I am trying to pass an image from my TableViewController to a DetailViewController. My problem is a logic problem i guess because Xcode doesn't show any error in my code. When i tap on any row and takes me to the DetailView, the DetailView shows nothing and i want the DetailView to show me the image i am passing.
My TableViewController.h
#import <UIKit/UIKit.h>
#import "CustomCellControllerCell.h"
#import "DetailViewController.h"
#interface ListViewController : UITableViewController
#property (nonatomic) NSArray *foodImgArray;
#property (nonatomic) NSArray *foodTitleArray;
#end
My TableViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
self.foodTitleArray = #[#"manito",
#"jatito",
#"dolorsito",
#"pajarito",
#"calalito",
#"chinguito"];
self.foodImgArray = #[#"ajigallina.jpg",
#"anticucho.jpg",
#"causaRellena.jpg",
#"anticucho.jpg",
#"anticucho.jpg",
#"anticucho.jpg"];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"detailView"]) {
DetailViewController *dvc = [segue destinationViewController];
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
dvc.passedImage.image = [UIImage imageNamed:[self.foodImgArray objectAtIndex:indexPath.row]];
}
}
My DetailViewController.h
#import <UIKit/UIKit.h>
#interface DetailViewController : UIViewController
#property (weak, nonatomic) IBOutlet UIImageView *detailImage;
#property (nonatomic) UIImageView *passedImage;
#end
And my DetailViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.detailImage.image = self.passedImage.image;
}
why dont you just pass a image
like--
dvc.image=[UIImage imageNamed:[self.foodImgArray objectAtIndex:indexPath.row]];
and set that image to detailImage in DetailViewController like--
self.detailImage.image = self.image
try to put some break point to check if image in not nil in DetailViewController.
Related
I'm just a beginner in iOS Devp and stuck with this problem since last 2days. What I am trying to do is I've two view controllers, the first View Controller consists of 2 buttons and I want to load a specific type of data in next View controller on respective button action.
What I did is as follows :
I've two ViewControllers connected using segue with id "showDetailSegue",
1. ViewController
2. SecondVC
I want to update label on SecondVC when the button on ViewController is tapped.
//ViewController.h
#import <UIKit/UIKit.h>
#import "SecondVC.h"
#interface ViewController : UIViewController
#property (weak, nonatomic) IBOutlet UITextField *textField;
#end
//ViewController.m
#import "ViewController.h"
#import "SecondVC.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
NSString *str = #"my string data..";
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if([segue.identifier isEqualToString:#"showDetailSegue"]){
SecondVC *controller = segue.destinationViewController;
controller.getString = str;
controller.testLabel.text = str;
}
}
#end
//SecondVC.h
#import <UIKit/UIKit.h>
#interface SecondVC : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *testLabel;
#property (nonatomic, strong) NSString *getString;
#end
//SecondVC.m
Please help me with a straightforward and clear explanation.
Thanks in advance.!
There are many ways to pass data to desired ViewController.
1. Using segue
Let suppose you have to pass a string to another VC.
#import "ViewController.h"
#import "SecondVC.h"
#interface ViewController ()
// all instance global variable should be declare here
NSString str;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
str = #"my string data..";
}
// segue delegate method
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"segueIdentifireName"]) {
SecondVC *destViewController = segue.destinationViewController;
destViewController.getString = str;
}
}
#end
Now you must have to create NSString object inside destinationVc .h file like below.
#interface SecondVC : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *testLabel;
#property (nonatomic, strong) NSString *getString;
#end
Inside .m file get string data like:
#interface ViewController ()
#end
#implementation SecondVC
- (void)viewDidLoad {
[super viewDidLoad];
self.testLabel.text = getString; // we passed `str` data inside `getString` object so it can be refelect here using `getString` variable.
NSLog(#"string data %#", getString);
}
2. Using storyboard id:
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"MainStoryboard" bundle:nil];
YourViewControllerClassName *vc = [mainStoryboard instantiateViewControllerWithIdentifier:#"viewContIdentifire"];
vc.getString = str;
[self.navigationController pushViewController:vc animated:YES];
Inside .h file:
#property (nonatomic, strong) NSString *getString;
Inside .m file get string data like:
NSLog(#"string data %#", getString);
In Swift3
let controller = UIStoryboard().getControllerInstance(storyBoardName: "MainStoryboard", identifire: "viewContIdentifire")
controller.getString = str;
self.navigationController?.pushViewController(controller, animated: true)
To get data back:
Create protocol where you need to send data back.
