當滾動uiwebview時隱藏並顯示導航欄

我需要幫助，我正在嘗試構建一個應用程序，其中我有一個viewcontroller，其中uiwebview和一個navbar以及2個按鈕。我想要做的是，當用戶滾動uiwebview navbar自動隱藏起來就像滑了起來一樣。但不是他們工作的方式，我想讓它工作。讓我在這裏發佈代碼。在viewdidload我把這個。當滾動uiwebview時隱藏並顯示導航欄

[webPage.scrollView setDelegate:self];

，然後我有這個方法

- (void) scrollViewDidScroll:(UIScrollView *)scrollView { 
    if(scrollView.contentOffset.y == 0) { 
     //show 
     NSLog(@"Show"); 
     [self.navigationController setNavigationBarHidden:NO animated:YES]; 
    } else { 
     NSLog(@"Hide"); 
     [self.navigationController setNavigationBarHidden:YES animated:YES]; 
     //hide 
    } 
}

它正確NSLog但沒有別的navbar仍然停留。 :(

來源

2014-01-11 user2966615

請記住，didScroll將被調用每個（幾乎）像素更改。隱藏和顯示的條件將需要包含像offset danh

所以你建議。對不起，我是新的。 :) – user2966615

你可以試試這個：

聲明導航欄，與您的導航欄的高度和2個布爾變量恆定：

UINavigationBar *navBar; 

static const CGFloat kNavBarHeight = 60.0f; 

BOOL webViewScrollIsDragging; 
BOOL webViewScrollIsDecelerating;

2.在viewDidLoad中寫如下：

[webView.scrollView setContentInset:UIEdgeInsetsMake(kNavBarHeight, 0, 0, 0)]; 
[webView.scrollView setScrollIndicatorInsets:UIEdgeInsetsMake(kNavBarHeight, 0, 0, 0)]; 
[webView.scrollView setContentOffset:CGPointMake(0, -kNavBarHeight) animated:NO]; 
webView.scrollView.delegate = self;

然後初始化並添加您的UINavigationBar爲在原產地爲self.view的子視圖（也請確保您的UIWebView具有相同的來源，即（0,0））。

實現UIScrollViewDelegate方法（不要忘了添加UIScrollViewDelegate協議）：

#pragma mark - UIScrollViewDelegate Methods 
- (void)scrollViewDidScroll:(UIScrollView *)scrollView 
{ 
    if (scrollView == webview.scrollView) 
    { 
     if (scrollView.contentOffset.y == 1 && !webViewScrollIsDragging && !webViewScrollIsDecelerating) 
     { 
      [UIView animateWithDuration:0.3 
            delay:0.0 
           options: UIViewAnimationCurveEaseOut 
          animations:^(void) { 
           CGRect navBarFrame = CGRectMake(0,-scrollView.contentOffset.y-kNavBarHeight, self.view.bounds.size.width, kNavBarHeight); 
           navBar.frame = navBarFrame; 
          } 
          completion:nil]; 
     } 
     else 
     { 
      CGRect navBarFrame = CGRectMake(0,-scrollView.contentOffset.y-kNavBarHeight, self.view.bounds.size.width, kNavBarHeight); 
      navBar.frame = navBarFrame; 
     } 

     if (scrollView.contentOffset.y < -kNavBarHeight) 
     { 
      [webview.scrollView setScrollIndicatorInsets:UIEdgeInsetsMake(fabsf(scrollView.contentOffset.y), 0, 0, 0)]; 
     } 
    } 
} 

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView 
{ 
    if (scrollView == webview.scrollView) 
    { 
     webViewScrollIsDragging = YES; 
    } 
} 

- (void) scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate 
{ 
    if (scrollView == webview.scrollView) 
    { 
     webViewScrollIsDragging = NO; 
    } 
} 

- (void) scrollViewWillBeginDecelerating:(UIScrollView *)scrollView 
{ 
    if (scrollView == webview.scrollView) 
    { 
     webViewScrollIsDecelerating = YES; 
    } 
} 

- (void) scrollViewDidEndDecelerating:(UIScrollView *)scrollView 
{ 
    if (scrollView == webview.scrollView) 
    { 
     webViewScrollIsDecelerating = NO; 
    } 
}

來源

2014-01-11 08:06:01

謝謝你的幫助。 – user2966615

爲方便在視圖控制器實現文件添加這個（.M）：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    self.webView.scrollView.delegate = self; 
} 

#pragma mark - UIScrollViewDelegate Methods 

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView 
{ 
    self.lastOffsetY = scrollView.contentOffset.y; 
} 

- (void) scrollViewWillBeginDecelerating:(UIScrollView *)scrollView 
{ 
    bool hide = (scrollView.contentOffset.y > self.lastOffsetY); 
    [[self navigationController] setNavigationBarHidden:hide animated:YES]; 

}

並且不要忘記在頭文件（.h）中添加UIScrollViewDelegate協議：

@interface MyViewController : UIViewController <UIScrollViewDelegate> 
    ... 
@end

來源

2014-03-26 18:44:23 eduludi

在iOS8.0後來只使用一行代碼：

self.navigationController.hidesBarsOnSwipe = YES; 


/// When the user swipes, the navigation controller's navigationBar & toolbar will be hidden (on a swipe up) or shown (on a swipe down). The toolbar only participates if it has items. 
// @property (nonatomic, readwrite, assign) BOOL hidesBarsOnSwipe NS_AVAILABLE_IOS(8_0) __TVOS_PROHIBITED;

當向下滑動將隱藏導航欄（併成爲透明狀態巴），當滑動將導航欄上顯示，動畫過程

來源

2017-02-12 14:31:08 mamian

當滾動uiwebview時隱藏並顯示導航欄

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