我一直在试图找到最后一周的解决方案,在尝试我可以找到或想到的所有可能的解决方案后,我都没有运气.我发现和尝试的每个解决方案都没有工作,或者已经过时了.
我在UITabBarController中的UITabBar中有5个UITabBarItem.当选择UITabBarItem时,我想更改背景颜色,当然,当所选项目更改时,它将会更改.
我在Xcode 6.3.1中使用Swift和iOS SDK 8.3.如果您只能在Objective-C中答案,那么任何答案都将有所帮助！谢谢大家提前,我真的很感激！
编辑：这是我想要做的一个视觉示例.
解决方法
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
}
}
