How to Access instance Variable of one class to another class in objective c?

Question

this is the code for.m class of first viewcontroller[][1] I had tried accessing value of IVAR of one viewcontroller to another viewcontroller by making use of property , but i am getting null value.

please let me know how to get value displayd in my secondviewcontroller.

enter image description here

Your code is creating a new instance of the view controller (in which the property value is nil) rather than accessing the existing instance. — pbasdf, Oct 28 '17 at 11:16
Have a read of [this question](https://stackoverflow.com/q/5210535/3985749) and the numerous answers. They explain very well how to pass data between VCs. — pbasdf, Oct 28 '17 at 11:20
Possible duplicate of [Passing Data between View Controllers](https://stackoverflow.com/questions/5210535/passing-data-between-view-controllers) — pbasdf, Oct 28 '17 at 11:21
@GurpalRajput You should post your code as text, not as an image. — Dima Kozhevin, Oct 28 '17 at 15:28

score 1 · Accepted Answer · answered Oct 28 '17 at 11:17

1

You are doing the right way to get value of property. But you need to make sure myString has been assigned a value in init method of ViewController.

Try in ViewController.m:

- (instancetype)init {
    self = [super init];

    if (self) {
        self.myString = @"My String";
    }

    return self;
}

Beside of it, make sure that myMetod of SecondViewController is called. If myMetod is called, "Print value My String" will be printed.

answered Oct 28 '17 at 11:17

trungduc

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i had puted (instance)init on top of viewdidload method of viewcontroller and put code in it , but when i run app after calling of viewdidload nothing happens .. even init method is not calling – Gurpal Rajput Oct 28 '17 at 11:33
do i need to call init method too in view did load – Gurpal Rajput Oct 28 '17 at 11:34
You need to make sure that `myMetod` of `SecondViewController` is called. I don't see where you call `myMetod` – trungduc Oct 28 '17 at 11:36
Thanks alot i got it – Gurpal Rajput Oct 28 '17 at 12:10

How to Access instance Variable of one class to another class in objective c?

1 Answers1