Re: Communications between multiple NIB's
Re: Communications between multiple NIB's
- Subject: Re: Communications between multiple NIB's
- From: Steve Weller <email@hidden>
- Date: Mon, 24 Mar 2008 17:58:51 -0700
On Mar 24, 2008, at 3:27 PM, Gerd Knops wrote:
Is there a way to programmatically connect to a NIB file and read
it's
outlets without changing my File's Owner? I have a color well in one
NIB (My Prefs NIB) and a window in another. I want the color well to
change the window's background. I have an action called setColor:,
but
I cannot figure out how to access the window outlet from the NIB
containing the window. Please help!
I use a different approach -- it may not be the "right" one, but it
works for me. In my case I have a gray slider in a prefs panel. In IB
I bind that to Shared User Defaults and provide Controller Key
"values" and Model Key Path "browserBackgroundGray". That deals with
everything except updating the browser view.
In the prefs pane window controller I do this:
- (IBAction)browserBackgroundGrayAction:(id)sender;
{
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center postNotificationName:@"browserBackgroundColorChanged"
object:self];
}
In the browser view controller I do this:
// Observe changes in browser background color
-(void)startObservingChanges;
{
// Register to observe notifications of background color changes
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center addObserver:self
selector:@selector(browserBackgroundColorChange:)
name:@"browserBackgroundColorChanged" object:nil];
}
-(void)stopObservingChanges;
{
//
NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
[center removeObserver:self];
}
These are called by appropriate methods that the window controller
makes.
I implement the color change like this:
// Handle browser background color notification
-(void)browserBackgroundColorChange:(NSNotification*)note;
{
float grayValue;
NSColor *color;
grayValue = [[NSUserDefaults standardUserDefaults]
floatForKey:@"browserBackgroundGray"];
color = [NSColor colorWithCalibratedRed:grayValue green:grayValue
blue:grayValue alpha:1.0];
[browserView setValue:color forKey:IKImageBrowserBackgroundColorKey];
[browserView setNeedsDisplay:YES];
}
In my multiple document application this changes the background of the
browser in all documents at once.
Given you are talking preferences, you probably do not want a direct
connection at all but rather use the user defaults system as middle
man, which has the additional benefit that it will save the color
for you:
In IB select the Bindings info for your color well, and bind the
value as follows:
Bind to: Shared Defaults
Model Key Path: myWindowBackgroundColor (or whatever)
Value Transformer: NSUnachiveFromData
Now somewhere in your application you probably want to set an
initial default, like so:
+ (void)initialize {
//
// Register initial defaults
//
NSMutableDictionary *defaults=[NSMutableDictionary dictionary];
[defaults setObject:[NSArchiver archivedDataWithRootObject:[NSColor
windowBackgroundColor]] forKey:@"myWindowBackgroundColor"];
// Set other initial defaults here
[[NSUserDefaults standardUserDefaults]registerDefaults:defaults];
}
Now in your window or window controller class you want to get
notified when that color is changed. So somewhere in -init or -
awakeFromNib add this:
[[NSUserDefaultsController
sharedUserDefaultsController]addObserver:self
forKeyPath:@"values.myWindowBackgroundColor"
options:0
context:nil];
In the same class you need to implement an observer method like so:
- (void)observeValueForKeyPath:(NSString*)keyPath
ofObject:(id)object
change:(NSDictionary*)change
context:(void*)context
{
if([keyPath isEqualToString:@"values.myWindowBackgroundColor"])
{
[self setBackgroundColorFromDefaults];
}
}
And finally the method that sets the color:
- (void)setBackgroundColorFromDefaults {
NSUserDefaults *ud=[NSUserDefaults standardUserDefaults];
NSColor *bgColor=[NSUnarchiver unarchiveObjectWithData:[ud
dataForKey:@"myWindowBackgroundColor"]];
[self setColor:bgColor];
}
As last step you should probably call setBackgroundColorFromDefaults
somewhere early in your code so that your window start out with the
right color.
Alternatively don't set the color at all, but have the observer
trigger a redraw, and in the drawing code read the color from the
defaults.
Hope that helps!
Gerd
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