1. 完全透明的導(dǎo)航欄

完全透明的導(dǎo)航欄經(jīng)常出現(xiàn)在首頁、詳情頁、登錄、個人中心等頁面，以下是一些APP的例子，當(dāng)頁面向上滑動時再加上一些過渡效果，的確很吸引眼球，這種設(shè)計個人也是非常喜歡。

京東首頁

個人中心

登錄

詳情

實現(xiàn)下圖所示的效果：

詳情

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];
}

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

自定義導(dǎo)航欄返回按鈕：

#pragma mark - 
#pragma mark - 自定義導(dǎo)航欄按鈕 返回按鈕 或者其他按鈕
- (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)];
    //解決自定義了leftBarbuttonItem左滑返回手勢失效了的問題
    self.navigationController.interactivePopGestureRecognizer.delegate = (id<UIGestureRecognizerDelegate>)self;
}

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