Cocoa：NSApp beginSheet设置应用程序委托？ [英] Cocoa: NSApp beginSheet sets the application delegate?

问题描述

我想在我的应用程序中显示自定义工作表，但我认为我做错了。虽然一切似乎工作很好，我有一个奇怪的副作用。 （需要几个小时才弄清楚）。事实证明，每次我在我的应用程序中显示一个工作表，应用程序委托被设置为工作表的实例，因此我的控制器会被取消设置作为委托，导致各种问题。

I am trying to display a custom sheet in my application, but I think I am doing something wrong. While everything seems to be working just fine, I have a rather odd side-effect. (which took hours to figure out). It turns out that everytime I display a sheet in my application, the Application delegate gets set to the instance of the sheet, thus my Controller gets unset as the delegate causing all sorts of problems.

我创建了一个NIB文件，我称之为FailureSheet.xib。我在IB中布局了我的接口，然后创建了一个'NSWindowController'的子类，名为'FailureSheet.m'，我设置为文件的所有者。这是我的FailureSheet类：

I've created a NIB file which I called FailureSheet.xib. I laid out my interface in IB, and then created a subclass of 'NSWindowController' called 'FailureSheet.m' which I set to the File's Owner. Here is my FailureSheet class:

#import "FailureSheet.h"

@implementation FailureSheet  // extends NSWindowController

- (id)init
{
    if (self = [super initWithWindowNibName:@"FailureSheet" owner:self])
    {

    }
    return self;
}

- (void)dealloc
{
    [super dealloc];
}

- (IBAction)closeSheetTryAgain:(id)sender
{   
    [NSApp endSheet:[self window] returnCode:1];
    [[self window] orderOut:nil];
}

- (IBAction)closeSheetCancel:(id)sender
{
    [NSApp endSheet:[self window] returnCode:0];
    [[self window] orderOut:nil];
}

- (IBAction)closeSheetCancelAll:(id)sender
{
    [NSApp endSheet:[self window] returnCode:-1];
    [[self window] orderOut:nil];
}

@end

现在这是我在我的Controller类中显示FailureSheet的方法：

Nothing complex going on here. Now this is how I display the FailureSheet in my 'Controller' class:

sheet = [[FailureSheet alloc] init];

[NSApp beginSheet:[sheet window]
   modalForWindow:window
    modalDelegate:self
   didEndSelector:@selector(failureSheetDidEnd:etc:etc:)
      contextInfo:nil];

现在，如果我在显示我的表单之前记录[NSApp委托]是什么， -0x012345>哪个是对的。然后，运行此代码和我的工作表后，如果我再次记录它是< FailureSheet-0xABCDEF>。

Now if I log what the [NSApp delegate] is before displaying my sheet, it is <Controller-0x012345> which is correct. Then, after running this code and my sheet is up, if I log it again it is <FailureSheet-0xABCDEF>.

不知道我在做什么错误- 有任何想法吗？

Not sure what I'm doing wrong here - Any ideas?

推荐答案

这是其中一个I'm-an-idiot的答案。

This is one of those "I'm-an-idiot" answers.

结果我在某个时候，我不小心在应用程序和文件的所有者（FailureSheet）之间的工作表的NIB文件中设置它作为委托的连接。所以，每次它加载它覆盖了现有的委托连接我在MainMenu NIB文件。

Turns out I at some point I accidentally made a connection in my sheet's NIB file between the Application and the File's Owner (FailureSheet) setting it as the delegate. So, everytime it got loaded it overwrote the existing delegate connection I had in my MainMenu NIB file.

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