CODEWITHSUNDEEP
iosobjective-ciphoneuiview
Fai Fabio
Fai Fabio

Reputation: 19

iOS Exception of adding NSNotificationCenter to a UIView

I added a NSNotificationCenter to a UIView, when I first go to the page, the NSNotificationCenter work fine. However, when I left that page and back to that page again, it will give out error 

'NSInvalidArgumentException', reason: '-[UITextMagnifierTimeWeightedPoint updateProfile:]: unrecognized selector sent to instance.

Here are the code.

UIView1 :

- (void)changeUIView {
    UIView2 *view = [[UIView2 alloc] init];
    // show UIView2
}

UIView2 :

- (id)init {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateProfile:) name:@"updateProfile" object:nil];
    return self;
}

-(void)updateProfile:(NSNotification *)notification {
    // do something
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:@"updateProfile"];
}

- (void)buttonClick {
    [[NSNotificationCenter defaultCenter] postNotificationName:@"updateProfile" object:nil userInfo:nil];
}

Upvotes: 0

Views: 293

Answers (2)

Flexicoder
Flexicoder

Reputation: 8511

You need to remove self as the observer not the selector you are using to handle the notification

[[NSNotificationCenter defaultCenter] removeObserver:self];

Or if you want to be specific you can use

[[NSNotificationCenter defaultCenter] removeObserver:self name:@"updateProfile" object:nil];

Upvotes: 3

Fahim Parkar
Fahim Parkar

Reputation: 31647

Always

Add NSNotificationCenter in viewDidAppear

And

Remove NSNotificationCenter in viewDidDisAppear

Upvotes: 1

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