I am new in objective C. I don't know much more things about this. I am practicing on navigation controller. The problem is that whatever methods I am putting in action:#selector in shows SIGABRT error.
could you clarify me which types of methods i can put in action:#selector section.
Though I know it's a silly question but I think these will clear my concept over navigationViewController.
thank you.
- (void)viewDidLoad
{
UISearchBar *search=[[UISearchBar alloc] init];
self.navigationItem.rightBarButtonItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:#selector(searchBarShouldBeginEditing:)];
[super viewDidLoad];
}
- (BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar{
UISearchBar *search=[[UISearchBar alloc] init];
[search resignFirstResponder];
return YES;
}
Try moving your '[super viewDidLoad]' to the beginning of the viewDidLoad method, not the end. YOu need to make sure the controls exist before you add the right bar button item.
Related
In my tableview xib i couldn't be able to show navigation bar on run time? My coding as follows
- (void)viewDidLoad
{
ar=[[NSMutableArray alloc]initWithObjects:#"When im happy..i...",#"When im sad.. i...",#"When i'm mad.i...",#"My worst habbit is....",#"The best thing about me is...",nil];
[super viewDidLoad];
self.title=#"Welcome";
self.navigationItem.leftBarButtonItem=self.editButtonItem;
}
The table view doesnt showing the navigation bar.Please help me out
Are you creating self.editButtonItem?
Use this code:-
[self.navigationItem setRightBarButtonItem:[[[UIBarButtonItem alloc]initWithTitle:#"Test" style:UIBarButtonItemStyleBordered target:self action:#selector(test:)]autorelaese]];
I've been trying to learn the new Storyboard feature in Xcode and I've run into a problem with trying to set a UITableView to edit mode.
So far my storyboard looks like this:
NavigationController -> UIViewController (subclass with tableview property)
I added a Navigation Item and a Bar Button item to the view controller scene, so I do see an edit button. It didn't do anything automagically, so I tried linking it's selector to the setEditing method of the tableview delegate. This did put it into editing mode. However, the edit button did not change to a "Done" button and so there is no way to get out of editing mode.
Do I have to create another Navigation item for the Done button? How do I connect it so that it appears at the right time and works correctly?
I think that also with Storyboard, the only way (for sure, the easiest one) to implement a working edit/done button, is to use the following code:
- (void)viewDidLoad
{
[super viewDidLoad];
...
//set the edit button
self.navigationItem.leftBarButtonItem = self.editButtonItem;
...
This is the solution that Apple itself implements if you select a "Master-Detail Application" template for your project.
Probably Storyboard is still not perfect, and hopefully it will be improved from Apple in next releases...
I just started using Storyboards, so I also wanted to use the Storyboard to add my Edit button. It is annoying to have taken the time to learn how to use a new tool but find you need a roll of duct tape to patch up the holes.
You can get it to work, but need to add a Custom button. In the Attributes inspector make sure the Identifier is Custom and the title is Edit.
Then add something like this in your .m
- (IBAction)setEditMode:(UIBarButtonItem *)sender {
if (self.editing) {
sender.title = #"Edit";
[super setEditing:NO animated:YES];
} else {
sender.title = #"Done";
[super setEditing:YES animated:YES];
}
}
Have your Custom Edit button call the setEditMode method.
Can only hope they will fix the implementation of the Edit button in the Storyboard editor in the future.
To summarize:
The Button, returned by UIViewController.editButtonItem is a special toggling button with special behavior that calls - (void)setEditing:(BOOL)editing animated:(BOOL)animated if pressed.
The Button, returned by UINavigationController.editButtonItem is a simple Button, just labeled with "Edit".
The Storyboard allows to select the latter one.
If you are using the navigation controller to push to the view controller, simply set self.navigationItem.rightBarButtonItem = self.editButtonItem;, which will put the default Edit button in the right. If the navigation bar is not visible, call self.navigationController.navigationBarHidden = NO;. Those would be called in the viewDidLoad method, or something similar. Then in order to get the tableView to respond to the edit call, use the following method:
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
[super setEditing:editing animated:animated];
[tableView setEditing:editing animated:animated];
}
That should do what you want it to do. If you have any issues, just say so and we can narrow down the details
To add to #Graham answer, you might also want to change the style so you can have the "Done" button style (the blue color). Something like this:
- (IBAction)setEditMode:(UIBarButtonItem *)sender {
if (self.editing) {
sender.title = #"Edit";
sender.style = UIBarButtonItemStylePlain;
[super setEditing:NO animated:YES];
} else {
sender.title = #"Done";
sender.style = UIBarButtonItemStyleDone;
[super setEditing:YES animated:YES];
}
}
one can use the dumb, not working Edit button from the Storyboard editor and then programmatically replace it with the UIViewController.editButtonItem.
