代表被送到错课 [英] Delegate Being Sent To Wrong Class

问题描述

我将导航栏分类，使标题视图可以点击。当点击时，它将显示另一个视图控制器。我在导航栏中创建一个协议，这将告诉导航控制器已经点击了标题视图。以下是我的导航栏的定义：

NavigationBar.h：

  @protocol NavigationBarDelegate; 
 
 @interface NavigationBar：UINavigationBar 
 {
 id  BOOL _titleClicked; 
} 
 
 @property（nonatomic，assign）id< NavigationBarDelegate>代表; 
 
 @end 
 
 @protocol NavigationBarDelegate 
 @optional 
  - （void）titleButtonClicked：（BOOL）titleClicked; 
 @end 
  

委托实现一个可选方法。 .m 文件如下：

NavigationBar.m：

  @implementation NavigationBar 
 
  - （id）initWithFrame：（CGRect）frame 
 {
 self = [super initWithFrame：frame]; 
 if（self）{
 _titleClicked = 0; 
} 
 return self; 
} 
 
  - （void）drawRect：（CGRect）rect 
 {
 self.tintColor = [UIColor colorWithRed：（111 / 255.f）green :( 158 / 255.f）blue：（54 / 255.f）alpha：（255 / 255.f）]; 
 
 UIImage * image = [UIImage imageNamed：@titlelogo.png]; 
 
 UIButton * titleButton = [[UIButton alloc] initWithFrame：CGRectMake（0，0，image.size.width，image.size.height）]; 
 titleButton.backgroundColor = [UIColor colorWithPatternImage：image]; 
 [titleButton addTarget：self action：@selector（titleButton :) forControlEvents：UIControlEventTouchUpInside]; 
 
 // self.navigationController.delegate = self; 
 [self.topItem setTitleView：titleButton]; 
 
 [super drawRect：rect]; 
} 
 
  - （void）titleButton：（UIButton *）sender 
 {
 _titleClicked =！_titleClicked; 
 [self.delegate titleButtonClicked：_titleClicked]; 
} 
  

这将创建一个带有徽标的导航栏，并调用当点击标题按钮时，使用titleButton 方法。一切都很好，直到这里，导航栏显示得很好。

在我的 RootViewController 中：

  NavigationBar * navigationBar = [[NavigationBar alloc] initWithFrame：CGRectMake（0.0f，0.0f，self.view.frame.size.width，44.0f ）]; 
 navigationBar.delegate = self; 
 [self.navigationController setValue：navigationBar forKey：@navigationBar]; 
  

titleButtonClicked 的实现也在那里。当我点击标题视图时，我收到以下错误： - [UINavigationController titleButtonClicked：]：无法识别的选择器发送到实例

为什么我得到 titleButtonClicked 发送到 UINavigationController ？我的导航控制器有什么需要做的吗？我只是使用简单的旧的 UINavigationController 。我还需要进行子类化吗？如果是这样，为什么？

编辑：

致电 po self.delegate 在 [self.delegate titleViewClicked：_titleClicked]; 在 NavigationBar.m 得到以下结果。代表如何改变其类型？如何解决这个问题？

 （lldb）po self.delegate 
（objc_object *）$ 1 = 0x07550170< UINavigationController：0x7550170> 
  

解决方案

您的委托和 UINavigationBar 的委托属性。重新命名您的代表以消除他们的歧视。

I subclassed my navigation bar, making the title view clickable. When clicked, it will present another view controller. I am creating a protocol in the navigation bar, that will tell the navigation controller that the title view has been clicked. Here is how my navigation bar is defined:

NavigationBar.h:

@protocol NavigationBarDelegate;

@interface NavigationBar : UINavigationBar
{
    id <NavigationBarDelegate> delegate;
    BOOL _titleClicked;
}

@property (nonatomic, assign) id <NavigationBarDelegate> delegate;

@end

@protocol NavigationBarDelegate
@optional
- (void)titleButtonClicked:(BOOL)titleClicked;
@end

The delegate implements one optional method. The .m file is as follows:

NavigationBar.m:

@implementation NavigationBar

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        _titleClicked = 0;
    }
    return self;
}

- (void)drawRect:(CGRect)rect
{
    self.tintColor = [UIColor colorWithRed:(111/255.f) green:(158/255.f) blue:(54/255.f) alpha:(255/255.f)];

    UIImage *image = [UIImage imageNamed:@"titlelogo.png"];

    UIButton *titleButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, image.size.width, image.size.height)];
    titleButton.backgroundColor = [UIColor colorWithPatternImage:image];
    [titleButton addTarget:self action:@selector(titleButton:) forControlEvents:UIControlEventTouchUpInside];

    //        self.navigationController.delegate = self;
    [self.topItem setTitleView:titleButton];

    [super drawRect:rect];
}

- (void)titleButton:(UIButton *)sender
{
    _titleClicked = !_titleClicked;
    [self.delegate titleButtonClicked:_titleClicked];
}

This creates a navbar with a logo and calls the titleButton method when the title button has been clicked. Everything is fine up till here and the navigation bar displays nicely.

In my RootViewController:

NavigationBar *navigationBar = [[NavigationBar alloc] initWithFrame:CGRectMake(0.0f, 0.0f, self.view.frame.size.width, 44.0f)];
navigationBar.delegate = self;
[self.navigationController setValue:navigationBar forKey:@"navigationBar"];

An implementation of titleButtonClicked is also there. When I click on the title view however, I get the following error: -[UINavigationController titleButtonClicked:]: unrecognized selector sent to instance

Why am I getting titleButtonClicked sent to UINavigationController? Is there something I need to do in my navigation controller? I am just using plain old UINavigationController. Do I need to subclass that too? If so, why?

EDIT:

Calling po self.delegate on line [self.delegate titleViewClicked:_titleClicked]; in NavigationBar.m yields the result below. How did the delegate change its type? How can I fix that?

(lldb) po self.delegate
(objc_object *) $1 = 0x07550170 <UINavigationController: 0x7550170>

解决方案

You have a clash/ambiguity between your delegate and UINavigationBar's delegate property. Rename your delegate to disambiguate them.

这篇关于代表被送到错课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！