Object-C—集合

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Obejct-C中包含了三种集合，分别是：数组、字典和集(set)。

    NSLog(@"string:%@",string);    

    NSArray *array = [string componentsSeparatedByString:@","];

    NSLog(@"array:%@",array);

    [string release];

    //从数组合并元素到字符串- componentsJoinedByString:

    NSArray *array = ［NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];

    NSString *string = [array componentsJoinedByString:@","];

    NSLog(@"string:%@",string);

    删除可变数组指定索引处的对象：

    [Mutablearray removeObjectAtIndex:1];    

    NSString *string = [dictionary objectForKey:@"One"];

    NSLog(@"string:%@",string);

    NSLog(@"dictionary:%@",dictionary);

    [dictionary release];

    创建可变字典：

    //创建

    NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];

    //添加字典

    [dictionary setObject:@"One" forKey:@"1"];

    [dictionary setObject:@"Two" forKey:@"2"];

    [dictionary setObject:@"Three" forKey:@"3"];

    [dictionary setObject:@"Four" forKey:@"4"];

    NSLog(@"dictionary:%@",dictionary);

    //删除指定的字典

    [dictionary removeObjectForKey:@"3"];

    NSLog(@"dictionary:%@",dictionary);

•     集合NSSet

    //NSSet中不能存在重复的对象

    NSMutableSet *set1 = [[NSMutableSet alloc] initWithObjects:@"1",@"2",@"3", nil]; 

   NSMutableSet *set2 = [[NSMutableSet alloc] initWithObjects:@"1",@"5",@"6", nil]; 

    [set1 unionSet:set2];   //取并集1，2，3，5，6

    [set1 intersectSet:set2];  //取交集1

    [set1 minusSet:set2];    //取差集2，3，5，6

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Object-C—集合

标签：http   io   数据   for   ar   cti   div   log   

原文地址：http://www.cnblogs.com/langtianya/p/3913793.html