是否可以更改UITabBarItem徽章颜色

时间:2012-11-12 09:59:29

标签: iphone objective-c ios uitabbar uitabbaritem

我想更改UITabBarItem 徽章的背景颜色,但无法找到有关如何制作它的任何资源。

enter image description here

14 个答案:

答案 0 :(得分:28)

UITabBarItem自iOS 10起就可以使用。

var badgeColor: UIColor? { get set }

它也可以通过外观获得。

if #available(iOS 10, *) {
   UITabBarItem.appearance().badgeColor = .green
}

参考文档: https://developer.apple.com/reference/uikit/uitabbaritem/1648567-badgecolor

答案 1 :(得分:12)

我为我的应用编写了这段代码,但我只是在iOS 7中测试过它。

for (UIView* tabBarButton in self.tabBar.subviews) {
    for (UIView* badgeView in tabBarButton.subviews) {
        NSString* className = NSStringFromClass([badgeView class]);

        // looking for _UIBadgeView
        if ([className rangeOfString:@"BadgeView"].location != NSNotFound) {
            for (UIView* badgeSubview in badgeView.subviews) {
                NSString* className = NSStringFromClass([badgeSubview class]);

                // looking for _UIBadgeBackground
                if ([className rangeOfString:@"BadgeBackground"].location != NSNotFound) {
                    @try {
                        [badgeSubview setValue:[UIImage imageNamed:@"YourCustomImage.png"] forKey:@"image"];
                    }
                    @catch (NSException *exception) {}
                }

                if ([badgeSubview isKindOfClass:[UILabel class]]) {
                    ((UILabel *)badgeSubview).textColor = [UIColor greenColor];
                }
            }
        }
    }
}

您只能使用图片而不是颜色更新徽章背景。如果您想以某种方式更新徽章标签,我也会公开。

重要的是要注意,必须在设置tabBarItem.badgeValue

后调用此代码

编辑:2014年4月14日

以上代码在任何地方调用时都适用于iOS 7。要使其在iOS 7.1中运行,请在视图控制器-viewWillLayoutSubviews中调用它。

编辑:2014年12月22日

这是我目前正在使用的更新代码段。为简单起见,我将代码放在类别扩展名中。

- (void)badgeViews:(void (^)(UIView* badgeView, UILabel* badgeLabel, UIView* badgeBackground))block {
    if (block) {
        for (UIView* tabBarButton in self.subviews) {
            for (UIView* badgeView in tabBarButton.subviews) {
                NSString* className = NSStringFromClass([badgeView class]);

                if ([className rangeOfString:@"BadgeView"].location != NSNotFound) {
                    UILabel* badgeLabel;
                    UIView* badgeBackground;

                    for (UIView* badgeSubview in badgeView.subviews) {
                        NSString* className = NSStringFromClass([badgeSubview class]);

                        if ([badgeSubview isKindOfClass:[UILabel class]]) {
                            badgeLabel = (UILabel *)badgeSubview;

                        } else if ([className rangeOfString:@"BadgeBackground"].location != NSNotFound) {
                            badgeBackground = badgeSubview;
                        }
                    }

                    block(badgeView, badgeLabel, badgeBackground);
                }
            }
        }
    }
}

然后,当您准备好打电话时,它就会显示出来。

[self.tabBar badgeViews:^(UIView *badgeView, UILabel *badgeLabel, UIView *badgeBackground) {

}];

编辑:2015年11月16日

我注意到有些人需要更清楚地了解此代码中发生的事情。 for循环正在搜索一些不可公开访问的视图。通过检查视图类名是否包含预期名称的一部分,它确保到达预期视图,同时不会出现Apple的任何可能的危险信号。一旦找到所有内容,就会执行一个块,可以轻松访问这些视图。

值得注意的是,此代码可能会在未来的iOS更新中停止工作。例如,这些内部视图有一天可能会获得不同的类名。然而,这种可能性几乎没有,因为即使在内部,Apple也很少重构这种性质的课程。但即使他们这样做,它也会成为UITabBarBadgeView的标题,它仍然会达到代码中的预期点。由于iOS9完全出门,而且这段代码仍在按预期运行,您可以预期这个问题永远不会出现。

答案 2 :(得分:12)

现在,使用badgeColor内的UITabBarItem属性,iOS 10及更高版本本身支持更改徽章颜色。有关该房产的更多信息,请参阅apple docs

示例:

  • Swift 3:myTab.badgeColor = UIColor.blue
  • Objective-C:[myTab setBadgeColor:[UIColor blueColor]];

答案 3 :(得分:10)

我有同样的问题并通过创建一个用可以轻松自定义的UILabel替换BadgeView的小类来解决它。

https://github.com/enryold/UITabBarItem-CustomBadge/

答案 4 :(得分:10)

