CODEWITHSUNDEEP
iosobjective-ciphoneuiviewcontroller
liuqing
liuqing

Reputation: 31

Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior

Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior

This warning appear just once. I alloc the UIAlertView in a base:

viewController's viewDidLoad`self.alertView = [[UIAlertView alloc] initWithTitle.....`,

and

 `- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    self.alertView = nil;
}`

viewController A and viewController B inherit from the base viewController.

When this viewController A push to a viewController B the warning appear but B pop to A and A push to B again ,this warning doesn't appear.

When I use the simulator (iOS 9.2), the warning appears, but when I use an iPhone (iOS 8.2), it doesn't appear.

Upvotes: 1

Views: 2204

Answers (3)

liuqing
liuqing

Reputation: 31

Don't alloc init the alertView in viewDidLoad, alloc the alertView when you use it;

Upvotes: 2

Alexey Lobanov
Alexey Lobanov

Reputation: 102

if i right understand You define alert in Base class and need to show it only in A:Base but not in B:Base. if so here is code:

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:(BOOL)animated];
    if ([self isKindOfClass[A class]]) {
        [self presentViewController:self.alert animated:YES completion:nil]; 
    }
}

Upvotes: 0

Lumialxk
Lumialxk

Reputation: 6369

It's no need to dealloc properties in ARC.If you have some particular needs,please do this in viewWillDisappear.

Upvotes: 0

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