异常：无法识别的选择器发送到实例，在IOS 8中关闭视图控制器

Question

I have open another view successfully in current view using the following code

 OptionsViewController *optionView = [[OptionsViewController alloc] initWithNibName:IS_IPAD()?@"OptionsViewController_ipad":@"OptionsViewController" bundle:nil];

        [self.navigationController presentViewController:optionView animated:YES completion:Nil];

They i'm trying to dismiss current view in OptionsViewController using the following code. But im getting "unrecognized selector sent to instance" and app crashes in IOS 8 but lower version it was working fine . Please help me how to resolve .

Please check below link for exception message http://pastebin.com/R4M3MxmM

- (IBAction)cancelOption:(id)sender
    {

        [self dismissViewControllerAnimated:YES completion:Nil];
    }

Answer 1

The trace says your problem is in [LeftSideBarViewController tableView:numberOfRowsInSection:] . Apparently, you're asking for the count of something but that thing is currently a UITraitCollection which, I'm guessing, is not what you expect.

The most likely explanation is that the thing you're trying to count has been released and its memory reused.

If it's not obvious from that, run Instruments with zombies enabled and look at the retain/release history of the object involved. (Or post the code from the crashing method.)

Answer 2

:count on the object doesn't exist.

https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UITraitSet_ClassReference/index.html

UITraitCollection has no instance method called count .