KVO与KVC整理资料

KVC/KVO

第wangzz 第http://blog.csdn.net/wzzvictory/article/details/9674431 到⽣生增⼿手wangzzstrive 增等

第 1你KVC/KVO增看真以 ⾏行 2KVO增对KVC增KVC ⾏行

KVC/KVO中种开就增Cocoa微NSObject NSKeyValueCoding/NSKeyValueObserving就样就 ⾏行样增KVC/KVO 主⾏行 增KVC/KVOObjective-C⼤大runtime增 只⾏行 ⼼心增KVC/KVO⽽而家增学⾏行

1KVC
Key-value coding增全之得⾏行增时map 

经活⾏行⼒力觉⽽而家⽽而两
⾏行

2KVO
Key-value observing增全之得中种⾏行

还的⾏行MVCCocoa增KVO

⾃自modelcontroller⾏行

KVC

1KeyKey Path

KVC⽽而增⽽而第 [java] view plaincopy

1. #$(id)valueForKey:(NSString$*)key;$$
2. #$(void)setValue:(id)value$forKey:(NSString$*)key;$$
3. #$(id)valueForKeyPath:(NSString$*)keyPath;$$
4. #$(void)setValue:(id)value$forKeyPath:(NSString$*)keyPath;$$

Key增⽽而⼒力觉⾏行 KeyPath给⼒力动⽽而在 ⼒力觉情⾏行KeyPath address.street⽽而是⽆无 address⽆无street⾏行KeyPath 给⽽而时⼈人⼒力觉⾏行

2KVC

⽽而家增来KVC⽽而增 ⾏行⽽而增来增KVC ⾏行明第KVC⽽而得⾏行 3To-Many 明To-One,Person name增⾏行增Person friendsName增⼦子明Objective-CNSArray增NSSet 增说⾏行 给增第

给

有KVC⼦子增⼦子给⼦子⾏行

给 

开发增后⼀一就

⽽而⼦子不⾏行

情⼦子第

[java] view plaincopy

  1. #countOf<Key>$$

  2. //NSArraycount:$$

  3. #objectIn<Key>AtIndex:$$

  4. #<key>AtIndexes:$$

  5. //$NSArray$

    $objectAtIndex:$$objectsAtIndexes:$$

  6. #get<Key>:range:$$

  7. //$NSArray$ $getObjects:range:$$

  8. $$

  9. #insertObject:in<Key>AtIndex:$$

  10. #insert<Key>:atIndexes:$$

  11. //$NSMutableArray$

    $insertObject:atIndex:$$insertObjects:atIndexes:$$

  12. #removeObjectFrom<Key>AtIndex:$$

  13. #remove<Key>AtIndexes:$$

  14. //$NSMutableArray$

    $removeObjectAtIndex:$$removeObjectsAtIndexes:$$

  15. #replaceObjectIn<Key>AtIndex:withObject:$$

  16. #replace<Key>AtIndexes:with<Key>:$$

  17. //$$

情⼦子第

[java] view plaincopy

  1. #countOf<Key>$$

  2. //NSArraycount:$$

  3. #objectIn<Key>AtIndex:$$

  4. #<key>AtIndexes:$$

  5. //$NSArray$

    $objectAtIndex:$$objectsAtIndexes:$$

  6. #get<Key>:range:$$

  1. //$NSArray$ $getObjects:range:$$

  2. $$

  3. #insertObject:in<Key>AtIndex:$$

  4. #insert<Key>:atIndexes:$$

  5. //$NSMutableArray$

    $insertObject:atIndex:$$insertObjects:atIndexes:$$

  6. #removeObjectFrom<Key>AtIndex:$$

  7. #remove<Key>AtIndexes:$$

  8. //$NSMutableArray$

    $removeObjectAtIndex:$$removeObjectsAtIndexes:$$

  9. #replaceObjectIn<Key>AtIndex:withObject:$$

  10. #replace<Key>AtIndexes:with<Key>:$$

  11. //$$

增增 ⽤用都增⾏行得在增友 个就样就增在我⾏行 4Key-Value Validation KVC们KeyValue第

[java] view plaincopy
1. #$(BOOL)validateValue:(inout$id$*)ioValue$forKey: 

     (NSString$*)inKey$error:(out$NSError$**)outError;$$

很⼀一就第

[java] view plaincopy
1. #$(BOOL)validate<Key>:error:$$

name第 [java] view plaincopy

  1. #(BOOL)validateName:(id$*)ioValue$error: (NSError$*$__autoreleasing$*)outError${$$

