本文主要是介绍IOS学习笔记二十NSSet和NSMutableSet，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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
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