How to notify superview of subview removal - ios

Question

I added a custom UIView to a UIViewController and after some code in the view, I want to remove this view from the UIViewController, but I am not sure how to notify the UIViewController of the UIView's removal.
I am using this method to exit from within the UIView
-(void)exit{
[self removeFromSuperview];
}
Do I need to set a listener? Any help is appreciated
I posted a detailed solution. Thanks Rage, Bill L, and FreeNickname

Answer 1

Since it is not convenient to write a code as a comment, I'll write it as an answer. This answer illustrates what #Rage suggested in his answer.
First, you create a #protocol for your CustomView and add a delegate for it. You declare that the delegate should conform to this protocol. Then in your ViewController you implement your protocol and set ViewController as a delegate of your CustomView.
Like so:
CustomView.h:
#protocol CustomViewDelegate<NSObject>
//You can also declare it as #optional. In this case your delegate can
//ignore this method. And when you call it, you have to check, whether
//your delegate implements it or not.
-(void)viewWasRemoved:(UIView *)view
#end
#interface CustomView: UIView
#property (nonatomic, weak) id<CustomViewDelegate> delegate;
#end
CustomView.m:
#implementation CustomView
-(void)exit {
[self removeFromSuperview];
//if your method is NOT #optional:
[self.delegate viewWasRemoved:self];
//if it IS #optional:
if ([self.delegate respondsToSelector:#selector(viewWasRemoved:)]) {
[self.delegate viewWasRemoved:self];
}
}
#end
ViewController.m:
#import "CustomView.h"
#interface ViewController()<CustomViewDelegate>
#end
#implementation ViewController
-(void)someMethod {
self.customView.delegate = self;
}
-(void)viewWasRemoved:(UIView *)view {
//Whatever
}
#end

Answer 2

Use delegation. Add a protocol to your custom View which implements a method to notify the removal of the subview.
Make the View controller the delegate while adding the custom view. In your custom class call the delegate method right before [self removeFromSuperview];

Answer 3

Set up a delegate for it, with a method called viewWasRemoved: or something similar. Set your view's delegate to be the ViewController you want to notify, and then in your exit method, call [self.delegate viewWasRemoved:self];, which will then kick off the viewWasRemoved: method in your ViewController, where you can do any relevant work you need to do once the view is removed.

Answer 4

I'll post a detailed solution in case it helps anyone out, or if anyone can offer any pointers. Thanks Rage, Bill L, and FreeNickname:
The answer is to use delegation
First I imported the superview to the .h of my subview:
#import "ViewController.h"
Then I add a delegate id to the same file:
#property (weak) id delegate;
Then when initializing the custom UIView in the superview, I set the delegate:
CustomView *view = [[CustomView alloc]initWithFrame:frame];
view.delegate = self;
I add this method in the superview for a callback:
- (void) viewWasRemoved: (UIView *) view{
NSLog(#"removed");
}
Then finally call the method in my subView:
-(void)exit{
[self.delegate viewWasRemoved:self];
[self removeFromSuperview];
}