  2. $$$$//$Implementation$specific$code.$$

  3. $$$$return$...;$$

  4. }$$ 

然⾏行

在增KVC之得们增们

⾏行真以增CoreData⾏行

5KVC

得如着增次⾏行

KVC⾏行KVC得如

着NSNumberNSValue增⾃自不⾏行

两增PersonNSIntegerage

还的得

KVC真以就想age得第 [java] view plaincopy

1. [person$setValue:[NSNumber$numberWithInteger:5]$forKey:@"age"];$$

ageNSNumber增KVCNSNumber也 NSInteger增⽽而家想age得⾏行

得 增就age得第

[java] view plaincopy
1. [person$valueForKey:@"age"];$$

增NSNumber就age得⾏行

增NSNumber增NSValue意

间NSNumber

NSNumber着第 [java] view plaincopy

  1. +$(NSNumber$*)numberWithChar:(char)value;$$

  2. +$(NSNumber$*)numberWithUnsignedChar:(unsigned$char)value;$$

  3. +$(NSNumber$*)numberWithShort:(short)value;$$

  4. +$(NSNumber$*)numberWithUnsignedShort:(unsigned$short)value;$$

  5. +$(NSNumber$*)numberWithInt:(int)value;$$

  6. +$(NSNumber$*)numberWithUnsignedInt:(unsigned$int)value;$$

  7. +$(NSNumber$*)numberWithLong:(long)value;$$

  8. +$(NSNumber$*)numberWithUnsignedLong:(unsigned$long)value;$$

  9. +$(NSNumber$*)numberWithLongLong:(long$long)value;$$

  10. +$(NSNumber$*)numberWithUnsignedLongLong:(unsigned$long$long)value;$$

  11. +$(NSNumber$*)numberWithFloat:(float)value;$$

  12. +$(NSNumber$*)numberWithDouble:(double)value;$$

  13. +$(NSNumber$*)numberWithBool:(BOOL)value;$$

  14. +$(NSNumber$*)numberWithInteger: 

         (NSInteger)value$NS_AVAILABLE(10_5,$2_0);$$

  15. +$(NSNumber$*)numberWithUnsignedInteger:

         (NSUInteger)value$NS_AVAILABLE(10_5,$2_0);$$

得着⾏行 NSValue

NSValue如着增⼦子如第 [java] view plaincopy

  1. +$(NSValue$*)valueWithCGPoint:(CGPoint)point;$$

  2. +$(NSValue$*)valueWithCGSize:(CGSize)size;$$

  3. +$(NSValue$*)valueWithCGRect:(CGRect)rect;$$

  4. +$(NSValue$*)valueWithCGAffineTransform:

         (CGAffineTransform)transform;$$

  5. +$(NSValue$*)valueWithUIEdgeInsets:(UIEdgeInsets)insets;$$

  6. +$(NSValue$*)valueWithUIOffset:

         (UIOffset)insets$NS_AVAILABLE_IOS(5_0);$$

6等如会意增如 NSValue增了去第 http://blog.csdn.net/wzzvictory/article/details/8614433 6Collection Operators

⼦子⼒力被Key Path增了果valueForKeyPath第 增增valueForKey:情话⽅方⾏行 ⼒力@被⼒力觉增⼀一就要第

么⼦子⼒力

么⼦子⼒力@avg增@count增@max增@min增@sum5增要

增不⾏行

⼦子第transactions增说Transaction

两增第payee增amount增date⾏行两

⼒力第

amount什得第 [java] view plaincopy

1. NSNumber$*transactionAverage$=$[transactions$valueForKeyPath:@"@avg .amount"];$$

transactions⼦子不第 [java] view plaincopy

1. NSNumber$*numberOfTransactions$=$[transactions$valueForKeyPath:@"@c ount"];$$

增@count⼦子⼒力被增

增⾏行

⼒力

⼦子⼒力能点增和就在增第

[java] view plaincopy
1. @distinctUnionOfObjects$$

2. @unionOfObjects$$ 得NSArray增新三增 

⽂文⼦子⾏行
第

[java] view plaincopy

1. NSArray$*payees$=$[transactions$valueForKeyPath:@"@distinctUnionOfO bjects.payee"];$$

2. NSArray$*payees$=$[transactions$valueForKeyPath:@"@unionOfObjects.p ayee"];$$

好机能增好机 ⾏行
间ArraySet给⼒力 能点增⼦子⽆无⼦子增现上 第

[java] view plaincopy

1. //$Create$the$array$that$contains$additional$arrays.$$ 2. self.arrayOfTransactionsArray$=$[NSMutableArray$array];$$ 3. $$$
4. //$Add$the$array$of$objects$used$in$the$above$examples.$$ 5. [arrayOfTransactionsArray$addObject:transactions];$$
6. $$$

