在iOS开发中,可以通过以下方法同时关闭两个模态视图控制器:
```swift
protocol SecondViewControllerDelegate: class {
func dismissSecondViewController()
}
class SecondViewController: UIViewController {
weak var delegate: SecondViewControllerDelegate?
// ...
}
```
```swift
delegate?.dismissSecondViewController()
```
```swift
class FirstViewController: UIViewController, SecondViewControllerDelegate {
// ...
func dismissSecondViewController() {
dismiss(animated: true, completion: nil) // 关闭第二个模态视图控制器
dismiss(animated: true, completion: nil) // 关闭第一个模态视图控制器
}
}
```
```swift
NotificationCenter.default.post(name: NSNotification.Name("DismissModalViewControllers"), object: nil)
```
```swift
class FirstViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(dismissModalViewControllers), name: NSNotification.Name("DismissModalViewControllers"), object: nil)
}
@objc func dismissModalViewControllers() {
dismiss(animated: true, completion: nil) // 关闭第二个模态视图控制器
dismiss(animated: true, completion: nil) // 关闭第一个模态视图控制器
}
}
```
以上是两种常用的方法来同时关闭两个模态视图控制器。在实际开发中,可以根据具体需求选择适合的方法来实现。
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