IOS 8标签栏项目背景颜色

在您的tabBarController中,您可以设置默认的UITabBar tintColor,barTintColor,selectionIndicatorImage(在这里作弊)和renderingMode的图像,请参阅以下注释：

class MyTabBarController: UITabBarController,UINavigationControllerDelegate {
      ...
      override func viewDidLoad() {
        ...
        // Sets the default color of the icon of the selected UITabBarItem and Title
        UITabBar.appearance().tintColor = UIColor.redColor()

        // Sets the default color of the background of the UITabBar
        UITabBar.appearance().barTintColor = UIColor.blackColor()

        // Sets the background color of the selected UITabBarItem (using and plain colored UIImage with the width = 1/5 of the tabBar (if you have 5 items) and the height of the tabBar)
        UITabBar.appearance().selectionIndicatorImage = UIImage().makeImageWithColorAndSize(UIColor.blueColor(),size: CGSizeMake(tabBar.frame.width/5,tabBar.frame.height))

        // Uses the original colors for your images,so they aren't not rendered as grey automatically.
        for item in self.tabBar.items as! [UITabBarItem] {
          if let image = item.image {
            item.image = image.imageWithRenderingMode(.AlwaysOriginal)
          }
        }
      }
      ...
    }

并且您将需要扩展UIImage类以使您需要的大小为纯色图像：

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