对于使用Swift的人,我设法改进了TimWhiting的答案,以便让徽章视图处于任何屏幕尺寸和任何方向

 extension UITabBarController {

    func setBadges(badgeValues: [Int]) {

        for view in self.tabBar.subviews {
            if view is CustomTabBadge {
                view.removeFromSuperview()
            }
        }

        for index in 0...badgeValues.count-1 {
            if badgeValues[index] != 0 {
                addBadge(index, value: badgeValues[index], color:UIColor(paletteItem: .Accent), font: UIFont(name: Constants.ThemeApp.regularFontName, size: 11)!)
            }
        }
    }

    func addBadge(index: Int, value: Int, color: UIColor, font: UIFont) {
        let badgeView = CustomTabBadge()

        badgeView.clipsToBounds = true
        badgeView.textColor = UIColor.whiteColor()
        badgeView.textAlignment = .Center
        badgeView.font = font
        badgeView.text = String(value)
        badgeView.backgroundColor = color
        badgeView.tag = index
        tabBar.addSubview(badgeView)

        self.positionBadges()
    }

    override public func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        self.positionBadges()
    }

    // Positioning
    func positionBadges() {

        var tabbarButtons = self.tabBar.subviews.filter { (view: UIView) -> Bool in
            return view.userInteractionEnabled // only UITabBarButton are userInteractionEnabled
        }

        tabbarButtons = tabbarButtons.sort({ $0.frame.origin.x < $1.frame.origin.x })

        for view in self.tabBar.subviews {
            if view is CustomTabBadge {
                let badgeView = view as! CustomTabBadge
                self.positionBadge(badgeView, items:tabbarButtons, index: badgeView.tag)
            }
        }
    }

    func positionBadge(badgeView: UIView, items: [UIView], index: Int) {

        let itemView = items[index]
        let center = itemView.center

        let xOffset: CGFloat = 12
        let yOffset: CGFloat = -14
        badgeView.frame.size = CGSizeMake(17, 17)
        badgeView.center = CGPointMake(center.x + xOffset, center.y + yOffset)
        badgeView.layer.cornerRadius = badgeView.bounds.width/2
        tabBar.bringSubviewToFront(badgeView)
    }
}

class CustomTabBadge: UILabel {}

答案 5 :(得分:7)

不,你不能改变颜色,但你可以使用自己的徽章。在文件范围添加此扩展,您可以随意自定义徽章。只需在任何根视图控制器中调用self.tabBarController!.setBadges([1,0,2])即可。

要明确的是标签栏有三个项目,徽章值从左到右。

extension UITabBarController {
    func setBadges(badgeValues:[Int]){

        var labelExistsForIndex = [Bool]()

        for value in badgeValues {
            labelExistsForIndex.append(false)
        }

        for view in self.tabBar.subviews {
            if view.isKindOfClass(PGTabBadge) {
                let badgeView = view as! PGTabBadge
                let index = badgeView.tag

                if badgeValues[index]==0 {
                    badgeView.removeFromSuperview()
                }

                labelExistsForIndex[index]=true
                badgeView.text = String(badgeValues[index])

            }
        }

        for var i=0;i<labelExistsForIndex.count;i++ {
            if labelExistsForIndex[i] == false {
                if badgeValues[i] > 0 {
                    addBadge(i, value: badgeValues[i], color:UIColor(red: 4/255, green: 110/255, blue: 188/255, alpha: 1), font: UIFont(name: "Helvetica-Light", size: 11)!)
                }
            }
        }


    }

    func addBadge(index:Int,value:Int, color:UIColor, font:UIFont){

        let itemPosition = CGFloat(index+1)
        let itemWidth:CGFloat = tabBar.frame.width / CGFloat(tabBar.items!.count)

        let bgColor = color

        let xOffset:CGFloat = 12
        let yOffset:CGFloat = -9

        var badgeView = PGTabBadge()
        badgeView.frame.size=CGSizeMake(17, 17)
        badgeView.center=CGPointMake((itemWidth * itemPosition)-(itemWidth/2)+xOffset, 20+yOffset)
        badgeView.layer.cornerRadius=badgeView.bounds.width/2
        badgeView.clipsToBounds=true
        badgeView.textColor=UIColor.whiteColor()
        badgeView.textAlignment = .Center
        badgeView.font = font
        badgeView.text = String(value)
        badgeView.backgroundColor = bgColor
        badgeView.tag=index
        tabBar.addSubview(badgeView)

    }
}

class PGTabBadge: UILabel {

}

答案 6 :(得分:7)