in viewDidLoad:
NSMutableArray *toolbarItems = [NSMutableArray arrayWithArray:self.toolbarItems];
[toolbarItems replaceObjectAtIndex:0 withObject:self.editButtonItem];
[self setToolbarItems:toolbarItems];
this code assumes one has added the dumb Edit button as the leftmost item on the toolbar in the Storyboard.
In case that you have UIViewController and inside this you added a UITableVIew.
If you want to add an edit UIBarButton in order to interact with UITableView, try:
Add this line...
- (void)viewDidLoad
{
[super viewDidLoad];
...
self.navigationItem.leftBarButtonItem = self.editButtonItem;
...
}
and this method
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
[super setEditing:editing animated:animated];
[self.myListTableView setEditing:editing animated:animated];
if(self.myListTableView.editing) {
NSLog(#"editMode on");
} else {
NSLog(#"editMode off");
}
}
where
#property (weak, nonatomic) IBOutlet UITableView *myListTableView;
I don't get a call to my eventViewController:didCompleteWithAction: when the EKEventViewController finishes edting an event.
Here's how I set it up:
- (void)showCalendar:(id)sender {
EKEventViewController *eventViewController = [[EKEventViewController alloc] init];
eventViewController.delegate = self;
eventViewController.event = self.event;
// Allow event editing.
eventViewController.allowsEditing = YES;
[self.navigationController pushViewController:eventViewController animated:YES];
[eventViewController release];
}
I do have the protocol on my class and the method was implements by copy and pasting the definition from the docs. It just doesn't get called.
If I use the EKEventEditViewController and its corresponding delegate, then that does get called when the event is saved.
I was able to reproduce the problem in the SimpleEKDemo code same as well. Does anyone know what might be wrong?
I could just drop the view functionality and go straight to the EKEventEditViewController, but I'd rather not.
Might be a bit late to be helpful, but I had this problem as well.
To get around it I subclassed EKEventViewController, then in the subclass' viewDidLoad I replaced the standard edit button with one of my own:
- (void)viewDidLoad {
[super viewDidLoad];
UIBarButtonItem *editItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self.delegate action:#selector(editCalEvent)];
self.navigationItem.rightBarButtonItem = editItem;
}
That way when you want to edit an event, you can set up your own EKEventEditViewController and specify its delegate in order to respond to changes:
- (void)editCalEvent {
EKEventEditViewController *editController = [[EKEventEditViewController alloc] init];
editController.event = editingEvent;
editController.eventStore = self.eventStore;
editController.editViewDelegate = self;
[self presentModalViewController:editController animated:YES];
[editController release];
}
Hope that helps.
I had the similar problem when I use "pushViewController", the result is that it will go to
- (void)navigationController:(UINavigationController *)navigationController
willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{}
But after I changed to presentModalViewController, it will go to eventViewController:didCompleteWithAction: when Done/Cancel/Delete are pressed.
in this .m file you need to import the EventKit/EventKit.h and EventKitUI/EventKitUI.h
and in the .h file you need to implement the 'EKEventViewDelegate' delegates.
hope it helps you
This does seem to be a fairly obvious omission in the library. My workaround: I'm presenting the EKEventViewController in a UINavigationController. I detect completion in the viewWillAppear method of the controller than pushed the EKEventViewController onto the view stack. Use a boolean variable in this view controller to track and differentiate between initial appearance and re-appearance due to the EKEventViewController being popped. There is a risk that your code will get called at other times, but if you are just refreshing tableviews, etc, then this should be sufficient.
I have a problem with switching views in an iPhone application.
I have the source code of "Beginning iPhone 3 Development" (http://books.google.com/books?id=TcP2bgESYfgC&printsec=frontcover&dq=beginning+iphone+3+development#v=onepage&q=beginning%20iphone%203%20development&f=false) - chapter 6 - Multiview Applications.
