如何在swift中更改选项卡栏的着色颜色？

我正在使用标签栏，我有两个颜色问题

第一个问题，色调为灰色，我使用了一些代码将其更改为白色，但只有在按下tab键时才会变为白色

class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

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

    let barColor = UIColor(red: 49/255, green: 75/255, blue: 108/255, alpha: 1.0)
    let pressedTintColor = UIColor.whiteColor()

    UITabBar.appearance().barTintColor = barColor
    UITabBar.appearance().tintColor = pressedTintColor

        return true
}

第二个问题，按下的标签的背景色应该会改变，但不会改变

这就是选项卡栏的外观。

这就是它应该看起来的样子

（第一张图片和测试一样在Xcode模拟器中，第二张图片是它的设计，所以关于标签的图像和文本并不重要）

---

因此，假设所有选项卡始终为白色，当按下选项卡仅更改选项卡的背景色时。

要解决

AppDelegate中的问题，请执行以下操作：

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

    UITabBar.appearance().tintColor = UIColor.whiteColor()
    UITabBarItem.appearance().setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.whiteColor()], forState: UIControlState.Normal)

    return true
}

在
ViewController
中执行以下操作：

extension UIImage {
    func makeImageWithColorAndSize(color: UIColor, size: CGSize) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(size, false, 0)
        color.setFill()
        UIRectFill(CGRectMake(0, 0, size.width, size.height))
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}

extension UIImage {
    func imageWithColor(tintColor: 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, CGBlendMode.Normal)

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

        let newImage = UIGraphicsGetImageFromCurrentImageContext() as UIImage
        UIGraphicsEndImageContext()

        return newImage
    }
}

class FirstViewController: UIViewController {

    var tabBar: UITabBar?

    override func viewDidLoad() {
        super.viewDidLoad()

        tabBar = self.tabBarController!.tabBar
        tabBar!.selectionIndicatorImage = UIImage().makeImageWithColorAndSize(UIColor.blueColor(), size: CGSizeMake(tabBar!.frame.width/CGFloat(tabBar!.items!.count), tabBar!.frame.height))

        // To change tintColor for unselected tabs
        for item in tabBar!.items! as [UITabBarItem] {
            if let image = item.image {
                item.image = image.imageWithColor(UIColor.whiteColor()).imageWithRenderingMode(.AlwaysOriginal)
            }
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

*
UIImage
的第一个扩展名取自同一作者的另一个问题：