKid"];
[self.navigationController pushViewController:saleSpotController animated:YES];
}
i searched the net over 3 hours trying to find any solution w/o success. what could cause that error? and how can i fix it?
The noKids controller is going out of scope and being deallocated. This is what is often referred to as a zombie object.
You need to add the noKids controller to the childViewControllers of the containing controller.
NoKidsViewController *noKids = [self.storyboard instantiateViewControllerWithIdentifier:#"NoKidsView"];
[self addChildViewController:noKids];
[self.view addSubview:noKids.view];
[noKids didMoveToParentViewController:self];
This will retain the NoKidsViewController as well as allow the view controller methods to pass down to it. For more information on creating your custom container view controller:
https://developer.apple.com/library/ios/featuredarticles/ViewControllerPGforiPhoneOS/CreatingCustomContainerViewControllers/CreatingCustomContainerViewControllers.html
So I'm making an iPad app for the very first time and right now I have one view controller with its buttons displayed on the storyboard and everything and what I want to do is when I click on a certain button, it brings me to a new screen.
So I created a second viewcontroller class for the second screen and I created an IB Action method for the button but it's empty because I don't know how to implement it. So what do I have to do to accomplish this?
Try it....
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
// iPad-specific interface here
LBAlertLoginViewController *lbAlertLoginVc = [[LBAlertLoginViewController alloc]initWithNibName:#"LBAlertLoginViewController_iPad" bundle:nil];
[self.navigationController pushViewController:lbAlertLoginVc animated:YES];
[lbAlertLoginVc release];
}
else
{
// iPhone and iPod touch interface here
LBAlertLoginViewController *lbAlertLoginVc = [[LBAlertLoginViewController alloc]initWithNibName:#"LBAlertLoginViewController_iPhone" bundle:nil];
[self.navigationController pushViewController:lbAlertLoginVc animated:YES];
[lbAlertLoginVc release];
}
Hope i helped.
I'm trying to make a modal view controller in my app delegate (I created a function called showLoginView). But whenever I try to call it I get a warning in XCode:
Warning: Attempt to present <PSLoginViewController: 0x1fda2b40> on <PSViewController: 0x1fda0720> whose view is not in the window hierarchy!
Here's the method code:
- (void)showLoginView
{
PSLoginViewController *loginViewController = [[UIStoryboard storyboardWithName:#"MainStoryboard" bundle:NULL] instantiateViewControllerWithIdentifier:#"PSLoginViewController"];
[self.window.rootViewController presentViewController:loginViewController animated:NO completion:nil];
}
How can I add the view to the window hierarchy? Or maybe I'm doing something very wrong?
You can't display a modal view controller from the appDelegate. You need to display a modal ViewController from whichever viewController is currently displaying full-screen. In other words, you need to put that code into your root view controller, or whichever one you want to display the modal vc from...
Also, you'll want to use the method "presentModalViewController" to present the modal. You can set properties on the modal vc such as:
vC.modalPresentationStyle = UIModalPresentationFormSheet;
vC.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
[self presentModalViewController:vC animated:YES];
You can actually present a modal view Controller from the AppDelegate as long as you detect the current visible viewController and take care of the case where you current controller is a navigationController.
Here is what I do:
UIViewController *activeController = [UIApplication sharedApplication].keyWindow.rootViewController;
if ([activeController isKindOfClass:[UINavigationController class]]) {
activeController = [(UINavigationController*) activeController visibleViewController];
}
[activeController presentModalViewController:loginViewController animated:YES];
UIViewController *activeController = [UIApplication sharedApplication].keyWindow.rootViewController;
if ([activeController isKindOfClass:[UINavigationController class]])
{
activeController = [(UINavigationController*) activeController visibleViewController];
}
else if (activeController.modalViewController)
{
activeController = activeController.modalViewController;
}
[activeController presentModalViewController:vc animated:YES];
I ran into this problem on iOS 7 - the key to making any of the proposed solutions work was to call
[self.window makeKeyAndVisible];
in your AppDelegate.
After that call, presenting a modal view from the window's rootViewController worked.
Another reason for that warning can be that you want to present a view controller from an instance which is not the top most view controller.
So first you have to get the topmost UIViewController and using this instance to call presentViewController:
UIViewController *root = [UIApplication sharedApplication].keyWindow.rootViewController;
while (root.presentedViewController) {
root = root.presentedViewController;
}
You can NSLog(#"%#", self.window.rootViewController), and see what the rootViewController really is.
I came into this problem, when the rootViewController is a normal UIViewController.
Replace it with a UINavigationController, wish it will help.
Faced this issue while trying to present controller from the call of delegate of other controller . i.e : show search filter with delegate , once done back to my controller and receive data via the delegate then present controller , all I had to do is to dispatch the present code cause while in a delegate you're in another thread , that's why you're presenting on your view from main thread another controller from that other thread , so have to go back to main thread , just put the presenting code like this :
dispatch_async(dispatch_get_main_queue(), ^{
[self presentViewController:searchVC animated:true completion:nil];
});
Hope this helps !
I have an RSS parser in a UITableView that pushes to the detail view when one of the rows is selected. I had it working fine in the old UI format of using Nib files, but I wanted to transfer everything to UIStoryboard. I learned that UIStoryboards and nibs were compatible, so I decided I would keep the same code, but put the UITableView in the UIStoryboard and have the detail view be its own nib. I linked everything up and it should be working, and its not giving me any errors, but its not. Is there anything that I missed, or are storyboards and nibs not compatible at all.
Edit:
- (id)initWithItem:(NSDictionary *)theItem {
if (self == [super initWithNibName:#"RssDetailController" bundle:nil]) {
self.item = theItem;
self.title = [item objectForKey:#"title"];
}
return self;
}
Are you pushing from a UIViewController in UIStoryboard to a NIB file?
If so check out this sample project that pushes from storyboard to a NIB:
// in a navigation controller
// to load/push to new controller use this code
// this will be next screen
DetailsViewController *detailsViewController = [[DetailsViewController alloc ]init];
[self.navigationController pushViewController:detailsViewController animated:YES];
// to go back or pop controller use this
// now it will send back to parent screen
[self.navigationController popViewControllerAnimated:YES];
this is a newbie question.i ve created a grouped tableview .on clicking the tableview cell it navigates to a new view.but i m unable to create a back button.I even added a navigation bar in the second view of the nib file.but its of no effect..could you guys help me out..below is the screenshot and code of the first view
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Navigation logic may go here. Create and push another view controller.
if (indexPath.row==0) {
self.dvController1 = [[FirstView alloc] initWithNibName:#"FirstView" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:dvController1 animated:YES];
}
if (indexPath.row==1) {
self.dvController2 = [[Tab4 alloc] initWithNibName:#"Tab4" bundle:[NSBundle mainBundle]];
[self.navigationController pushViewController:dvController2 animated:YES];
}
}
In the presented controller add a button with an IBAction in it:
- (IBAction)back:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
}
And make sure that you have a navigationController indeed (meaning that your application needs to be navigation oriented, meaning that you need to instantiate the navigationController property in the application delegate)
In your second view .put this code in viewDidLoad method
self.navigationItem.leftBarButtonItem.title = #"Back";
just hide the bar in the viewWillAppear method & unhide the bar in viewWillDisAppear methods of the tableViewController class. By using
self.navigationController.navigationBarHidden = YES/NO;