從UINavigationBar中的按鈕刪除閃耀效果

Question

如何從導航欄上的按鈕刪除光澤/閃耀效果？ 如果我通過使用自定義圖像自定義導航欄，按鈕不受影響，我可以從中刪除效果（線條和上光），或爲整個按鈕定義十六進制顏色代碼，甚至爲它們定義一個自定義圖像太？

Answer 1

我剛剛完成了這個過程。基本上，您需要創建自定義的可拉伸圖像並將其用作按鈕的背景以消除光芒。替換UINavigationController中的後退按鈕有點困難。爲此，我使用了UINavigationControllerDelegate來用我的自定義按鈕替換默認的後退按鈕。

下面是一些代碼：

1. 創建的UIBarButtonItem上一個類別創建您的自定義按鈕。這是我的。我使用這個類來定義包括經常欄按鈕和後退按鈕：

   @interface UIBarButtonItem (UIBarButtonItem_customBackground) 
   
   + (id) customBarButtonWithTitle:(NSString *)title target:(id)target selector:(SEL)selector; 
   + (id) customBackButtonWithTitle:(NSString *)title target:(id)target selector:(SEL)selector; 
   
   @end 
   
   @implementation UIBarButtonItem (UIBarButtonItem_customBackground) 
   
   + (id) customButtonWithImageNamed:(NSString *)imageName selectedImageNamed:(NSString *)selectedImageName leftCapWidth:(CGFloat)leftCapWidth edgeInsets:(UIEdgeInsets)edgeInsets title:(NSString *)title target:(id)target selector:(SEL)selector { 
       UIButton* customButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
       [customButton addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside]; 
       customButton.titleLabel.font = [UIFont boldSystemFontOfSize:12.0f]; 
       customButton.titleLabel.shadowColor = [UIColor colorWithRed:0.0f/255.0f green:0.0f/255.0f blue:0.0f/255.0f alpha:0.25f]; 
       customButton.titleLabel.shadowOffset = CGSizeMake(0.0f, -1.0f); 
       customButton.titleLabel.lineBreakMode = UILineBreakModeTailTruncation; 
       customButton.titleEdgeInsets = edgeInsets; 
       UIImage* navButtonBackgroundImage = [[UIImage imageNamed:imageName] stretchableImageWithLeftCapWidth:leftCapWidth topCapHeight:0.0f]; 
       UIImage* navButtonPressedBackgroundImage = [[UIImage imageNamed:selectedImageName] stretchableImageWithLeftCapWidth:leftCapWidth topCapHeight:0.0f]; 
       [customButton setBackgroundImage:navButtonBackgroundImage forState:UIControlStateNormal]; 
       [customButton setTitle:title forState:UIControlStateNormal]; 
       [customButton setBackgroundImage:navButtonPressedBackgroundImage forState:UIControlStateHighlighted]; 
       [customButton setBackgroundImage:navButtonPressedBackgroundImage forState:UIControlStateSelected]; 
   
       CGSize size = CGSizeMake(30.0f, 30.0f); 
       if (title != nil) { 
        size = [[NSString stringWithString:title] sizeWithFont:customButton.titleLabel.font]; 
       } 
       customButton.frame = CGRectMake(0.0f, 0.0f, size.width + 20.0f, 30.0f); 
       customButton.layer.shouldRasterize = YES; 
       customButton.layer.rasterizationScale = [[UIScreen mainScreen] scale]; 
       return [[[UIBarButtonItem alloc] initWithCustomView:customButton] autorelease]; 
   } 
   
   + (id) customBarButtonWithTitle:(NSString *)title target:(id)target selector:(SEL)selector { 
       return [self customButtonWithImageNamed:@"navButtonBG.png" 
          selectedImageNamed:@"navButtonPressedBG.png" 
            leftCapWidth:6.0f 
            edgeInsets:UIEdgeInsetsMake(0.0f, 5.0f, 0.0f, 5.0f) 
              title:title 
             target:target 
             selector:selector]; 
   } 
   
   + (id) customBackButtonWithTitle:(NSString *)title target:(id)target selector:(SEL)selector {  
       return [self customButtonWithImageNamed:@"backButtonBG.png" 
          selectedImageNamed:@"backButtonPressedBG.png" 
            leftCapWidth:12.0f 
            edgeInsets:UIEdgeInsetsMake(0.0f, 11.0f, 0.0f, 5.0f) 
              title:title 
             target:target 
             selector:selector]; 
   } 
   
   @end 
   

2. 添加按鈕，您的UINavigationBar的

   UIBarButtonItem* logoutButton = [UIBarButtonItem customBarButtonWithTitle:@"Logout" target:self selector:@selector(logout)]; 
   self.navigationItem.rightBarButtonItem = logoutButton; 
   

3. 如果你也想更換的UINavigationController的後退按鈕，設置一個UINavigationControllerDelegate並執行willShowViewController方法，如下所示：

   - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated { 
       if([navigationController.viewControllers count ] > 1) { 
        UIViewController* backViewController = [navigationController.viewControllers objectAtIndex:(navigationController.viewControllers.count - 2)]; 
        NSString* backText = backViewController.title; 
        UIBarButtonItem* newBackButton = [UIBarButtonItem customBackButtonWithTitle:backText target:navigationController selector:@selector(popViewControllerAnimated:)]; 
        viewController.navigationItem.leftBarButtonItem = newBackButton; 
        viewController.navigationItem.hidesBackButton = YES; 
       } 
   } 
   

4. 這裏是拉伸hable圖片我使用：

   • 後退按鈕：追問：
   • 常規按鈕：追問：

Answer 2

你必須使用圖像沒有任何光澤效果的自定義按鈕，通過它你可以擺脫導航欄中按鈕的黃金效果。

Answer 3

爲了改變後退按鈕沒有必要實施委託方法uinavigationcontroller。

您只需在設置完所需的後退按鈕後將hidesBAckButton屬性設置爲YES，就像@Justin Gallacher完美解釋的那樣。

self.navigationItem.leftBarButtonItem = [UIBarButtonItem customBackButtonWithTitle:@"Back" target:self.navigationController selector:@selector(popViewControllerAnimated:)]; 
self.navigationItem.hidesBackButton = YES;