集合 - 1

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Cocoa 中的集合有NSArray(NSMutableArray), NSSet (NSMutableSet, NSCountedSet), NSDictionary (NSMutableDictionary)

NSArray

-(unsigned) count

-(id) objectAtIndex:(unsigned) index

-(BOOL) containsObject:(id) anObject

NSMutableArray

-(void) addObject:(id) anObject

-(void) insertObject:(id) anObject atIndex:(unsigned) index

-(void) removeObjectAtIndex:(unsigned) index

-(void) removeObject:(id) object

NSDictionary

-(unsigned) count

-(id) objectForKey:(id) aKey

-(NSArray *) allKeys

NSMutableDictionary

-(void) setObject:(id) anObject forKey:(id) aKey

-(void) removeObjectForKey:(id) aKey

//操作plist

-(id) initWithContentsOfFile:(NSString *) aPath

-(BOOL) writeToFile:(NSString *) path atomically:(BOOL) flag

获取地址簿记录 (加入AddressBook 框架)

#import <AddressBook/AddressBook.h>

ABAddressBook * book = [ABAddressBook sharedAddressBook];

NSArray *people = [book people];

NSString *firstName = [people valueForProperty:@"First"];

NSString *lastName = [people valueForProperty:@"Last"];