Container View Controllers - notify parent of action

Question

Say I have a custom container view controller (MainViewController) where I do something like this:

- (void)viewDidLoad
{
    [super viewDidLoad];        

           


        

Answer 1

You can either use delegate or block;

Using delegate

Create a protocol :

@protocol SomeProtocol 
- (void)someAction; 
@end 

Just declare a delegate in HomeViewController.h like this:

id delegate; 

and then in MainViewController's viewDidLoad set it like this:

homeVC.delegate = self;
//some where in MainViewController implement the protocol method
-(void)someAction
{
    //do something
}

then when you press the button in homeVC, just simply call:

if ([self.delegate respondsToSelector:@selector(someAction)]) {
    [self.delegate someAction];
}

Using Block:

In HomeViewController.h declare a block property:

typedef void (^ActionBlock)();

@property (nonatomic, copy) ActionBlock block;

then in MainViewController ViewDidLoad:

homeVC.block = ^(){
    //do something
};

then when you press the button in homeVC, just simply call:

self.block();