uitabbar在iOS7上更改一个uitabbaritem的背景颜色 [英] uitabbar change background color of one uitabbaritem on iOS7

问题描述

我可以更改UITabBar中特定UITabBarItem的背景颜色吗？

Can I change the background color of a specific UITabBarItem in a UITabBar?

我知道如何更改所选背景的所有背景，使用：

I know how to change all the background of the selected background, using:

[[UITabBar appearance] setBarTintColor:[UIColor redColor]];
[[UITabBar appearance] setTintColor:[UIColor blueColor]];
[[UITabBar appearance] setSelectedImageTintColor:[UIColor yellowColor]];

但是只能在没有子类化的情况下对一个项目进行吗？

But can it be done for only one item without subclassing?

谢谢

推荐答案

您可以将子视图添加到父tabBar，并在子视图上设置背景颜色。您可以使用tabBar框架尺寸来计算tabBarItem的偏移量和宽度，然后在下面插入子视图。

You can add a subview to the parent tabBar, and set a background color on the subview. You can use the tabBar frame dimensions to calculate the offset and width of your tabBarItem, and then insert the subview underneath.

示例（在Swift中）：

Example (in Swift):

// Add background color to middle tabBarItem
let itemIndex = 2
let bgColor = UIColor(red: 0.08, green: 0.726, blue: 0.702, alpha: 1.0)

let itemWidth = tabBar.frame.width / CGFloat(tabBar.items!.count)
let bgView = UIView(frame: CGRectMake(itemWidth * itemIndex, 0, itemWidth, tabBar.frame.height))
bgView.backgroundColor = bgColor
tabBar.insertSubview(bgView, atIndex: 0)

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