Ashish Agarwal Ashish Agarwal - 5 months ago 158
Objective-C Question

Using presentViewController from UIView

I am creating a title bar for my iOS application and I am making this inside a UIView. The only issue I am having is with the "home button". When the home button is pressed, it needs to go to the home page, which is ViewController.

However, it doesn't look as if

[self presentViewController:vc animated:NO completion:NULL];
works for UIView.

How do I work around this problem ?

- (void) createTitlebar {

CGRect titleBarFrame = CGRectMake(0, 0, 320, 55);

//Create the home button on the top right of the page. When clicked, it will navigate to the home page of the application
homeButton = [UIButton buttonWithType:UIButtonTypeCustom];
homeButton.frame = CGRectMake(275, 10, 40, 40);
[homeButton setTag:1];
[homeButton setImage:[UIImage imageNamed:@"homeIcon.png"] forState:UIControlStateNormal];
[homeButton addTarget:self action:@selector(homeButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:homeButton];
}

- (IBAction)homeButtonPressed:(id)sender{

//Transition to the submit button page
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
ViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
[vc setModalPresentationStyle:UIModalPresentationFullScreen];
[self presentViewController:vc animated:NO completion:NULL];
}

Answer

Only UIViewController can present another view controller, so if you need to show a viewcontroller from view there are several way, one of them is like this:

make a viewcontroller on which your parent view is situated a delegate of it

ParentView *view = [ParentView new];
...
view.delegate = self;

then, inside ParentView call method of that delegate

- (IBAction)homeButtonPressed:(id)sender {
    [self.delegate buttonPressed];
}

and then, inside your VC implement

 -(void)buttonPressed {
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    ViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"ViewController"];
    [vc setModalPresentationStyle:UIModalPresentationFullScreen];
    [self presentViewController:vc animated:NO completion:NULL];
}

If you need to keep this code inside UIView and avoid delegation you can do a trick like this (personally i don't like it but it should work)

-(void)buttonPressed{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    ViewController *vc = [storyboard      instantiateViewControllerWithIdentifier:@"ViewController"];
    [vc setModalPresentationStyle:UIModalPresentationFullScreen];
    [(UIViewController*)self.nextResonder presentViewController:vc animated:NO completion:NULL];
}
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