如何从UIViewController扩展的任何类中以编程方式创建选项卡：
class DashboardTabBarController: UITabBarController {
override func viewDidLoad() {
//here
}
...
}
更新SWIFT 3
以编程方式创建UITabBarController的一个例子可能是这样的：
首先我们创建一个UIViewControllers,它将是标签栏界面的每个选项卡的内容.对于这个例子,我们只创建一个很简单.
class Item1ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.green
self.title = "item1"
print("item 1 loaded")
}
}
现在,UITabBarController：
我们创建我们要在标签栏中显示的UIViewControllers的新实例.然后我们为每个我们创建的实例创建一个图标,然后我们创建一个数组,其中包含所有UIViewControllers,它们为选项卡栏界面的每个选项卡指定内容.数组中视图控制器的顺序对应于选项卡栏中的显示顺序.
class DashboardTabBarController: UITabBarController,UITabBarControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
delegate = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let item1 = Item1ViewController()
let icon1 = UITabBarItem(title: "Title",image: UIImage(named: "someImage.png"),selectedImage: UIImage(named: "otherImage.png"))
item1.tabBarItem = icon1
let controllers = [item1] //array of the root view controllers displayed by the tab bar interface
self.viewControllers = controllers
}
//Delegate methods
func tabBarController(_ tabBarController: UITabBarController,shouldSelect viewController: UIViewController) -> Bool {
print("Should select viewController: \(viewController.title) ?")
return true;
}
}