  1. //$Add$a$second$array$of$objects;$this$array$contains$alternate$val ues.$$

  2. [arrayOfTransactionsArrays$addObject:moreTransactions];$$

⽆无⼦子⼦子第arrayOfTransactionsArray 给arrayOfTransactionsArray⽆无⼦子增

⼒力第

[java] view plaincopy

1. @distinctUnionOfArrays$$ 2. @unionOfArrays$$
3. @distinctUnionOfSets$$

⼦子Arrays增⼦子Sets⾏行Sets 三增@unionOfSets⼒力⾏行

两第

[java] view plaincopy
1. NSArray$*payees$=$[arrayOfTransactionsArrays$valueForKeyPath:@"@uni

onOfArrays.payee"];$$

1KVC KVC时⽽而家⾏行⽽而家 增增KVC为⽽而家到⽣生⾏行想 增KVC出情真以第 做这说-<key>-is<key>明得-get<key>⽽而 家增增得⽂文 做这说-set<key>:增想得⾏行-get<key>- set<key>:增⼈人Key⼒力觉增Cocoa 吧⽂文 只增做这-_<key>-_is<key>明得 -_get<key>-_set<key>:⽂文 间⽽而家增⽽而两⾏行两 第<key>_<key>; 增valueForUndefinedKey:setValue:forUndefinedKey: ⾏行很增着⼈人⾏行 2KVC/KVO 之得之得中种着isa-swizzling真以增着runtime ⼤大⾏行上成去第 http://blog.csdn.net/kesalin/article/details/8194240 时中种增⼤大知 增知⼈人中种 setter ⾏行 知⼈人 setter 增之得中 种⾏行想 setter 增⼈人 KVO ⾏行主每 KVO 想就 得增那还的增 KVO ⾏行 知⼈人 class “更”地⾏行 isa 在在才知增

知增 setter ⼈人 setter增 没之得⾏行增知⼈人 dealloc 学看微⾏行 ⼈人增学两增⾏行 去Objective-C第 http://blog.csdn.net/wzzvictory/article/details/8592492 增isa在在增第Person增 runtime的第NSKVONotifying_Person⾏行 NSKVONotifying_Person⼈人第 set增class增dealloc增_isKVOA⾏行

class

⼈人class⼈人下⾏行

道第

[java] view plaincopy
1. NSLog(@"self#>isa:%@",self#>isa);$$

2. NSLog(@"self$class:%@",[self$class]);$$ KVO增道第

[java] view plaincopy
1. self#>isa:Person$$

2. self$class:Person$$ KVO增道第

[java] view plaincopy
1. self#>isa:NSKVONotifying_Person$$

2. self$class:Person$$ isa在class新增⾏行

⼈人set ⼈人set增set⼼心第

[java] view plaincopy
1. #$(void)willChangeValueForKey:(NSString$*)key$$

2. #$(void)didChangeValueForKey:(NSString$*)key$$ 增didChangeValueForKey:美第

[java] view plaincopy

1. #$(void)observeValueForKeyPath:(NSString$*)keyPath$$ 2. $$$$$$$$$$$$$$$$$$$$$$ofObject:(id)object$$
3. $$$$$$$$$$$$$$$$$$$$$$$$change:(NSDictionary$*)change$$ 4. $$$$$$$$$$$$$$$$$$$$$$$context:(void$*)context$$

增KVO等 ⽽而家增-setValue:forKey第

[java] view plaincopy
1. #$(void)willChangeValueForKey:(NSString$*)key$$

2. #$(void)didChangeValueForKey:(NSString$*)key$$ 之得对⾃自⽽而增

起要只增KVO等 增KVO第 1)KVC

KVC增⽽而家增⽽而家will/ didChangeValueForKey:⽂文 ⽽而家增setValue:forKeywill/ didChangeValueForKey:⾏行

2)⽽而家 ⼈人⽽而家will/didChangeValueForKey:⾏行 增⽽而家的得增KVO⾏行 3)起要will/didChangeValueForKey:⾏行 增KVO增will/didChangeValueForKey:⾏行 间_isKVOA
回可要 KVO ⾏行
1
么
两增
分来 活增AppleScript分来增过⾏行 2
KVC起增KVO增了去第 http://www.mikeash.com/pyblog/key-value-observing-done-right.html KVO增selectorblock增 让⼈人-addObserver:forKeyPath:options:context:成⾏行 增MAKVONotificationCenter增 github:
https://github.com/mikeash/MAKVONotificationCenter KVO多增信⾏行

了第

http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/ KeyValueCoding/Articles/KeyValueCoding.html#//apple_ref/doc/uid/ 10000107-SW1
http://blog.csdn.net/kesalin/article/details/8194240 

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原文地址：https://www.cnblogs.com/fengwuqingyang/p/4941578.html