i have worked on this project for a couple of months and i have only been programming for about a year so im not to smart on this subject so please be patient, i have create a login with Facebook and once i fetch the user info i have created a method to parse the info to the login view
and i place this method in the
and this method pushes to the loginViewController once it has received the info, im try to pass the same info to the settingViewController to show the name and the pic which is user.name and user.id and i did the same steps and use the same protocols and it doesnt work now my question is, because im useing the info in the loginViewController i cant place or use them in the settingViewController because im using the info already. could you please help me out with this i have only just in the last month sort of rapped my head around using protocols.
Make sure you have set an identifier for the segue:
and set profilePicture (your case) as a public property in the 2nd view controller.
Then in your 1st view controller, simply use prepareForSegue: to pass your profilePicture property:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"SecondVCSegue"]) {
SecondViewController *secondVC = segue.destinationViewController;
secondVC.profilePicture = profilePicture;
}
}
UPDATE:
have you identified the view controller in your storyboard ?
Store all your fetched data in an custom class and pass the object to your destination view controller using
(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
using something like this here UBO is my Custom class and user is facebook user object... that object contains id, image and email address..
UBO = [[UserBusinessObject alloc]init];
UBO.userid=user.id;
NSLog(#"%#",UBO.userid);
UBO.email=[user objectForKey:#"email"];
NSLog(#"%#",UBO.email);
NSString *imageUrl=[NSString stringWithFormat:#"http://graph.facebook.com/%#/picture?type=normal",UBO.userid];
NSLog(#"%#image returning",imageUrl);
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]];
//NSLog(#"image data %#",imageData);
UBO.profilePic=imageData;
Related
I'm having trouble transferring data between a table view controller and another view controller.
On my sending controller - tableviewcontroller.m - I have this under prepareForSegue:
FriendDetailViewController *fvc = (FriendDetailViewController *)segue.destinationViewController;
NSIndexPath *path = [self.tableView indexPathForSelectedRow];
PFUser *u = self.friends[path.row];
fvc.nameLabel.text = u.username;
//friendViewController.m (the destination view controller)
- (void)viewWillLoad {
[super viewDidLoad];
if (self.user) {
self.nameLabel.text = self.user.username;
}else{
self.nameLabel.text = #"No data to display";
}
}
The label displays "No data to display".
I've read other posts and viewed tutorials but I cannot figure this out.
You're only setting the nameLabel in your prepareForSegue, not the actual user, so it is uninstantiated when your new VC loads.
Try adding this into your prepareForSegue:
fvc.user = u;
Assuming your user you want to pass is stored in u, that should do it (also assuming user is a public property of the new view controller.)
You can put an attribute in your .h file of FriendDetailViewController and the set it before calling:
fvc.attribute = u.username;
After this, you can call pushViewController for "fvc" inside didSelectRowAtIndexPath
You can't set the UI actions on prepareForSegue.
You could instead define the user variable on destination viewcontroller.
After that, on prepareForSegue, you can set the selected PFUser to the destination viewcontroller's user.
And when you'd like to show the user's name, use viewWillAppear instead of viewWillLoad.
If you can't understand, please let me know, I can show detailed code for all.
This question already has answers here:
Passing data between view controllers
(45 answers)
Closed 7 years ago.
I need to pass data between two ViewControllers but without UIButton, in a few words, I need to access a variable which is in other ViewController.
My code is:
LoginViewController *lvc;
NSString name=lvc.name;
This specific case might be a little easier than delegates.
From what I see, you're trying to pass login credentials (name/login/password/something). I would use two things depending on the actual matter here.
Either NSUserDefaults or -performSegueWithIdentifier:
NSUserDefaults is a file that is loaded in every app that you can read and edit, simply using the following commands :
Setting a variable :
NSString *aName;
[[NSUserDefaults standardUserDefaults]setObject:aName forKey:#"userName"];
Getting a variable :
NSString *aName = [[NSUserDefaults standardUserDefaults]objectForKey:#"userName"];
Note that you can save the following objects NSDictionary, NSArray, NSString, NSNumber, NSData, and probably a couple that I'm forgetting but someone can edit if I do.
Note that this file is loaded at every startup, so you don't wanna use that as a database but more of a small-sized storage easy to use, like for user name, preferences/settings, and stuff like that.
The other way is using performsegue between two controllers, but that requires storyboards.
Drag a segue between two of your controllers, name it (for example) fromLoginToHome. I'm assuming that the flow goes from the login controller to the home controller.
when you move between the two views (when the user presses "Login" for example), call this method
[self performSegueWithidentifier:#"fromLoginToHome" sender:self];
Then you'll need to implement this method, that is usually there but in a comment block (it's always like that when you create your Vc)
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if([segue.identifier isEqualToString:#"fromLoginToHome"]){
HomeViewController *vc = (HomeViewController*)segue.destinationViewController;
vc.myName = _myName;
}
}
Xcode using delegate to pass data between controllers This is for child to parent by usuing delegates
And For parent to child,you can use segues simply.
HTH!enjoy Coding.
