Question

当我启用“Zombie Objects”时，我收到此错误（“ViewController respondsToSelector：]：发送到解除分配的实例的消息”）。我发现错误在哪里，但我不知道如何解决它。

这是代码：的 ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UISearchDisplayDelegate, UISearchBarDelegate>{


    // The saved state of the search UI if a memory warning removed the view.
    NSString        *savedSearchTerm;
    NSInteger       savedScopeButtonIndex;
    BOOL            searchWasActive;
}

@property (nonatomic, copy) NSString *savedSearchTerm;
@property (nonatomic) NSInteger savedScopeButtonIndex;
@property (nonatomic) BOOL searchWasActive;

ViewController.m

...
// when I comment out "viewDidDisappear" everything is ok, how to solve this on different way?
- (void)viewDidDisappear:(BOOL)animated
{
    // save the state of the search UI so that it can be restored if the view is re-created
    self.searchWasActive = [self.searchDisplayController isActive];
    self.savedSearchTerm = [self.searchDisplayController.searchBar text];
    self.savedScopeButtonIndex = [self.searchDisplayController.searchBar selectedScopeButtonIndex];
}...

感谢您的帮助

Answer 1

你在做什么来“创造”这个错误？

我的情况是，我将ViewController从导航堆栈中弹出，并且仍然有NSNotifications发送到此VC。我只是忘了删除所有VC的观察者。

Answer 2

您应该在覆盖的开头放置[super viewDidDisappear：animated]，因为这是默认实现。忘记这一行有时会导致问题。

编辑：

我认为您可能需要发布更多代码。关键可能在于你正在做或不做的其他事情。

Answer 3

/*
- (void)viewDidDisappear:(BOOL)animated
{
    // save the state of the search UI so that it can be restored if the view is re-created
    self.searchWasActive = [self.searchDisplayController isActive];
    self.savedSearchTerm = [self.searchDisplayController.searchBar text];
    self.savedScopeButtonIndex = [self.searchDisplayController.searchBar selectedScopeButtonIndex];
}
*/

ViewController respondsToSelector：]：发送到解除分配的实例的消息

3 个答案: