日志报错Can't add self as subview

#pragma mark- add 20151112 导航动画时间太短导致崩溃，重写UINavigationcontroller以下相关方法

- (id)navigationLock; ///< Obtain "lock" for pushing onto the navigation controller

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated navigationLock:(id)navigationLock; ///< Uses a horizontal slide transition. Has no effect if the view controller is already in the stack. Has no effect if navigationLock is not the current lock.

- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated navigationLock:(id)navigationLock; ///< Pops view controllers until the one specified is on top. Returns the popped controllers. Has no effect if navigationLock is not the current lock.

- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated navigationLock:(id)navigationLock; ///< Pops until there's only a single view controller left on the stack. Returns the popped controllers. Has no effect if navigationLock is not the current lock.

.m文件

#pragma mark- add 20151112 导航动画时间太短导致崩溃，重写以下相关方法

- (id)navigationLock

{

return self.topViewController;

}

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated navigationLock:(id)navigationLock

{

if (!navigationLock || self.topViewController == navigationLock)

[self pushViewController:viewController animated:animated];

}

- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated navigationLock:(id)navigationLock

{

if (!navigationLock || self.topViewController == navigationLock)

return [self popToRootViewControllerAnimated:animated];

return @[];

}

- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated navigationLock:(id)navigationLock

{

if (!navigationLock || self.topViewController == navigationLock)

return [self popToViewController:viewController animated:animated];

return @[];

}