NSWindowController：loadWindow从nib加载窗口，但showWindow：什么也不做 [英] NSWindowController: loadWindow loads window from nib but showWindow: does nothing

问题描述

我有一个名为 _PreferencesWindowController 的NSWindowController子类，具有以下实现 -

  @synthesize window; 
 
  - （id）init {
 
 self = [super initWithWindowNibName：@PreferencesWindow]; 
 if（！self）return nil; 
 
 return self; 
} 
  

我试图在 _PreferencesWindowController 使用以下代码 -

  _preferencesWindowController = [[_PreferencesWindowController alloc] init]; 
 [_preferencesWindowController showWindow：nil]; 
  

它什么也不做，我检查了 _preferencesWindowController.window loadView ，则调试器会调用 nil 。

< c $ c> on _preferencesWindowController 窗口可以加载并可见; _preferencesWindowController.window 不再为零值 -

  [_ preferencesWindowController loadWindow ]; 
 

我看过苹果关于NSWindowController的文档，它特别说你不应该直接调用 loadWindow ，而应使用 showWindow：。

解决方案

OK我解决了这个问题这是通过查看 NSWindowController 头文件。

问题出在我的头文件_PreferencesWindowController -

  @interface _PreferencesWindowController：NSWindowController< NSToolbarDelegate> {
 
 NSWindow * window; 
 
} 
 
 @property（assign）IBOutlet NSWindow * window; 
 
 @end 
  

通过删除@property声明并更改 NSWindow * window ivar至 IBOutlet NSWindow * window ， showWindow：

属性声明必须在 showWindow：方法中导致未定义的行为 NSWindowController 的实现。

I have an NSWindowController subclass called _PreferencesWindowController with the following implementation -

@synthesize window;

- (id)init {

 self = [super initWithWindowNibName:@"PreferencesWindow"];
 if (!self) return nil;

 return self;
}

And I tried to show the window in _PreferencesWindowController by using the following code -

_preferencesWindowController = [[_PreferencesWindowController alloc] init];
[_preferencesWindowController showWindow:nil];

It does nothing, and I checked _preferencesWindowController.window is nil from the debugger.

However if I call loadView on _preferencesWindowController the window can be loaded and is visible; _preferencesWindowController.window is no longer nil-valued -

[_preferencesWindowController loadWindow];

I looked at Apple's documentation on NSWindowController it specifically says "you should never directly invoke loadWindow", instead showWindow: should be used. I'm wondering what I might have missed that resulted in the above-mentioned behaviour I have been seeing.

解决方案

OK I solved this by looking at the NSWindowController header file.

The problem is in my header file for _PreferencesWindowController -

@interface _PreferencesWindowController : NSWindowController <NSToolbarDelegate> {

    NSWindow *window;

}

@property (assign) IBOutlet NSWindow *window;

@end

By removing the @property declaration and changing NSWindow *window ivar to IBOutlet NSWindow *window, showWindow: method now works without a glitch.

The property declaration must have resulted in an undefined behaviour in showWindow: method in NSWindowController's implementation.

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