在前向类中找不到属性“框架” [英] Property 'frame' cannot be found in forward class

问题描述

首先：我对可可粉的开发很陌生。我想我的问题很明显。

First: I'm very new to cocoa development. I guess my problem is something very obvious.

加载后，我需要知道WebView的大小。为此，我已经找到了答案，但是我遇到了问题。这是我代码的相关部分。

I need to know the size of my WebView after loading. For that I've found the answer already, but I have a Problem. Here's the relevant piece of my code.

应用程序委托：

    @implementation MDAppDelegate

    - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

      //set ourselves as the frame load delegate so we know when the window loads
      [self.webView setFrameLoadDelegate:self];

      // set the request variable, which works and then load the content into the webView
      [self.webView.mainFrame loadRequest:request];

    }

    - (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)webFrame
    {
      NSLog(@"webView:didFinishLoadForFrame");
      if([webFrame isEqual:[self.webView mainFrame]]) {
        // some code ...
        // and at some point I want to get the frame property of self.window
        NSRect windowFrame = self.window.frame;
      }
    }

window属性在应用程序委托：

The window property is defined in the header file of the app delegate:

    @interface MDAppDelegate : NSObject <NSApplicationDelegate>
      @property (weak) IBOutlet MDTransparentWindow *window;
      @property (weak) IBOutlet WebView *webView;
    @end

我找到了非常相似的问题。那里的解决方案是 #import< QuartzCore / QuartzCore.h> ，并在构建阶段选项卡中链接框架。我这样做了，但问题仍然存在。我也清理了我的项目（到目前为止，我仍然不十分了解清理的作用，但有时它会有所帮助）。

I found the answer to (so it would seem) a very similar problem. The solution there is to #import <QuartzCore/QuartzCore.h>and also link the framework in the Build Phases tab. I did this, but the problem remains. I also cleaned my project (as of now I still don't really know what cleaning does, but sometimes it helps) with no result.

该窗口是我自己的类 TransparentWindow 继承了 NSWindow 。当我开始在子类实现文件中编写 self.f 时，xcode会自动建议 frame 。但是，当我在 webView：didFinishLoadForFrame 方法中编写 self.window.f 时，不会发生这种情况。

The window is an instance of my own class TransparentWindow which is subclassing NSWindow. When I start writing self.f in the subclass implementation file xcode automatically suggests frame. But this is not happening when I write self.window.f in the webView:didFinishLoadForFrame method.

正如我所说，我是可可开发的新手。有什么提示，我可能错过了什么？

As I said, I'm new to cocoa development. Any hints, what I might have missed?

推荐答案

如果只对类进行前向声明，通常会收到此消息，例如

You usually get this message if you only did a forward declaration of a class, like

@class MyPhantasticClass;

编译器知道它是一个类，但是不知道任何方法。您需要包括正确的头文件。

The compiler knows that it is a class, but doesn't know any of it's methods. You need to include the right header file.

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