How do I transfer data from my UITableViewCell to a UIViewController through a UINavigationController? As an example, what I want to do is transfer the UITableViewCell label name from the cell to the ViewController's label. If you look at the two pictures, you will see what I mean. Also, on another note, how in general do I transfer data from one view to another? Thanks
in Receiver view controller
in .h file
#interface ViewController : UIViewController
#property (strong, nonatomic) NSString *strDataOfCell;
#end
here make it strong so stays in memory
in table view delegate method
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
ViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:#"yourViewIdentifer"];
NSString *strData = [self.yourArrayOfData objectAtIndex:indexPath.row]; // Here Put your code to Get value from data source array , which is loaded in tableview
vc.strDataOfCell = strData;
[self.navigationController pushViewController:vc animated:YES];
}
Hope it helps :)
You can declare properties in the view controller header file you want to transfer.
If you navigate through code. You can assign the label to this view controller in table view didSelectRowAtIndexPath.
If you navigate through storyboard segue. You can assign the label to this view controller in prepareForSegue:sender:.
The answer to my question resides in the "prepareForSegue" method. It's all about manipulating the sender object to send it's data to the next view controller, and the setting next view controller's data based on the sender. I casted the sender to a custom UITableViewCell, took the cell's title, set a navigation controller's rootview to the view controller that was going to receive the data, and boom, gave it the data.
Related
I have a controller named as "firstViewcontroller" where i have a UITableView named as "discoveredInstanceTableView". I want to load that UITableView in to another UIViewController named as "secondViewcontroller"
I have used the below code but it is not working, It says property "discoveredInstanceTableView" not found ...Anybody please help me:
In the firstViewcontroller:
IBOutlet UITableView *discoveredInstanceTableView;
In the Secondviewcontroller:
firstViewcontroller *vc1 = [[firstViewcontroller alloc]initWithNibName:#"firstViewcontroller" bundle:nil];
[self addChildViewController:vc1];
[self.myTableview addSubview:vc1.discoveredInstanceTableView];
What you asked is valid only if you curious to know why the above thing is not working answer would be
You are doing something that is not allowed, this can not be done as per the documentation.
However, If we forget about the right wrong approach, you probably adding a table view as a subview over a table view itself and I am sure you passing a table view to a table view which might not be allocated.
First think about the UITableView how it works? it simply a ScrollableView which display content over its cells.
Eventually would recommend you read about TableView
EDIT: From the Above Comments
IMPORTANT: You should not embed UIWebView or UITableView objects in
UIScrollView objects. If you do so, unexpected behavior can result
because touch events for the two objects can be mixed up and wrongly
handled.ยป As UITableView is a UIScrollView, this applies here as well.
Possible Alternatives of displaying TableView inside the SecondViewController
Use #Rajath Kornaya's Answer And In my opinion that is not right approach since whenever you required callback action like on cell tap, you want to display an alert(or something else), you can't get the delegate callback inside the SecondViewController
But there are so many other right approaches available, that you should follow up.
Create a TableView separately either programmatically or through the XIB/Storyboard
Add delegate and data source (methods which responds when something interesting happened e.g Cell going to populate called cellForRowAtIndexPath) to current SecondViewController
Define all required data source methods and write proper code.
If you required to do something on cell tap, add specific delegate method too.
But if you want to reuse the FirstViewController Class TableView simply create a CustomView and add TableView inside there and simply add that view to each view controller class.
I hope it may helps you!!!
declare in viewcontroller2
#property (nonatomic, strong) UITableView *table;
create table in viewcontroller1
tableView=[[UITableView alloc]initWithFrame:CGRectMake(10, 10, 250, 300) style:UITableViewStylePlain];
[self.view addSubview:tableView];
tableView.backgroundColor=[UIColor greenColor];
while calling viewcontroller2 pass table to viewcontroller2
ViewController2 *v2=[[ViewController2 alloc]init];
v2.table=tableView;
UINavigationController *navigation=[[UINavigationController alloc]initWithRootViewController:v2];
[self presentViewController:navigation animated:YES completion:nil];
in viewcontroller2 access the table using the global variable
[self.view addSubview:self.table];
I have a slide menu. It is implemented using component SWRevealViewController. To implement it I have 1 main UIViewController (VC) - SWRevealViewController. I have menu VC and I have push segues to navigate to different menu's VCs.
For the menu I use prototype cells with custom class for each menu.
