每个（默认）选项卡栏项均由文本和图标组成。通过指定外观可以很容易地全局更改文本颜色：
// you can add this pre to you AppDelegate application:didFinishLaunchingWithOptions: // or add it to viewDidLoad method of your TabBarController classUITabBarItem.appearance().setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.magentaColor()], forState:.Normal)UITabBarItem.appearance().setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.redColor()], forState:.Selected)
对于图像，情况要复杂一些。您不能全局定义它们的外观。您应该在TabBarController类中重新定义它们。将下面的代码添加到
viewDidLoad您的
TabBarController类的方法中：
for item in self.tabBar.items as [UITabBarItem] { if let image = item.image { item.image = image.imageWithColor(UIColor.yellowColor()).imageWithRenderingMode(.AlwaysOriginal) }}众所周知
imageWithColor(...)，UIImage类中没有方法。所以这是扩展实现：
// Add anywhere in your appextension 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, .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 }}
