Swift 以编程方式创建segue对象
我创建了一个带有2个视图控制器的单视图应用程序。在第一个视图控制器中,我有一个标签和两个按钮,它们是通过编程创建的。从这些按钮到第二个视图控制器,我有两个分段。我希望每个按钮都能为第二视图控制器提供不同的信息。通过以编程方式创建这些按钮和分段,我无法将标识符分配给分段。因此,我不能使用Swift 以编程方式创建segue对象,swift,Swift,我创建了一个带有2个视图控制器的单视图应用程序。在第一个视图控制器中,我有一个标签和两个按钮,它们是通过编程创建的。从这些按钮到第二个视图控制器,我有两个分段。我希望每个按钮都能为第二视图控制器提供不同的信息。通过以编程方式创建这些按钮和分段,我无法将标识符分配给分段。因此,我不能使用performsgue(带有标识符:sender:)。 我该怎么做 第一个视图控制器: import UIKit class ViewController: UIViewController { var
performsgue(带有标识符:sender:)
。
我该怎么做
第一个视图控制器:
import UIKit
class ViewController: UIViewController {
var myLabel: UILabel!
var leftButton: UIButton!
var rightButton: UIButton!
// bellow are the 2 variable which I’d like to transport into the second ViewController
var leftButtonText = "I'm the left button."
var rightButtonText = "I'm the right button."
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let homeNavBar = UINavigationBar()
homeNavBar.frame = CGRect(x: 0, y: 0, width: 320, height: 45)
homeNavBar.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(homeNavBar)
let homeNavItem = UINavigationItem(title: "Home")
homeNavBar.setItems([homeNavItem], animated: false)
myLabel = UILabel()
myLabel.frame = CGRect(x: 165, y: 150, width: 200, height: 42)
myLabel.text = "Press one of the button bellow!"
self.view.addSubview(myLabel)
leftButton = UIButton(type: .custom)
leftButton.frame = CGRect(x: 80, y: 300, width: 70, height: 70)
leftButton.backgroundColor = UIColor.cyan
leftButton.setTitleColor(UIColor.black, for: .normal)
leftButton.setTitle("Left Button", for: .normal)
leftButton.layer.cornerRadius = 20
leftButton.layer.borderWidth = 1
leftButton.layer.masksToBounds = true
leftButton.addTarget(self, action: #selector(ViewController.leftButtonAction(_:)), for: .touchUpInside)
self.view.addSubview(leftButton)
rightButton = UIButton(type: .custom)
rightButton.frame = CGRect(x: 240, y: 300, width: 70, height: 70)
rightButton.backgroundColor = UIColor.cyan
rightButton.setTitleColor(UIColor.black, for: .normal)
rightButton.setTitle("Right button", for: .normal)
rightButton.layer.cornerRadius = 20
rightButton.layer.borderWidth = 1
rightButton.layer.masksToBounds = true
rightButton.addTarget(self, action: #selector(ViewController.rightButtonAction(_:)), for: .touchUpInside)
self.view.addSubview(rightButton)
let margins = self.view.layoutMarginsGuide
homeNavBar.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
homeNavBar.topAnchor.constraint(equalTo: margins.topAnchor).isActive = true
homeNavBar.trailingAnchor.constraint(equalTo: margins.trailingAnchor).isActive = true
myLabel.topAnchor.constraint(equalTo: homeNavBar.bottomAnchor).isActive = true
leftButton.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
leftButton.topAnchor.constraint(equalTo: myLabel.bottomAnchor).isActive = true
rightButton.topAnchor.constraint(equalTo: myLabel.bottomAnchor).isActive = true
rightButton.trailingAnchor.constraint(equalTo: margins.trailingAnchor).isActive = true
}
@objc func leftButtonAction (_ sender: UIButton) {
let segueSecondViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "idSecond")
self.show(segueSecondViewController, sender: nil)
print("I'm activated by the left button.")
