Objective-C 集合

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#import <Foundation/Foundation.h>

int main(int argc,const char * argv[])

{

@autoreleasepool {

// insert code here...

//集合

//类方法创建集合

NSSet *set1 = [NSSetsetWithObjects:@"1",@"2",nil];

//实例方法创建集合

NSSet *set2 = [[NSSetalloc]initWithObjects:@"3",@"4",@"2",nil];

//通过数组创建集合

NSArray *array1 = [NSArrayarrayWithObjects:@"7",@"10" ,nil];

//通过已有数组创建集合

NSSet *set3 = [NSSetsetWithArray:array1];

//通过已有集合创建集合

NSSet *set4 =[NSSetsetWithSet:set1];

NSLog(@"set1 : %@",set1);

NSLog(@"set2 : %@",set2);

NSLog(@"set3 : %@",set3);

NSLog(@"set4 : %@",set4);

//集合的常用方法

//集合中对象的个数

int count = [set2 count];

NSLog(@"set2 :%d",count);

//以数组形式返回集合中所有对象

NSArray *objects = [set1 allObjects];

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

//将集合3中任意一个对象

id object = [set3 anyObject];

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

//是否包含摸个元素

BOOL isContain = [set4 containsObject:@"1"];

NSLog(@"isContain :%d",isContain);

//集合间是否存在交集

BOOL isInsersect = [set1 intersectsSet:set2];

NSLog(@"isInsersect:%d",isInsersect);

//集合是否有匹配(集合间的各个元素都相同)

BOOL isEqual = [set1 isEqual:set2];

NSLog(@"isEqual:%d",isEqual);

//集合是否是另一个集合的子集

BOOL isSub = [set1 isSubsetOfSet:set2];

NSLog(@"isSub:%d",isSub);

//为集合追加元素

NSSet *set5 = [NSSetsetWithObjects:@"one",nil];

NSSet *appSet1 = [set5 setByAddingObject:@"two"];

NSLog(@"appSet1:%@",appSet1);

//用已有集合给新集合追加

NSSet *appSet2 = [appSet1 setByAddingObjectsFromSet:set3];

NSLog(@"appSet2:%@",appSet2);

//把已有数组追加给集合

NSArray *array2 = [NSArrayarrayWithObject:@"end"];

NSSet *appSet3 = [set5 setByAddingObjectsFromArray:array2];

NSLog(@"appSet3:%@",appSet3);

//可变集合

//创建一个空集合

NSMutableSet *set6 = [NSMutableSetsetWithObjects:@"1",@"2",@"a",nil];

NSMutableSet *set7 = [NSMutableSetsetWithObjects:@"1",@"3",@"a",nil];

//集合相减

[set6 minusSet:set7];

NSLog(@"set6:%@",set6);

//集合之间交集

[set6 intersectsSet:set7];

NSLog(@"set6:%@",set6);

//集合之间并集

[set6 unionSet:set7];

NSLog(@"set6:%@",set6);

//指定集合一个对象删除

[set6 removeObject:@"2"];

NSLog(@"set6:%@",set6);

}

return 0;

}

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