设置tabBar的背景图片，选中文字颜色

// 被废弃了 会有警告
self.tabBar.selectedImageTintColor = [UIColororangeColor];

// 最新的使用方法
NSMutableDictionary *textAttrs = [NSMutableDictionarydictionary];
textAttrs[NSForegroundColorAttributeName] =HWColor(123,123, 123);

NSMutableDictionary *selectTextAttrs = [NSMutableDictionary dictionary];
selectTextAttrs[NSForegroundColorAttributeName] = [UIColor orangeColor];

[childVc.tabBarItem setTitleTextAttributes:textAttrs forState:UIControlStateNormal];
[childVc.tabBarItemsetTitleTextAttributes:selectTextAttrs forState:UIControlStateSelected];

// - 设置选中的图片 图片不被渲染
childVc.tabBarItem.selectedImage = [[UIImageimageNamed:selectedImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];