Key Value Coding is a mechanism for accessing an object’s properties indirectly, using strings to identify properties, rather than through invocation of an accessor method or accessing them directly through instance variables.
References
Questions tagged [kvc]
193 questions
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Bind each row of NSTableView to separate property of object?
I have a main NSArrayController bound to an NSTableView with each row containing an instance of MyObject. MyObject has about 30 properties, but the NSTableView only has 5 columns (to show the most important properties). When a row (or more) is…
Trygve
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2 answers
KVC and modern syntax
Did KVC pick up any of the features of objective-c literals a.k.a. 'modern objective-c'
I'm wondering because it would be really handy if there were something far shorter, and more readable than
[someObject setValue:someValue forKey:someKey];
Logicsaurus Rex
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How to call a function exist in libobjc.A.dylib?
I'm studying how KVC works and I set a symbolic breakpoint _class_getVariable which function would be called when sending setValue:forKey: message to object.
So I wrote this:
extern Ivar _class_getVariable(Class cls, const char *name, Class…
Jintao Ou
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1 answer
Accessing property in Cocoa AppDelegate (NSApplicationDelegate) from AppleScript
I have a very basic Cocoa application written in Xcode, and I'm trying to access a property of my application delegate with a simple AppleScript script:
tell application "HelloWorld"
set appDelegateProperty to property1
end tell
The information…
Jolly Roger
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0 answers
Modifying NSMutableDictionary by key path
I have a NSDictionary with nested NSDictionary/NSArray (Generated through a JSON).
I need to remove objects in multiple places according to some logic imposed on me.
For instance lets say that the dictionary has some structure like:
{
"Array1" :…
Avba
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2 answers
Swift 2.0 Dictionary KVC-Extension
I am trying to implement a dictionary extension to conform to a KVC protocol:
protocol KVCodeable {
func valueForKeyPath(keyPath: String) -> AnyObject?
}
Reason for doing so, I'd like to be able to get values from either NSManagedObjects or…
Ron
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1 answer
kvc get subview lastobject
I have a problem.
first,I have a NSArray like this:
(NSMutableArray *)currentCanMoveAndDeleteCellArray {
NSInteger count = [self.contentCollectionView numberOfItemsInSection:0];
NSMutableArray *currentCells = [NSMutableArray…
alice jick
- 11
- 1
1
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4 answers
NSView with a KVC property in Swift
I have a custom NSView class defined as:
class MyView: NSView
{
var someText: NSString
override func didChangeValueForKey(key: String)
{
println( key )
super.didChangeValueForKey( key )
}
// other stuff
}
What…
ericg
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1 answer
NSCollectionView does show nothing
I've tried to follow this guide:
Quick Start for Collection Views
using an NSImageView in the Collection View Item.
Nothing shows up, neither if i set the image with a Image Well neither if i set the array via code.
So i tried to do it…
Phoenix
- 181
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2 answers
Remove NSNull values in a KVC generated NSMutableArray
Here's a little test:
NSDictionary * test = @ { @"centers" : @[
@{ @"id":@"12345", @"favorite":@NO },
@{ @"id":@"2345", @"favorite":@NO },
…
Zaphod
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1
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2 answers
KVC without NSObject (NSPredicate)
I'm trying to use NSPredicate like so:
let namePredicate = NSPredicate(format: "(username BEGINSWITH[c] $word)")
if prefix == "@" {
if countElements(word) > 0 {
suggestionDatasource.users = (suggestionDatasource.users as…
Daniel van der Merwe
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1 answer
setValue:forKey crash with _sigtramp
The trace is like this
Application received signal SIGSEGV
Stack trace:
#0 CoreFoundation 002BCE149F ()
#1 libobjc.A.dylib 00394F8C8B objc_exception_throw()
#2 CoreFoundation …
Gary Lyn
- 1,088
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- 11
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2 answers
Key Value Coding for `description` property - Is this completely idiotic?
I am jumping into a codebase that I'm unfamiliar with to resolve a critical crash, so I'm interested in finding a quick fix for the problem below that I can patch and come back to refactor later.
There is a strong coupling between the JSON structure…
edelaney05
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1 answer
How to set ModelKeyPath in InterfaceBuilder to be the opposite of a BOOL property
I am setting few menu items to enabled and/or hidden and it’s all based on one bool property. I do the set up with bindings and use the Model Key Path field. I would like to set up the opposite bool value of that property in some cases and I am not…
Mace
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1 answer
setValuesForKeysWithDictionary on a managedObject gives compilation error in swift
I am trying a core data based app in swift, in which I am performing these steps:
Retrieve data from plist
Iterate through retrieved data
During each iteration insert a managedObject in managedObjectContext
Set values in inserted managedObject from…
Devarshi
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