Now I have the problem, I want to create a new view which should switch by clicking the button on the blue screen "Press me". But it did not work.
I add the these lines to the IBAction that the button on the blue screen is pressed:
StartViewController *startController = [[StartViewController alloc] initWithNibName:#"StartViewController" bundle:nil];
self.startViewController = startController;
[self.view insertSubview:startController.view atIndex:1];
[startController release];
But the toolbar at the bottom won't disappear. But I want that this toolbar disappear.
If I wrote
[self.view insertSubview:startController.view atIndex:0];
instead of
[self.view insertSubview:startController.view atIndex:1];
the new xib lies behind the old one, so I see both views, the old and the new.
Why? I do not understand this.
Thanks a lot in advance & Best Regards Tim
The toolbar is in the SwitchView so you would need to hide it from the view if you want it to hide. You could make an IBOutlet for the toolbar and then call setHidden:(BOOL) to hide it. You will need to do this from BlueViewController so you will need a way to get to your super view (which is SwitchView). You will also need to remove the BlueView from the super view by calling removeFromSuperView on blueViewController before inserting the new view into place. It is basically the same code that comes from the switch button in SwitchViewController.
Update:
I looked at your code. In BlueViewController.m use this for blueButtonPressed:(id)sender
StartViewController *start = [[StartViewController alloc] initWithNibName:#"StartViewController" bundle:nil];
self.startViewController = start;
[start release];
View_SwitcherAppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
SwitchViewController *switchController = appDelegate.switchViewController;
switchController.theToolbar.hidden = YES;
[self.view removeFromSuperview];
[self.view insertSubview:startViewController.view atIndex:0];
You will also need to add these two imports for "View_SwitcherAppDelegate.h" and "SwitchViewController.h".
I am a newbie iPhone Programmer and have a question regarding how to access methods of a Parent View Controller.
In my program when the program first loads (applicationDidFinishLaunching) I do the following code:
[window addSubview:rootViewController.view];
[window makeKeyAndVisible];
which basically calls this
- (void)viewDidLoad {
HomeViewController *homeController=[[HomeViewController alloc] initWithNibName:#"HomeView" bundle:nil];
self.homeViewController=homeController;
[self.view insertSubview:homeController.view atIndex:0];
[homeController release];
[super viewDidLoad];
}
Now, I have an IBAction call on HomeViewController that I want to have it call a method in root View Controller
I want to call this method
- (void)loadNewGame
{
self.questionViewController = [[QuestionViewController alloc] initWithNibName:#"QuestionView" bundle:nil];
//[homeViewController.view removeFromSuperview];
[self.view insertSubview:questionViewController.view atIndex:0];
}
So my question is how do I call a method from the Parent View controller?
I've tried
[self.view removeFromSuperview];
[self.parentViewController loadNewGame];
but that doesn't seem to work. Could someone please ploint me in the right direction.
Thanks in advance
Scott
First off, typically you call [super viewDidLoad] first in your viewDidLoad.
You will have to have an instance variable in your homeController class for your rootViewController. Then you could have a method in homeController:
- (void) loadNewGame
{
[self.rootViewController loadNewGame];
}
This is one of many different ways to accomplish this. You may want to move the method to homeController completely. Or you may wish to have IB use the rootViewControllers' methods directly...
Here is another discussion of this.
First off your code doesn't really make sense. Why are you adding your HomeViewController in a -viewDidLoad call. If you want to load the HomeViewController as the initial view, you should set that in Interface Builder instead of RootViewController. When you want to display a new view controller, you should be using a navigation controller stack and pushing the new view controller onto it with [[self navigationController] pushViewController:newViewController animated:YES].
Assuming you get that sorted, you should create a delegate (id) field for your child view controller that you can set when you instantiate the new view controller. So your code might look something like this:
HomeViewController *homeController=[[HomeViewController alloc]
initWithNibName:#"HomeView" bundle:nil];
[homeController setDelegate:self];
[[self navigationController] pushViewController:homeController animated:YES];
[homeController release];
Then, when your action gets fired in the HomeViewController, you can check to see if the delegate is set and if so, call the selector in question, like this:
- (IBAction)action:(id)sender;
{
if (delegate && [delegate respondsToSelector:#selector(loadNewGame)])
[delegate performSelector:#selector(loadNewGame)];
}
You might want to read Apple's docs on how to use the navigation controller stack. This might help clarify some things.