自定义视图中的 Crasher 作为 UINavigationControllers navigationItem.titleView [英] Crasher in a custom view as UINavigationControllers navigationItem.titleView

问题描述

我有一个 UIViewController 在它的视图属性中有几个子视图(UISearchbar 和几个 UIButtons).UIButton 与典型的 IBAction 挂钩，例如 -(IBAction)buttonPressed:(id)sender 用于 UIControlEventTouchUpInside> 状态 - 我是在 IB 中还是以编程方式进行都没有关系.

I have an UIViewController with several subviews in its view property (UISearchbar and several UIButtons). The UIButtons hooked up to typical IBActions like -(IBAction)buttonPressed:(id)sender for the UIControlEventTouchUpInside state - it doesn't matter if I do it in IB or programmatically.

- (void)viewDidLoad {
    MUZTitleViewController *title = [[MUZTitleViewController alloc] 
                                     initWithNibName:nil bundle:nil];
    self.navigationItem.titleView = title.view;
}

在我的项目中还有一个 UINavigationController.当我将 UINavigationBar 的 navigationItem.titleView 设置为我的 UIViewController 视图的视图时，我一点击就收到 EXC_BAD_ACCESS 异常按钮之一.我不知道这是为什么.

In my project there's also an UINavigationController. When I set the navigationItem.titleView of the UINavigationBar to the view of my UIViewControllers view I get an EXC_BAD_ACCESS exception, as soon as I tap one of the button. I don't know why this is.

我上传了一个小示例项目来说明我的问题:Test010.xcodeproj(启用了 ARC)

I uploaded a small sample project to illustrate my problem: Test010.xcodeproj (it's ARC enabled)

我越来越得出结论，使用 UIViewController 的视图并将其分配给 titleView 并不是一个好主意，但我没有看到任何在这里替代.

More and more I come to the conclusion that it's not a good idea to use the UIViewControllers view and assign it to the titleView but I don't see any alternative here.

抱歉，示例项目注释掉了导致异常的调用.我重新上传了链接的项目文件.

Sorry, the sample project commented out the call which causes the exception. I reuploaded the linked project file.

编辑^2:正如 PengOne 指出的那样，我跳过了我收到的确切错误消息:

Edit^2: As PengOne pointed out I've skipped the exact error message I got:

2011-09-10 23:09:50.621 Test010[78639:f803] -[CALayer buttonPressed:]: unrecognized selector sent to instance 0x9254ae0
2011-09-10 23:09:50.623 Test010[78639:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[CALayer buttonPressed:]: unrecognized selector sent to instance 0x9254ae0'

推荐答案

您是否尝试将 NSZombieEnabled 设置为 YES?如果我这样做，控制台会显示以下输出:

Have you tried setting NSZombieEnabled to YES? If I do this, the console shows the following output:

2011-09-10 22:56:23.329 Test010[6481:ef03] *** -[MUZTitleViewController
performSelector:withObject:withObject:]: message sent to deallocated 
instance 0x7a7ff70

由于项目启用了 ARC，控制器似乎在此行之后的某个时间被释放:

As the project is ARC enabled, the controller seems to get deallocated some time after this line:

MUZTitleViewController *title = [[MUZTitleViewController alloc] initWithNibName:nil bundle:nil];

我不确定最好的解决方案是什么，但一个属性肯定有助于防止像这样的异常:

I am not sure what the best solution is, but a property definitely helps to prevent the exception like so:

// MUZDetailViewController.h
@property (strong, nonatomic) MUZTitleViewController *title;

// MUZDetailViewController.m
@synthesize title;

self.title = [[MUZTitleViewController alloc] initWithNibName:nil bundle:nil];
self.navigationItem.titleView = title.view;

这篇关于自定义视图中的 Crasher 作为 UINavigationControllers navigationItem.titleView的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！