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.

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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
– pbasdf, Commented Oct 28, 2017 at 11:16
Have a read of this question and the numerous answers. They explain very well how to pass data between VCs. — pbasdf
– pbasdf, Commented Oct 28, 2017 at 11:20

trungduc · Accepted Answer · 2017-10-28 11:17:05Z

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, 2017 at 11:17

trungduc

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4 Comments

Gurpal Rajput Over a year ago

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 Over a year ago

do i need to call init method too in view did load

trungduc Over a year ago

You need to make sure that myMetod of SecondViewController is called. I don't see where you call myMetod

Gurpal Rajput Over a year ago

Thanks alot i got it

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