I want to ask a question about the iPhone application. I write a program which will display a table. However, I don't know why I cannot display the navigation title in the table. The following is my code
// code
- (void)viewDidLoad {
[super viewDidLoad];
// control flow, call another user define function and add the items to the table
[self flowControl];
//Set the title
self.navigationItem.title = #"Table Title Hello";
// can see
// NSLog(#"self.navigationItem.title: %#", self.navigationItem.title);
}
The table can only display the item but not the title. Can any one help me?
// ---------- Update 1 --------------
The code in the [self flowControl] will call two functions, both of the function is to add the items, e.g [displayNameArray addObject:#"John Chan"];
// ---------- Update 2 ---------------
In my program, the are 2 view controllers.
1) MyViewController
2) SimpleTableView
The first one is used to let the user to enter the information, the second one is used to display the content in table format.
My project name is USERPROJECT
//The following is the content of the .m
#import "MyViewController.h"
#import "USERPROJECT.h"
#import "SimpleTableView.h"
#implementation USERPROJECT
#synthesize window;
#synthesize myViewController;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
MyViewController *aViewController = [[MyViewController alloc] initWithNibName:#"MyViewController" bundle:[NSBundle mainBundle]];
[self setMyViewController:aViewController];
[aViewController release];
UIView *controllersView = [myViewController view];
[window addSubview:controllersView];
// Override point for customization after application launch
[window makeKeyAndVisible];
}
- (void)dealloc {
[myViewController release];
[window release];
[super dealloc];
}
#end
And it is one of the content within the 'MyViewController.m', I use this to switch to the control from the 'MyViewController.m' to 'SimpleTableView.m'
- (void) switchPageShowTable {
NSLog(#"%d: switchPageShowTable", order);
order++;
SimpleTableView *simpleTableView = [[SimpleTableView alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:simpleTableView animated:YES];
}
Is it affect the use of the 'self' in the calling title? Thank you very much.
The title you expect to see is displayed in a navigation bar, which is usually part of UINavigationController. To make it work you have to do the following:
SimpleTableView *simpleTableView = [[SimpleTableView alloc] initWithNibName:nil bundle:nil];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController: simpleTableView];
[self presentModalViewController:navController animated:YES];
[simpleTableView release];
[navController release];
And (a small nitpick) instead of
self.navigationItem.title = #"Table Title Hello";
you can do this:
self.title = #"Table Title Hello";
unless you have a reason to explicitly use the navigationItem.
Is the view your trying to load a subclass of UITableViewController?
And what does [self flowControl] do exactly?
Related
I have page-based app. On each page I have 3 uibuttons at the top, uiscrollview with alphabet (uibuttons to sort data in uitable) at the right and uitableview at the center. How to show cell's detail view? If it is necessary to add uinavigationcontroller I can't do this. If I adds it, it disables interaction with my table, buttons and scrollview.
And another question is how to show new data in tableview and scrollview when goes to next page??
I have rootViewController class and DataViewController class.
rootViewController listing:
#interface RootViewController ()
#property (readonly, strong, nonatomic) ModelController *modelController;
#end
#implementation RootViewController
#synthesize pageViewController = _pageViewController;
#synthesize modelController = _modelController;
#synthesize navContr = _navContr;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
// Configure the page view controller and add it as a child view controller.
//[self presentModalViewController:navContr animated:YES];
self.pageViewController = [[[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStylePageCurl navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil] autorelease];
self.pageViewController.delegate = self;
DataViewController *startingViewController = [self.modelController viewControllerAtIndex:0 storyboard:self.storyboard];
NSArray *viewControllers = [NSArray arrayWithObject:startingViewController];
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:NULL];
self.pageViewController.dataSource = self.modelController;
[self addChildViewController:self.pageViewController];
[self.view addSubview:self.pageViewController.view];
self.navContr = [[UINavigationController alloc] initWithRootViewController:self.pageViewController];
[self.view addSubview:self.navContr.view];
// Set the page view controller's bounds using an inset rect so that self's view is visible around the edges of the pages.
CGRect pageViewRect = self.view.bounds;
self.pageViewController.view.frame = pageViewRect;
[self.pageViewController didMoveToParentViewController:self];
// Add the page view controller's gesture recognizers to the book view controller's view so that the gestures are started more easily.
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
for (UIGestureRecognizer *recognizer in self.pageViewController.gestureRecognizers){
if ([recognizer isKindOfClass:[UITapGestureRecognizer class]]){
[recognizer setEnabled:NO];
}
}
}
After few manipulations it works but I need help to get it work fine!
So now it looks like this
Next question: how do I remove the brown space at the top???
