[英]Present a View Controller modally from a tab bar controller
I want to build a view with a camera.我想用相机构建一个视图。 Something just like Instagram where there is a button in the middle that the user can click and the camera view shows up.
就像 Instagram 一样,中间有一个按钮,用户可以点击它并显示相机视图。 I implemented a code for the
TabViewController
in the AppDelegate
but nothing happens, no animation or Presentation of the new ViewController
.我在
AppDelegate
为TabViewController
实现了一个代码,但没有任何反应,没有动画或新ViewController
演示。
Here is my AppDelegate:这是我的 AppDelegate:
import UIKit
class AppDelegate: UIResponder, UIApplicationDelegate, UITabBarControllerDelegate {
var window: UIWindow?
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: ViewController) -> Bool {
if viewController is ViewController {
let storyboard = UIStoryboard(name: "Main.storyboard", bundle: nil)
if let controller = storyboard.instantiateViewController(withIdentifier: "cameraVC") as? ViewController {
controller.modalPresentationStyle = .fullScreen
tabBarController.present(controller, animated: true, completion: nil)
}
return false
}
return true
}
Here is my Storyboard:这是我的故事板:
Any ideas?有什么想法吗?
I suggest to create a custom class for your TabBarController, then assign the delegate to that.我建议为您的 TabBarController 创建一个自定义类,然后将委托分配给它。
You can either assign and check the restorationIdentifier
of the view controller, or do a type check.您可以分配和检查视图控制器的
restorationIdentifier
,或者进行类型检查。 I usually use storyboard identifier as the restoration identifier of the view controller(s).我通常使用故事板标识符作为视图控制器的恢复标识符。
class TabBarController: UITabBarController, UITabBarControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
}
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
if let identifier = viewController.restorationIdentifier, identifier == "cameraVC" {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "cameraVC") as! CameraViewController
present(vc, animated: true, completion: nil)
return false
}
return true
}
}
Here's a sample you can play with: https://gist.github.com/emrekyv/3343aa40c24d7e54244dc09ba0cd95df这是您可以使用的示例: https : //gist.github.com/emrekyv/3343aa40c24d7e54244dc09ba0cd95df
I just tried and It worked perfectly for me:我刚刚尝试过,它对我来说非常有效:
Create a Custom class for your TabBarController and assign it to your Controller in Storyboard.为您的 TabBarController 创建一个自定义类,并将其分配给 Storyboard 中的控制器。
After that override didSelect of tabBarController and write your presentation code there :之后覆盖 tabBarController 的 didSelect 并在那里编写您的演示文稿代码:
override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
if let controller = self.viewControllers?[self.selectedIndex] as? ViewController {
controller.modalPresentationStyle = .fullScreen
self.present(controller, animated: true, completion: nil
}
}
Hope it helps!!希望有帮助!!
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