如何快速更改选项卡栏未选中图标的颜色？

Question

如何更改选项卡栏未选中图标和文本的颜色？ 我找到了这个答案（ 如何更改选项卡栏上非活动图标/文本的颜色？ ），但无法快速实现。

Answer 1

iOS 10

class TabBarVC: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // make unselected icons white
        self.tabBar.unselectedItemTintColor = UIColor.white
    }
}

Answer 2

下面为所有UITabBarItem设置了默认值，您可以将其添加到您的AppDelegate 。 它将更改您的文本颜色。

UITabBarItem.appearance().setTitleTextAttributes({NSForegroundColorAttributeName: UIColor.blackColor()}, forState:.Selected)
UITabBarItem.appearance().setTitleTextAttributes({NSForegroundColorAttributeName: UIColor.whiteColor()}, forState:.Normal)

要更改图标的颜色，您可以将图像设置为图像已经具有良好颜色的给定状态。

self.tabBarItem.selectedImage = [[UIImage imageNamed:@"selectedImage"]
imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

self.tabBarItem.image = [[UIImage imageNamed:@"notSelectedImage"] 
imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

或者，您可以通过以下方式进行操作：

向UIImage类添加扩展（从此答案开始 ）：

extension UIImage {
func imageWithColor(color1: UIColor) -> UIImage {
    UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)

    let context = UIGraphicsGetCurrentContext() as CGContextRef
    CGContextTranslateCTM(context, 0, self.size.height)
    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextSetBlendMode(context, kCGBlendModeNormal)

    let rect = CGRectMake(0, 0, self.size.width, self.size.height) as CGRect
    CGContextClipToMask(context, rect, self.CGImage)
    color1.setFill()
    CGContextFillRect(context, rect)

    let newImage = UIGraphicsGetImageFromCurrentImageContext() as UIImage
    UIGraphicsEndImageContext()

    return newImage
}
}

在您的viewDidLoad ：

for item in self.tabBar.items as [UITabBarItem] {
    if let image = item.image {
        item.image = image.imageWithColor(UIColor.blackColor()).imageWithRenderingMode(.AlwaysOriginal)
    }
}

Answer 3

在iOS 11中，您可以直接在情节提要中的UIToolBar上设置属性：

unselectedItemTintColor | 颜色| [所需颜色]

Xcode打印

Answer 4

补充@BoilingLime的答案，在这里它是Swift 3中第二种替代方法的UIImage扩展：

extension UIImage {
func imageWithColor(color1: UIColor) -> UIImage {
    UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)

    let context = UIGraphicsGetCurrentContext()! as CGContext
    context.translateBy(x: 0, y: self.size.height)
    context.scaleBy(x: 1.0, y: -1.0);
    context.setBlendMode(CGBlendMode.normal)

    let rect = CGRect(x: 0, y: 0, width: self.size.width, height: self.size.height)
    context.clip(to: rect, mask: self.cgImage!)
    color1.setFill()
    context.fill(rect)

    let newImage = UIGraphicsGetImageFromCurrentImageContext()! as UIImage
    UIGraphicsEndImageContext()

    return newImage
}
}

Answer 5

迅捷4+

UITabBar.appearance().unselectedItemTintColor = UIColor.green

在appDelegate's didFinishLaunchingWithOptions方法中使用此代码。

Answer 6

如果您正在寻找iOS 11 swift 4解决方案，请在appDelegate中执行类似的操作。 这会将所有未选中的选项卡栏项目更改为黑色。

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.

    UITabBar.appearance().unselectedItemTintColor = UIColor(displayP3Red: 0, green: 0, blue: 0, alpha: 1)

    return true
}