继承了NavigationController，但是Push VC时有时会卡死，但是可以手势滑动。
解决方案：
@interface ZZBaseNaviController () <UINavigationControllerDelegate>
@end
@implementation ZZBaseNaviController
-
(void)viewDidLoad {
[super viewDidLoad];self.delegate = self;
}
pragma mark - UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
self.interactivePopGestureRecognizer.enabled = [self.viewControllers count] > 1;
}
@end
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