为什么不从我的NSFontPanel调用changeFont :？

问题描述

限时删除！！

我正在创建 NSFontPanel ，但是选择字体不会调用 changeFont：方法。

我在 NSWindowController 子类中定义了以下方法：

 -（IBAction）showFontPanel：{id）sender {
 [[NSFontPanel sharedFontPanel] makeKeyAndOrderFront：self]; 
 NSUserDefaults * prefs = [NSUserDefaults standardUserDefaults]; 
 NSFont * theFont = [NSFont fontWithName：[prefs stringForKey：iepFontName] size：[prefs floatForKey：iepFontSize]]; 
 [[NSFontPanel sharedFontPanel] setPanelFont：theFont isMultiple：NO]; 
 
 [[NSFontManager sharedFontManager] setDelegate：self]; 
} 
 
-（void）changeFont：（id）sender {
 NSLog（@ changeFont）; 
} 
 
-（NSUInteger）validModesForFontPanel：（NSFontPanel *）fontPanel {
 return NSFontPanelFaceModeMask | NSFontPanelSizeModeMask | NSFontPanelCollectionModeMask; 
} 
  

字体面板显示正确的字体和大小，并且仅启用模式在 validModesForFontPanel：中，但是当我选择其他字体时，不会调用 changeFont：方法。我的理解是 changeFont：操作消息是在响应者链上发送的。作为测试，我在应用程序委托中放置了相同的 changeFont：方法（该方法应该在响应者链中），但没有被调用。我在某个地方错过了一步吗？

解决方案

我找到了答案（）。我添加了这一行：

  [[NSFontManager sharedFontManager] setAction：@selector（changeDefaultFont :)]; 
  

，并在我的 NSWindowController 子类。现在，当我在字体面板中选择其他字体时，会调用 changeDefaultFont：。

I'm creating an NSFontPanel but selecting a font doesn't call the changeFont: method.

I have these methods defined in an NSWindowController subclass:

- (IBAction)showFontPanel:(id)sender {
    [[NSFontPanel sharedFontPanel] makeKeyAndOrderFront:self];
    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
    NSFont *theFont = [NSFont fontWithName:[prefs stringForKey:iepFontName] size:[prefs floatForKey:iepFontSize]];
    [[NSFontPanel sharedFontPanel] setPanelFont:theFont isMultiple:NO];

    [[NSFontManager sharedFontManager] setDelegate:self];
}

- (void)changeFont:(id)sender {
    NSLog(@"changeFont");
}

- (NSUInteger)validModesForFontPanel:(NSFontPanel *)fontPanel {
    return NSFontPanelFaceModeMask |  NSFontPanelSizeModeMask | NSFontPanelCollectionModeMask;
}

The font panel appears with the correct font and size selected and only the modes enabled in validModesForFontPanel:, but when I select a different font, the changeFont: method doesn't get called. My understanding is that the changeFont: action message gets sent up the responder chain. As a test, I put an identical changeFont: method in my application delegate (which is supposed to be in the responder chain) but it isn't getting called either. Am I missing a step somewhere?

解决方案

I found an answer (http://www.cocoabuilder.com/archive/cocoa/108016-nsfontpanel-act-on-it-own-accessory-view.html#108136). I added this line:

[[NSFontManager sharedFontManager] setAction:@selector(changeDefaultFont:)];

and made the corresponding change to the method name in my NSWindowController subclass. Now when I select a different font in the font panel, changeDefaultFont: gets called.

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