本文介绍了Swift中未调用协议委托方法的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
未调用协议委托方法.
First View控制器代码
class ViewController: UIViewController,customDelegate {
var seconviewcontroller : SecondViewController = SecondViewController()
@IBOutlet weak var Label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
seconviewcontroller.delegate = self
}
func didSelectData(_ result: String) {
Label.text = result
print("Didselect Data Call")
}
第二视图控制器代码
import UIKit
protocol customDelegate: class {
func didSelectData(_ result: String)
}
class SecondViewController: UIViewController {
var delegate: customDelegate?
@IBOutlet weak var secondbutton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func secondbuttonclick(_ sender: Any) {
let selectedItem = "naga"
delegate?.didSelectData(selectedItem)
}
如何调用fund didSelectData请帮助我
how to call the func didSelectData pls help me
推荐答案
因此,基本上var seconviewcontroller : SecondViewController = SecondViewController()
行与推送视图控制器实例不同.
So basically in line var seconviewcontroller : SecondViewController = SecondViewController()
is different from your pushing view controller instance.
您要创建SecondViewController
的单独实例,因此在使用类似pushs的对象进行推送时已经完成了委托自我
You are making a separate instance of SecondViewController
so you have done delegate self at the time of pushing with pushes object like that
let secondVCInstance = self.storyboard?.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController
secondVCInstance.delegate = self
self.navigationController?.pushViewController(secondVCInstance, animated: true)
注意:-每个对象都有其自己的属性
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