iOS自定义导航栏

1. 完全透明的导航栏

完全透明的导航栏经常出现在首页、详情页、登录、个人中心等页面，以下是一些APP的例子，当页面向上滑动时再加上一些过渡效果，的确很吸引眼球，这种设计个人也是非常喜欢。

京东首页 个人中心 登录 详情

实现下图所示的效果：

详情

方法如下：

//全透明，一般在viewWillAppear
+ (void)createCompletelyTransparentNavigationBar:(UIViewController *)sender
{
    [sender.navigationController.navigationBar setBackgroundImage:[UIImage new]
                                                  forBarMetrics:UIBarMetricsDefault];
    sender.navigationController.navigationBar.shadowImage = [UIImage new];
    sender.navigationController.navigationBar.translucent = YES;
    sender.navigationController.view.backgroundColor = [UIColor clearColor];
    sender.navigationController.navigationBar.backgroundColor = [UIColor clearColor];
}

//恢复成默认，一般在viewWillDisappear
+ (void)createDefaultNavigationBar:(UIViewController *)sender
{
    [sender.navigationController.navigationBar setBackgroundImage:nil
                                                  forBarMetrics:UIBarMetricsDefault];
}

自定义导航栏返回按钮：

#pragma mark - 
#pragma mark - 自定义导航栏按钮 返回按钮 或者其他按钮
- (void)createCustomNavigationBackOrOtherButton
{
    UIButton *backBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    backBtn.frame = CGRectMake(0, 0, 32, 32);
    [backBtn addTarget:self action:@selector(navCustomBackButtonPressed) forControlEvents:UIControlEventTouchUpInside];
    [backBtn setImage:[UIImage imageNamed:@"NavBackCustomImg"] forState:UIControlStateNormal];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backBtn];
   // self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"NavBackCustomImg"] style:UIBarButtonItemStyleBordered target:self action:@selector(navCustomBackButtonPressed)];
    //解决自定义了leftBarbuttonItem左滑返回手势失效了的问题
    self.navigationController.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)self;
}

- (void)navCustomBackButtonPressed
{
    [self.navigationController popViewControllerAnimated:YES];
}