I've a view part of tab bar controller. I've added a UIpickerview to the View. The delegate and data source of the uipickerview is the viewcontroller.
I've a coded like this
- (void)viewDidLoad{
[super viewDidLoad];
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"bg.png"]];
self.arrCurrencies = [[NSMutableArray alloc] init];
[self.arrCurrencies addObject:#"USD"];
[self.arrCurrencies addObject:#"GBP"];
[self.arrCurrencies addObject:#"INR"];
[self.arrCurrencies addObject:#"EUR"];
[self.arrCurrencies addObject:#"YEN"];
[self.arrCurrencies addObject:#"AUD"];
[self.arrCurrencies addObject:#"SGD"];
[self.pickerView reloadAllComponents];
[self.pickerView selectRow:2 inComponent:0 animated:NO];
}
I tried the above code, it's not selecting the 3rd row or INR in the pickerview by default. Can someone suggest me where I'm wrong..!
I don't see your .delegate method, but make sure you have it in this order:
mypicker.delegate = self;
[mypicker selectRow:[[General sharedInstance] displayMode] inComponent:0 animated:YES];
I had the delegate call method after the 'selectRow' method and I was mad looking for the solution in internet. 2 days with a lot of solutions, and only was this!!!
So, this doesn't work:
[mypicker selectRow:[[General sharedInstance] displayMode] inComponent:0 animated:YES];
mypicker.delegate = self;
A hint: My class is UIViewController child.
Related
I´m having some problems when saving data in core data and also with the rows organization and for better understanding of what my problem is, i´m going to explain what i have:
I have a main tableview working with dynamic rows, in this tableview i have a + button, whenever the + button is pressed, a tableview appears inside a popover were the user can choose the "type of cell" to insert in the main tableview. The "type of cell" are custom cells and they have they´re one class and xib file. Each custom cell has various textfields...so the idea is:
choose a type of cell and insert in the main tableview.
fill the textfields with data.
the data saved corresponds to the number of rows inserted and the data in the textfields.
When calling the popover tableview i have this method in my main tableview:
- (IBAction)Add:(id)sender
{
SelectProduct *typeProduct=[[self.storyboard instantiateViewControllerWithIdentifier:#"selectTable"]initWithTableViewTag:self.tableView.tag];
self.popover=[[UIPopoverController alloc]initWithContentViewController:typeProduct];
[popover presentPopoverFromBarButtonItem:buttonAdd permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
typeProduct.popView = self.popover;
typeProduct.cellSelected = self.cellSelected; //cellSelected is core data subclass.
typeProduct.delegate = self;
typeProduct.managedObjectContext = self.managedObjectContext;
}
then in my didSelectRow of my popover tableview, i have:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
row = indexPath.row;
if (row == 0)
{
cellSelected=[NSEntityDescription insertNewObjectForEntityForName:#"CellSave" inManagedObjectContext:self.managedObjectContext];
cellSelected.nameCellData = #"Olive";
cellSelected.amountData = myCostumCell.amount.text;
}
From here, a cell is inserted in my main tableview, here´s my main tableview relevant methods:
- (void)viewDidLoad
{
[self.tableView registerNib:[UINib nibWithNibName:#"myCostumCellXib" bundle:nil] forCellReuseIdentifier:#"myCostumCell"];
AppDelegate *appDelegate =[[UIApplication sharedApplication] delegate];
self.managedObjectContext=[appDelegate managedObjectContext];
NSError *error = nil;
if (![self.fetchedResultsController performFetch:&error])
{
// Replace this implementation with code to handle the error appropriately.
// abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
abort();
}
[self fetchedResultsController];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"myCostumCell";
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell.cellSelected = self.cellSelected;
cell.managedObjectContext = self.managedObjectContext;
if (cell == nil)
{
cell = [[MyCostumCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cellSelected = [self.fetchedResultsController objectAtIndexPath:indexPath];
cell.nameCell.text = cellSelected.nameCellData;
if ([cellSelected.nameCellData isEqualToString:#"Olive"])
{
cell.amount.text = cellSelected.amountData;
// i have more textfields to assign but i think you understand the rest..
}
}
My fetchedResultsController method: ( also have the others but they are the standard stuff)
- (NSFetchedResultsController *)fetchedResultsController
{
if (_fetchedResultsController != nil)
{
return _fetchedResultsController;
}
// Create and configure a fetch request.
NSFetchRequest *fetchRequestCellSave = [[NSFetchRequest alloc] init];
NSEntityDescription *entityCellSave=
[NSEntityDescription entityForName:#"CellSave" inManagedObjectContext:self.managedObjectContext];
[fetchRequestCellSave setEntity:entityCellSave];
// Create the sort descriptors array.