::UPDATE::
Problem solved. It needs just to set y-axis position of UINavigationController to -20 ;)
i'm not sure if this link about creating navigation-based project may help you.. (http://iosmadesimple.blogspot.com/2012/08/navigation-based-project-doing-it.html)
From that tutorial, there's a class called SampleViewController, subclass of UIViewController. You might want to put a tableView in SampleViewController.xib file. Then in your SampleViewController.h file, add an IBOutlet UITableView* yourTable property and synthesize it. Connect it to your tableView in your .xib file. //Or you may do it programmatically
in your SampleViewController.h, make your interface header look like this.. I think you already know this...
#interface SampleViewController:UIViewController < UITableviewDelegate, UITableViewDatasource >
in your SampleViewcontroller.m, under viewDidLoad method, set the table delegate and datasource to self:
yourTableView.delegate = self;
yourTableView.datasource = self;
Afterwhich, you implement tableView delegate and datasource methods... //you already know those since you were already able to show a tableview ;)
one of these methods is the "tableview:didSelectAtIndexpath:" --> this is the part wherein you can put your code when you click one of the cells.
Let's assume you have the DetailsViewController Class, this is the class you would like to show after clicking a cell and show its details.
DetailsViewController Class must have a variable that will accept the data you would like to show. Let's say, an NSString *detailsMessage; //do the #property and #synthesize thing...
Let's go back to SampleViewController.m file, under tableview:didSelectAtIndexpath: Method:
inside that Method.. put these codes.
DetailsViewController *detailsVC = [[DetailsViewController alloc] init];
detailsVC.detailsMessage = #"The Data you want to pass.";
[self.navigationController pushViewController:detailsVC animated:YES];
I hope this helps. :(
There may be other ways but by far the easiest way is to use a navigation controller. In fact, it is built to do exactly this.
If you don't want the navigationBar then you can hide it in the viewWillAppear function.
[self.navigationController setNavigationBarHidden:YES animated:YES];
Then you can add an other UIViewController to push when the user selects a cell.
Having read your OP again I'm not sure how you are adding your navigationController.
To use a navigationController you create it and load it at start time. You then create your current viewController (the one with the buttons and table etc...) and set this as the rootViewController of the navigationController.
Then you display the navigationController.
Could you explain how you are adding your navigationController as it may help understand what is going wrong.
Thanks
::EDIT::
OK, my assumption was correct.
The way you are using the navigation controller is not how it was intended.
OK, so at the moment your AppDelegate file will have a method Application didFinishLaunching...
It will look something like this...
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.viewController = [[OJFViewController alloc] initWithNibName:#"MainViewController" bundle:nil];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
You should change it so that it is like this...
first add a property to your appDelegate...
#property (nonatomic, strong) UINavigationController *navigationController;
Then change the didFinishLaunchingMethod to this...
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.viewController = [[OJFViewController alloc] initWithNibName:#"MainViewController" bundle:nil];
self.navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
self.window.rootViewController = self.navigationController;
[self.window makeKeyAndVisible];
return YES;
}
This will still show you MainViewController but it will now be contained within a navigationController.
Next in your MainViewController function viewWillAppearAnimated add the line...
[self.navigationController setNavigationBarHidden:YES animated:animated];
This will then hide the navigationBar at the top of the view so you still have access to your buttons.
The you need a new ViewController and xib file (for example DetailViewController).
When the user selects a table row you need to then do something like...
DetailViewController *detailView = [[DetailViewController alloc] initWithNibName:#"DetailViewController" bundle:nil];
//pass in details of which row was selected.
[self.navigationController pushViewController:detailView animated:YES];
This will then display your new view and new viewController. You will also need to write a way of passing the data in (set up a property on the DetailViewController).
Hope this helps.
I'm having trouble coding a button to go to the previous page. I was able to do it to go to the next page thinking if I did the same thing but changed it a bit it would work in reverse. Unfortunately, I come up with a lot of errors I can't resolve because it won't allow me to use the release function.
This is this the code that helps it to work going to the next page fine:
#import "ViewController.h"
#implementation ViewController
-(IBAction)btnClicked:(id) sender
{
//add the view of the view controller to the current View---
if (menuView==nil) {
menuView =
[[MenuView alloc] initWithNibName:#"MenuView"
bundle:nil];
}
[self.view addSubview:menuView.view];
}
-(void)dealloc {
[menuView release];
[super dealloc];
}
How do I do it so that a back button will go to the previous page though.
It's pretty simple, use this :
-(IBAction)back:(id) sender
{
[menuView.view removeFromSuperview];
}
But, I would suggest not using addSubview: for many views as it would be complex way to do. Use UINavigationController as #Paul.s suggested.
