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Check for nil viewcontroller when removing observer #75

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Check for nil viewcontroller when removing observer #75

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22 changes: 13 additions & 9 deletions STPopup/STPopupController.m
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Original file line number Diff line number Diff line change
Expand Up @@ -210,15 +210,19 @@ - (void)setupObserversForViewController:(UIViewController *)viewController

- (void)destroyObserversOfViewController:(UIViewController *)viewController
{
[viewController removeObserver:self forKeyPath:NSStringFromSelector(@selector(contentSizeInPopup))];
[viewController removeObserver:self forKeyPath:NSStringFromSelector(@selector(landscapeContentSizeInPopup))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(title))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(titleView))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(leftBarButtonItem))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(leftBarButtonItems))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(rightBarButtonItem))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(rightBarButtonItems))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(hidesBackButton))];
if (viewController != nil) {
[viewController removeObserver:self forKeyPath:NSStringFromSelector(@selector(contentSizeInPopup))];
[viewController removeObserver:self forKeyPath:NSStringFromSelector(@selector(landscapeContentSizeInPopup))];
if (viewController.navigationItem != nil) {
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(title))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(titleView))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(leftBarButtonItem))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(leftBarButtonItems))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(rightBarButtonItem))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(rightBarButtonItems))];
[viewController.navigationItem removeObserver:self forKeyPath:NSStringFromSelector(@selector(hidesBackButton))];
}
}
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
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