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"nameCellData" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[fetchRequestCellSave setSortDescriptors:sortDescriptors];
_fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequestCellSave managedObjectContext:self.managedObjectContext sectionNameKeyPath:#"nameCellData" cacheName:nil];
_fetchedResultsController.delegate = self;
self.fetchedResultsController = _fetchedResultsController;
return _fetchedResultsController;
}
Now if i want to exit the main tableview and go to another tableview, i understand that i have to save the content of the textfields in my managedObject, so:
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
cellSelected.amountData = cell.amount.text;
//i have more textfields to assign but for the example i think you understand
what i want.
[self.managedObjectContext save:nil];
}
From here, one row is "saved" and the text in the amount also...but the problems start when i add one more row:
Why the new row appears on top of the tableview, instead of after the previous row inserted?
When i fill the textField (amount) of the second row inserted...exit the tableview and come back...the textfield doesn´t appears filled..What am i doing wrong?
The previous issue happens if i insert 2 rows at once, but if i insert one...exit the tableview and then come back and insert another row...the textfield amount is saved...
Where´s my problem? is it in my custom cell class? Where?...I´m sorry for the long post, but this is driving me crazy...
thanks for your time
Regards
You need to save the data as soon as it is entered, not just when the view is removed from display. As soon as a cell is scrolled off screen it will be reused or killed so you have to save your text before that happens. Best place is in the text field delegate callback when the text is changed.
When you add 2 rows before saving you have corrupted your internal state (when the second row is added but you haven't yet saved the data from the first row).
Your rows are sorted by entered text so it depends on the text (or lack of) to determine where it appears on screen.
You probably shouldn't be giving the cell a reference to the managed object context (not MVC).
You should also think about the difference between local and instance variables as your code seems to confuse them...
Hi everybody I have a problem using CoreData Persistence, my problem is, when I launch my application I manage to add some data (from a form within the app) to my DataBase and display them with using NSLog.
But actually I think all these data disappear when I stop the ipad emulator and re launch it after..
So i don't really know if it comes from my code or if it's because of the emulator.
I made a diagram to show you the architecture of my app and my entities:
The problem is that i'm using different viewController so i need to pass the ManagedObjectModel to each one. My form is in the newDocumentViewController, when i add somme entities i would like to access them in all the others viewController and save it to the app local storage.
Here is some code to show you a bit:
AppDelegate.m
#synthesize managedObjectContext = __managedObjectContext;
#synthesize managedObjectModel = __managedObjectModel;
#synthesize persistentStoreCoordinator = __persistentStoreCoordinator;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:#"DetailViewController" bundle:nil];
UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];
MasterViewController *masterViewController = [[MasterViewController alloc] initWithNibName:#"MasterViewController" bundle:nil];
UINavigationController *masterNavigationController = [[UINavigationController alloc] initWithRootViewController:masterViewController];
masterViewController.managedObjectContext = self.managedObjectContext;
detailViewController.managedObjectContext = self.managedObjectContext;
I have those properties within each masterViewController and DetailViewController (and from DetailViewController to NewDocumenViewController) to receive the objectContext
#property (nonatomic,strong) NSManagedObjectContext *managedObjectContext;
So with this i don't really know how to access my data from each controller and is the data is stored locally by doing like this:
NewDocumentController.m
-(void) addNewDocument:(NSString*)name with_niveau:(NSInteger)level{
Document *doc = [NSEntityDescription insertNewObjectForEntityForName:#"Document" inManagedObjectContext:managedObjectContext];
doc.nom=name;
doc.niveau=[NSNumber numberWithInteger:level];
}
-(void) addNewDocument_info:(NSString*)name with_createur:(NSString*)createur with_dateModif:(NSDate*)date1 with_status:(BOOL)etat{
DocumentInfo *doc_info = [NSEntityDescription insertNewObjectForEntityForName:#"DocumentInfo" inManagedObjectContext:managedObjectContext];
doc_info.nom =name;
doc_info.createur=createur;
doc_info.date_creation=[NSDate date];
doc_info.date_modification=date1;
doc_info.status= [NSNumber numberWithBool:etat];
}
You need to save your data:
NSError *error = nil;
[self.managedObjectContext save:&error];
I have a small UIView that I hide/show in to show a message to the user. The message itself is in a UITextView that I add to the small UIView that gets shown.
The sliding-in and sliding-out works fine - but the prior messages are not cleared. I have spent enough time to fix the problem - but to no avail. Can someone lend me their eyes!!
