Issit possible to load a UIVIewcontroller from uiview of another UIViewController

Question

I have:

an UIViewController A
UIView B: I added subview which is a UIView to the UIViewController A
an UIViewController C

What I did is:

in UIViewController A's viewDidLoad's method, I call this:

UIView *subviewB = [[Subview alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)];
[subviewB subviewBMethod]; // 
[self.view addSubview:subviewB];

SubviewBMethod code is to create an view, inside this view have a button. Once this button is clicked, it will change to UIViewController C.

I tried this:

[self presentModalViewController:self.UIViewControllerC animated:YES];

And I got this error message:

warning: incompatible Objective-C types 'struct UIViewControllerC *', expected 'struct UIViewController *' when passing argument 1 of 'presentModalViewController:animated:' from distinct Objective-C type

When I run the app, it terminates immediately when I click the button, I opened the console bug, there is no any error message. My method must be wrong, thus my question is:

Is it possible to load a UIVIewcontroller from UIView of another UIViewController? If:

Yes: How to do it?
No: What should I do?

score 1 · Answer 1 · answered Jan 13 '11 at 05:45

1

It looks like you have a declaration like this:

 UIViewControllerC *UIViewControllerC;
                 ^

When you want:

 UIViewController *UIViewControllerC;

answered Jan 13 '11 at 05:45

Hack Saw

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I think UIViewControllerC really is what he wants, since it is his custom subclass. Declaring it that way will make him have to cast it every time he calls a custom method on his view controller. – Altealice Jan 13 '11 at 05:58
Oh, of course... But isn't it odd that you'd need to coerce it? If it's an subclass of UIViewController, the system would note that, and accept it, wouldn't it? – Hack Saw Jan 13 '11 at 06:06
Hi, I have both declared UIViewController A and C as @property(nonatomic, retain) type, syntesize and release it, but it still have the same warning message. Is it because UIView cant call this function: [self presentModalViewController:self.UIViewControllerC animated:YES];?? – chako89 Jan 13 '11 at 07:17

score 1 · Answer 2 · edited May 23 '17 at 12:26

I've recently done the same thing. - I have a viewControllerA that has a seeMoreView (a custom view) on it. When the user clicks "see more", viewControllerB is presented.

I solved it like this:

I subclassed seeMoreView.
I declared a delegate in the seeMoreView - syntax in this answer: Delegates Vs. Notifications in iPhoneOS
In viewControllerA I set the delegate of the seeMoreView as self when creating the view.
In viewControllerA I implement the delegate method, which presents viewControllerB.

(I don't think it's good practice in the MVC paradigm to call a view controller from a view.)

score 0 · Answer 3 · answered Jan 13 '11 at 05:42

0

Can you try this?

[self presentModalViewController:(UIViewController *)self.UIViewControllerC animated:YES];

answered Jan 13 '11 at 05:42

Altealice

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What? Are you sure self isn't pointing to a UIViewController? Because that should give a different error. Can you post your exact code so we can check? – Altealice Jan 13 '11 at 11:12

Issit possible to load a UIVIewcontroller from uiview of another UIViewController

3 Answers3