从UINavigationBar中的按钮删除闪耀效果

Question

如何从导航栏上的按钮删除光泽/闪耀效果？ 如果我通过使用自定义图像自定义导航栏，按钮不受影响，我可以从中删除效果（线条和上光），或为整个按钮定义十六进制颜色代码，甚至为它们定义一个自定义图像太？

Answer 1

我刚刚完成了这个过程。基本上，您需要创建自定义的可拉伸图像并将其用作按钮的背景以消除光芒。替换UINavigationController中的后退按钮有点困难。为此，我使用了UINavigationControllerDelegate来用我的自定义按钮替换默认的后退按钮。

下面是一些代码：

1. 创建的UIBarButtonItem上一个类别创建您的自定义按钮。这是我的。我使用这个类来定义包括经常栏按钮和后退按钮：

   @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. 添加按钮，您的UINavigationBar的

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

3. 如果你也想更换的UINavigationController的后退按钮，设置一个UINavigationControllerDelegate并执行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. 这里是拉伸hable图片我使用：

   • 后退按钮：追问：
   • 常规按钮：追问：

Answer 2

你必须使用图像没有任何光泽效果的自定义按钮，通过它你可以摆脱导航栏中按钮的黄金效果。

Answer 3

为了改变后退按钮没有必要实施委托方法uinavigationcontroller。

您只需在设置完所需的后退按钮后将hidesBAckButton属性设置为YES，就像@Justin Gallacher完美解释的那样。

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