IOS学习之NSSet和NSMutableSet测试讲解

1、nsset、nsmutableset

nsset元素无序、不能重复

nsmutableset元素无序、不能重复,有一些向集合中增加元素的功能、删除元素.......

2、测试demo

int main(int argc, char * argv[]) {
 @autoreleasepool {
  
  nsset *set = [nsset setwithobjects:@"chenyu", @"hello", @"word", @"see", nil];
  set = [set setbyaddingobject:@"chenxuan"];
  for (id object in set)
  {
nslog(@"%@", object);
  }
  nsset *set1 = [nsset setwithobjects:@"chenyu1", @"hello1", @"word", @"see", @"see", @"hello1", nil];
  //set和set1的并集
  nslog(@".......");
  nsset *s = [set setbyaddingobjectsfromset:set1];
  for (id object in s)
  {
nslog(@"%@", object);
  }
  //是否有交集
  nslog(@"set1 和 set 是否有交集:%d", [set1 intersectsset:set]);
  //set1是否是set集合的子集
  
  bool bo = [set1 containsobject:@"see"];
  nslog(@"set1 是否包含 see %d", bo);
  
  nslog(@"-------");
  nsmutableset *set2 = [nsmutableset setwithcapacity:10];
  [set2 addobject:@"chenyu"];
  [set2 addobject:@"hello"];
  [set2 addobject:@"hello"];
  [set2 addobject:@"hello"];
  [set2 addobject:@"hello1"];
  [set2 addobject:@"hello3"];
  nslog(@"-------");
  for (id object in set2)
  {
nslog(@"%@", object);
  }
  nslog(@"-------");
  [set2 removeobject:@"hello1"];
  for (id object in set2)
  {
nslog(@"%@", object);
  }
 }
}

3、运行结果

2018-07-18 23:26:20.748305+0800 cytest[33554:12766983] hello
2018-07-18 23:26:20.748415+0800 cytest[33554:12766983] chenyu1
2018-07-18 23:26:20.748554+0800 cytest[33554:12766983] word
2018-07-18 23:26:20.749114+0800 cytest[33554:12766983] set1 和 set 是否有交集:1
2018-07-18 23:26:20.749626+0800 cytest[33554:12766983] set1 是否包含 see 1
2018-07-18 23:26:20.749838+0800 cytest[33554:12766983] -------
2018-07-18 23:26:20.750052+0800 cytest[33554:12766983] -------
2018-07-18 23:26:20.773300+0800 cytest[33554:12766983] chenyu
2018-07-18 23:26:20.789523+0800 cytest[33554:12766983] hello1
2018-07-18 23:26:20.791472+0800 cytest[33554:12766983] hello3
2018-07-18 23:26:20.791896+0800 cytest[33554:12766983] hello
2018-07-18 23:26:20.797038+0800 cytest[33554:12766983] -------
2018-07-18 23:26:20.800879+0800 cytest[33554:12766983] chenyu
2018-07-18 23:26:20.804327+0800 cytest[33554:12766983] hello3
2018-07-18 23:26:20.804808+0800 cytest[33554:12766983] hello