The way you are doing this is not quite correct and I would suggest doing some reading to get familiar with iOS programming.
Your program structure should be: create a navigation controller (2) to manage the stack of view controllers giving it a viewController (1) to act as it's root.
// AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// 1
FirstViewController *firstViewController = [[FirstViewController alloc] init];
// 2
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:firstViewController];
[firstViewController release]; firstViewController = nil;
self.window.rootViewController = navigationController;
[navigationController release]; navigationController = nil;
[self.window makeKeyAndVisible];
return YES;
}
This will display your first view controller inside a UINavigationController. A UINavigationController is responsible for managing a stack of UIViewController's and giving you UI to navigate back down the stack as well as calling all the appropriate presentation related methods on a UIViewController at the correct times e.g. viewDidLoad. You should check out The View Controller Programming Guide for lots of info
Then inside your first view controller you do something like this to respond to the button:
- (IBAction)buttonClicked:(id)sender;
{
SecondViewController *secondViewController = [[SecondViewController alloc] init];
[self.navigationController pushViewController:secondViewController animated:YES];
[secondViewController release]; secondViewController = nil;
}
This creates a new view controller and pushes it onto the stack.
I'm not sure how to do this. So I originally had a ViewController that had one .xib, with one main view. I present it like this:
DogViewController *dvc = [[DogViewController alloc] initWithNibName:#"DogViewController" bundle:nil];
dvc.modalPresentationStyle = UIModalPresentationFormSheet;
dvc.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:dvc animated:YES];
[dvc release];
So that works fine. However now from a button press in the DogViewController.xib, I want to dismiss the current form sheet, and show another form sheet with some additional questions before proceeding. So I started by adding another view to in my original .xib of DogViewController, then got stuck in the logic of how to dismiss the first one, and show the second one. I'm assuming I need some outlet to the new view in the same .xib, but from there I'm lost. Thanks.
The way to do this would be to set it up with a UINavigationController as Mathiew mentions. However, if you really want to transition between two views on one view controller, you can refer to this sample code from Apple:
http://developer.apple.com/library/ios/#samplecode/ViewTransitions/Introduction/Intro.html
The code uses ImageViews to demonstrate the effect but I don't see why you can't use views instead :)
You can add a view within the other view in front of all of the other objects and just use its hidden property to control whether it's shown or not.
Why don't you use a navigation controller in your modal view, create another xib and do a [self.navigationController pushViewController:secondViewController animated:YES];
If you have a good reason, you can set a second view outlet secondView and use code like
UIView* superview = [self.view superview];
[self.view removeFromSuperView];
[superview addSubview:self.secondView];
Very simple solution is to hold reference to MainViewController and call methods on it that swap between two view controllers.
Like this:
#implementation MainViewController
- (void)showDogViewController {
[self dismissModalViewControllerAnimated:YES];
DogViewController *dvc = [[DogViewController alloc] initWithNibName:#"DogViewController" bundle:nil];
dvc.modalPresentationStyle = UIModalPresentationFormSheet;
dvc.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
dvc.mainViewController = self;
[self presentModalViewController:dvc animated:YES];
[dvc release];
}
- (void)showCatViewController {
[self dismissModalViewControllerAnimated:YES];
CatViewController *cvc = [[CatViewController alloc] initWithNibName:#"CatViewController" bundle:nil];
cvc.modalPresentationStyle = UIModalPresentationFormSheet;
cvc.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
cvc.mainViewController = self;
[self presentModalViewController:cvc animated:YES];
[dvc release];
}
}
#end
#implementation DogViewController
- (void)showCatViewController {
[mainViewController showCatViewController]
}
#end
#implementation CatViewController
- (void)showDogViewController {
[mainViewController showDogViewController]
}
#end
I'm using the Kal calendar. For the code shown below I'm referring to the Holiday example. In this example the allocation and initialization of Kal is done in the applicationDidFinishLaunching in the AppDelegate. The UITableViewDelegate protocol (e.g. didSelectRowAtIndexPath) is also positioned in the AppDelegate class.
The AppDelegate:
#import "HolidayAppDelegate.h"
#import "HolidaySqliteDataSource.h"
#import "HolidaysDetailViewController.h"
## Heading ###import "Kal.h"
#implementation HolidayAppDelegate
#synthesize window;
- (void)applicationDidFinishLaunching:(UIApplication *)application
{
kal = [[KalViewController alloc] init];
kal.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:#"Today" style:UIBarButtonItemStyleBordered target:self action:#selector(showAndSelectToday)] autorelease];
kal.delegate = self;
dataSource = [[HolidaySqliteDataSource alloc] init];
kal.dataSource = dataSource;
// Setup the navigation stack and display it.
navController = [[UINavigationController alloc] initWithRootViewController:kal];
[window addSubview:navController.view];
[window makeKeyAndVisible];
}
// Action handler for the navigation bar's right bar button item.
