UIWebView is null in method called from another ViewController

Question

I have two viewControllers. ViewController1 and ViewController2.

In viewController1 I create a UIWebView called webView.

This is viewController1.h :

#import "viewController2.h"
@class viewController2

@interface viewController1 : UIViewController <UIWebViewDelegate> 
{

...

}

@property (nonatomic, strong)UIWebView *webView;

- (void)goToPerc:(float)perc;

This is viewController1.m :

- (void)viewDidLoad {

    ...

    webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    webView.delegate = self;
    webView.scrollView.delegate = self;
    [self.view addSubview:webView];

    ...

}

- (void)goToPerc:(float)perc {
    CGPoint scrollToPoint = CGPointMake(0, (int)(self.webView.scrollView.contentSize.height * (perc / 100)));
    NSLog(@"%@", webView);
    [webView.scrollView setContentOffset:scrollToPoint animated:YES];
}

This is viewController2.h :

#import <UIKit/UIKit.h>
#import "viewController1.h"

@interface viewController2 : UIViewController
{
    ...
}

This is viewController2.m :

...

- (void)blaBla
{
    viewController1 *vc1 = [[viewController1 alloc] init];
    float scrollToPerc = 50.0;
    [vc1 goToPerc:scrollToPerc];
    NSLog(@"%@", vc1); // returns viewController1 in log
}

The NSLog(@"%@", webView); in (void)goToPerc:(float)perc returns null. And the scrolling doesn't work obviously. Why? All the other functions in viewController1 don't return null on webView and viewDidLoad on viewController1 is called so webView does exist!

I also tried self.webView, no success either.

Answer 1

i think with this you are creating a new viewcontroller, insead accessing the previous one

viewController1 *vc1 = [[viewController1 alloc] init];
    float scrollToPerc = 50.0;
    [vc1 goToPerc:scrollToPerc];
    NSLog(@"%@", vc1);

you could try

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
UIViewController *vc1 = [storyboard instantiateViewControllerWithIdentifier:@"YourSecondviewcontrollerIdentifier"]; 
 float scrollToPerc = 50.0;
    [vc1 goToPerc:scrollToPerc];
    NSLog(@"%@", vc1);