Passing variables between view controllers

Question

I am using this function to switch between views in Xcode 4.3.

[self performSegueWithIdentifier:@"NextView" sender:self];

I would like to pass some parameters between pages. How can I do that?

did u tried using Navigation Controller instead. it is really simple to pass values — WaaleedKhan, Jul 20 '12 at 10:30
no, I didn't try Navigation Controller. I use regular button and segue in the storyboard. — Bob, Jul 20 '12 at 11:12

score 39 · Accepted Answer · answered Jul 20 '12 at 10:34

39

After performSegueWithIdentifier:sender: your view controler will call

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

assuming your new view controller has some propertys to set:

if ([[segue identifier] isEqualToString:@"NextView"]) {
    MyViewController *myVC = [segue destinationViewController];
    myVC.propertyToSet = // set your properties here
}

answered Jul 20 '12 at 10:34

Pfitz

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so, I set the property like you said, and how can I read value from that property. And also, what if I need to pass multiple variables to the next view? – Bob Jul 20 '12 at 10:51
For multiple variables use multiple properties and to read from a property use ... = self.property (in your view controller where you defined that property) – Pfitz Jul 20 '12 at 11:04
I understand that, but I am not sure how to get that data in the "NextView". – Bob Jul 20 '12 at 11:11
Along the lines of Pfitz's approach, I create a method in my destination view controller to handle any initialization or customization. For example, in Pfitz's example, substitute myVC.propertyToSet with `[myVC setProperty1:self.property1 viewTitle:@"My Title" delegate:self];` – johnnyspo Jul 20 '12 at 11:22
Okay, I got that. I am just confused how can I access that variable in the NextView. Should I define a property with the same name and it will be automatically set? – Bob Jul 20 '12 at 12:03
In NextView use self.property e.g self.title – Pfitz Jul 20 '12 at 12:05

score 5 · Answer 2 · edited May 23 '17 at 12:24

5

This question has a very nice and correct explanation of passing data between view controllers:

Passing Data between View Controllers

edited May 23 '17 at 12:24

Community

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answered Jul 20 '12 at 10:28

Kaan Dedeoglu

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yes it is nice explained on that page, but they are using pushViewController for view change, but I would like to use performSegueWithIdentifier. – Bob Jul 20 '12 at 10:47

score 3 · Answer 3 · edited Apr 09 '14 at 04:04

Here is the answer from Pfitz, but I made it a little easier to understand for folks who are new to Objective-C using an example:

In your destinationViewController.h file add property setting for variable to 'receive' value from your source controller.m file
```
@property (nonatomic) int billIdReceivingVote;
```
Import your destinationViewController.h to your sourceViewController.m file:
```
// VOLViewController.m
#import "VOLVoteViewController.h
```

Add prepareForSegue method to your sourceViewController.m file and pass the variables

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    VOLVoteViewController *myDestinationViewController = [segue destinationViewController];

    // myDestinationViewController.variable = sourceViewController variabe
    myDestinationViewController.billIdReceivingVote = [self.idOfBillSelected intValue];
}

Passing variables between view controllers

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