objective-c set

  set 一级单值对象的集合，并且它可以是可变的，也可以是不变的。操作包括：搜索、添加、删除集合中的成员（公用于可变以集合），比较两个集合，计算两个集合的交集和并集等。

 

下面是一个集合的代码：

#import <Foundation/NSObject.h>#import <Foundation/NSSet.h>#import <Foundation/NSValue.h>#import <Foundation/NSArray.h>#import <Foundation/NSAutoreleasePool.h>#import <Foundation/NSString.h>//Create an integer object#define INTOBJ(v) [NSNumber numberWithInteger: v]//Add a print method to NSSet with the Pringing category@interface NSSet(Printing)-(void) print;@end@implementation NSSet(Printing)-(void) print{ printf("{"); for (int i = 0; i < [[self allObjects] count]; i++) { printf("%Ii ",(long) [ [[self allObjects] objectAtIndex:i] integerValue]); } //for (NSNumber *element in self) //printf("%Ii", (long) [element integerValue]); printf("}/n");}@endint main(int argc, const char *argv[]){ NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSMutableSet *set1 = [NSMutableSet setWithObjects: INTOBJ(1),INTOBJ(3),INTOBJ(5),INTOBJ(10),nil]; NSMutableSet *set2 = [NSMutableSet setWithObjects: INTOBJ(-5),INTOBJ(100),INTOBJ(3),INTOBJ(5),nil]; NSMutableSet *set3 = [NSMutableSet setWithObjects: INTOBJ(12),INTOBJ(200),INTOBJ(3),nil]; NSLog(@"set1:"); [set1 print]; NSLog(@"set2:"); [set2 print]; //Equality test if([set1 isEqualToSet: set2] == YES) NSLog(@"set1 equals set2"); else NSLog(@"set1 is not equal to set2"); //Membership test if([set1 containsObject: INTOBJ(10)] == YES) NSLog(@"set1 contains 10"); else NSLog(@"set1 does not contain 10"); if([set2 containsObject: INTOBJ(10)] == YES) NSLog(@"set2 contains 10"); else NSLog(@"set2 does not contain 10"); //add and remove objects from mutable set set1 [set1 addObject:INTOBJ(4)]; [set1 removeObject:INTOBJ(10)]; NSLog(@"set1 after adding 4 and removing 10:"); [set1 print]; //get intersection of two sets [set1 intersectSet: set2]; NSLog(@"set1 intersect set2:"); [set1 print]; //union of two sets [set1 unionSet:set3]; NSLog(@"set1 union set3:"); [set1 print]; [pool drain]; return 0;}