key-value-coding

I have a saved object (persisted) in Core Data. Lets say below are the values: //Entity: employee objectID: 1111 firstName: @"Jon" lastName: @"D" modified: @"10:45PM" Now, I do a RKManagedObjectRequestOperation *operation request. I set operation.savesToPersistentStore = NO; and start the operation. The object was downloaded and it's been modified to the following: //Entity: employee objectID: 1111 firstName: @"Jonathan" lastName: @"Doe" modified: @"10:55PM" //I have 15 other properties that are either Strings, NSDate, NSNumber, and BOOLs I believe at this time the modified object is in the

I'm building a RMI game and the client would load a file that has some keys and values which are going to be used on several different objects. It is a save game file but I can't use java.util.Properties for this (it is under the specification). I have to read the entire file and ignore commented lines and the keys that are not relevant in some classes. These properties are unique but they may be sorted in any order. My file current file looks like this: # Bio playerOrigin=Newlands playerClass=Warlock # Armor playerHelmet=empty playerUpperArmor=armor900 playerBottomArmor=armor457 playerBoots

I am initializing a NSManagedObject subclass using: - (void)setValuesForKeysWithDictionary:(NSDictionary *)keyedValues I am also knowingly giving it the undefined keys, which of course should throw an exception. So, I have implemented: - (void)setValue:(id)value forUndefinedKey:(NSString *)key If a key is undefined, I map it to the correct key. However, my implementation never gets called, instead NSManagedObject 's implementation is used, which in turn still throws an exception. Is there a behavior (or bug) that prevents setValuesForKeysWithDictionary: from using any NSManagedObject subclass

My team has decided that new files should be written in swift, and I am seeing an odd problem with using KVC in an Objective-C object to set a property on a Swift object. My Objective-C sets a property like so: [textObject setValue:0.0 forKey:@"fontSize"] My Swift object ( textObject ) has a custom setter/getter for this property. var fontSize: CGFloat? { get { return internalTextGraphic?.fontSize } set { internalTextGraphic?.fontSize = newValue } } However, if I set a breakpoint in the set , it never gets hit. I have Objective-C objects that also get this same call, and I just implement

Running this: @try { NSLog(@"1. autocapitalizationType = %d", [self.textField autocapitalizationType]); NSLog(@"2. autocapitalizationType = %@", [self.textField valueForKey:@"autocapitalizationType"]); } @catch (NSException *exception) { NSLog(@"3. %@", exception); } Outputs this: 1. autocapitalizationType = 0 3. [<UITextField 0x6c15df0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key autocapitalizationType. I was expecting: 1. autocapitalizationType = 0 2. autocapitalizationType = 0 This exception only happens with properties that are part of the

I have a Core 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 book with a certain bookID? Is it possible to be done with Key Value coding or do I have to enumerate all books and check them manually? Yes, you can use KVC for this. BOOL bookExists = [[set valueForKey:@"bookID"] containsObject:@"myBookID"]; 来源： https://stackoverflow.com/questions/7256909/does-a-core-data-nsset-contain-an-object-with-a-certain-id