[ios] NSSet,NSMutableSet[zhuan]

集合(set)是一组单值对象,它可以是固定的(NSSet)、也可以是可变的(NSMutableSet)。集合可以比较、计算交集、并集,可变集合还可以有查找、添加、删除。

二、常用方法

#import <Foundation/Foundation.h>

int main (int argc, char *argv[])

{

    NSAutoreleasePool*pool=[[NSAutoreleasePool alloc]init];

    //集合比较、修改

    NSSet *set1=[NSSet setWithObjects:@"s1",@"s2",@"s3",@"s4",nil];

    NSMutableSet *set2=[NSMutableSet setWithObjects:@"s1",@"s2",@"s3",@"s4",nil];

    NSLog(@"List set1");

    for (NSString *element in set1) {

        NSLog(@"%@",element);

    }

    if ([set1 isEqualToSet:set2]) {

        NSLog(@"set1 is equal to set set2");

    } else {

        NSLog(@"set1 is not equal to set set2");

    }

    if ([set1 containsObject:@"s1"]) {

        NSLog(@"set1 contains s1");

    } else {

        NSLog(@"set1 not contains s1");

    }

    [set2 addObject:@"s5"];

    [set2 removeObject:@"s3"];

    NSLog(@"List set2");

    for (NSString *element in set2) {

        NSLog(@"%@",element);

    }

    //集合交集、并集

    NSMutableSet *set3;

    set3=[NSMutableSet setWithObjects:@"s1",@"s3",@"s5",nil];

    [set3 intersectSet:set1];

    NSLog(@"135 intersectSet 1234");

    for (NSString *element in set3) {

        NSLog(@"%@",element);

    }

    set3=[NSMutableSet setWithObjects:@"s1",@"s3",@"s5",nil];

    [set3 unionSet:set1];

    NSLog(@"135 unionSet 1234");

    for (NSString *element in set3) {

        NSLog(@"%@",element);

    }

    [pool drain];

    return 0;

}

setWithObjects创建包含给定的对象列表的集合
+ (id)setWithObjects:(id)firstObj ...

isEqualToSet比较两个集合是否相等
- (BOOL)isEqualToSet:(NSSet *)otherSet

containsObject判断给定的对象是否在集合中
- (BOOL)containsObject:(id)anObject

addObject给集合添加一个对象,如果已有这个对象则不会添加
- (void)addObject:(id)object

removeObject删除集合中给定的对象
- (void)removeObject:(id)anObject

intersectSet取两个集合的交集,如果接收集合中的成员不是给定集合的成员,则从接受集合中删除这个成员。
- (void)intersectSet:(NSSet *)otherSet

unionSet取两个集合的并集,如果给定集合中的成员不是接收集合的成员,则将这个成员添加到接收集合中。
- (void)unionSet:(NSSet *)otherSet

三、NSSet的全部方法

Creating a Set
+ set
+ setWithArray:
+ setWithObject:
+ setWithObjects:
+ setWithObjects:count:
+ setWithSet:
– setByAddingObject:
– setByAddingObjectsFromSet:
– setByAddingObjectsFromArray:
Initializing a Set
– initWithArray:
– initWithObjects:
– initWithObjects:count:
– initWithSet:
– initWithSet:copyItems:
Counting Entries
– count
Accessing Set Members
– allObjects
– anyObject
– containsObject:
– filteredSetUsingPredicate:
– makeObjectsPerformSelector:
– makeObjectsPerformSelector:withObject:
– member:
– objectEnumerator
– enumerateObjectsUsingBlock:
– enumerateObjectsWithOptions:usingBlock:
– objectsPassingTest:
– objectsWithOptions:passingTest:
Comparing Sets
– isSubsetOfSet:
– intersectsSet:
– isEqualToSet:
– valueForKey:
– setValue:forKey:
Creating a Sorted Array
– sortedArrayUsingDescriptors:
Key-Value Observing
– addObserver:forKeyPath:options:context:
– removeObserver:forKeyPath:context:
– removeObserver:forKeyPath:
Describing a Set
– description
– descriptionWithLocale:

四、NSMutableSet的全部方法

Creating a Mutable Set
+ setWithCapacity:
– initWithCapacity:
Adding and Removing Entries
– addObject:
– filterUsingPredicate:
– removeObject:
– removeAllObjects
– addObjectsFromArray:
Combining and Recombining Sets
– unionSet:
– minusSet:
– intersectSet:
– setSet:

posted @ 2013-04-16 00:19  金建彤  阅读(429)  评论(0编辑  收藏  举报