// dec var on top
var delegate: YourDelegate!
protocol YourDelegate {
func delegateFunction(value: String)
}
Call delegate func on tap action:
delegate.delegateFunction(value: "My sample string")
Receiving controller
Confirm the delegate to self when navigate
Implement the YourDelegate on top.
func delegateFunction(value: String){
print("Got: ", value)
}
3. Using NSUserDefaluts (Not recommended).
4. Using local DB.
I have this Segue here:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:#"showDetail"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
//NSDate *object = self.objects[indexPath.row];
NSString *strPOIndex = [self.tableData[indexPath.row] valueForKey:#"POIndex"];
LHPurchaseOrderDetail *controller = (LHPurchaseOrderDetail *)[[segue destinationViewController] topViewController];
[controller setDetailItem:strPOIndex];
controller.navigationItem.leftBarButtonItem = self.splitViewController.displayModeButtonItem;
controller.navigationItem.leftItemsSupplementBackButton = YES;
}
}
and what I am trying to do with it is pass strPOIndex to setDetailItem in my detail controller from my master controller.. but when I run this, I get an error:
-[LHPurchaseOrderMaster setDetailItem:]: unrecognized selector sent to instance 0x156cce80
I dont understand why this is happening, is it an issue with my storyboard? or my master controller or detail controller? Here is my Detail Controller:
.h:
#import <UIKit/UIKit.h>
#interface LHPurchaseOrderDetail : UIViewController
#property (strong, nonatomic) IBOutlet UINavigationBar *NavBar;
#property (strong, nonatomic) id detailItem;
#property (weak, nonatomic) IBOutlet UILabel *detailDescriptionLabel;
#end
.m:
#import "LHPurchaseOrderDetail.h"
#interface LHPurchaseOrderDetail ()
#end
#implementation LHPurchaseOrderDetail
- (void)setDetailItem:(id)newDetailItem {
if (_detailItem != newDetailItem) {
_detailItem = newDetailItem;
// Update the view.
[self configureView];
}
}
- (void)configureView {
// Update the user interface for the detail item.
if (self.detailItem) {
self.detailDescriptionLabel.text = [self.detailItem description];
}
}
- (void)viewDidLoad {
[super viewDidLoad];
[self configureView];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
#end
Master Controller:
.h
#import <UIKit/UIKit.h>
#import "ShinobiDataSource.h"
#import "PopupGenerator.h"
#class LHPurchaseOrderDetail;
#interface LHPurchaseOrderMaster : UITableViewController<UIPopoverControllerDelegate, UIPickerViewDelegate>
#property (strong, nonatomic) IBOutlet UIButton *communityBtn;
#property (strong, nonatomic) IBOutlet UIButton *lotBtn;
#property (strong, nonatomic) IBOutlet UIButton *goBtn;
- (IBAction)communityBtnPressed:(id)sender;
- (IBAction)lotBtnPressed:(id)sender;
- (IBAction)goBtnPressed:(id)sender;
#property(nonatomic, retain) NSArray * tableData;
#property (strong, nonatomic) LHPurchaseOrderDetail *purchaseOrderController;
#end
Your error is this:
-[LHPurchaseOrderMaster setDetailItem:]: unrecognized selector sent to instance 0x156cce80
so it seems that somewhere in your LHPurchaseOrderMaster class you're trying to access and set the detailItem property as if it would be a part of LHPurchaseOrderMaster but because it doesn't exist there, you get an unrecognized selector error.
Edit
You should check for three things:
In Interface Builder check that the segue from LHPurchaseOrderMaster ViewController is to an UINavigationController that embeds the LHPurchaseOrderDetail ViewController as the first view controller in its stack.
Check the Class name returned by [segue destinationViewController]topViewController] like this:
id obj = [segue destinationViewController]topViewController];
NSLog(#"%#", NSStringFromClass([obj class]));
The class name should be LHPurchaseOrderDetail. If it's not, then you have a problem in your Storyboard where more than certainly you've connected the segue wrong.
Check your LHPurchaseOrderMaster class for any code that tries to access the "detailItem" property as if it would be part of this class.
It seems that the property you are trying to access is not accessible (wrong retrieved object).
Have you tried to use instead of
LHPurchaseOrderDetail *controller = (LHPurchaseOrderDetail *)[[segue destinationViewController] topViewController];
Something like
LHPurchaseOrderDetail *controller = (LHPurchaseOrderDetail *)[[segue destinationViewController] viewControllers][0];
I had sometimes the same your issue.
