CS 696 Mobile Application DevelopmentFall Semester, 2010Doc 5 Collection ClassesSep 9, 2010Copyright ©, All rights reserved. 2010 SDSU & Roger Whitney, 5500 Campanile Drive, San Diego, CA 92182-7700 USA. OpenContent (http://www.opencontent.org/openpub/) license defines the copyright on this document.References2The Objective-C 2.0 Programming Language, http://developer.apple.com/iphone/library/documentation/Cocoa/Conceptual/ObjectiveC/Introduction/introObjectiveC.html#//apple_ref/doc/uid/TP30001163Collections Programming Topics for Core Foundation, http://developer.apple.com/library/mac/#documentation/CoreFoundation/Conceptual/CFCollections/CFCollections.htmlCollections Programming Topics Data Management: Data Types & Collections, http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Collections/Collections.html%23//apple_ref/doc/uid/10000034-BBCFIHFHFoundation Classes3Base Types and Objects4 NSNumber * example = [NSNumber numberWithInt:10]; NSLog(@"int %i", [example intValue]); NSLog(@"float %f", [example floatValue]); example = [NSNumber numberWithFloat:5.632]; NSLog(@"int %i", [example intValue]); NSLog(@"float %f", [example floatValue]);Some NSNumber Methods5 + numberWithBool: + numberWithChar: + numberWithDouble: + numberWithFloat: + numberWithInt: + numberWithInteger: + numberWithLong: + numberWithLongLong: + numberWithShort: + numberWithUnsignedChar: + numberWithUnsignedInt: + numberWithUnsignedInteger: + numberWithUnsignedLong: + numberWithUnsignedLongLong: + numberWithUnsignedShort: – boolValue – charValue – decimalValue – doubleValue – floatValue – intValue – integerValue – longLongValue – longValue – shortValue – unsignedCharValue – unsignedIntegerValue – unsignedIntValue – unsignedLongLongValue – unsignedLongValue – unsignedShortValueMutable & Immutable Collection Classes6Mutable versions are subsets of immutable versionImmutableMutableNSStringNSMutableStringNSArrayNSMutableArrayNSDictionaryNSMutableDictionaryNSIndexSetNSMutableIndexSetNSSetNSMutableSetNSCountedSetNSArray7 NSArray *sample; NSDate *aDate = [NSDate date]; NSValue *aValue = [[NSNumber alloc] initWithInt:5]; NSString *aString = @"a string"; sample = [NSArray arrayWithObjects: aDate, aValue, aString, nil]; [aValue release]; NSDate * result =[sample objectAtIndex: 0]; NSLog(@"date: %@", result); NSInteger size = [sample count];NSArray8Index starts at zeroOnly holds objectsCollections retain objects when addedEnumerating9 NSEnumerator *enumerator = [sample objectEnumerator]; id anObject; while (anObject = [enumerator nextObject]) { NSLog(@"object:%@", anObject); } //Fast enumeration for (id element in sample){ NSLog(@"object:%@", element); } NSEnumerator *reverse = [sample reverseObjectEnumerator]; for (id element in reverse){ NSLog(@"object:%@", element); }Note the pointer10 sample = [NSArray arrayWithObjects:@"a", @"b", @"c", nil]; for (NSString * element in sample){ NSLog(@"object:%@", element); }Yes you need the nil11[NSArray arrayWithObjects:@"a", @"b", @"c"]; // Runtime errorEnumerating with Blocks12NSString *findMe=@"c";[anArray enumerateObjectsUsingBlock:^(id obj, NSUInteger index, BOOL *stop){ if([obj localizedCaseInsensitiveCompare: findMe] == NSOrderedSame){NSLog(@"Object Found: %@ at index: %i",obj, index); *stop=YES;}}];From Collections Programming TopicsFiltering & Predicates13 NSArray * words = [NSArray arrayWithObjects: @"dog", @"cat", @"mat", nil]; NSPredicate *filterForA = [NSPredicate predicateWithFormat:@"SELF contains[c] 'a'"]; NSArray * containsA = [words filteredArrayUsingPredicate: filterForA]; //containsA == (cat, mat) NSValue *small = [NSNumber numberWithInt:1]; NSValue *medium = [NSNumber numberWithInt:10]; NSValue *large = [NSNumber numberWithInt:100]; NSArray * numbers = [NSArray arrayWithObjects: large, small, medium, nil]; NSPredicate *range = [NSPredicate predicateWithFormat:@"SELF > 5 AND SELF < 20"]; NSArray * result = [numbers filteredArrayUsingPredicate: range]; // result == (10)For more information see "Introduction to Predicates Programming Guide"Person & Name class for examples14@interface Person : NSObject { }@property (retain) Name* name;@property int age;+ (Person*) first: (NSString *) firstName last: (NSString *) lastName age: (int) age;@end@interface Name : NSObject { }@property (copy) NSString* first;@property (copy) NSString* last;+ (Name*) first: (NSString*) first last: (NSString*) last;Sorting with Selectors15 Person* joe = [Person first: @"Joe" last: @"Spade" age: 10]; Person* sally = [Person first: @"Sally" last: @"Adam" age: 5]; Person* shah = [Person first: @"Shah" last: @"Chen" age: 8]; NSArray* people = [NSArray arrayWithObjects:joe,sally,shah,nil]; NSArray * sorted = [people sortedArrayUsingSelector:@selector(age)];Sorting with Functions16 Person* joe = [Person first: @"Joe" last: @"Spade" age: 10]; Person* sally = [Person first: @"Sally" last: @"Adam" age: 5]; Person* shah = [Person first: @"Shah" last: @"Chen" age: 8]; NSArray* people = [NSArray arrayWithObjects:joe,sally,shah,nil]; NSArray * sorted = [people sortedArrayUsingFunction:ageSort context:NULL];NSInteger ageSort(id personA, id personB, void *context) { int ageA = [personA age]; int ageB = [personB age]; if (ageA < ageB) return NSOrderedAscending; else if (ageA > ageB) return NSOrderedDescending; else return NSOrderedSame;}Key-Value Coding17 Person* joe = [Person first: @"Joe" last: @"Spade" age: 10]; Person* sally = [Person first: @"Sally" last: @"Adam" age: 5]; Person* shah = [Person first: @"Shah" last: @"Chen" age: 8]; NSArray* people = [NSArray arrayWithObjects:joe,sally,shah,nil]; NSNumber * sum = [list valueForKeyPath:@"@sum.age"]; NSNumber * max = [list valueForKeyPath:@"@max.age"]; NSArray * firstNames = [list valueForKeyPath:@"@unionOfObjects.name.first"];NSMutableArray18 NSMutableArray * names = [NSMutableArray arrayWithCapacity:3]; [names addObject:@"Joe"]; [names addObject:@"Shah"]; [names addObject:@"Nguyen"]; NSLog(@"names:%@", names); NSArray * one = [NSArray arrayWithObject:@"Joe"]; NSArray * two = [one arrayByAddingObject:@"Shah"]; NSArray * three = [two arrayByAddingObject:@"Nguyen"]; NSLog(@"three:%@",