CODEWITHSUNDEEP
iosobjective-ccallbackobjective-c-blocksnsnotificationcenter
Mohan Ramanathan
Mohan Ramanathan

Reputation: 2209

How to end the Completion Block in Next ViewController

I am having the below block in ViewController A

dispatch_async(dispatch_get_main_queue(), ^{
    [self dismissAnimated:YES completion:^(BOOL finished) {
        [[NSNotificationCenter defaultCenter] postNotificationName:@"adjustNavBar"
                                                            object:self];
    }];
});

After the execution of 'dismissAnimated' block method the NSNotificationCenter is getting called and the Observer in ViewController B is executing the below code

- (void)viewDidLoad {
    [super viewDidLoad];
    [[NSNotificationCenter defaultCenter] addObserver:self
                            selector:@selector(adjustNavBar)
                            name:@"adjustNavBar"
                            object:nil];
}

-(void)adjustNavBar {
    [self checkForPartialScroll];
}

after execution of the above code, it is ending in ViewController A.

But i want to end the process in ViewController B. How to do this, i am newly trying this callback functions.

using Delegates or Callbacks, can i achieve what i am trying ?

Upvotes: 0

Views: 119

Answers (2)

Nguyen Hoan
Nguyen Hoan

Reputation: 1693

try post notification before dismissviewcontroller:

 [[NSNotificationCenter defaultCenter] postNotificationName:@"adjustNavBar" object:self];  

dispatch_async(dispatch_get_main_queue(), ^{
    [self dismissAnimated:YES completion:^(BOOL finished) {

    }];
});

if not work , try run checkForPartialScroll in mainthread

Upvotes: 1

user8125593
user8125593

Reputation:

write that code above your code , HomeVC name of your next VC & @"HomeVC" identifier of your next VC 

 dispatch_async(dispatch_get_global_queue(0, 0), ^{
  HomeVC *homeVC = (HomeVC *) [self.storyboard instantiateViewControllerWithIdentifier:@"HomeVC"];
    }

Upvotes: 0

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