IOS学习笔记二十NSSet和NSMutableSet

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
  
 

文章来源: chenyu.blog.csdn.net，作者：chen.yu，版权归原作者所有，如需转载，请联系作者。

原文链接：chenyu.blog.csdn.net/article/details/81107211