1、NSSet、NSMutableSet

NSSet元素無序、不能重復

NSMutableSet元素無序、不能重復,有一些向集合中增加元素的功能、刪除元素.......

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2、測試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);}} }

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3、運行結果

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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總結

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