My problem is that I need to call unwind segue to go to login VC, using alert view. To do that I try usual method [self performSegueWithIdentifier:#"unwSegReturnToLogin" sender:self]; on positive answer from the alert view (inside custom class for exit cell). I have such method declared in my login VC. I receive error during the compilation:
No visible #interface for 'tvcellExitMenuItem' declares
the selector 'performSegueWithIdentifier:sender:'
I suspect that the problem is that self in my case is table cell and that is not UIViewController.
How to refer parent VC if this is the case?
If not, please tell me where I am wrong in the logic.
A subview shouldn't have to know about its parent viewController. Instead, a common pattern that fits your need is the delegate pattern : define a delegate property & protocol for your cells' class.
// your cell class header might look like this
#class MyCellClass;
#protocol MyCellDelegate
- (void)onCellSelected:(MyCellClass *)cell;
#end
#interface MyCellClass
#property (nonatomic, weak) id<MyCellDelegate> delegate;
#end
For example, if your viewController is also your UITableViewDatasource , then in tableView:cellForRowAtIndexPath: you can set your cell's delegate to self, and call the segue methods in delegate method.
- (void)onCellSelected:(MyCellClass *)cell
{
// retrieve cell indexPath
NSIndexPath *cellIndexPath = [self.tableView indexPathForCell:cell];
// using indexPth, retrieve cell's data
// push segue with data selected
}
Of course, this is only an example, and there are other corrects ways to do that.
I am using Storyboard in my app and I want to pass data from one view to another view.
Instead of using segues I am using instantiateViewControllerWithIdentifier. In this case I am instantiate from my first TableViewController to a NavigationController which has a second TableViewController attached because I need the navigation in the second TableViewController. Now I want to pass data from my first TableviewController, depending which row was clicked, to my second TableviewController. In this case newTopViewController would be my NavigationController but my problem is now how to pass data from firstTableViewController to the secondTableviewController.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *identifier = [NSString stringWithFormat:#"%#Top", [menuArray objectAtIndex:indexPath.row]];
UIViewController *newTopViewController = [self.storyboard instantiateViewControllerWithIdentifier:identifier];
}
If you instantiate a navigationController, you can use the viewControllers property to get the inner viewController of the navigation controller.
Something like this:
UINavigationController *navigationController = [self.storyboard instantiateViewControllerWithIdentifier:identifier];
MBFancyViewController *viewController = navigationController.viewControllers[0];
// setup "inner" view controller
viewController.foo = bar;
[self presentViewController:navigationController animated:YES completion:nil];
newTopViewController.anyVariableToShow= anyVariableToSend;
I do this pretty often on a few of my apps...
//Create new VC
CookViewController *detailViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"CookVC"];
//Set recipe
[detailViewController setRecipe:recipe];
//Pop over VC (can be pushed with a nav controller)
[self presentPopupViewController:detailViewController animationType:MJPopupViewAnimationFade];
If you aren't using a navigation controller or segues, then I think you need to reconsider your app design.
Actually it's not just a data pass problem as this is a program control and data transfer question together.
Even you would have to rethink about your app's concept, as you'd like to use storyboard without the meaning of storyboard, it's up to you and I hope you have good reason to do what you do.
So when you decided not to use segue you lost the new and comfortable way of instantiating a new controller and transferring data with it and you have to do the transfer of control and the data in two distinct steps. When you instantiate another scene in storyboard (like you do with instantiateViewControllerWithIdentifier:) you just instantiated a new controller and transferred the control but not the data. Just think about it as you instantiated a new controller from a xib in an old way (so you have to use initWithCoder: or awakeFromNib in the second view controller as the storyboard will not call initWithName:bundle:), but did not do anything more.
So you will have a new controller (it named in the identity part of the second storyboard) which is hanging in the universe without any relationship or connection with anything else (as the storyboard picture illustrates it nicely) and you could do with it what you'd like.
So you'd like to do something and you need data from the previous storyboard (ViewController). What you need is making available those data to the second storyboard(ViewController), and as you know there are lot of solution for this which were available long time before even storyboard is existed.
So regarding your code, the "data transfer" is depending on your design, whether the two controllers are subclasses of each other or whatsoever...
If you don't like to deal with subclassing and like to decoupling them as much as possible, the best way just make a property of your data in the first controller and refer to them from the second (after importing the first's .h file) and just refer to it in it's viewDidLoad or in initWithCoder: or anywhere where you need them, as
secondViewControllerdata = firstViewControllerdata.thatDataProperty
Of course you can do the same in reverse and make a property of the second controller and refer to it in your first view controller.
