Re: Accessing a property of a view via its controller doesn't work
Perhaps a more germane question might be, are you sure that the view controller
has a relationship with any window? It is not necessary, as I understand, for a
view to exist in a window. A view controller can load a view without placing it
into a window, and therefore viewWillMoveToWindow: will not be called, and I
suspect the “window” property would be set. Breakpoints are your friend.
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
> On Sep 4, 2021, at 12:06 PM, Ben Kennedy via Cocoa-dev
> wrote:
>
>
>> On Sep 4, 2021, at 10:27 AM, Gabriel Zachmann via Cocoa-dev
>> wrote:
>>
>> I access the window of a view by two different ways, in the controller and
>> in the view, resp., and in the controller, I always get a nil pointer.
>>
>> In my app, I have a subclass of NSView, MyView, declared like this:
>>
>> @interface MyView : NSView > CAAnimationDelegate>
>> {
>> NSWindow * window_;
>> ...
>> }
>> @property (readwrite) NSWindow * window_;
>
> What’s the purpose of this? NSView already has a `window` property that
> returns its parent window. Why not just use that?
>
> -ben
>
> Sent from my iPhone
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Re: Accessing a property of a view via its controller doesn't work
> I access the window of a view by two different ways, in the controller and in > the view, resp., and in the controller, I always get a nil pointer. Have you verified that the view you’re accessing in the controller is the same instance as the one that works? ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Accessing a property of a view via its controller doesn't work
> On Sep 4, 2021, at 10:27 AM, Gabriel Zachmann via Cocoa-dev
> wrote:
>
> I access the window of a view by two different ways, in the controller and
> in the view, resp., and in the controller, I always get a nil pointer.
>
> In my app, I have a subclass of NSView, MyView, declared like this:
>
> @interface MyView : NSView CAAnimationDelegate>
> {
>NSWindow * window_;
>...
> }
> @property (readwrite) NSWindow * window_;
What’s the purpose of this? NSView already has a `window` property that returns
its parent window. Why not just use that?
-ben
Sent from my iPhone
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Re: Accessing a property of a view via its controller doesn't work
I don’t know why this is happening, but I’ll often populate a variable if I
know it from another class and can’t find it from another. By that, I mean if
you know the window in the class that opens the preferences, get it and set it
in the MasterViewController.
> On Sep 4, 2021, at 12:26 PM, Gabriel Zachmann via Cocoa-dev
> wrote:
>
> I access the window of a view by two different ways, in the controller and in
> the view, resp., and in the controller, I always get a nil pointer.
>
>
> In my app, I have a subclass of NSView, MyView, declared like this:
>
> @interface MyView : NSView CAAnimationDelegate>
> {
>NSWindow * window_;
>...
> }
> @property (readwrite) NSWindow * window_;
>
>
> In one of MyView's instance methods, I save the window like this:
>
> - (void) viewWillMoveToWindow: (NSWindow *) newWindow
> {
>window_ = newWindow;
>...
>
>
> Also in MyView, I have this line to interrogate the styleMask at some point
> later during runtime:
>
>if ( [window_ styleMask] & NSWindowStyleMaskFullScreen )
>...
>
> This works fine, window_ has a proper value (as a pointer), and styleMask
> returns values as expected.
>
>
> However, I have pretty much the same line in my MasterViewController, which
> does not work.
>
>
> In the MasterViewController, I create an instance of MyView like this:
>
> - (void) viewDidLoad
> {
>[super viewDidLoad];
>myview_ = [[MyView alloc] initWithFrame: self.view.frame isPreview: NO ];
>[self.view addSubview: myview_];
>...
>
>
> Then, in MasterViewController's showPreferences:, I have this code:
>
> - (IBAction) showPreferences: (id) sender
> {
>if ( [myview_.window_ styleMask] & NSWindowStyleMaskFullScreen )
> ...
>
>
> Here, myview_.window_ is always 0.
>
>
> How could that be?
>
> Puzzled, Gabriel.
>
>
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Accessing a property of a view via its controller doesn't work
I access the window of a view by two different ways, in the controller and in
the view, resp., and in the controller, I always get a nil pointer.
In my app, I have a subclass of NSView, MyView, declared like this:
@interface MyView : NSView
{
NSWindow * window_;
...
}
@property (readwrite) NSWindow * window_;
In one of MyView's instance methods, I save the window like this:
- (void) viewWillMoveToWindow: (NSWindow *) newWindow
{
window_ = newWindow;
...
Also in MyView, I have this line to interrogate the styleMask at some point
later during runtime:
if ( [window_ styleMask] & NSWindowStyleMaskFullScreen )
...
This works fine, window_ has a proper value (as a pointer), and styleMask
returns values as expected.
However, I have pretty much the same line in my MasterViewController, which
does not work.
In the MasterViewController, I create an instance of MyView like this:
- (void) viewDidLoad
{
[super viewDidLoad];
myview_ = [[MyView alloc] initWithFrame: self.view.frame isPreview: NO ];
[self.view addSubview: myview_];
...
Then, in MasterViewController's showPreferences:, I have this code:
- (IBAction) showPreferences: (id) sender
{
if ( [myview_.window_ styleMask] & NSWindowStyleMaskFullScreen )
...
Here, myview_.window_ is always 0.
How could that be?
Puzzled, Gabriel.
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