Set your detailItem not to NSString. Not to id. The problem is here,
self.detailDescriptionLabel.text = [self.detailItem description];
In configureView method change the code as follow,
- (void)configureView {
// Update the user interface for the detail item.
if (self.detailItem) {
self.detailDescriptionLabel.text = self.detailItem;
}
}
Don't forget to change this as well,
- (void)setDetailItem:(NSString *)newDetailItem {
if (_detailItem != newDetailItem) {
_detailItem = newDetailItem;
// Update the view.
[self configureView];
}
}
I have two storyboards and each one has its own respective view controller but I need to change the appearance of the second storyboard based on the button pressed in the first view controller.
In the first view controller I have:
// First view controller .h
#import <UIKit/UIKit.h>
#import "SecondViewController.h"
#interface FirstViewController : UIViewController
#property (strong, nonatomic) IBOutlet UIButton *LevelOneButton; // tag 0
#property (strong, nonatomic) IBOutlet UIButton *LevelTwoButton; // tag 1
-(IBAction)selectLevel:(UIButton *)sender; // both buttons connected to this method
#property (assign, nonatomic) int levelSelect;
#end
then in the first .m file:
//FirstViewController.m
-(IBAction)selectLevel:(UIButton *)sender {
if (sender.tag == 0) {
_levelSelect = 0;
}
if (sender.tag == 1) {
_levelSelect = 1;
}
}
This code works fine but the problem occurs in the secondViewController that I have. When I try and access the levelSelect property in the SecondViewController I get the errors "Property 'levelSelect' not found on object of type 'FirstViewController'" or "Unexpected identifier levelSelect" or something among those lines. I've tried every single thing I could think of and every question I found on StackOverflow relating to this but none have fixed the problem. Anyone know what I'm doing wrong?
You should be setting the property on the second view controller as you're pushing or segueing.
So in your first view controller it should look something like this:
#import "ViewController.h"
#import "SecondViewController.h"
#interface ViewController ()
#property (strong, nonatomic) IBOutlet UIButton *levelOne;
#property (strong, nonatomic) IBOutlet UIButton *levelTwo;
#property (assign, nonatomic) int selectedLevel;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.levelOne.tag = 1;
self.levelTwo.tag = 2;
}
- (IBAction)selectLevel:(UIButton *)sender
{
if (sender.tag == 1) {
self.selectedLevel = 1;
} else {
self.selectedLevel = 2;
}
[self performSegueWithIdentifier:#"pushToSecond" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
SecondViewController *dest = segue.destinationViewController;
dest.levelSelect = self.selectedLevel;
}
#end
Now, when viewDidLoad gets called on the SecondViewController that property will be set and you can use it. Like so:
#import "SecondViewController.h"
#interface SecondViewController ()
#property (strong, nonatomic) IBOutlet UILabel *levelLabel;
#end
#implementation SecondViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.levelLabel.text = [#(self.levelSelect) stringValue];
}
#end
Quick Edit, if you're not using segues you can do the same thing by pushing manually. Would look something like:
- (IBAction)selectLevel:(UIButton *)sender
{
if (sender.tag == 1) {
self.selectedLevel = 1;
} else {
self.selectedLevel = 2;
}
SecondViewController *secondVC = [[UIStoryboard storyboardWithName:#"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:#"second"];
secondVC.levelSelect = self.selectedLevel;
[self.navigationController pushViewController:secondVC animated:YES];
}
I have a table view controller called StackViewController, this is where I hold a list of todo's that has been created in CreateViewController...
I have an NSString property in StackViewController called currentTarget that represent the first to do in the stack:
import <UIKit/UIKit.h>
#interface StackTableViewController : UITableViewController
#property (nonatomic, strong) NSString *currentTarget;
#end
This property holds the first NSString object in the table view, I get it like this:
#import "StackTableViewController.h"
#import "Target.h"
#import "CoreDataStack.h"
#interface StackTableViewController () <NSFetchedResultsControllerDelegate>
#property (nonatomic, strong) NSFetchedResultsController *fetchedResultController;
#end
#implementation StackTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self.fetchedResultController performFetch:nil];
NSIndexPath *indexPath = [NSIndexPath indexPathForItem:0 inSection:0];
Target *target = [self.fetchedResultController objectAtIndexPath:indexPath];
self.currentTarget = target.body;
}
Now, when I log into my home page which called HomeViewController I want to initiate the StackTableViewController and get its currentTatget property value...
