[斯坦福大学iOS开发教程2010年秋].Lecture.4.pdf

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1、StanfordCS193pDevelopingApplicationsforiPhone4,iPodTouch,&iPadFall2010StanfordCS193pFall2010TodayMoreFoundationFrameworkNSArray,NSDictionary,NSSetEnumerationPropertyListsUserDefaultsMoreObjective-CAllocatingandInitializingobjectsMemoryManagementDemoNSDictionary/EnumerationNSNumberIntrosp

2、ectionStanfordCS193pFall2010FoundationFrameworkNSArrayOrderedcollectionofobjects.Immutable.That’sright,youcannotaddorremoveobjectstoitonceit’screated.Importantmethods:-(int)count;-(id)objectAtIndex:(int)index;-(void)makeObjectsPerformSelector:(SEL)aSelector;-(NSArray*)sortedArrayUsingSel

3、ector:(SEL)aSelector;-(id)lastObject;//returnsniliftherearenoobjectsinthearray(convenient)NSMutableArrayMutableversionofNSArray.-(void)addObject:(id)anObject;-(void)insertObject:(id)anObjectatIndex:(int)index;-(void)removeObjectAtIndex:(int)index;StanfordCS193pFall2010FoundationFramework

4、NSDictionaryHashtable.Lookupobjectsusingakeytogetavalue.Immutable.That’sright,youcannotaddorremoveobjectstoitonceit’screated.Keysareobjectswhichmustimplement-(NSUInteger)hash&-(BOOL)isEqual:(NSObject*)objKeysareusuallyNSStringobjects.Importantmethods:-(int)count;-(id)objectForKey:(id)key

5、;-(NSArray*)allKeys;-(NSArray*)allValues;NSMutableDictionaryMutableversionofNSDictionary.-(void)setObject:(id)anObjectforKey:(id)key;-(void)removeObjectForKey:(id)key;Stanford-(void)addEntriesFromDictionary:(NSDictionary*)otherDictionary;CS193pFall2010FoundationFrameworkNSSetUnorderedcol

6、lectionofobjects.Immutable.That’sright,youcannotaddorremoveobjectstoitonceit’screated.Importantmethods:-(int)count;-(BOOL)containsObject:(id)anObject;-(id)anyObject;-(void)makeObjectsPerformSelector:(SEL)aSelector;-(id)member:(id)anObject;//usesisEqual:andreturnsamatchingobject(ifany)NSM

7、utableSetMutableversionofNSSet.-(void)addObject:(id)anObject;-(void)removeObject:(id)anObject;-(void)unionSet:(NSSet*)otherSet;-(void)minusSet:(NSSet*)otherSet;StanfordCS193p-(void)intersectSet:(NSSet*)otherSet;Fall2010EnumerationLoopingthroughmembersofacollectioninaneffic