tableView滚动时(渐变)隐藏显示导航栏

//添加头部<pre name="code" class="objc">-(void)createHeadImageView{
    
    UIImage *image =[UIImage imageNamed:@"组-5"];
    headImageBJView = [[UIImageView alloc] initWithFrame: CGRectMake(0, 0, mDeviceWidth, 210)];
    headImageBJView.image = image;
       headImageBJView.userInteractionEnabled=YES;
    
    //自定义的导航栏
    navView=[[UIView alloc]init];
    navView.frame =CGRectMake(0, 0, mDeviceWidth, 64);
    navView.backgroundColor=fontHightRedColor;
    [headImageBJView addSubview:navView];
    navView.alpha=0; //先使导航栏透明不显示
    
    //导航栏的标题
    UILabel *label = [[UILabel alloc] init];
    label.frame = CGRectMake(0, 20, mDeviceWidth, 64-20);
    label.backgroundColor = [UIColor clearColor];
    label.textColor = [UIColor whiteColor];
    label.text = @"我的";
    label.textAlignment = NSTextAlignmentCenter;
    label.font = [UIFont fontWithName:uFont_B size:20];
    label.numberOfLines = 0;
    [navView addSubview:label];
    [self.view addSubview:headImageBJView];

}


-(void)setUpTableView{
    
    PersonTableView *personTableView =[[PersonTableView alloc]initWithFrame:CGRectMake(0, 64, mDeviceWidth, mDeviceHeight-44-64) style:UITableViewStylePlain];
    personTableView.tabNavView=navView;
    personTableView.headImageView=headImageBJView;
     personTableView.headImageView.contentMode=UIViewContentModeScaleAspectFill ;
    personTableView.personTableDelegate=self;
    //背景
    UIImageView *headImageView = [[UIImageView alloc] initWithFrame: CGRectMake(0, 64, mDeviceWidth, 145.0)];
    headImageView.backgroundColor =[UIColor clearColor];
    //头像
    UIImageView *headimageView = [[UIImageView alloc] init];
    headimageView.frame = CGRectMake(mDeviceWidth/2-40, 20, 80, 80);
    headimageView.image = [UIImage imageNamed:@"组-6"];

    headimageView.layer.cornerRadius=40;
    headimageView.layer.masksToBounds=YES;
    [headImageView addSubview:headimageView];
    //name
    UILabel *namelabel = [[UILabel alloc] init];
    namelabel.frame = CGRectMake(0, 95, mDeviceWidth, 30);
    namelabel.backgroundColor = [UIColor clearColor];
    namelabel.textColor =fontHightColor;
    namelabel.text = @"哈哈哈哈名字";
    namelabel.textAlignment = NSTextAlignmentCenter;
    namelabel.font =[UIFont fontWithName:uFont size:14];
    namelabel.numberOfLines = 0;
    [headImageView addSubview:namelabel];
    
    //详细
    UILabel *detaillabel = [[UILabel alloc] init];
    detaillabel.frame = CGRectMake(0, 115, mDeviceWidth, 30);
    detaillabel.backgroundColor = [UIColor clearColor];
    detaillabel.textColor =fontNomalColor;
    detaillabel.text = @"哈哈哈哈";
    detaillabel.textAlignment = NSTextAlignmentCenter;
    detaillabel.font = [UIFont fontWithName:uFont size:10];
    detaillabel.numberOfLines = 0;
    [headImageView addSubview:detaillabel];

    personTableView.backgroundColor=[UIColor clearColor];
    [personTableView setTableHeaderView:headImageView];
    [self.view addSubview:personTableView];
    
    
}

//scrollView的代理获取列表滚动的距离-(void)scrollViewDidScroll:(UIScrollView *)scrollView{ int contentOffSetY = scrollView.contentOffset.y; DLog(@"contentOffSetY:%d,selfheadImageView:%@",contentOffSetY,NSStringFromCGRect(self.headImageView.frame)); if (contentOffSetY<145.0){ self.tabNavView.alpha=scrollView.contentOffset.y/145.0; }else { self.tabNavView.alpha=1; } if (contentOffSetY<0) { CGRect rect =self.headImageView.frame; rect.origin.y =0; rect.size.height=-contentOffSetY+209; self.headImageView.frame =rect;// DLog(@"contentOffSetY---:%d,selfheadImageView:---%@",contentOffSetY,NSStringFromCGRect(self.headImageView.frame)); } }
//刚开始

//滑动列表准备显示导航栏

//导航栏完全显示

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