NSSet 集合创建,获取,遍历,可变集合的删除 - iOS

NSSet 集合

NSArray 自然顺序NSSet是无序的注意:这个是最为重要的功能 NSSet 中不能够存储重复的数据,可以用它来去除重复的值 NSString * str1 = @"one"; NSString * str2 = @"two"; NSString * str3 = @"three"; NSSet * set = [[NSSet alloc] initWithObjects:str1,str2,str3,str1, nil]; NSLog(@"set %@",set); //count NSLog(@"count %ld",set.count); OOL isContains = [set containsObject:str1]; if (isContains) { NSLog(@"YES"); } else { NSLog(@"NO"); }

遍历

NSEnumerator * enumerator = [set objectEnumerator]; NSString * value; while (value = [enumerator nextObject]) { NSLog(@"value %@",value); }

NSMutableSet 可变集合

NSString * str1 = @"one"; NSString * str2 = @"two"; //1 创建一个可变集合 NSMutableSet * muSet = [[NSMutableSet alloc] init]; //2.增加值 [muSet addObject:str1]; [muSet addObject:str2]; NSLog(@"muSet %@",muSet); //3.删除 [muSet removeObject:str1]; NSLog(@"muSet %@",muSet); //4.删除所有 [muSet removeAllObjects]; NSLog(@"muSet %@",muSet); //5.遍历 NSEnumerator * en = [muSet objectEnumerator]; NSString * value; while (value = [en nextObject]) { NSLog(@"value %@",value); }

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