Here is how the UITextField is created programatically:
#interface MessageVC : UIViewController {
UITextView *messageTV;
}
#property (nonatomic, retain) UITextView *messageTV;
- (id)init;
- (void)showMsg:(NSString *)title;
#end
and
- (id)init {
if (self = [super init]) {
self.view = [[[UIView alloc] initWithFrame:CGRectMake(0, 380, 320, 100)] autorelease];
[self.view setBackgroundColor:[UIColor blackColor]];
}
return self;
}
- (void)showMsg:(NSString *)title {
[self setMessageTV : [[UITextView alloc] initWithFrame:CGRectMake(5, 5, 315, 90 )]];
[[self messageTV] setBackgroundColor : [UIColor greenColor]];
[[self messageTV] setTextColor : [UIColor whiteColor]];
[[self messageTV] setText:#""]; <<<<<<<< - does not clear the text
[[self messageTV] setText : title];
[self.view addSubview : [self messageTV]];
[self.view setHidden:NO];
}
- (void) hideMessage {
[self.view setHidden:YES]
}
I'll go out on a limb and ask why you're using a UITextView. I honestly have never needed to use a UITextView. Try changing it to a UILabel and see if the problem is specific to the UITextView. If you absolutely need a UITextView, let me know in a comment, but I have a suspicion that a UILabel is what you're after.
It appears that you are adding it as a subview every time. So you're actually creating multiple UITextViews and adding them on top of each other. You would either need to removeFromSuperview or just set the text of the instance variable.
Take these two lines out of showMsg and put them in viewDidLoad:
[self setMessageTV : [[UITextView alloc] initWithFrame:CGRectMake(5, 5, 315, 90 )]];
[self.view addSubview : [self messageTV]];
Using the below code I am implementing my own Navigation Bar. For some reason when I run my app nothing is showing up for a back (left-arrow) button on the navigation bar. However if I change the code to leftBarButtonItem, the button does appear.
// Draw Navigation Bar
UINavigationBar *navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
[navigationBar setDelegate:self];
UINavigationItem *navigationItem = [[UINavigationItem alloc] init];
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:#"Back"
style:UIBarButtonItemStylePlain
target:nil
action:nil];
navigationItem.backBarButtonItem = backButton;
[navigationBar pushNavigationItem:navigationItem animated:NO];
[self.view addSubview:navigationBar];
[navigationBar release];
[backButton release];
The backBarButtonItem is set by the parent ViewController.
In other words, it's not set by the ViewController on which you see it but by the ViewController to which it points. So if your ViewController is the first in line, it just won't have a back button.
Also, you are creating a NavigtionBar by yourself. This is usually not the way to go, a UINavigationBar isn't a UI-Element like a Button or a Label. You should rather use a UINavigationController to handle all the pushing and popping of your ViewControllers.
Figured it out:
// Draw Navigation Bar
UINavigationBar *navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
[navigationBar setDelegate:self];
UINavigationItem *navigationItem = [[UINavigationItem alloc] init];
UIButton *button = [UIButton buttonWithType:101];
// add selector
[button setTitle:#"Back" forState:UIControlStateNormal];
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithCustomView:button];
navigationItem.leftBarButtonItem = backButton;
[navigationBar pushNavigationItem:navigationItem animated:NO];
[self.view addSubview:navigationBar];
[navigationBar release];
[backButton release];
I have created navigation based project. and in second screen i want to add uitabbarcontroller. so can any one suggest how i do this.
i already did lot of search but no success yet. so please can you provide a simple sample of this. i already tried below discussion but i think its not a good approach.
Navigation Based Application with TabBar
Thanks
Actually this is the correct approach. The one thing that is not correct is where the controllers are allocated. This is happened in the previous controller, the one that is making the push, but should be allocated in the object that is responsible, the TabBarController.
When you implement your action to show the UITabBarController make the following code:
- (void) theAction {
SomeTabBarControllerSubClass *controller = [[SomeTabBarControllerSubClass alloc] init];
[self.navigationController pushViewController:controller animated:YES];
[controller release];
}
Then when you implement the SomeTabBarControllerSubClass class:
(.h)
#interface SomeTabBarControllerSubClass : UITabBarController {
UIViewController *first;
UIViewController *second;
}
#end
(.m)
#implementation SomeTabBarControllerSubClass
- (void) viewDidLoad {
first = [[UIViewController alloc] init]; //Or initWithNib:
second = [[UIViewController alloc] init];
first.view.backgroundColor = [UIColor greenColor] //Just example
second.view.backgroundColor = [UIColor redColor] //Just example
first.tabBarItem.image = [UIImage imageNamed:#"someImage.png"];
self.viewControllers = [NSArray arrayWithObjects:first,second,nil];
}
- (void) dealloc {
[first dealloc];
[second dealloc];
[super dealloc];
}
#end