Question

I have a method “someMethod” declared in OneViewController.h

@interface OneViewController
{
UIView *tempView;
..

}
-(void) someMethod ;
@end

and implemented in OneViewController.m file

@implementation OneViewController

-(void) someMethod 
{
tempView = [[UIView alloc]initWithFrame:CGRectMake(100, 50, 200, 250)];
tempView.backgroundColor = [UIColor yellowColor];
if([[self.view subviews] containsObject:tempView])
[tempView removeFromSuperView];
   else
   [self.view addsubview:tempView];

}

I want to call someMethod when present at different viewController – secondViewController

(something like [OneViewController someMethod]), So that when I get back to OneViewController I can see the changes made by someMethod.

Do I need to use appDelegate methods?

I have tried following but it doesn’t work.

neViewController *newViewController = [[OneViewController alloc] init];
[newViewController someMethod];

Thanks for any help in advance..

Answer 1

In the SecondViewController, declare a reference for OneViewController class. You can have assign property. Set the reference before you move to SecondViewController. Now with the reference, you can call the instance method [_oneView someMethod].

Edit:

Declare

OneViewController *_oneView;

Also add the assign property,

@property(nonatomic,assign) OneViewController *_oneView;

Synthesize the variable in .m file.

While showing the SecondViewController from OneViewController, just add the following line.

secondView._oneView = self;