}
@objc func rightButtonAction (_ sender: UIButton) {
let segueSecondViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "idSecond")
self.show(segueSecondViewController, sender: nil)
print("I'm activated by the right button.")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
import UIKit
class SecondViewController: UIViewController {
var mySecondLabel: UILabel!
var mySecondLabelText = "I'm the second page."
var closeButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let secondNavBar = UINavigationBar()
secondNavBar.frame.size = CGSize(width: 320, height: 45)
secondNavBar.translatesAutoresizingMaskIntoConstraints = false
let secondNavItem = UINavigationItem(title: "Second page")
secondNavBar.setItems([secondNavItem], animated: false)
self.view.addSubview(secondNavBar)
mySecondLabel = UILabel()
mySecondLabel.frame = CGRect(x: 165, y: 200, width: 200, height: 42)
mySecondLabel.backgroundColor = UIColor.yellow
mySecondLabel.textColor = UIColor.black
mySecondLabel.text = "\(mySecondLabelText)"
mySecondLabel.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(mySecondLabel)
closeButton = UIButton(type: .custom)
closeButton.frame = CGRect(x: 10, y: 50, width: 50, height: 50)
closeButton.backgroundColor = UIColor.red
closeButton.setTitleColor(UIColor.black, for: .normal)
closeButton.setTitle("Close", for: .normal)
closeButton.layer.cornerRadius = 30
closeButton.layer.borderWidth = 1
closeButton.layer.masksToBounds = true
closeButton.addTarget(self, action: #selector(SecondViewController.closeButtonAction(_:)), for: .touchUpInside)
self.view.addSubview(closeButton)
let margins = self.view.layoutMarginsGuide
secondNavBar.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
secondNavBar.topAnchor.constraint(equalTo: margins.topAnchor).isActive = true
secondNavBar.trailingAnchor.constraint(equalTo: margins.trailingAnchor).isActive = true
closeButton.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
closeButton.topAnchor.constraint(equalTo: secondNavBar.bottomAnchor).isActive = true
mySecondLabel.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
mySecondLabel.topAnchor.constraint(equalTo: closeButton.bottomAnchor).isActive = true
mySecondLabel.trailingAnchor.constraint(equalTo: margins.trailingAnchor).isActive = true
}
@objc func closeButtonAction (_ sender: UIButton) {
self.dismiss(animated: true, completion: nil)
print("Second page closed.")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
第二视图控制器:
import UIKit
class ViewController: UIViewController {
var myLabel: UILabel!
var leftButton: UIButton!
var rightButton: UIButton!
// bellow are the 2 variable which I’d like to transport into the second ViewController
var leftButtonText = "I'm the left button."
var rightButtonText = "I'm the right button."
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let homeNavBar = UINavigationBar()
homeNavBar.frame = CGRect(x: 0, y: 0, width: 320, height: 45)
homeNavBar.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(homeNavBar)
let homeNavItem = UINavigationItem(title: "Home")
homeNavBar.setItems([homeNavItem], animated: false)
myLabel = UILabel()
myLabel.frame = CGRect(x: 165, y: 150, width: 200, height: 42)
myLabel.text = "Press one of the button bellow!"
self.view.addSubview(myLabel)
leftButton = UIButton(type: .custom)
leftButton.frame = CGRect(x: 80, y: 300, width: 70, height: 70)
leftButton.backgroundColor = UIColor.cyan
leftButton.setTitleColor(UIColor.black, for: .normal)
leftButton.setTitle("Left Button", for: .normal)
leftButton.layer.cornerRadius = 20
leftButton.layer.borderWidth = 1
leftButton.layer.masksToBounds = true
leftButton.addTarget(self, action: #selector(ViewController.leftButtonAction(_:)), for: .touchUpInside)
self.view.addSubview(leftButton)
rightButton = UIButton(type: .custom)
rightButton.frame = CGRect(x: 240, y: 300, width: 70, height: 70)
rightButton.backgroundColor = UIColor.cyan
rightButton.setTitleColor(UIColor.black, for: .normal)
rightButton.setTitle("Right button", for: .normal)
rightButton.layer.cornerRadius = 20
rightButton.layer.borderWidth = 1
rightButton.layer.masksToBounds = true
rightButton.addTarget(self, action: #selector(ViewController.rightButtonAction(_:)), for: .touchUpInside)
self.view.addSubview(rightButton)
let margins = self.view.layoutMarginsGuide
homeNavBar.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
homeNavBar.topAnchor.constraint(equalTo: margins.topAnchor).isActive = true
homeNavBar.trailingAnchor.constraint(equalTo: margins.trailingAnchor).isActive = true
myLabel.topAnchor.constraint(equalTo: homeNavBar.bottomAnchor).isActive = true
leftButton.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
leftButton.topAnchor.constraint(equalTo: myLabel.bottomAnchor).isActive = true
rightButton.topAnchor.constraint(equalTo: myLabel.bottomAnchor).isActive = true
rightButton.trailingAnchor.constraint(equalTo: margins.trailingAnchor).isActive = true
}
@objc func leftButtonAction (_ sender: UIButton) {
let segueSecondViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "idSecond")
self.show(segueSecondViewController, sender: nil)
print("I'm activated by the left button.")
