I need to know how to keep the data they contain elements of View (TextField, etc) after pressing a button that leads to another view and then return to the initial data keeping at first sight establish a price in the second defined as that price should we pay each guest, to return to the view in which the price is set, data proviamente introduced, and the total has gone ... (I try to return an array of diners).
ContactosViewController.h
#class ContactosViewController;
#protocol ContactosViewControllerDelegate
- (void)addItemViewController:(ContactosViewController *)controller didFinishEnteringItem:(NSMutableArray *)item;
#end
#property (weak, nonatomic) id <ContactosViewControllerDelegate> delegate;
AltaViewController.h
#interface AltaViewController : UIViewController <ContactosViewControllerDelegate>
AltaViewController.m
-(void)addItemViewController:(ContactosViewController *)controller didFinishEnteringItem:(NSMutableArray *)item
{
NSString *personaString =[NSString stringWithFormat:[item objectAtIndex:0]];
self.altaResumen.text=personaString;
[self dismissViewControllerAnimated:YES completion:nil];
}
I'm new to this taking references from various places, I appreciate any contribution however small.Thank you very much.
Your question is VERY hard to understand. I have the impression you have the following problem:
You have a view controller, probably set up in storyboard, that contains some interface elements (UITextField, etc.). The user enters something there, before he/she is shown another view controller, whose view is used to enter additional data (price, etc.). When you return from the 2nd view, you want to have the data entered in the 1st view still available.
If this is the case, you simply had to define properties of the 1st view controller, and assign the data entered to them. If the data is e.g. a NSString, you probably would use something like
#property (nonatomic, strong) NSString *myString;
Declaring them as strong (default) will keep the data alive at least until the view controller is itself deallocated.
I have a first UIViewController where data is entered into a textField, a button that when clicked leads to another view where additional data are allocated and once introduced back to the initial view, the back, the view has lost the data entered above.
Related
Three Column(i.e Three Table Views in each Column) UI Design View.
To design the UI on the both iPhone and iPad is possible like 3 column of different tableviews
And among all of columns there is also need interaction like when ever one cell selected in the first tableview then corresponding cell details need to display in the middle table view.(Like Split View Controller.)
And, finally in third table view controller need to display some retailer names too.
Yes, it is possible to create as shown in the iProSoccer app screenshot below. Selecting a plan on left table shows the drills in the middle column. The right column contains the available drills that can be dragged into a plan (middle column). This is a single view controller containing three table controllers added as child view controllers.
EDIT
Each of the UITableViewController's defines a protocol and delegate the containing UIViewController subscribes to. When an action by the user, for example, tapping a plan in the left table view, the left table view controller tells (sends a message to) the delegate (the containing UIViewController). In this example the message includes the plan that was selected. The containing UIViewController updates the center UITableViewController with the plan. The center UITableViewController then loads the details of the plan.
Snippet of (the child) PlanTableViewController.h including protocol and delegate definition:
#import "Plan.h"
#class PlanTableViewController;
#protocol PlanTableViewControllerDelegate <NSObject>
-(void)planSelected:(Plan *)plan sender:(id)sender;
// Additional protocol methods here...
#end
#interface PlanTableViewController : UITableViewController
#property (nonatomic, weak)id <PlanTableViewControllerDelegate>delegate;
// Additional properties and methods here...
#end
Snippet of (the parent) PlanningTableViewController.m including the implementation of the delegate method:
#interface PlanningTableViewController () {
PlanTableViewController *planTableViewController;
// Additional properties declarations here...
#end
#implementation PlanningTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
planTableViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"planTableViewController"];
planTableViewController.delegate = self;
}
#pragma mark - PlanTableViewController delegate methods
- (void)planSelected:(Plan *)plan sender:(id)sender {
[drillTableViewController planSelected:plan];
}
// Additional delegate methods here...
#end
I am trying to learn iOS development but have stalled a bit so I hope that there is some kind soul here who might be able to help me in the right direction.
Let's say I have a UITableViewController that displays a number of items, consisting of a title and subtitle ( Subtitle style of a Tableview Cell). Items.m/h only consist of two properties, title and subtitle and a init method to set the properties. In my app delegate i create some default items and pass them/set them to my tableViewController's property tvc.items, which is a NSMutableArray. What do I need to do / what components do I need, to be able to add more items and then display them in my tableViewController?
