ios - Navigation controller popViewControllerAnimated : yes is not working as expected -

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i using following line of code:

[self.navigationcontroller popviewcontrolleranimated:yes];

but not behaving in ios 7 doing in ios 6.some times not pop controller while pressing button 2- 3 times in succession.
resulting in abrupt behaviour in navigation bar , deallocating controller showing same on ui .
when press on controller results crash since controller deallocated.

[self.navigationcontroller poptorootviewcontrolleranimated:yes];

this method navigate root of navigationcontroller.

you can check viewcontroller hierachy following code.

    nslog(@"%@",self.navigationcontroller.viewcontrollers);

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