NSWindowController subClass - Init被调用两次 [英] NSWindowController subClass - Init is Called twice

问题描述

im非常新的可可开发和我试图加载一个窗口。
我将解释我的问题。

im very new in cocoa development and I'm trying to load a Window. I will explain my problem.

当用户点击menuItem时，我使用以下代码加载我的窗口

When the user click the menuItem I use the following code to load my window

if ( !cadastroContasController )
{
    cadastroContasController = [[cadastroContas alloc]init];
    [cadastroContasController SetMenuItem:sender];
}
if ( ![[cadastroContasController window] isVisible] )
{
    NSLog(@"!isVisible");
    [cadastroContasController showWindow:nil];
}

我的cadastroContas类看起来像这样：

I my cadastroContas class looks like this:

@interface cadastroContas : NSWindowController 
{
    NSMenuItem *mnuCommand;
    IBOutlet NSComboBox *cmbSelecao;
    IBOutlet NSTextField *txtNome;
    IBOutlet NSTextField *txtSaldoInicial;
    IBOutlet NSTextField *txtAnotacoes;
}


- (void)windowDidBecomeKey:(NSNotification *)notification;
- (BOOL)windowShouldClose:(id)sender;
- (void)windowWillClose:(NSNotification *)notification;
- (void)SetMenuItem:(NSMenuItem*) menu;
- (NSMenuItem*) MenuItem;

@end

，实现是

@implementation cadastroContas

-(void)windowDidLoad
{
NSLog(@"windowDidLoad");
[mnuCommand setState:NSOnState];
}

-(id)init
{
    self = [super initWithWindowNibName:@"cadastroContas"];
NSLog(@"Init self=%p", self);
return self;
}
-(void)dealloc
{
NSLog(@"Dealoc=%p", self);
[super dealloc];
}

- (void)windowDidBecomeKey:(NSNotification *)notification
{
NSLog(@"windowDidBecomeKey window=%p", [self window]);
}

- (BOOL)windowShouldClose:(id)sender
{
NSLog(@"windowShouldClose Window=%p", [self window]);
NSLog(@"mnuComando=%p GetMenuItem=%p", mnuCommand, [self MenuItem] );
if ( mnuCommand )
{
    [mnuCommand setState:NSOffState];
}
return YES;
}

- (void)windowWillClose:(NSNotification *)notification
{

NSLog(@"windowWillClose  Window=%p", [self window]);
NSLog(@"mnuCommand=%p GetMenuItem=%p", mnuCommand, [self MenuItem] );   
[self dealloc];
}

- (void)SetMenuItem:(NSMenuItem*) menu
{
mnuCommand = menu;
}

- (NSMenuItem*) MenuItem
{
    return mnuCommand;
}

@end

点击菜单时，我收到两条消息Init，我不知道为什么。
例如：

When the menu was clicked, I received two messages "Init" and I don't know why. Exemple:

[2223:a0f] Init self=0x10014fe40
[2223:a0f] Init self=0x10011f5a0

第二个消息让 [cadastroContasController SetMenuItem：sender];

The second message let the "[cadastroContasController SetMenuItem:sender];" useless.

因此，我需要帮助来了解发生了什么。

So, I need help to understand whats going on..

另一件事， [[cadastroContasController窗口] 总是返回 NULL（0x0）我可以处理它（它不是null）。

Another thing, [[cadastroContasController window] is always returning NULL(0x0)!!, but inside my controller i can handle it (it isn't null).

推荐答案

这意味着你引入了两个实例， self 指针：注意两个消息之间的值不同。

This means you inited two instances, as shown by your logging of the self pointer: Notice that the value is different between the two messages.

您可以使用Allocations仪器看看什么导致每个窗口控制器被实例化。

You can use the Allocations instrument in Instruments to see what caused each window controller to be instantiated.

通常，当您在nib中创建其中一个，而在代码中创建另一个时，会发生此问题。在窗口控制器的情况下，您在代码中创建的应该是其笔尖的所有者;您不应在nib中创建另一个窗口控制器作为对象。

Usually, this problem happens when you create one of these in the nib and the other one in code. In the case of a window controller, the one you create in code should be the owner of its nib; you should not create another window controller as an object in the nib.

另一件事， [[cadastroContasController window] 总是返回 NULL（0x0） !!，但在我的控制器中我可以处理它（它不为null）。

Another thing, [[cadastroContasController window] is always returning NULL(0x0)!!, but inside my controller i can handle it (it isn't null).

窗口控制器，其窗口你设置到窗口的是一个返回非 - nil 。您未设置的窗口插口的窗口控制器是返回 nil 的窗口控制器。

The window controller whose window outlet you set to the window is the one that is returning non-nil. The window controller whose window outlet you didn't set is the one that is returning nil.

按照上面的说明，删除在nib中创建的窗口控制器之后，您应该将文件的所有者的窗口 outlet连接到窗口。

Following from what I said above, after deleting the window controller you created in the nib, you should connect your File's Owner's window outlet to the window.

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