@interface ViewControl ()

/** 滚动显示 */

@property (nonatomic, strong) NSScrollView *scrollView;

@end

@implementation ViewControl

#pragma mark - 懒加载

- (NSScrollView*)scrollView{

    if(!_scrollView){

        _scrollView = [[NSScrollView alloc]init];

        [self.view addSubview:self.scrollView];

       [_scrollView setBorderType:NSNoBorder];

        _scrollView.hasHorizontalScroller = true;//水平滚动

        _scrollView.hasVerticalScroller = false;//禁止垂直滚动

        _scrollView.horizontalScrollElasticity = NSScrollElasticityAllowed; //水平的弹性属性

        _scrollView.verticalScrollElasticity = NSScrollElasticityNone; //垂直的弹性属性

       [_scrollView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];//自适应出现或隐藏滑动条

    }

    return _scrollView;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do view setup here.

    [self setLocationScrollView];//设定滑动位置，这里可以用NSButton的点击事件或其他控件的触发事件来设定

    [self layoutSubViews];//设置UI

//监听滑动位置

 [[self.scrollView contentView] setPostsBoundsChangedNotifications: YES];//发起通知

        //找个合适的地儿，注册通知

        NSNotificationCenter *center = [NSNotificationCenter defaultCenter] ;

            [center addObserver: self

                       selector: @selector(boundsDidChangeNotification:)

                           name: NSViewBoundsDidChangeNotification

                         object: [self.scrollView contentView]];

}

#pragma mark -UI布局

- (void)layoutSubViews{

    self.scrollView.frame = CGRectMake(100,100,200,44);//位置，或者用下面的

    //7.左右滚动条

    [self.scrollView mas_makeConstraints:^(MASConstraintMaker *make) {

        make.top.offset(30);

        make.left.offset(5);

        make.width.equalTo(ws.mas_width).offset(-10);

        make.height.equalTo(ws.mas_height).offset(-35);

    }];

}

#pragma mark - 监听滚动条事件

- (void) boundsDidChangeNotification: (NSNotification *) notification{

    // 在这里进行处理

    NSClipView *changedContentView = [notification object];

    // get the origin of the NSClipView of the scroll view that

    // we're watching

    NSPoint changedBoundsOrigin = [changedContentView documentVisibleRect].origin;

    //判断滚动条移动高度变化确认是否移动拉动滚动到底

    NSLog(@"滑动了：%f",changedBoundsOrigin.y);

    if (changedBoundsOrigin.y > 560) {

//        self.argeeButton.enabled = YES;

    }else{

//        self.argeeButton.enabled = NO;

    }

}

#pragma mark 设定滑动条位置

-（void）setLocationScrollView{

 float ScrollLocation = 0.0;//往右偏移量

      float MaxScroll = 0.0;//往右最大偏移量

      [[_collectionView enclosingScrollView] setLineScroll:0.0f];//NSView的enclosingScrollView属性可以获得视图的滚动条，如果视图没有滚动条则enclosingScrollView为nil。

      [[_collectionView enclosingScrollView] setPageScroll:0.0f];//NSView的enclosingScrollView属性可以获得视图的滚动条，如果视图没有滚动条则enclosingScrollView为nil。

      ScrollLocation = [[[_collectionView enclosingScrollView] contentView] bounds].origin.y;

      MaxScroll = [[[_collectionView enclosingScrollView] documentView] bounds].size.height - [[_collectionView enclosingScrollView] documentVisibleRect].size.height;

      ScrollLocation += 100;

         if(ScrollLocation < 0)

      {

          ScrollLocation = 0;

      }

         else if(ScrollLocation > MaxScroll)

      {

          ScrollLocation = MaxScroll;

      }

  [_collectionView scrollPoint:NSMakePoint(ScrollLocation, 0)];//此处才是最为关键直接触发偏移量，_collectionView是处于self.scrollView上面的控件。

 }

[_collectionView scrollPoint:NSMakePoint(ScrollLocation, 0)];//此处才是最为关键直接触发偏移量，_collectionView是处于self.scrollView上面的控件。