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NSArray 有序的 自然顺序
NSSet 无序的
NSSet 中不能存储重复的数据,可以用它来去除重复的数据
1.创建集合
1.1创建不可变集合
1 NSSet * set = [[NSSet alloc] initWithObjects:@"one",@"two",@"three", nil]; 2 NSLog(@"%@",set); 3 4 NSSet * set1 = [[NSSet alloc] initWithObjects:@"one",@"two",@"one",@"three", nil]; 5 NSLog(@"%@",set1);
1.2创建可变集合
1 NSMutableSet * muset = [[NSMutableSet alloc] initWithObjects:@"one",@"two", nil]; 2 3 NSLog(@"%@",muset);
2.获取元素个数
1 NSUInteger count = [set1 count]; 2 NSLog(@"%lu",count);
3.判断是否包含对象
1 BOOL isContain = [set1 containsObject:@"T"]; 2 if (isContain) { 3 NSLog(@"包含"); 4 } else { 5 NSLog(@"不包含"); 6 }
- (BOOL)containsObject:(ObjectType)anObject;
4.数组转换为集合
1 NSArray * arr = @[@"one",@"two",@"three",@"one"]; 2 NSSet * set2 =[NSSet setWithArray:arr]; 3 NSLog(@"set2 %@",set2);
5. 可变数组的增删
5.1 添加
1 [muset addObject:@"three"]; 2 NSLog(@"%@",muset);
5.2 删除
1 [muset removeObject:@"one"]; 2 NSLog(@"%@",muset);
删除全部
1 [muset removeAllObjects]; 2 NSLog(@"%@",muset);
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原文地址：http://www.cnblogs.com/gwkiOS/p/4931978.html