You can have a look of delegate method in here delegate. can you tell me if you are looking for delegate or not
Try using as below
FirstViewController.h
#interface FirstViewController: UIViewController
- (void)GetItNow;
FirstViewController.m
- (void)GetItNow{
NSLog(#"I acheived"); }
- (IBAction)goToSecondView:(id)sender {
SecondViewController* Second= [[SecondViewControlleralloc] initWithNibName:#"SecondViewController" bundle:nil];
rqVC.addId = self.addId;
[self.view addSubview:Second.view];
}
SecondViewController.h
#property (nonatomic, assign) id delegate;
SecondViewController.m
- (IBAction)Action_LoadFunds:(id)sender {
[self.view removeFromSuperview];
[_delegate GetItNow];
}
I am currently working on a project that requires a list of customers to be displayed in a UITableView, the associated cell then segues to a TabView to display a detailed customer record in a tabbed ui.
I have setup the story board with the required TableView and populated fine. The TabViews all setup and I have added a custom class to the main TabView controller which can take the ID (required to interrogate service and return further data) and Customer Name. I have also added a UIViewController for the first tab in which I need to get the ID value.
I can't seem to get hold of the ID or Company Name that is passed. I have tried importing the .h file of the UITabView. I know the UITabView .h file is being populated with the values as in the .m file I am using the Customer Name to update the title of the Navigation Bar. However, whenever I breakpoint on line that gets the ID in the .m file for the individual tab, it always returns nil.
I am using the following code to try and get this value:
companyTabController *headerData = [companyTabController alloc];
_companyName_lbl.text = headerData.companyName;
_companyID_lbl.text = headerData.ID;
I have tried several variations of the above and all to no avail.
You can also use NSUserDefaults to save the data, I think that is the simplest way to save the data throughout the app.
From the code you posted, the headerData is a new instance. So the companyName and the ID will be nil unless you assign some value to them.
Since, you mentioned that you are able update the navigation bar title, try using the same object for fetching the values in this controller as well. (Maybe you can use a singleton object)
If your segueing you have to use the prepareForSegue:sender: method as such:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
companyTabController *companyTC = [segue destinationViewController];
companyTC.companyName_lbl.text = headerData.companyName;
etc
}
if your not segueing you will have to instantiate it as such :
- (void) didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *selectedCell = [self.tableView cellForRowAtIndexPath:indexPath];
companyTabController *companyTC = [self.storyboard instantiateViewControllerWithIdentifier:#"CopmanyTabController"];
companyTC.companyName_lbl.text = selectedCell.textLabel.text or = headerData.companyName;
[self.navigationController pushViewController:companyTC animated:YES];
}
I'm new to Parse and iOS app development, so please excuse my question if it has an obvious answer.
In my app, the user needs to enter data across multiple views, and for resource efficiency, I am initiating the PFObject as a property in the first view and it is being handed via prepareForSegue to by each scene to its segue's destination view controller.
However, when checking the key-value pairs in the object, I noticed that they are not getting stored in the object. In the debugger, it shows the data in the "estimatedData" section. What is the cause of this? When I try to saveInBackground the object, it fails and says that the object is null.
Here is the code from the FirstViewController.h of the PFObject property declaration.
#property (strong, nonatomic) PFObject *freshChow;
I also call #synthesize freshChow; under the #implementation of the FirstViewController.m.
I later initialize the object in an IBAction when a button is tapped.
- (IBAction)StartCookingProcess:(id)sender {
freshChow = [PFObject objectWithClassName:#"FoodItems"];
[self performSegueWithIdentifier:#"Perform Init Segue" sender:self];
}
And the prepareForSegue method:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([[segue identifier] isEqualToString:#"Start Cooking Process"]) {
Chow_Type_selection *vc = [segue destinationViewController];
vc.freshChow = freshChow;
}
}
This code, with the exception of the StartCookingProcess method is repeated on the subsequent views.
Thanks,
Siddharth
I know that this is double question. I know that I can use property in toViewController to get name of UIViewController to get NSString which tells me where I am coming from.
Anyway I want to ask if there a simple way to get name of UIViewController when unwinding from segue.
I have a UIViewController with segues to 3 forms. I programatically return to that view controller. I need to run a specific code only when I am returning from one of view controllers. My goal is using string from name of fromViewController start that specific code.
Using UIViewController by NSString from its class name isn't safe enough because the name can be changed.
You can use isKindOfClass instead:
UIViewController *destinationViewController = segue.destinationViewController;
if ([destinationViewController isKindOfClass:[MyViewControllerClass1 class]]) {
// put code related to transition to MyViewControllerClass1
}
else if ([destinationViewController isKindOfClass:[MyViewControllerClass2 class]]) {
// put code related to transition to MyViewControllerClass2
}
You can use:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
UIViewController *destinationViewController = segue.destinationViewController;
NSString * identifier = destinationViewController.identifier;
NSString * title = destinationViewController.title;
}
Create a Custom delegate method in the primary VC, create 3 strings with unique name so that u can identify.
EG.
NSString* stringFrmFORM1, *stringFrmFORM2, *stringFrmFORM3;
-(void)setString:(NSString*)myString{
//set the string from the VC1,2,3 to each string based on Primary VC's strings
}
Call the delegate method from each registration VC, and set those Strings.
You will have your registration strings to each of the Unique strings that you have set, from each of the Registration VC's.
To answer your base question, you can get the name of a class in string form with:
NSString *strClassName = NSStringFromClass([fromViewController class]);
but as #AlexPeda pointed out in ze answer, -isKindOfClass: would be better.
if ([fromViewController isKindOfClass:[SpecificViewController class]]) {
//run your 'specific' code
}