Simple modal view delegation

msencenb · 12-05-2010, 05:26 AM

Fairly simple concept.. want to display a modal view and am having some issues with delegation. Here is what I have when I want to present the modal view:

Code:

LoginViewController *lvc = [[LoginViewController alloc] init];
	lvc.delegate = self;
	[self presentModalViewController:lvc animated:YES];
	[lvc release];

Then in that view when I want to dismiss I call:

Code:

	[self dismissModalViewControllerAnimated:YES];

I also have this in the .h file @interface of the view in which the modal view is called:

Code:

UIViewController <LoginViewControllerDelegate>

There are two errors:
"Cannot find protocol definition for LoginViewControllerDelegate"
and
"Request for member delegate is not something in structure or union"

Anyone have a solution? Thanks

Duncan C · 12-05-2010, 07:32 AM

Quote:

Originally Posted by msencenb

Fairly simple concept.. want to display a modal view and am having some issues with delegation. Here is what I have when I want to present the modal view:

Code:

LoginViewController *lvc = [[LoginViewController alloc] init];
	lvc.delegate = self;
	[self presentModalViewController:lvc animated:YES];
	[lvc release];

Then in that view when I want to dismiss I call:

Code:

	[self dismissModalViewControllerAnimated:YES];

I also have this in the .h file @interface of the view in which the modal view is called:

Code:

UIViewController <LoginViewControllerDelegate>

There are two errors:
"Cannot find protocol definition for LoginViewControllerDelegate"
and
"Request for member delegate is not something in structure or union"

Anyone have a solution? Thanks

A view controller doesn't have a delegate by default. The only reason you would need to add a delegate to your LoginViewController is because you've added a delegate property and defined a set of messages (protocol) that the delegate is supposed to handle.

Unless you're LoginViewController defines a delegate property, it doesn't have one.

Also, with this statement:

Code:

UIViewController <LoginViewControllerDelegate>

You are telling the compiler that your view controller supports a "LoginViewControllerDelegate" protocol, but it sounds like you never defined such a protocol.

Unless you have a specific reason for assigning a delegate to your LoginViewController, don't. Unless you've defined a LoginViewControllerDelegate protocol, don't tell the system that your view controller supports it. In other words, get rid of the "<LoginViewControllerDelegate>" part in the definition of your view controller.