I started with the following:
Added a new view controller in the storyboard
Embeddade the viewController in a Navigation Controller
Added a Bar Button Item at my Table View Controller with an identifier of add
Ctrl + drag from BarButtonItem (add) to my new view controller selected modal segue
Created a new class AddNewItemViewController
Entered this as the class under the Identity Inspector for the new view controller
I then added two Bar Button Items, Cancel and Done (with cancel and done as identifiers) in the storyboard for the new View Controller
This was followed by me adding two UITextFields, one for the Title and one for the Subtitle
Ctrl + drag from these outlets into AddNewItemViewController.m, between #interface AddNewItemViewController () ... here ...#end (so they become Private? Should I drag it here or to AddNewItemViewController.h ?, What is the standard way for doing similar outlets?).
In AddNewItemViewController I added two properties, NSString's (nonatomic, copy) * title and *subtitle which I thought would keep the input data from an intended user.
So, after this I now want do two things, and it is here as it becomes difficult (for me at least):
Making so that by clicking on Cancel, one return to the Table View controller, ie a dismissed the modal .
Adding the data within the text fields to that NSMutableArray which is the datasource by clicking Done.
So what is required of me to do the last two steps?
Where should I ctrl + drag from the Cancel and Done (so there will be actions)? I guess they must be submitted to AddNewItemViewController.m, but what must be done to dismiss the modal (by clicking on the 'Cancel') and what should be called at or performed when clicking on 'Done'?
Which or what class (es) must know about the other class?
Last but not least, what should I send in the prepareForSegue call (which I guess I will need to have to use to send the input data back to the table view controller)?
Where to start and what methods should i learn about in order to achieve my mission?
Best Regards,
Rookie
much quesetions :)
I will beginn with the close action.
Have a look at the AppleDocumentation, dismissViewController with sender self (your AddViewController).
To store your data from AddViewController to your TableViewController, it's a better way to use delegation.
AddViewController.h
#protocol AddViewControllerDelegate;
#interface AddViewController : UIViewController
#property (nonatomic, weak) id<AddViewControllerDelegate>delegate;
#end
#protocol AddViewControllerDelegate <NSObject>
- (void) addViewControllerDidFinishTakingData:(AddViewController *)addViewController withTitle:(NSString *)title andSubtitle:(NSString *)subTitle;
#end
AddViewController.m
- (IBAction)done:(id)sender
{
NSString *title = ...;
NSString *subtitle = .. .;
[self.delegate addViewControllerDidFinishTakingData:self withTitle:title andSubtitle:subtitle];
}
TableViewController.m
#interface TableViewController ()<AddViewControllerDelegate>
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"yourIdentifier"])
{
AddViewController *addViewController = (AddViewController *)segue.destinationViewController;
addViewController.delegate = self;
}
}
Last but not least to implement your new delegate-method
- (void)addViewControllerDidFinishTakingData:(AddViewController *)addViewController withTitle:(NSString *)title andSubtitle:(NSString *)subTitle
{
// handle your data here (store to array)
// reload your table
}
Better way, to create a Class (Model) for every entry.
The simplest thing to do would be to assign tvc.items to the destinationViewController's property during prepareForSegue.
You are correct in thinking that the Cancel and Done buttons belong to the AddNewItemViewController.
In the action for Done, you could add the new item to the items array you passed in during prepareForSegue, then in the presenting view controller (the one you launched the modal from), during viewDidAppear just reload the table. It'll be called when the modal disappears.
This may sound silly, but read on...
I want to set the text of a UILabel from outside of a UIViewController that is instantiated by a storyboard. I need to make sure that the label property of the view controller is set when I set its text otherwise the label's text won't be set(because it won't be loaded yet to receive a text value).
Here's my current solution:
// Show pin entry
if (!self.pinViewController) {
// Load pin view controller
self.pinViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"pinScreen"];
self.pinViewController.delegate = self;
if (!self.pinViewController.view) {
// Wait for pin screen to fully load
}
[self.pinViewController setMessageText:#"Set a pin for this device"];
}
Initially I had a while loop that looped until the value of view was not nil, But it seems the very act of checking the view loads it(as mentioned here: http://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40006926-CH3-SW37)
I tried using the isViewLoaded method with no success. It just looped forever.
I've gone forward with the above code as my current solution, but it feels wrong.
Is there a better way ensure a UIView has loaded?
I want to propose an alternative way where you don't have to rely on the availability of the view.
If you need to wait for the view to load before you can call other methods on your viewController you break encapsulation, because the viewController that calls your PinViewController has to know about the inner workings of your PinViewController. That's usually not a good idea.
But you could save objects like NSStrings in the PinViewController instance, and when the view of the PinViewController will appear you set its views according to the properties you have set before.
If you need to change the text of an label from outside your viewController you can also create a custom setter that sets the label.text for you.
Your .h
#interface PinViewController : UIViewController
#property (copy, nonatomic) NSString *messageText;
// ...