I know that there are delegate to help you notify other views when a change has happened, but in my case I want to get this property value before even I have been in this page (StackTableViewController), because the HomeViewController is the first view controller that is loaded (my initial view controller) and I what to access this property when I was just logged in to the app and populate a label with it.
How should I do this?
I thought maybe something like this:
#import "HomeViewController.h"
#import "CreateViewController.h"
#import "StackTableViewController.h"
#interface HomeViewController ()
#property (strong, nonatomic) IBOutlet UILabel *targetLabel;
#end
#implementation HomeViewController
- (void)viewDidLoad {
[super viewDidLoad];
StackTableViewController *vc = [[StackTableViewController alloc] init];
NSString *current = vc.currentTarget;
self.targetLabel.text = current;
}
But i'm missing something here...my label is not populated...
I think there is something with the views lifecycle.
i'm a newbie please help me to figure this out...thanks
Don't do anything to do with graphics in viewDidLoad. The earliest you want to do it is in viewWillAppear (most of the time) and occasionally you will need to do it in viewDidAppear.
Try the same code in viewWillAppear and it should work.
Oh right, since your other viewController is setup in viewDidLoad, you need to call
[stackTableViewController view] on your stackTableViewController after you alloc init it. Seems weird, but this actually works. This is because the StackTableViewController doesn't have its calculation done when you initialize it, it runs through it in it's viewDidLoad delegate.
- (void)viewDidLoad {
[super viewDidLoad];
StackTableViewController *vc = [[StackTableViewController alloc] init];
[vc view];
NSString *current = vc.currentTarget;
self.targetLabel.text = current;
}
i've been trying to implement this protocol for several hours and it doesn't seem to work for some reason. Basically i have a split view which has a view controller and a table controller, one class holds these two together. The main class creates an instance of the table and runs perfectly, but if i select a cell i want the view controller to react. So i wanted to create a protocol for when a table cell is selected it will do something in the main class.
TableSplitViewController, this is the main class:
#interface TableSplitViewController : UIViewController <updateView>
{
ChildrenTableViewController *firstController;
IBOutlet UITableView *firstTable;
IBOutlet UITableViewCell *tablecell;
NSString *name;
}
#property (nonatomic, strong) NSString *name;
#property (nonatomic, strong) IBOutlet UILabel *childnamelabel;
#end
THis is the TableSplitViewController.m:
- (void)viewDidLoad
{
[super viewDidLoad];
if (firstController == nil) {
firstController = [[ChildrenTableViewController alloc] initWithStyle:UITableViewStyleGrouped];
}
[firstTable setDataSource:firstController];
[firstTable setDelegate:firstController];
firstController.view = firstController.tableView;
// Do any additional setup after loading the view.
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"ShowChildrenDetails"]) {
ChildrenDetailViewController *detailViewController = [segue destinationViewController];
NSIndexPath *myIndexPath = [firstController.tableView indexPathForSelectedRow];
detailViewController.childrenDetailModel = [[NSArray alloc]
initWithObjects: [firstController.childname objectAtIndex:[firstController.index row]], nil];
}
}
- (void) setNameLabel:(NSString *)sender
{
// self.name = sender;
NSLog(#"ran");
}
This is the ChildrenTableViewController.h:
#protocol updateView <NSObject>
#required
- (void) setNameLabel:(NSString *)sender;
#end
#interface ChildrenTableViewController : UITableViewController
{
NSIndexPath *index;
id <updateView> delegate1;
}
#property (nonatomic, strong) NSMutableArray *childname;
#property (nonatomic, strong) NSIndexPath *index;
#property (retain) id delegate1;
#end
This is the critical part of ChildrenTableViewController.m:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[[self delegate1] setNameLabel:[self.childname objectAtIndex:[indexPath row]]];
NSLog(#"rannn");
As you can see in the last code i'm trying to call the method using the protocol function. It doesn't seem to work for some reason, i've put in NSLOG and it doesn't even run the setNameLabel method at all. :( Will appreciate any help offered :)
In the code above I cant see you setting the delegate as so:
- (void)viewDidLoad
{
[super viewDidLoad];
if (firstController == nil) {
firstController = [[ChildrenTableViewController alloc] initWithStyle:UITableViewStyleGrouped];
}
[firstTable setDataSource:firstController];
[firstTable setDelegate:firstController];
firstController.view = firstController.tableView;
// Set up the delegate for the controller
[firstController setDelegate1:self];
// Do any additional setup after loading the view.
}
Also, the delegate property should usually be (weak) rather than (retain).