You can define some parameter in UIViewController to receive data:
#property (assign) int param1;
#property (retain) NSMutableArray *param2;
and use below to pass the data:
[newTopViewController setParam1:XX];
[newTopViewController setParam2:XX];
I have a UITableViewController within a UIViewController. While this table viewcontroller was the only one involved, it was pushing views just fine when the user would tap a row. However, ever since I moved it to be one of two contained within the UIViewController, the taps of rows suddenly do nothing.
I've tried searching around and I'm not the first to run into this problem, but none of the answers fit my circumstances or the questions have no working answers. That link was the closest I found, but I'm not using storyboards -- I'm using separate XIBs.
So how do I push a new view from a viewcontroller within a viewcontroller?
To recap:
Here is what I had, and it worked fine in taking users to a new screen!
// Normal table behavior, as illustrated by [another question][2].
- (void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
SomeView *detailViewController = [[SomeView alloc] initWithNibName:#"SomeView" bundle:nil];
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
}
Now I have the viewcontroller as a property in a view -- and the above code, which is in the file for the tableviewcontroller and not at the "main" view, doesn't cause a new screen to appear anymore!
Thanks for the comments! Here's some code to clarify my scenario.
The controllers within a controller. This is a file from a test project I've been using to test the concept out. In this case, I have a tableview controller within a tableview controller.
#interface SimpleTableViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
// This is the controller within the controller
#property IBOutlet SecondTableViewController *secondTableController;
#property IBOutlet UITableView *secondTable;
My SecondTableViewController has this fun bit.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
UIViewController *detailViewController = [[UIViewController alloc] initWithNibName:#"SimpleNonTableViewController" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[manualViewControllerParent.navigationController pushViewController:detailViewController animated:YES];
}
The view that the user interacts with is hooked up to SimpleTableViewController. In this way, SecondTableViewController is "within" SimpleTableViewController. Feel free to comment if you'd like more details!
I've put my test/concept project on github. https://github.com/hyliandanny/TableViewCeption
You need to use a custom container controller to do what you want. It would be easiest if you used a storyboard, but you can do it in code with xibs as well. The outer controller should be a UIViewController, not a table view controller. You can do something like this (in the outer controller):
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
UIViewController *detailViewController = [[UIViewController alloc] initWithNibName:#"SimpleNonTableViewController" bundle:nil];
[self addChildViewController:detailViewController];
detailViewController.view.frame = set the frame to what you want;
[self.view addSubview:detailViewController.view];
[detailViewController didMoveToParentViewController:self];
}
You should read up on Apple's documentation for custom container controllers.
What you need to make sure:
Your UITableView delegate is hooked up to your controller. Otherwise it wouldn't call didSelectRow. You can do this in xib or in viewDidLoad method.
Your self.navigationController is not nil
Your detailViewController is not nil
I also think that what you mean is you have UITableView inside your UIViewController. UITableView is only the view, whereas UITableViewController is a controller. You can't have a controller inside another controller.
have a question. I have an ipad app that contains a View Controller with a UITableView and a detail view (which is basically another view controller to display details) on the same screen. I need to pass the row data from UITableView when the -didSelectRowAtIndexPath is executed to this detail view. I am not sure how to go about doing this? Any help/pointers/sample code on how to go about doing this?
Thanks for your help in advance
Define a delegate in the UITableView view controller, and implement it in the detail view controller. When didSelectRowAtIndexPath is invoked, call the delegate method, passing the row data to the detail view controller.
The delegate definition will look something like:
#class MyTopLevelViewController;
#protocol MyTopLevelViewControllerDelegate <NSObject>
-(void)showDetail:(DetailObject *)detail;
#interface MyTopLevelViewController : UIViewController
#property (nonatomic, weak) id <MyTopLevelViewControllerDelegate> delegate;
#end
and adding the delegate to the detail view controller header:
#interface MyDetailViewController : UIViewController <MyTopLevelViewControllerDelegate>
If you are willing to pass the data on another view controller in didSelectRowAtIndexPath on same screen, you can use array as you get "objectAtIndex:indexPath.row". Following code might help you:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
DetailFoodViewController *detailFoodViewController=[[DetailFoodViewController alloc] initWithNibName:#"DetailFoodViewController" bundle:nil];
JSCategory *jSCategory=[self.categoryResult.JSCategories objectAtIndex:indexPath.row];
detailFoodViewController.jsCategory=jSCategory;
detailFoodViewController.oldStoreLocationId=self.oldStoreId;
[self.view addSubview:detailFoodViewController.view];
[detailFoodViewController release];
}