#end
And your .m
#implementation PinViewController
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.messageLabel.text = self.messageText;
}
// optional, if you want to change the message text from another viewController:
- (void)setMessageText:(NSString *)messageText {
_messageText = messageText;
self.messageLabel.text = messageText;
}
// ...
#end
viewDidLoad should solve this I guess.
http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html
I would rather see you change your logic and do it the way that #MatthiasBauch shows in his answer. However, to answer your actual question, you can simply set a view property in order to force it to load:
self.pinViewController.view.hidden = NO;
I have a UIViewController class and a UITableViewController class. Within the UIViewController class I have an NSMutableArray.
I now have the issue of how to load data into my table view, a separate class, I must access the NSMutableArray I used to populate the previous UIViewController class.
I tried using a delegate to access the array in the UIViewControllerClass however the array had "0 objects" and was NULL
I would appreciate some guidance in the right direction here.
You could have one view controller hold a reference to the other view controller and query the public NSMutableArray on it for data. Aaron suggested this and it might be your best solution.
Or.. you have multiple view controllers trying to access the same set of data. Potentially you have other classes which will want to access this data also. You might want to consider pulling the data out of the view controller and storying it in a neutral location. You could store it in the AppDelegate and then reference the app delegates from any place you need it.
id<UIApplicationDelegate> appDelegate = [UIApplication sharedApplication].delegate;
NSMutableArray *myData = appDelegate.data;
You could also consider pulling all the logic of your data and the data itself into a separate class and use a Singleton It would allow you to access/manipulate the data fairly easy from anywhere.
The last 2 methods would insulate data from user interface controller objects and prevent the need from potentially unrelated objects needing to hold references to one another. Used properly it will reduce code complexity and mage future changes easier to manage.
Create an NSMutableArray property on your UITableViewController class like so:
#interface CustomTableViewController : UITableViewController
#property (strong, nonatomic) NSMutableArray *dataFromOtherClass;
#end
And then when you transition, perhaps like this, you can set the dataFromOtherClass property:
CustomTableViewController *controller = [[CustomTableViewController alloc] initWithNibName:#"CustomTableViewController" bundle:nil];
controller.dataFromOtherClass = myNSMutableArrayData; // <-- Set data like this
[self.navigationController controller animated:YES];
// Or ...
[self presentViewController:controller animated:YES];
// Etc...
In my project I have 3 controllers;
NavigationController
ServiceTableViewController
DateTableViewController
The ServiceTableViewController is the initial view controller. It has several rows which prompt the user to enter in data, which will be emailed to a particular email address. One of the rows, when tapped, sends the user to the DateTableViewController which prompts the user to select a date from the UIDatePicker.
The issue I am facing is getting data back from DateTableViewController in order to display a label on the ServiceTableViewController to show the date the user selects in the DateTableViewController. I know how to get information from one view controller to another, but to go in reverse, so to speak, is not something I know how to do. Any help is appreciated.
Take a look at this:
https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CocoaFundamentals/CommunicatingWithObjects/CommunicateWithObjects.html
There are couple of ways to pass data back and forth between view controllers.
Delegates
Target-Aciton
Notification
KVO
but honestly delegates are really all you need really and it sounds like in your current case.
see this -> (Passing Data between View Controllers)
Having said that, if you use delegates, here is how ---
setup a protocol in DateTableViewController.h at the top like so:
#protocol DateTableViewControllerDelegate <NSObject>
- (void)userSelectedThisDate:(NSDate *)d;
end
put this with the other properties
#property (nonatomic, weak) id <DateTableViewControllerDelegate> delegate;
and in DateTableViewController.m with the date to send back
[self.delegate userSelectedThisDate:withTheDateToSendBack];
in and ServiceTableViewController.h add
#import "DateTableViewController.h"
#interface ServiceTableViewController : UIViewController <DateTableViewControllerDelegate>
and since you are UINavigationController, somewhere in ServiceTableViewController.m add this when you are about to push to the DateTableViewController
DateTableViewController *vc = [[DateTableViewController alloc] init];
self.delegate = self;
[self.navigationController pushViewController:vc animated:YES];
and finally put the delegate method in ServiceTableViewController.m
- (void)userSelectedThisDate:(NSDate *)d {
NSLog(#"%#", d); // this should show the returned date
}
Research delegate pattern (here) (a heavily used pattern within Apple frameworks). You want to define a delegate protocol which allows to a date to be passed to the delegate.
You could implement the pattern as an #protocol with a single method and a property on the DateTableViewController. The ServiceTableViewController sets itself as the delegate before pushing the DateTableViewController.
Or, you could implement using a block. Again, the ServiceTableViewController sets the block before pushing the DateTableViewController.