当我尝试从我的TabBarController的第4个选项卡中以模式方式显示视图控制器时,该选项卡是嵌入在NavigationViewController中的TableViewController,它连续出现两次。
实际方法present(_:animated:completion:)
连续被调用两次,而实际应该只发生一次。
这就是我从UITableViewController
调用方法的方式。现在,因为我收到“正在尝试显示其视图不在窗口层次结构中的vc”警告,所以尝试了此替代方法,并且不再收到该警告,但是现在我遇到了这个问题。
((UIApplication.shared.keyWindow?.rootViewController as? MainTabBarViewController)?.selectedViewController as? NavigationPodesavanjaViewController)?.visibleViewController?.present(Egg, animated: true, completion: nil)
这是来自视图控制器的所有内容。就像现在的虚拟内容一样,带有后退按钮:
import UIKit
class EasterEggViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
view.backgroundColor = ConstantsClass.ljubicastaBoja
let imageView = UIImageView(image: UIImage(named: "operator-ikonica"))
view.addSubview(imageView)
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
imageView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
imageView.frame.size = CGSize(width: 250, height: 250)
let backButton = UIButton()
view.addSubview(backButton)
backButton.setTitle("Nazad", for: .normal)
backButton.titleLabel?.textColor = .white
backButton.frame = CGRect(x: 50, y: 50, width: 100, height: 20)
backButton.titleLabel?.adjustsFontSizeToFitWidth = true
backButton.addTarget(self, action: #selector(dismissAction), for: .touchUpInside)
}
@objc func dismissAction() {
dismiss(animated: true, completion: nil)
}
}
当前的方法在处理程序中被调用以长按手势。 //注意:当我长按以轻按时,它应能正常工作,当我将其改回时,它又再次出现了两次。
这是viewDidLoad代码的一部分:
let longPressEgg = UILongPressGestureRecognizer()
longPressEgg.addTarget(self, action: #selector(easterEggScreenPresent))
easterEgg.addGestureRecognizer(longPressEgg)
这是处理程序:
@objc func easterEggScreenPresent(){
let Egg = EasterEggViewController()
((UIApplication.shared.keyWindow?.rootViewController as? MainTabBarViewController)?.selectedViewController as? NavigationPodesavanjaViewController)?.visibleViewController?.present(Egg, animated: true, completion: nil)
}
答案 0 :(得分:1)
以不同的状态多次调用UILongPressGestureRecognizer
。在您的情况下,手势开始时应显示视图控制器。将您的easterEggScreenPresent
更改为以下内容:
@objc func easterEggScreenPresent(sender: UILongPressGestureRecognizer) {
guard sender.state == .began else { return }
let egg = EasterEggViewController()
((UIApplication.shared.keyWindow?.rootViewController as? MainTabBarViewController)?.selectedViewController as? NavigationPodesavanjaViewController)?.visibleViewController?.present(egg, animated: true, completion: nil)
}