Swift 3 以下是@ Kirualex的答案的更新版本(在TimWhiting的答案中得到了改进)。

extension UITabBarController {

    func setBadges(badgeValues: [Int]) {

        for view in self.tabBar.subviews {
            if view is CustomTabBadge {
                view.removeFromSuperview()
            }
        }

        for index in 0...badgeValues.count-1 {
            if badgeValues[index] != 0 {
                addBadge(index: index, value: badgeValues[index], color: UIColor.blue, font: UIFont(name: "Helvetica-Light", size: 11)!)
            }
        }
    }

    func addBadge(index: Int, value: Int, color: UIColor, font: UIFont) {
        let badgeView = CustomTabBadge()

        badgeView.clipsToBounds = true
        badgeView.textColor = UIColor.white
        badgeView.textAlignment = .center
        badgeView.font = font
        badgeView.text = String(value)
        badgeView.backgroundColor = color
        badgeView.tag = index
        tabBar.addSubview(badgeView)

        self.positionBadges()
    }

    override open func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        self.positionBadges()
    }

    // Positioning
    func positionBadges() {

        var tabbarButtons = self.tabBar.subviews.filter { (view: UIView) -> Bool in
            return view.isUserInteractionEnabled // only UITabBarButton are userInteractionEnabled
        }

        tabbarButtons = tabbarButtons.sorted(by: { $0.frame.origin.x < $1.frame.origin.x })

        for view in self.tabBar.subviews {
            if view is CustomTabBadge {
                let badgeView = view as! CustomTabBadge
                self.positionBadge(badgeView: badgeView, items:tabbarButtons, index: badgeView.tag)
            }
        }
    }

    func positionBadge(badgeView: UIView, items: [UIView], index: Int) {

        let itemView = items[index]
        let center = itemView.center

        let xOffset: CGFloat = 12
        let yOffset: CGFloat = -14
        badgeView.frame.size = CGSize(width: 17, height: 17)
        badgeView.center = CGPoint(x: center.x + xOffset, y: center.y + yOffset)
        badgeView.layer.cornerRadius = badgeView.bounds.width/2
        tabBar.bringSubview(toFront: badgeView)
    }
}

class CustomTabBadge: UILabel {}

答案 7 :(得分:4)

似乎没有。您只能设置值。 从Apple的文档徽章是:

  

项目右上角显示的文字带有   围绕红色椭圆形。

答案 8 :(得分:1)

您需要在索引处指定标签项以更改徽标颜色,此颜色在iOS 10中可用,

    if #available(iOS 10.0, *) 
    {
        self.kAppTabBarController.tabBar.items![1].badgeColor = YOUR_COLOR
    }

答案 9 :(得分:0)

是,但唯一可行的解​​决方案是创建自定义Tabbar并创建自定义tabbar徽章图标。您将找到许多用于创建自定义tabbar的文章/代码。

答案 10 :(得分:0)

// change TabBar BadgeView background Color
-(void)changeTabBarBadgeViewBgColor:(UITabBar*)tabBar {
    for (UIView* tabBarButton in tabBar.subviews) {
        for (UIView* badgeView in tabBarButton.subviews) {
            NSString* className = NSStringFromClass([badgeView class]);

            // looking for _UIBadgeView
            if ([className rangeOfString:@"BadgeView"].location != NSNotFound) {
                for (UIView* badgeSubview in badgeView.subviews) {
                    NSString* className = NSStringFromClass([badgeSubview class]);

                    // looking for _UIBadgeBackground
                    if ([className rangeOfString:@"BadgeBackground"].location != NSNotFound) {
                        @try {
                            [badgeSubview setValue:nil forKey:@"image"];
                            [badgeSubview setBackgroundColor:[UIColor blueColor]];
                            badgeSubview.clipsToBounds = YES;
                            badgeSubview.layer.cornerRadius = badgeSubview.frame.size.height/2;
                        }
                        @catch (NSException *exception) {}
                    }

                    if ([badgeSubview isKindOfClass:[UILabel class]]) {
                        ((UILabel *)badgeSubview).textColor = [UIColor greenColor];
                    }
                }
            }
        }
    }
}

enter image description here

答案 11 :(得分:0)

现在,您也可以在情节提要中执行此操作,方法是选择选项卡栏项,然后转到属性检查器。

enter image description here

答案 12 :(得分:0)

嗯...这很容易。 [[self tabBarItem] setBadgeColor:[UIColor greenColor]];

答案 13 :(得分:-2)

看看@ UITabbarItem-CustomBadge

完整演示如下

Demonstration

如果你想使用默认的实现

,它只需要两行代码
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

  //supplying the animation parameter
  [UITabBarItem setDefaultAnimationProvider:[[DefaultTabbarBadgeAnimation alloc] init]];
  [UITabBarItem setDefaultConfigurationProvider:[[DefaultSystemLikeBadgeConfiguration alloc] init]];

  //rest of your code goes following...

  return YES;
}