}
@objc func rightButtonAction (_ sender: UIButton) {
let segueSecondViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "idSecond")
self.show(segueSecondViewController, sender: nil)
print("I'm activated by the right button.")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
import UIKit
class SecondViewController: UIViewController {
var mySecondLabel: UILabel!
var mySecondLabelText = "I'm the second page."
var closeButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let secondNavBar = UINavigationBar()
secondNavBar.frame.size = CGSize(width: 320, height: 45)
secondNavBar.translatesAutoresizingMaskIntoConstraints = false
let secondNavItem = UINavigationItem(title: "Second page")
secondNavBar.setItems([secondNavItem], animated: false)
self.view.addSubview(secondNavBar)
mySecondLabel = UILabel()
mySecondLabel.frame = CGRect(x: 165, y: 200, width: 200, height: 42)
mySecondLabel.backgroundColor = UIColor.yellow
mySecondLabel.textColor = UIColor.black
mySecondLabel.text = "\(mySecondLabelText)"
mySecondLabel.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(mySecondLabel)
closeButton = UIButton(type: .custom)
closeButton.frame = CGRect(x: 10, y: 50, width: 50, height: 50)
closeButton.backgroundColor = UIColor.red
closeButton.setTitleColor(UIColor.black, for: .normal)
closeButton.setTitle("Close", for: .normal)
closeButton.layer.cornerRadius = 30
closeButton.layer.borderWidth = 1
closeButton.layer.masksToBounds = true
closeButton.addTarget(self, action: #selector(SecondViewController.closeButtonAction(_:)), for: .touchUpInside)
self.view.addSubview(closeButton)
let margins = self.view.layoutMarginsGuide
secondNavBar.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
secondNavBar.topAnchor.constraint(equalTo: margins.topAnchor).isActive = true
secondNavBar.trailingAnchor.constraint(equalTo: margins.trailingAnchor).isActive = true
closeButton.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
closeButton.topAnchor.constraint(equalTo: secondNavBar.bottomAnchor).isActive = true
mySecondLabel.leadingAnchor.constraint(equalTo: margins.leadingAnchor).isActive = true
mySecondLabel.topAnchor.constraint(equalTo: closeButton.bottomAnchor).isActive = true
mySecondLabel.trailingAnchor.constraint(equalTo: margins.trailingAnchor).isActive = true
}
@objc func closeButtonAction (_ sender: UIButton) {
self.dismiss(animated: true, completion: nil)
print("Second page closed.")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
您可以通过为视图控制器提供一个标识符来实现这一点。这不是一个序列,但它将实例化您的目标VC:
let vc = UIStoryboard(name:"Main", bundle:nil).instantiateViewControllerWithIdentifier("identifier") as! SecondViewController
self.navigationController?.pushViewController(vc, animated:true)
您可以在情节提要的Identity Inspector选项卡上设置VC标识符
我刚刚在文档中读到,如果故事板中没有带标识符的segue,则不能调用performsgue方法,因此请编写您的需求,您不能以编程方式执行
标识符标识触发序列的字符串。在里面
在接口生成器中,您可以在
属性检查器
如果两个ViewController都在故事板中,请参见:此方法可以,但我有两个按钮是通过编程创建的。所以,我不能用它。我想使用2个UIStoryboardSegue对象。您可以将其与多个segue一起使用。只要根据需要拖出尽可能多的按钮,并为每个按钮提供自己的标识符。好吧,但如果发生这种情况,我不知道我的ViewController中会有多少个按钮?为什么每个按钮都需要自己的序列?segue真正定义了目标视图控制器及其显示方式。多个按钮可以呈现相同的序列,您可以使用
发送者
来区分行为。每个按钮都会将自己作为发送者发送,并且prepareFor(segue:sender:)
可以使用按钮的标记来设置不同的目的地。