swift 去除 tabbarItem 的ImageView及文字的默认颜色
let items =self.tabBar.items
for item in items{
item.setTitleTextAttributes([NSForegroundColorAttributeName:UIColor.self_darkgreyColour()],
forState:UIControlState.Selected)
item.selectedImage= selectImgs[i]
item.image= imgs[i]
}
1.先获取tabBar的所有item ，然后遍历所有item，使用setTitleTextAttributes()方法设置文字颜色，UIControlState.Selected为选中时的颜色 ，也可以使用NSFontAttributeName：UIFont.systemFontOfSize(12.0)设置字体大小
2.去除图片的默认颜色：
let leftImage=UIImage(named:"homepage_icon")!.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
let leftButton =UIBarButtonItem(image: leftImage, style:UIBarButtonItemStyle.Done, target:self, action:"closeController")
self.navigationItem.leftBarButtonItem= letButton
