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[]) {

NSSet *set = [NSSet setWithObjects:@"chenyu", @"hello", @"word", @"see", nil];

        set = [set setByAddingObject:@"chenxuan"];

NSSet *set1 = [NSSet setWithObjects:@"chenyu1", @"hello1", @"word", @"see", @"see", @"hello1", nil];

NSSet *s = [set setByAddingObjectsFromSet:set1];

NSLog(@"set1 和 set 是否有交集:%d", [set1 intersectsSet:set]);

BOOL bo = [set1 containsObject:@"see"];

NSLog(@"set1 是否包含 see %d", bo);

NSMutableSet *set2 = [NSMutableSet setWithCapacity:10];

        [set2 addObject:@"chenyu"];

        [set2 addObject:@"hello"];

        [set2 addObject:@"hello"];

        [set2 addObject:@"hello"];

        [set2 addObject:@"hello1"];

        [set2 addObject:@"hello3"];

        [set2 removeObject:@"hello1"];

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