Can't Add Self as Subview 崩溃解决办法

[self.view addSubview:self.view];

#import "UINavigationController+Consistent.h"#import /// This char is used to add storage for the isPushingViewController property.static char const * const ObjectTagKey = "ObjectTag";@interface UINavigationController ()@property (readwrite,getter = isViewTransitionInProgress) BOOL viewTransitionInProgress;@end@implementation UINavigationController (Consistent)- (void)setViewTransitionInProgress:(BOOL)property {    NSNumber *number = [NSNumber numberWithBool:property];    objc_setAssociatedObject(self, ObjectTagKey, number , OBJC_ASSOCIATION_RETAIN);}- (BOOL)isViewTransitionInProgress {    NSNumber *number = objc_getAssociatedObject(self, ObjectTagKey);    return [number boolValue];}#pragma mark - Intercept Pop, Push, PopToRootVC/// @name Intercept Pop, Push, PopToRootVC- (NSArray *)safePopToRootViewControllerAnimated:(BOOL)animated {    if (self.viewTransitionInProgress) return nil;    if (animated) {        self.viewTransitionInProgress = YES;    }    //-- This is not a recursion, due to method swizzling the call below calls the original  method.    return [self safePopToRootViewControllerAnimated:animated];}- (NSArray *)safePopToViewController:(UIViewController *)viewController animated:(BOOL)animated {    if (self.viewTransitionInProgress) return nil;    if (animated) {        self.viewTransitionInProgress = YES;    }    //-- This is not a recursion, due to method swizzling the call below calls the original  method.    return [self safePopToViewController:viewController animated:animated];}- (UIViewController *)safePopViewControllerAnimated:(BOOL)animated {    if (self.viewTransitionInProgress) return nil;    if (animated) {        self.viewTransitionInProgress = YES;    }    //-- This is not a recursion, due to method swizzling the call below calls the original  method.    return [self safePopViewControllerAnimated:animated];}- (void)safePushViewController:(UIViewController *)viewController animated:(BOOL)animated {    self.delegate = self;    //-- If we are already pushing a view controller, we dont push another one.    if (self.isViewTransitionInProgress == NO) {        //-- This is not a recursion, due to method swizzling the call below calls the original  method.        [self safePushViewController:viewController animated:animated];        if (animated) {            self.viewTransitionInProgress = YES;        }    }}// This is confirmed to be App Store safe.// If you feel uncomfortable to use Private API, you could also use the delegate method navigationController:didShowViewController:animated:.- (void)safeDidShowViewController:(UIViewController *)viewController animated:(BOOL)animated {    //-- This is not a recursion. Due to method swizzling this is calling the original method.    [self safeDidShowViewController:viewController animated:animated];    self.viewTransitionInProgress = NO;}// If the user doesnt complete the swipe-to-go-back gesture, we need to intercept it and set the flag to NO again.- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {    id tc = navigationController.topViewController.transitionCoordinator;    [tc notifyWhenInteractionEndsUsingBlock:^(id context) {        self.viewTransitionInProgress = NO;        //--Reenable swipe back gesture.        self.interactivePopGestureRecognizer.delegate = (id)viewController;        [self.interactivePopGestureRecognizer setEnabled:YES];    }];    //-- Method swizzling wont work in the case of a delegate so:    //-- forward this method to the original delegate if there is one different than ourselves.    if (navigationController.delegate != self) {        [navigationController.delegate navigationController:navigationController                                     willShowViewController:viewController                                                   animated:animated];    }}+ (void)load {    //-- Exchange the original implementation with our custom one.    method_exchangeImplementations(class_getInstanceMethod(self, @selector(pushViewController:animated:)), class_getInstanceMethod(self, @selector(safePushViewController:animated:)));    method_exchangeImplementations(class_getInstanceMethod(self, @selector(didShowViewController:animated:)), class_getInstanceMethod(self, @selector(safeDidShowViewController:animated:)));    method_exchangeImplementations(class_getInstanceMethod(self, @selector(popViewControllerAnimated:)), class_getInstanceMethod(self, @selector(safePopViewControllerAnimated:)));    method_exchangeImplementations(class_getInstanceMethod(self, @selector(popToRootViewControllerAnimated:)), class_getInstanceMethod(self, @selector(safePopToRootViewControllerAnimated:)));    method_exchangeImplementations(class_getInstanceMethod(self, @selector(popToViewController:animated:)), class_getInstanceMethod(self, @selector(safePopToViewController:animated:)));}@end