- (void)showAndSelectToday
{
[kal showAndSelectDate:[NSDate date]];
}
#pragma mark UITableViewDelegate protocol conformance
// Display a details screen for the selected holiday/row.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
Holiday *holiday = [dataSource holidayAtIndexPath:indexPath];
HolidaysDetailViewController *vc = [[[HolidaysDetailViewController alloc] initWithHoliday:holiday] autorelease];
[navController pushViewController:vc animated:YES];
}
#pragma mark -
- (void)dealloc
{
[kal release];
[dataSource release];
[window release];
[navController release];
[super dealloc];
}
#end
I don't want to put this into the AppDelegate, because there could be some overlapping code with other views. It should be a separate "component" which I can call and put on the stack.
In my navigation based project I have a main view, the RootViewController. From there I want to push the Kal view on the stack. Currently I'm pushing an additional ViewController on the stack. In the viewWillAppear method from this ViewController I do the things shown in the code above. The following problems appear:
Navigation back has to be done two times (one for the Kal calendar, one for my created view)
Navigation to my main view is not possible anymore
In the moment I don't know where to put this code. So the question is where to put the methods for allocation/initialization as well as the methods for the UITableViewDelegate protocol.
Solution:
if (kal == nil) {
kal = [[KalViewController alloc] init];
kal.navigationItem.title = NSLocalizedString(#"Timetable",#"");
kal.delegate = self;
self.dataSource = [[[MyDataSource alloc] init] autorelease];
kal.dataSource = dataSource;
}
[[self navigationController] pushViewController:kal animated:YES];
I've done the initialization in my RootViewController. This isn't the best solution, but I didn't found another one.
Suggest to read the SimpleEKDemo example from Apple.
I'd like to launch a modal view controller the way one does with 'ABPeoplePickerNavigationController' and that is without having to creating a navigation controller containing the view controller.
Doing something similar yields a blank screen with no title for the navigation bar and there's no associated nib file loaded for the view even though I am invoking the initWithNibName when the 'init' is called.
My controller looks like:
#interface MyViewController : UINavigationController
#implementation MyViewController
- (id)init {
NSLog(#"MyViewController init invoked");
if (self = [super initWithNibName:#"DetailView" bundle:nil]) {
self.title = #"All Things";
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.title = #"All Things - 2";
}
#end
When using the AB controller, all you do is:
ABPeoplePickerNavigationController *picker = [[ABPeoplePickerNavigationController alloc] init];
picker.peoplePickerDelegate = self;
[self presentModalViewController:picker animated:YES];
[picker release];
ABPeoplePickerNavigationController is declared as:
#interface ABPeoplePickerNavigationController : UINavigationController
The other way to create a modal view as suggested in Apple's 'View Controller Programming Guide for
iPhone OS':
// Create a regular view controller.
MyViewController *modalViewController = [[[MyViewController alloc] initWithNibName:nil bundle:nil] autorelease];
// Create a navigation controller containing the view controller.
UINavigationController *secondNavigationController = [[UINavigationController alloc] initWithRootViewController:modalViewController];
// Present the navigation controller as a modal view controller on top of an existing navigation controller
[self presentModalViewController:secondNavigationController animated:YES];
I can create it this way fine (as long as I change the MyViewController to inherit from UIViewController instead of UINavigationController). What else should I be doing to MyViewController to launch the same way as ABPeoplePickerNavigationController?
I'd like to launch a modal view controller the way one does with 'ABPeoplePickerNavigationController' and that is without having to creating a navigation controller containing the view controller
But this is exactly what ABPeoplePickerNavigationController is doing. It isn't magic, it is a UINavigationController that instantiates a UIViewController internally (a UITableView that is populated with your address book contacts) and sets the UIViewController as its root view.
You can indeed create your own similar UINavigationcontroller subclass. However, within it's initializer, you will need to create a view controller to load as its root view just like ABPeoplePickerNavigationController does.
Then you can do what you are trying like this:
[self presentModalViewController:myCutsomNavigationController animated:YES];
In the code you posted:
#interface MyViewController : UINavigationController
#implementation MyViewController
- (id)init {
NSLog(#"MyViewController init invoked");
if (self = [super initWithNibName:#"DetailView" bundle:nil]) {
self.title = #"All Things";
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.title = #"All Things - 2";
}
#end
I suspect you are having NIB issues. there isn't a "rootViewController" outlet to connect. This is why you have a blank screen.
The initalizer you should be using internally is this:
self = [super initWithRootViewController:myCustomRootViewController];