cocoa-bindings

I'm having trouble getting my UI to reflect external changes (made by another process) to an sqlite data store. I have a fairly standard core data based NSArrayController / table view. My app gets notified that external changes have been made to the data, at which point I do a [managedObjectContext reset]; // brute force, but data set is small The problem is, doing this clears all data from the table. The array controller's arrangedObjects is also empty. I thought a subsequent [arrayController fetch:nil]; might help, but it doesn't. Executing a fetch request on the managedObjectContext shows

This is a very newbie question, and this is something I have done many times before, but there's something I'm missing this time. In my AppDelegate.h file I declare an NSArray and set it as a property: @interface AppDelegate : NSObject { NSArray *lines; } @property(readwrite, retain) NSArray *lines; @end And then in the AppDelegate.m file in the awakeFromNib method I alloc it: lines = [[NSArray alloc] init]; Then I have a method that sets the lines array: NSString *fileContents = [NSString stringWithContentsOfFile:[NSHomeDirectory() stringByAppendingPathComponent:@"Desktop/sometextfile.txt"]

I have two windows: Window A is loaded from NIB; and Window B is created programmatically. Both windows have a NStextView: the attributedString of the textview in Window A is bound to the the property text of a model using IB ; while the attributedString of the textview in Window B is bound to text property of the model using -[NSObject bind:toObject:withKeyPath:options:] method. [textview bind:@"attributedString" toObject:obj withKeyPath:@"text" options:nil]; Here is the weird thing: the textview in Window B is indeed bound to the obj.text , but the changes in the textview is never updated to

I am new to Cocoa . I am displaying a simple Tableview populated with NSMutableArray which is bound to the NSArrayController as follows [_arrController bind:@"contentArray" toObject:self withKeyPath:@"dataArray" options:nil]; Here _arrController is the IBoutlet to my NSArrayController and dataArray is my NSmutableArray with the data. I am successful in populating the Tableview when I do the binding programatically. However I am not able to achieve the same binding through the Interface Builder. I selected ArrayController in my IB , went to binding section,and tried binding under the controller

I'm trying to develop a NSPopUpButton that will serve as a filter to some datasource, let's say a NSArrayController that fills a table. I can bind the NSArrayController from the menu to the selection keypath so the data is properly filtered, no problem with that. Tricky part is, I want the content of this NSPopUpButton to rely on an NSArrayController using bindings, but I'd like to add a "Show All" menu item, or at least some item that doesn't come from the Core Data and performs some special action other than filtering the table using bindings and core data. I'm trying to perform something

I can't find in the Docs where they explain all those fields and what they mean. Especially "Controller Key" is not clear to me. The Controller Key pop-up menu is a way to help you discover what keys the controller (typically a NSArrayController, NSObjectController or a NSTreeController) presents. The best example is the selection key of NSArrayControllers, which contains the set of selected objects. What is confusing is the NSObjectController presents a 'selection' key too, although the controller can control only a single object (therefore the selection = the object). I agree that it is not