Block
1.typealias ScenderBlock = (_ backString: String) -> Void
2.var block:ScenderBlock?
3.self.block?(textField1.text!)
4.在传值界面
vc.block = { backString in
self.lab.text = backString
}
Delegate
1.
@objc protocol scenderDelegate:NSObjectProtocol{
func backTextFieldValue(_ textString:String)
}
2.weak var delegate:scenderDelegate?
3.
if self.delegate != nil && (self.delegate?.responds(to: #selector(ScenderDelegate.backTextFieldValue(_:))))!{
self.delegate?.backTextFieldValue(textField2.text!)
}
4.在回传的界面中a.添加ScenderDelegate b. vc.delegate = self
c.
func backTextFieldValue(_ textString: String) {
self.lab.text = textString
}
全部代码-----------------------------------------------
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class ViewController: UIViewController,ScenderDelegate {
@IBOutlet weak var lab: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func presentClick(_ sender: Any) {
let vc:scenderVC = self.storyboard?.instantiateViewController(withIdentifier: "scenderID") as! scenderVC
vc.block = { backString in
self.lab.text = backString
}
vc.delegate = self
self.present(vc, animated: true, completion: nil)
}
func backTextFieldValue(_ textString: String) {
self.lab.text = textString
}
}
import UIKit
typealias ScenderBlock = (_ backString: String) -> Void
@objc protocol ScenderDelegate:NSObjectProtocol{
@objc func backTextFieldValue(_ textString:String)
}
class scenderVC: UIViewController {
@IBOutlet weak var textField1: UITextField!
@IBOutlet weak var textField2: UITextField!
var block:ScenderBlock?
weak var delegate:ScenderDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func blockClick(_ sender: UIButton) {
self.block?(textField1.text!)
self.dismiss(animated: true, completion: nil)
}
@IBAction func delegateClick(_ sender: Any) {
if self.delegate != nil && (self.delegate?.responds(to: #selector(ScenderDelegate.backTextFieldValue(_:))))!{
self.delegate?.backTextFieldValue(textField2.text!)
}
self.dismiss(animated: true, completion: nil)
}
}