key-value-coding

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Sort Array using Desciptors throws valueForUndefinedKey

I\'m trying to sort an NSMutableArray of YOEvento objects. YOEvento.h @interface YOEvento : NSObject { NSString *nombre; // stores the <name> tag[详细]

2023-04-11 00:11 分类：问答
Key-value observing on UIButton's State

UIButton has a state property, which appears to be KVO compliant by all accounts开发者_运维技巧 and there is no documentation to indicate otherwise.However, when I added an observer to a UIButton\'s s[详细]

2023-04-08 10:14 分类：问答
Access an object in an NSArray using a key path

I\'ve read through the KVC docs on Apple and it talks in depth about making your indexed collections accessible through key value cod开发者_JAVA技巧ing, but I can\'t find any examples of a key path be[详细]

2023-04-07 11:24 分类：问答
Does a Core Data NSSet contain an object with a certain ID?

I have a Core开发者_如何学JAVA Data object that contains an NSSet of other objects (e.g. Library object contains NSSet of Books). What\'s the best way to check if an instance of Library contains a boo[详细]

2023-04-02 00:39 分类：问答
Combine key value functions with NSExpression

Can I combine key value collection functions with NSExpression? I was using it with CoreData to get the max: of a value from my managed object classes, and it was working great.[详细]

2023-04-01 08:38 分类：问答
setValue: Not Getting Called for Textfield Before Enabled State Changes

I\'ve a radio button with 2 options each of which has an associated textfields.I want to disable the textfield of the radio button that is not selected when the selected button changes.[详细]

2023-03-28 07:57 分类：问答
Validation not automatically called except when using KVC key-value-coding access

I implemented a KVC validation method that is called by coredata, but is not being called when I call[详细]

2023-03-26 23:14 分类：问答
Helper classes/libraries to make use of KVC/KVO on iOS more practical/safe?

This question is really looking for a specific class that I know exists, but cannot find. A few weeks ago I read through an article outlining a helper class for using KVC - it let you encapsulate KVC[详细]

2023-03-23 16:44 分类：问答
Improving setValueForKeyPath robustness

I have created an extension to NSObject to allow for object properties to be set from data contained in a PLIST or dictionary.I did use setValuesForKeysWithDictionary but this only works for keys not[详细]

2023-03-19 02:34 分类：问答
Why does valueForKey: on a UITextField throws an exception for UITextInputTraits properties?

Running this: @try { NSLog(@\"1. autocapitalizationType = %d\", [self.textField autocapitalizationType]);[详细]

2023-03-17 22:25 分类：问答