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unwindSegue 实现界面跳转

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传统的界面跳转方法：

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//ThirdViewController
@IBAction func pop(_ sender: Any) {
	navigationController?.popViewController(animated: true)
}
	
@IBAction func popToRoot(_ sender: Any) {
	navigationController?.popToRootViewController(animated: true)
}
//ForthViewController
@IBAction func dismiss(_ sender: Any) {
	dismiss(animated: true, completion: nil)
}



使用unwindSegue实现界面跳转：

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//RedViewController
@IBAction func unwindToRed(sender: UIStoryboardSegue){
	if sender.identifier == "FromGreenToRed" {
		print("from green")
	} else if sender.identifier == "FromYellowToRed" {
		print("from yellow")
	}
}
//GreenViewController
@IBAction func unwindToGreen(sender: UIStoryboardSegue){
    
}
//YellowViewController
@IBAction func unwindToYellow(sender: UIStoryboardSegue){
    
}