下拉放大和渐变导航栏控制器

LCStretchableHeaderViewController

功能介绍

• 提供一个UIViewController的子类LCStretchableHeaderViewController，支持设置stretchableHeader，实现下拉的时候，header放大，类似于qq空间的效果
• 支持向上滑动，导航栏的颜色渐变效果
• 提供代理，当navigationBar在Transparent和Normal状态切换的时候，设置navigationBar的子视图的样式

---

如何使用

• pod "LCStretchableHeaderViewController"
• 使用代码示例：

//配置
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self setupUI];
}
- (void)setupUI
{
    self.view.backgroundColor = [UIColor whiteColor];
    self.title = @"DEMO";
    self.navBarNormalColor = [UIColor greenColor];
    self.ignoredTopOffset = 200;//这个高度一般设置的跟headerView的一样
    
    //add subview
    self.headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, 200)];
    self.headerView.backgroundColor = [UIColor redColor];
    //set frame
    UITableView *tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height) style:UITableViewStyleGrouped];
    tableView.rowHeight = 88;
    tableView.delegate = self;
    tableView.dataSource = self;
    self.containerView = tableView;
}

//代理：根据状态的不同修改item的颜色
- (void)lc_navgigationBarStateChanged:(LCNavigationBarState)barState
{
    NSLog(@"state = %ld", barState);
    if (barState == LCNavigationBarStateTransparent)
    {
        self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Transparent" style:UIBarButtonItemStylePlain target:nil action:nil];
        [self.navigationItem.rightBarButtonItem setTintColor:[UIColor whiteColor]];
        [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];
    }else
    {
        self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Normal" style:UIBarButtonItemStylePlain target:nil action:nil];
        [self.navigationItem.rightBarButtonItem setTintColor:[UIColor blackColor]];
        [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor blackColor]}];
    }
}

效果截图

demo.gif

git:https://github.com/jayhe/LCStretchableHeaderViewController